Articles | Volume 22, issue 3
22 Mar 2022
Research article | 22 Mar 2022
The Cambodian Mekong floodplain under future development plans and climate change
Alexander J. Horton et al.
No articles found.
Chinchu Mohan, Tom Gleeson, James S. Famiglietti, Vili Virkki, Matti Kummu, Miina Porkka, Lan Wang-Erlandsson, Xander Huggins, Dieter Gerten, and Sonja C. Jähnig
Hydrol. Earth Syst. Sci. Discuss.,
Preprint under review for HESSShort summary
The relationship between environmental flow violations and freshwater biodiversity at a large scale is not well explored. This study intends to carry out an exploratory evaluation of this relationship at a large scale. While our results thus suggest that streamflow and EF may not be the only determinants of freshwater biodiversity at large scales, they do not preclude the existence of relationships at smaller scales or with more holistic EF methods or with other biodiversity data or metrics.
Christopher R. Hackney, Grigorios Vasilopoulos, Sokchhay Heng, Vasudha Darbari, Samuel Walker, and Daniel R. Parsons
Earth Surf. Dynam., 9, 1323–1334,Short summary
Unsustainable sand mining poses a threat to the stability of river channels. We use satellite imagery to estimate volumes of material removed from the Mekong River, Cambodia, over the period 2016–2020. We demonstrate that current rates of extraction now exceed previous estimates for the entire Mekong Basin and significantly exceed the volume of sand naturally transported by the river. Our work highlights the importance of satellite imagery in monitoring sand mining activity over large areas.
Marko Kallio, Joseph H. A. Guillaume, Vili Virkki, Matti Kummu, and Kirsi Virrantaus
Geosci. Model Dev., 14, 5155–5181,Short summary
Different runoff and streamflow products are freely available but may come with unsuitable spatial units. On the other hand, starting a new modelling exercise may require considerable resources. Hydrostreamer improves the usability of existing runoff products, allowing runoff and streamflow estimates at the desired spatial units with minimal data requirements and intuitive workflow. The case study shows that Hydrostreamer performs well compared to benchmark products and observation data.
Vili Virkki, Elina Alanärä, Miina Porkka, Lauri Ahopelto, Tom Gleeson, Chinchu Mohan, Lan Wang-Erlandsson, Martina Flörke, Dieter Gerten, Simon N. Gosling, Naota Hanasaki, Hannes Müller Schmied, and Matti Kummu
Hydrol. Earth Syst. Sci. Discuss.,
Revised manuscript accepted for HESSShort summary
Direct and indirect of human actions have altered streamflow across the world since the pre-industrial time. Here, we introduce a novel method of Environmental Flow Envelopes (EFEs); this is an envelope of safe discharge variability within which riverine ecosystems are not seriously compromised. By assessing the violations of the EFE, we comprehensively quantify the frequency, severity, and trends of flow alteration during the past decades, illustrating anthropogenic effects on streamflow.
Matias Heino, Joseph H. A. Guillaume, Christoph Müller, Toshichika Iizumi, and Matti Kummu
Earth Syst. Dynam., 11, 113–128,Short summary
In this study, we analyse the impacts of three major climate oscillations on global crop production. Our results show that maize, rice, soybean, and wheat yields are influenced by climate oscillations to a wide extent and in several important crop-producing regions. We observe larger impacts if crops are rainfed or fully fertilized, while irrigation tends to mitigate the impacts. These results can potentially help to increase the resilience of the global food system to climate-related shocks.
Nguyen Van Khanh Triet, Nguyen Viet Dung, Bruno Merz, and Heiko Apel
Nat. Hazards Earth Syst. Sci., 18, 2859–2876,Short summary
In this study we provide an estimation of flood damages and risks to rice cultivation in the Mekong Delta. The derived modelling concept explicitly takes plant phenomenology and timing of floods in a probabilistic modelling framework into account. This results in spatially explicit flood risk maps to rice cultivation, quantified as expected annual damage. Furthermore, the changes in flood risk of two land-use scenarios were estimated and discussed.
Hafsa Ahmed Munia, Joseph H. A. Guillaume, Naho Mirumachi, Yoshihide Wada, and Matti Kummu
Hydrol. Earth Syst. Sci., 22, 2795–2809,Short summary
An analytical framework is developed drawing on ideas of regime shifts from resilience literature to understand the transition between cases where water scarcity is or is not experienced depending on whether water from upstream is or is not available. The analysis shows 386 million people dependent on upstream water to avoid possible stress and 306 million people dependent on upstream water to avoid possible shortage. This provides insights into implications for negotiations between sub-basins.
Dung Duc Tran, Gerardo van Halsema, Petra J. G. J. Hellegers, Long Phi Hoang, Tho Quang Tran, Matti Kummu, and Fulco Ludwig
Hydrol. Earth Syst. Sci., 22, 1875–1896,Short summary
We modeled hydrological changes under impacts of large-scale dike constructions for intensive rice production in the floodplain of the Vietnamese Mekong Delta. Four scenarios show a significant increase in peak water levels in the upstream rivers, but very few water level changes are found downstream. Water balance calculations show where the floodwater goes under four dike construction scenarios. Its impacts on the tidal areas need to be clarified in the future with a 3-D hydraulic model.
Nguyen Van Khanh Triet, Nguyen Viet Dung, Hideto Fujii, Matti Kummu, Bruno Merz, and Heiko Apel
Hydrol. Earth Syst. Sci., 21, 3991–4010,Short summary
In this study we provide a numerical quantification of changes in flood hazard in the Vietnamese Mekong Delta as a result of dyke development. Other important drivers to the alteration of delta flood hazard are also investigated, e.g. tidal level. The findings of our study are substantial valuable for the decision makers in Vietnam to develop holistic and harmonized floods and flood-related issues management plan for the whole delta.
Timo A. Räsänen, Ville Lindgren, Joseph H. A. Guillaume, Brendan M. Buckley, and Matti Kummu
Clim. Past, 12, 1889–1905,Short summary
El Niño-Southern Oscillation (ENSO) is linked to severe droughts and floods in mainland Southeast Asia. This research provides a more accurate and uniform picture of the spatio-temporal effects of ENSO on precipitation (1980–2013) and improves our understanding of long-term (1650–2004) ENSO teleconnection and its variability over the study area. The results reveal not only recognisable spatio-temporal patterns but also a high degree of variability and non-stationarity in the effects of ENSO.
Long Phi Hoang, Hannu Lauri, Matti Kummu, Jorma Koponen, Michelle T. H. van Vliet, Iwan Supit, Rik Leemans, Pavel Kabat, and Fulco Ludwig
Hydrol. Earth Syst. Sci., 20, 3027–3041,Short summary
We modelled hydrological changes under climate change in the Mekong River, focusing on extreme events. The scenario ensemble shows an intensification of the hydrological cycle under climate change. Annual river flow increases between 5 and 16 % depending on locations. Extreme high flows increase substantially in both magnitude and frequency, posing threats to flood safety in the basin. Extreme low-flow events are projected to reduce as a result of increased river flow during the dry season.
J. Jägermeyr, D. Gerten, J. Heinke, S. Schaphoff, M. Kummu, and W. Lucht
Hydrol. Earth Syst. Sci., 19, 3073–3091,Short summary
We present a process-based simulation of global irrigation systems for the world’s major crop types. This study advances the global quantification of irrigation systems while providing a framework for assessing potential future transitions in these systems, a prerequisite for refined simulation of crop yields under climate change. We reveal for many river basins the potential for sizeable water savings and related increases in water productivity through irrigation improvements.
S. Siebert, M. Kummu, M. Porkka, P. Döll, N. Ramankutty, and B. R. Scanlon
Hydrol. Earth Syst. Sci., 19, 1521–1545,Short summary
We developed the historical irrigation data set (HID) depicting the spatio-temporal development of the area equipped for irrigation (AEI) between 1900 and 2005 at 5arcmin resolution. The HID reflects very well the spatial patterns of irrigated land as shown on two historical maps for 1910 and 1960. Global AEI increased from 63 million ha (Mha) in 1900 to 111 Mha in 1950 and 306 Mha in 2005. Mean aridity on irrigated land increased and mean natural river discharge decreased from 1900 to 1950.
M. E. Arias, T. Piman, H. Lauri, T. A. Cochrane, and M. Kummu
Hydrol. Earth Syst. Sci., 18, 5303–5315,Short summary
Hydrological modeling and assessment tools were used to provide evidence of the expected hydrological alterations that hydropower development in the lower Mekong tributaries could bring to the Tonle Sap. The most significant alterations are in terms of water levels during the dry season and rates of water level rise/drop which are crucial for tree seed germination and fish migrations, and therefore major ecological disruptions are likely to follow.
M. Kummu, D. Gerten, J. Heinke, M. Konzmann, and O. Varis
Hydrol. Earth Syst. Sci., 18, 447–461,
P. J. Ward, S. Eisner, M. Flörke, M. D. Dettinger, and M. Kummu
Hydrol. Earth Syst. Sci., 18, 47–66,
T. A. Räsänen, C. Lehr, I. Mellin, P. J. Ward, and M. Kummu
Hydrol. Earth Syst. Sci., 17, 2069–2081,
M. Meybeck, M. Kummu, and H. H. Dürr
Hydrol. Earth Syst. Sci., 17, 1093–1111,
H. Lauri, H. de Moel, P. J. Ward, T. A. Räsänen, M. Keskinen, and M. Kummu
Hydrol. Earth Syst. Sci., 16, 4603–4619,
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Nat. Hazards Earth Syst. Sci., 22, 1845–1856,Short summary
The flood that hit Europe in July 2021, specifically the Eifel, Germany, was more than a lot of fast-flowing water. The heavy rain that fell during the 3 d before also caused the slope to fail, recruited tree trunks that clogged bridges, and routed debris across the landscape. Especially in the upper parts of the catchments the flood was able to gain momentum. Here, we discuss how different landscape elements interacted and highlight the challenges of holistic future flood anticipation.
Marjolein J. P. Mens, Gigi van Rhee, Femke Schasfoort, and Neeltje Kielen
Nat. Hazards Earth Syst. Sci., 22, 1763–1776,Short summary
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Anna Rita Scorzini, Benjamin Dewals, Daniela Rodriguez Castro, Pierre Archambeau, and Daniela Molinari
Nat. Hazards Earth Syst. Sci., 22, 1743–1761,Short summary
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Maria Pregnolato, Andrew O. Winter, Dakota Mascarenas, Andrew D. Sen, Paul Bates, and Michael R. Motley
Nat. Hazards Earth Syst. Sci., 22, 1559–1576,Short summary
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Lulu Liu, Jiangbo Gao, and Shaohong Wu
Nat. Hazards Earth Syst. Sci., 22, 1577–1590,Short summary
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Miguel Moreno-Gómez, Carolina Martínez-Salvador, Rudolf Liedl, Catalin Stefan, and Julia Pacheco
Nat. Hazards Earth Syst. Sci., 22, 1591–1608,Short summary
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Małgorzata Chmiel, Maxime Godano, Marco Piantini, Pierre Brigode, Florent Gimbert, Maarten Bakker, Françoise Courboulex, Jean-Paul Ampuero, Diane Rivet, Anthony Sladen, David Ambrois, and Margot Chapuis
Nat. Hazards Earth Syst. Sci., 22, 1541–1558,Short summary
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Weihua Zhu, Kai Liu, Ming Wang, Philip J. Ward, and Elco E. Koks
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Andrea Magnini, Michele Lombardi, Simone Persiano, Antonio Tirri, Francesco Lo Conti, and Attilio Castellarin
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Corinne Bowers, Katherine A. Serafin, and Jack Baker
Nat. Hazards Earth Syst. Sci., 22, 1371–1393,Short summary
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Yves Tramblay and Pere Quintana Seguí
Nat. Hazards Earth Syst. Sci., 22, 1325–1334,Short summary
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Maria Francesca Caruso and Marco Marani
Nat. Hazards Earth Syst. Sci., 22, 1109–1128,Short summary
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Shupeng Yue, Xiaodan Sheng, and Fengtian Yang
Nat. Hazards Earth Syst. Sci., 22, 995–1014,Short summary
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Eva Boisson, Bruno Wilhelm, Emmanuel Garnier, Alain Mélo, Sandrine Anquetin, and Isabelle Ruin
Nat. Hazards Earth Syst. Sci., 22, 831–847,Short summary
We present the database of Historical Impacts of Floods in the Arve Valley (HIFAVa). It reports flood occurrences and impacts (1850–2015) in a French Alpine catchment. Our results show an increasing occurrence of impacts from 1920 onwards, which is more likely related to indirect source effects and/or increasing exposure rather than hydrological changes. The analysis reveals that small mountain streams caused more impacts (67 %) than the main river.
Francisco Peña, Fernando Nardi, Assefa Melesse, Jayantha Obeysekera, Fabio Castelli, René M. Price, Todd Crowl, and Noemi Gonzalez-Ramirez
Nat. Hazards Earth Syst. Sci., 22, 775–793,Short summary
Groundwater-induced flooding, a rare phenomenon that is increasing in low-elevation coastal cities due to higher water tables, is often neglected in flood risk mapping due to its sporadic frequency and considerably lower severity with respect to other flood hazards. A loosely coupled flood model is used to simulate the interplay between surface and subsurface flooding mechanisms simultaneously. This work opens new horizons on the development of compound flood models from a holistic perspective.
Qing Liu, Hanqing Xu, and Jun Wang
Nat. Hazards Earth Syst. Sci., 22, 665–675,Short summary
The coastal area is a major floodplain in compound flood events in coastal cities, primarily due to storm tide, with the inundation severity positively correlated with the height of the storm tide. Simply accumulating every single-driven flood hazard (rainstorm inundation and storm tide flooding) to define the compound flood hazard may cause underestimation. The assessment of tropical cyclone compound flood risk can provide vital insight for research on coastal flooding prevention.
Antonio-Juan Collados-Lara, Juan-de-Dios Gómez-Gómez, David Pulido-Velazquez, and Eulogio Pardo-Igúzquiza
Nat. Hazards Earth Syst. Sci., 22, 599–616,Short summary
This work studies the benefit of using more reliable local climate scenarios to analyse hydrological impacts. It has been applied in the Cenajo basin (south-eastern Spain), where we showed that the best approximations of the historical meteorology also provide the best approximations of the hydrology. The two selected climate models predict worrying changes in precipitation, temperature, streamflows and meteorological and hydrological droughts for the period 2071–2100 under the RCP8.5.
Agathe Bucherie, Micha Werner, Marc van den Homberg, and Simon Tembo
Nat. Hazards Earth Syst. Sci., 22, 461–480,Short summary
Local communities in northern Malawi have well-developed knowledge of the conditions leading to flash floods, spatially and temporally. Scientific analysis of catchment geomorphology and global reanalysis datasets corroborates this local knowledge, underlining the potential of these large-scale scientific datasets. Combining local knowledge with contemporary scientific datasets provides a common understanding of flash flood events, contributing to a more people-centred warning to flash floods.
Karen Gabriels, Patrick Willems, and Jos Van Orshoven
Nat. Hazards Earth Syst. Sci., 22, 395–410,Short summary
As land use influences hydrological processes (e.g., forests have a high water retention and infiltration capacity), it also impacts floods downstream in the river system. This paper demonstrates an approach quantifying the impact of land use changes on economic flood damages: damages in an initial situation are quantified and compared to damages of simulated floods associated with a land use change scenario. This approach can be used as an explorative tool in sustainable flood risk management.
Tao Liu, Luke A. McGuire, Nina Oakley, and Forest Cannon
Nat. Hazards Earth Syst. Sci., 22, 361–376,Short summary
A well-constrained rainfall-runoff model forced by radar-derived precipitation is used to define rainfall intensity-duration (ID) thresholds for flash floods. The rainfall ID doubles in 5 years after a severe wildfire in a watershed in southern California, USA. Rainfall ID performs stably well for intense pulses of rainfall over durations of 30-60 minutes that cover at least 15%-25% of the watershed. This finding could help issuing flash flood warnings based on radar-derived precipitation.
Annegret H. Thieken, Guilherme Samprogna Mohor, Heidi Kreibich, and Meike Müller
Nat. Hazards Earth Syst. Sci., 22, 165–185,Short summary
Various floods hit Germany recently. While there was a river flood with some dike breaches in 2013, flooding in 2016 resulted directly from heavy rainfall, causing overflowing drainage systems in urban areas and destructive flash floods in steep catchments. Based on survey data, we analysed how residents coped with these different floods. We observed significantly different flood impacts, warnings, behaviour and recovery, offering entry points for tailored risk communication and support.
Nat. Hazards Earth Syst. Sci., 22, 71–83,Short summary
This systematic review highlights flood mortality factors and the strategies to mitigate them, as obtained from 44 scientific articles published between 2010 and 2020. The findings are the classification of flood mortality drivers in two groups and the identification of strategies to cope with them. Future studies should fill the data gaps regarding flood fatalities in developing countries and information on people who have survived floods, which can be useful in educational campaigns.
Yuhan Yang, Jie Yin, Weiguo Zhang, Yan Zhang, Yi Lu, Yufan Liu, Aoyue Xiao, Yunxiao Wang, and Wenming Song
Nat. Hazards Earth Syst. Sci., 21, 3563–3572,Short summary
This is the first time the compound flooding process of heavy rain and levee-breach-induced flooding has been modeled. Real-life cases of historical flooding events have been adequately investigated. Our results provide a comprehensive view of the spatial patterns of the flood evolution, the dynamic process, and mechanism of these cases, which can help decision makers to develop effective emergency response plans and flood adaptation strategies.
Lucas Wouters, Anaïs Couasnon, Marleen C. de Ruiter, Marc J. C. van den Homberg, Aklilu Teklesadik, and Hans de Moel
Nat. Hazards Earth Syst. Sci., 21, 3199–3218,Short summary
This research introduces a novel approach to estimate flood damage in Malawi by applying a machine learning model to UAV imagery. We think that the development of such a model is an essential step to enable the swift allocation of resources for recovery by humanitarian decision-makers. By comparing this method (EUR 10 140) to a conventional land-use-based approach (EUR 15 782) for a specific flood event, recommendations are made for future assessments.
Haixia Zhang, Weihua Fang, Hua Zhang, and Lu Yu
Nat. Hazards Earth Syst. Sci., 21, 3161–3174,Short summary
Taking a single flood disaster in Lishui city as an example, a rapid and refined assessment of economic loss is studied and verified, which can effectively simulate the distribution of loss ratio and loss value. It includes the construction of land use type and value based on data fusion and an expert questionnaire survey, the fitting and calibration of vulnerability curves based on an existing database and disaster loss reporting, and estimation of loss ratio and loss value by spatial analysis.
Doris E. Wendt, John P. Bloomfield, Anne F. Van Loon, Margaret Garcia, Benedikt Heudorfer, Joshua Larsen, and David M. Hannah
Nat. Hazards Earth Syst. Sci., 21, 3113–3139,Short summary
Managing water demand and supply during droughts is complex, as highly pressured human–water systems can overuse water sources to maintain water supply. We evaluated the impact of drought policies on water resources using a socio-hydrological model. For a range of hydrogeological conditions, we found that integrated drought policies reduce baseflow and groundwater droughts most if extra surface water is imported, reducing the pressure on water resources during droughts.
Sara Lindersson, Luigia Brandimarte, Johanna Mård, and Giuliano Di Baldassarre
Nat. Hazards Earth Syst. Sci., 21, 2921–2948,Short summary
Riverine flood risk assessments require the identification of areas prone to potential flooding. We find that (topography-based) hydrogeomorphic floodplain maps can in many cases be useful for riverine flood risk assessments, particularly where hydrologic data are scarce. For 26 countries across the global south, we also demonstrate how dataset choice influences the estimated number of people living within flood-prone zones.
Mark V. Bernhofen, Mark A. Trigg, P. Andrew Sleigh, Christopher C. Sampson, and Andrew M. Smith
Nat. Hazards Earth Syst. Sci., 21, 2829–2847,Short summary
The use of different global datasets to calculate flood exposure can lead to differences in global flood exposure estimates. In this study, we use three global population datasets and a simple measure of a river’s flood susceptibility (based on the terrain alone) to explore how the choice of population data and the size of river represented in global flood models affect global and national flood exposure estimates.
Antonio Francipane, Dario Pumo, Marco Sinagra, Goffredo La Loggia, and Leonardo Valerio Noto
Nat. Hazards Earth Syst. Sci., 21, 2563–2580,Short summary
In the last few years, some cities in the Mediterranean area have witnessed an increase in extreme rainfall events such as urban floods. The study focuses on a particularly intense urban flood that occurred in Palermo on 15 July 2020, which highlighted the need for a shift in the way stormwater in urban settlements is managed. We think that the framework used to study the impacts of the event and some conclusive remarks could be easily transferred to other urban contexts.
Joseph T. D. Lucey and Timu W. Gallien
Nat. Hazards Earth Syst. Sci. Discuss.,
Revised manuscript accepted for NHESSShort summary
Compound coastal flooding results from multiple flood drivers (e.g., tides, waves, river flows, rainfall) occurring at the same time. Sea level rise will increase coastal flooding. This study estimates joint flood risks caused by large tides and rain. Results show, in dry regions where tides and rainfall are often separate events, wet season coinciding sampling better describes extreme flooding events. A new function based on the joint probabilities was then used to estimate sea wall impacts.
Luc Bonnafous and Upmanu Lall
Nat. Hazards Earth Syst. Sci., 21, 2277–2284,Short summary
Extreme climate events can cause human and economic catastrophe at the global scale. For specific sectors, such as humanitarian aid or insurance, being able to understand how (i.e., with which frequency and intensity) these events can occur simultaneously at different locations or several times in a given amount of time and hit critical assets is all-important to design contingency plans. Here we develop an indicator to study co-occurence in space and time of wet and dry extremes.
Colin Keating, Donghoon Lee, Juan Bazo, and Paul Block
Nat. Hazards Earth Syst. Sci., 21, 2215–2231,Short summary
Disaster planning has historically underallocated resources for flood preparedness, but evidence supports reduced vulnerability via early actions. We evaluate the ability of multiple season-ahead streamflow prediction models to appropriately trigger early actions for the flood-prone Marañón River and Piura River in Peru. Our findings suggest that locally tailored statistical models may offer improved performance compared to operational physically based global models in low-data environments.
Antonia Longobardi, Ouafik Boulariah, and Paolo Villani
Nat. Hazards Earth Syst. Sci., 21, 2181–2196,Short summary
The current research was aimed at the description of historical drought periods that have characterized a broad area of the Mediterranean Basin and the Campania region, located in southern Italy. Knowledge of the past conditions would increase the awareness of the communities with respect to the frequency and severity of critical conditions which have affected and might further affect the environment in which they live.
Henk-Jan van Alphen, Clemens Strehl, Fabian Vollmer, Eduard Interwies, Anasha Petersen, Stefan Görlitz, Luca Locatelli, Montse Martinez Puentes, Maria Guerrero Hidalga, Elias Giannakis, Teun Spek, Marc Scheibel, Erle Kristvik, Fernanda Rocha, and Emmy Bergsma
Nat. Hazards Earth Syst. Sci., 21, 2145–2161,Short summary
This paper presents an approach to selecting and analysing climate change adaptation measures, using a combination of scientific analysis and stakeholder interaction. This approach was applied in six cases across Europe, concerning drought and extreme precipitation. Although the cases vary widely, the approach yielded decision-relevant outcomes for the development of adaptation strategies, regarding socio-economic impacts of measures and potential barriers to implementation.
Robert P. Dziak, Bryan A. Black, Yong Wei, and Susan G. Merle
Nat. Hazards Earth Syst. Sci., 21, 1971–1982,Short summary
On 26 January 1700 CE, a massive earthquake and tsunami struck the US Pacific Northwest west coast. The tsunami caused severe damage to coastal forests in Washington State. However, evidence of the impact on coastal Oregon trees has been difficult to find. We present some of the first evidence of tree-ring growth changes caused by the 1700 tsunami from an old-growth Douglas-fir stand located in South Beach, Oregon. We also present a tsunami inundation model of the 1700 earthquake.
Tigstu T. Dullo, George K. Darkwah, Sudershan Gangrade, Mario Morales-Hernández, M. Bulbul Sharif, Alfred J. Kalyanapu, Shih-Chieh Kao, Sheikh Ghafoor, and Moetasim Ashfaq
Nat. Hazards Earth Syst. Sci., 21, 1739–1757,Short summary
We studied the effect of potential future climate change on floods, flood protection, and electricity infrastructure in the Conasauga River watershed in the US using ensemble hydrodynamic modeling. We used a GPU-accelerated Two-dimensional Runoff Inundation Toolkit for Operational Needs (TRITON) hydrodynamic model to simulate floods. Overall, this study demonstrates how a fast hydrodynamic model can enhance flood frequency maps and vulnerability assessment under changing climatic conditions.
Sengphrachanh Phakonkham, So Kazama, and Daisuke Komori
Nat. Hazards Earth Syst. Sci., 21, 1551–1567,Short summary
The main objective of this study was to propose a new approach to integrating hazard maps to detect hazardous areas on a national scale, for which area-limited data are available. The analytical hierarchy process (AHP) was used as a tool to combine the different hazard maps into an integrated hazard map. The results from integrated hazard maps can identify dangerous areas from both individual and integrated hazards.
Eklavyya Popat and Petra Döll
Nat. Hazards Earth Syst. Sci., 21, 1337–1354,Short summary
Two drought hazard indices are presented that combine drought deficit and anomaly aspects: one for soil moisture drought (SMDAI) where we simplified the DSI and the other for streamflow drought (QDAI), which is to our knowledge the first ever deficit anomaly drought index including surface water demand. Both indices are tested at the global scale with WaterGAP 2.2d outputs, providing more differentiated spatial and temporal patterns distinguishing the actual degree of respective drought hazard.
Xudong Zhou, Wenchao Ma, Wataru Echizenya, and Dai Yamazaki
Nat. Hazards Earth Syst. Sci., 21, 1071–1085,Short summary
This article assesses different uncertainties in the analysis of flood risk and found the runoff generated before the river routing is the primary uncertainty source. This calls for attention to be focused on selecting an appropriate runoff for the flood analysis. The uncertainties are reflected in the flood water depth, inundation area and the exposure of the population and economy to the floods.
Kees C. H. van Ginkel, Francesco Dottori, Lorenzo Alfieri, Luc Feyen, and Elco E. Koks
Nat. Hazards Earth Syst. Sci., 21, 1011–1027,Short summary
This study presents a state-of-the-art approach to assess flood damage for each unique road segment in Europe. We find a mean total flood risk of EUR 230 million per year for all individual road segments combined. We identify flood hotspots in the Alps, along the Sava River, and on the Scandinavian Peninsula. To achieve this, we propose a new set of damage curves for roads and challenge the community to validate and improve these. Analysis of network effects can be easily added to our analysis.
Gijs van Kempen, Karin van der Wiel, and Lieke Anna Melsen
Nat. Hazards Earth Syst. Sci., 21, 961–976,Short summary
In this study, we combine climate model results with a hydrological model to investigate uncertainties in flood and drought risk. With the climate model, 2000 years of
current climatewas created. The hydrological model consisted of several building blocks that we could adapt. In this way, we could investigate the effect of these hydrological building blocks on high- and low-flow risk in four different climate zones with return periods of up to 500 years.
Yair Rinat, Francesco Marra, Moshe Armon, Asher Metzger, Yoav Levi, Pavel Khain, Elyakom Vadislavsky, Marcelo Rosensaft, and Efrat Morin
Nat. Hazards Earth Syst. Sci., 21, 917–939,Short summary
Flash floods are among the most devastating and lethal natural hazards worldwide. The study of such events is important as flash floods are poorly understood and documented processes, especially in deserts. A small portion of the studied basin (1 %–20 %) experienced extreme rainfall intensities resulting in local flash floods of high magnitudes. Flash floods started and reached their peak within tens of minutes. Forecasts poorly predicted the flash floods mostly due to location inaccuracy.
Huijun Li, Lin Zhu, Gaoxuan Guo, Yan Zhang, Zhenxue Dai, Xiaojuan Li, Linzhen Chang, and Pietro Teatini
Nat. Hazards Earth Syst. Sci., 21, 823–835,Short summary
We propose a method that integrates fuzzy set theory and a weighted Bayesian model to evaluate the hazard probability of land subsidence based on Interferometric Synthetic Aperture Radar technology. The proposed model can represent the uncertainty and ambiguity in the evaluation process, and results can be compared to traditional qualitative methods.
William Mobley, Antonia Sebastian, Russell Blessing, Wesley E. Highfield, Laura Stearns, and Samuel D. Brody
Nat. Hazards Earth Syst. Sci., 21, 807–822,Short summary
In southeast Texas, flood impacts are exacerbated by increases in impervious surfaces, human inaction, outdated FEMA-defined floodplains and modeling assumptions, and changing environmental conditions. The current flood maps are inadequate indicators of flood risk, especially in urban areas. This study proposes a novel method to model flood hazard and impact in urban areas. Specifically, we used novel flood risk modeling techniques to produce annualized flood hazard maps.
Dan Wang, Paolo Scussolini, and Shiqiang Du
Nat. Hazards Earth Syst. Sci., 21, 743–755,Short summary
Flood protection level (FPL) is vital for risk analysis and management but scarce in realty particularly for developing countries. This paper develops a policy-based FPL dataset for China and validates it using local FPL designs. The FPLs are much higher than that in a global database, suggesting Chinese flood risk could be lower with the policy-required FPLs. Moreover, the FPLs are lower for western China and vulnerable people, implying a spatial and social divergence of the FPLs.
Jiyang Tian, Ronghua Liu, Liuqian Ding, Liang Guo, and Bingyu Zhang
Nat. Hazards Earth Syst. Sci., 21, 723–742,Short summary
A typhoon always comes with heavy rainfall which leads to great loss. The aim of this study is to explore the reasonable use of Doppler radar data assimilation to correct the initial and lateral boundary conditions of the numerical weather prediction (NWP) systems for typhoon rainstorm forecasts at catchment scale. The results show that assimilating radial velocity at a time interval of 1 h can significantly improve the rainfall simulations and outperform the other assimilation modes.
Oliver E. J. Wing, Andrew M. Smith, Michael L. Marston, Jeremy R. Porter, Mike F. Amodeo, Christopher C. Sampson, and Paul D. Bates
Nat. Hazards Earth Syst. Sci., 21, 559–575,Short summary
Global flood models are difficult to validate. They generally output theoretical flood events of a given probability rather than an observed event that they can be tested against. Here, we adapt a US-wide flood model to enable the rapid simulation of historical flood events in order to more robustly understand model biases. For 35 flood events, we highlight the challenges of model validation amidst observational data errors yet evidence the increasing skill of large-scale models.
Chunbo Jiang, Qi Zhou, Wangyang Yu, Chen Yang, and Binliang Lin
Nat. Hazards Earth Syst. Sci., 21, 497–515,Short summary
We proposed a new dynamic coupling model for flood simulation and prediction. The model can dynamically alter the coupling boundary position based on the characteristic theory to determine the non-inundation and inundation regions, taking into account both mass and momentum exchange. Then the model was validated by several classic numerical test cases as well as experiment data and implemented in a real study case. Results show its capability for flood simulation and risk assessments.
Carmelo Cammalleri, Carolina Arias-Muñoz, Paulo Barbosa, Alfred de Jager, Diego Magni, Dario Masante, Marco Mazzeschi, Niall McCormick, Gustavo Naumann, Jonathan Spinoni, and Jürgen Vogt
Nat. Hazards Earth Syst. Sci., 21, 481–495,Short summary
Building on almost ten years of expertise and operational application of the Combined Drought Indicator (CDI) for the monitoring of agricultural droughts in Europe within the European Commission's European Drought Observatory (EDO), this paper proposes a revised version of the index. This paper shows that the proposed revised CDI reliably reproduces the evolution of major droughts, outperforming the current version of the indicator, especially for long-lasting events.
Adamson, P. T., Rutherfurd, I. D., Peel, M. C., and Conlan, I. A.: The Hydrology of the Mekong River, chap. 4, edited by: Campbell, I. C., The Mekong Academic Press, San Diego, 53–76, 2009.
Arias, M. E., Cochrane, T. A., Piman, T., Kummu, M., Caruso, B. S., and Killeen, T. J.: Quantifying changes in flooding and habitats in the Tonle Sap Lake (Cambodia) caused by water infrastructure development and climate change in the Mekong Basin, Environ. Manage., 112, 53–66, https://doi.org/10.1016/j.jenvman.2012.07.003, 2012.
Arias, M. E., Cochrane, T. A., Kummu, M., Lauri, H., Holtgrieve, G. W., Koponen, J., and Piman, T.: Impacts of hydropower and climate change on drivers of ecological productivity of Southeast Asia's most important wetland, Ecol. Modell., 272, 252–263, https://doi.org/10.1016/j.ecolmodel.2013.10.015, 2014.
Benaman, J., Shoemaker, C. A., and Haith, D. A.: Calibration and Validation of Soil and Water Assessment Tool on an Agricultural Watershed in Upstate New York, J. Hydrol. Eng., 10, 363–374, https://doi.org/10.1061/(ASCE)1084-0699(2005)10:5(363), 2005.
Boretti, A.: Implications on food production of the changing water cycle in the Vietnamese Mekong Delta, Glob. Ecol. Conserv., 22, e00989, https://doi.org/10.1016/j.gecco.2020.e00989, 2020.
Chen, A., Liu, J., Kummu, M., Varis, O., Tang, Q., Mao, G., Wang, J., and Chen, D.: Multidecadal variability of the Tonle Sap Lake flood pulse regime, Hydrol. Process., 35, e14327, https://doi.org/10.1002/hyp.14327, 2021.
Dang, T. D., Cochrane, T. A., Arias, M. E., and Tri, V. P. D.: Future hydrological alterations in the Mekong Delta under the impact of water resources development, land subsidence and sea level rise, J. Hydrol. Reg. Stud. 15, 119–133, https://doi.org/10.1016/j.ejrh.2017.12.002, 2018.
Darby, S. E., Leyland, J., Kummu, M., Räsänen, T. A., and Lauri, H.: Decoding the drivers of bank erosion on the Mekong river: The roles of the Asian monsoon, tropical storms, and snowmelt, Water Resour. Res., 49, 2146–2163, https://doi.org/10.1002/wrcr.20205, 2013.
Donchyts, G., Schellekens, J., Winsemius, H., Eisemann, E., and Van de Giesen, N.: A 30 m Resolution Surface Water Mask Including Estimation of Positional and Thematic Differences Using Landsat 8, SRTM and OpenStreetMap: A Case Study in the Murray-Darling Basin, Australia, Remote Sens., 8, 386, https://doi.org/10.3390/rs8050386, 2016.
Duc Tran, D., van Halsema, G., Hellegers, P. J. G. J., Phi Hoang, L., Quang Tran, T., Kummu, M., and Ludwig, F.: Assessing impacts of dike construction on the flood dynamics of the Mekong Delta, Hydrol. Earth Syst. Sci., 22, 1875–1896, https://doi.org/10.5194/hess-22-1875-2018, 2018.
Dung, N. V., Merz, B., Bárdossy, A., Thang, T. D., and Apel, H.: Multi-objective automatic calibration of hydrodynamic models utilizing inundation maps and gauge data, Hydrol. Earth Syst. Sci., 15, 1339–1354, https://doi.org/10.5194/hess-15-1339-2011, 2011.
FAO, IIASA: Harmonized World Soil Database (version 1.1), Food and Agriculture Organization of United Nations (FAO), Rome, Italy and The international Institute for Applied Systems Analysis (IIASA) [data set], Laxenburg, Austria, https://webarchive.iiasa.ac.at/Research/LUC/External-World-soil-database/HTML/HWSD_Data.html?sb=4 (last access: 1 December 2011), 2009.
Fischer, G., Tubiello, F. N., van Velthuizen, H., and Wiberg, D. A.: Climate change impacts on irrigation water requirements: Effects of mitigation, 1990–2080, Technol. Forecast. Soc., 74, 1083–1107, https://doi.org/10.1016/j.techfore.2006.05.021, 2007.
Fujii, H., Garsdal, H., Ward, P., Ishii, M., Morishita, K., and Boivin, T.: Hydrological roles of the Cambodian floodplain of the Mekong River, Int. J. River Basin Manag., 1, 253–266, https://doi.org/10.1080/15715124.2003.9635211, 2003.
GLC2000: The Global Land Cover Map for the Year 2000, European Commision Joint Research Centre [data set], https://www.un-spider.org/links-and-resources/data-sources/land-cover-map-glc2000-jrc (last access: 1 December 2011), 2003.
Hackney, C. R., Darby, S. E., Parsons, D. R., Leyland, J., Best, J. L., Aalto, R., Nicholas, A. P., and Houseago, R. C.: River bank instability from unsustainable sand mining in the lower Mekong River, Nat. Sustain., 3, 217–225, https://doi.org/10.1038/s41893-019-0455-3, 2020.
Hoang, L. P., Lauri, H., Kummu, M., Koponen, J., van Vliet, M. T. H., Supit, I., Leemans, R., Kabat, P., and Ludwig, F.: Mekong River flow and hydrological extremes under climate change, Hydrol. Earth Syst. Sci., 20, 3027–3041, https://doi.org/10.5194/hess-20-3027-2016, 2016.
Hoang, L. P., van Vliet, M. T. H., Kummu, M., Lauri, H., Koponen, J., Supit, I., Leemans, R., Kabat, P., and Ludwig, F.: The Mekong's future flows under multiple drivers: How climate change, hydropower developments and irrigation expansions drive hydrological changes, Sci. Total Environ., 649, 601–609, https://doi.org/10.1016/j.scitotenv.2018.08.160, 2019.
Hoanh, C. T., Jirayoot, K., Lacombe, G., and Srinetr, V.: Impacts of climate change and development on Mekong flow regimes. First assessment-2009, MRC Technical Paper No. 29, International Water Management Institute and Mekong River Commission, Vientiane, Lao PDR, 2010.
Horton, A. J., Kummu, M., Triet, N. V. K., and Hoang, L. P.: Future water level, discharge, and flood maps under climate change and infrastructure impacts along the Cambodian Mekong, Zenodo [data set], https://doi.org/10.5281/zenodo.6341785, 2022.
IPCC: Climate Change 2014: Synthesis Report. Contribution of Working Groups I, II and III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change, edited by: core writing team, Pachauri, R. K. and Meyer, L. A., IPCC, Geneva, Switzerland, 151 pp., ISBN 978-92-9169-143-2, 2014.
Jarvis, A., Reuter, H. I., Nelson, A., and Guevara, E.: Hole-filled SRTM for the globe version 4: data grid, http://srtm.csi.cgiar.org/ (last access: February 2020), 2008.
Ji, X., Li, Y., Luo, X., and He, D.: Changes in the Lake Area of Tonle Sap: Possible Linkage to Runoff Alterations in the Lancang River?, Remote Sens., 10, 866, https://doi.org/10.3390/rs10060866, 2018.
Kallio, M. and Kummu, M.: Comment on “Changes of inundation area and water turbidity of Tonle Sap Lake: Responses to climate changes or upstream dam construction?”, Environ. Res. Lett., 16, 058001, https://doi.org/10.1088/1748-9326/abf3da, 2021.
Kazama, S., Hagiwara, T., Ranjan, P., and Sawamoto, M.: Evaluation of groundwater resources in wide inundation areas of the Mekong River basin, J. Hydrol., 340, 233–243, https://doi.org/10.1016/j.jhydrol.2007.04.017, 2007.
Kondolf, G. M., Schmitt, R. J. P., Carling, P., Darby, S., Arias, M., Bizzi, S., Castelletti, A., Cochrane, T. A., Gibson, S., Kummu, M., Oeurng, C., Rubin, Z., and Wild, T.: Changing sediment budget of the Mekong: Cumulative threats and management strategies for a large river basin, Sci. Total Environ., 625, 114–134, https://doi.org/10.1016/j.scitotenv.2017.11.361, 2018.
Kummu, M. and Sarkkula, J.: Impact of the Mekong River Flow Alteration on the Tonle Sap Flood Pulse, Ambio, 37, 185–192, https://doi.org/10.1579/0044-7447(2008)37[185:IOTMRF]2.0.CO;2, 2008.
Kummu, M., Lu, X. X., Wang, J. J., and Varis, O.: Basin-wide sediment trapping efficiency of emerging reservoirs along the Mekong, Geomorphology, 119, 181–197, https://doi.org/10.1016/j.geomorph.2010.03.018, 2010.
Lamberts, D.: Little impact, much damage: the consequences of Mekong River flow alterations for the Tonle Sap ecosystem, in: Modern Myths of the Mekong. A critical review of water and development concepts, principles and policies Water & Development Publications, edited by: Kummu, M., Keskinen, M., and Varis, O., Helsinki University of Technology, Helsinki, Finland, 3–18, ISBN 978-951-22-9102-1, 2008.
Lauri, H., Veijalainen, N., Kummu, M., Koponen, J., Virtanen, M., Inkala, A., and Sark, J.: VMod Hydrological Model Manual, Finnish Environment Institute, EIA Ltd., Helsinki University of Technology, 2006.
Lauri, H., de Moel, H., Ward, P. J., Räsänen, T. A., Keskinen, M., and Kummu, M.: Future changes in Mekong River hydrology: impact of climate change and reservoir operation on discharge, Hydrol. Earth Syst. Sci., 16, 4603–4619, https://doi.org/10.5194/hess-16-4603-2012, 2012.
Manh, N. V., Dung, N. V., Hung, N. N., Kummu, M., Merz, B., and Apel, H.: Future sediment dynamics in the Mekong Delta floodplains: Impacts of hydropower development, climate change and sea level rise, Global Planet. Change, 127, 22–33, https://doi.org/10.1016/j.gloplacha.2015.01.001, 2015.
May, R., Jinno, K., and Tsutsumi, A.: Influence of flooding on groundwater flow in central Cambodia, Environ. Earth Sci., 63, 151–161, https://doi.org/10.1007/s12665-010-0679-z, 2011.
Morris, G. L.: Sediment Management and Sustainable Use of Reservoirs, in: Modern Water Resources Engineering Humana Press, edited by: Wang, L. K. and Yang, C. T., Totowa, New Jersey, 279–337, https://doi.org/10.1007/978-1-62703-595-8_5, 2014.
MRC: Annual Mekong Flood Report 2010, Mekong River Commission, Vientiane, Lao PDR, 76 pp., ISSN 1728-3248, 2011.
MRC: THE COUNCIL STUDY: WUP-FIN IWRM Scenario Modelling Report, Mekong River Commission, Vientiane, Lao PDR, https://www.mrcmekong.org/assets/Publications/Council-Study/IWRM-scenario-modelling-report_Council-Study-SM.pdf (last accessed: 15 October 2021), 2018.
Piman, T., Cochrane, T., Arias, M., Green, A., and Dat, N.: Assessment of Flow Changes from Hydropower Development and Operations in Sekong, Sesan, and Srepok Rivers of the Mekong Basin, J. Water Res. Plan. Man., 139, 723–732, https://doi.org/10.1061/(ASCE)WR.1943-5452.0000286, 2013.
Pokhrel, Y., Shin, S., Lin, Z., Yamazaki, D., and Qi, J.: Potential Disruption of Flood Dynamics in the Lower Mekong River Basin Due to Upstream Flow Regulation, Sci. Rep.-UK, 8, 17767, https://doi.org/10.1038/s41598-018-35823-4, 2018.
Portmann, F. T., Siebert, S., and Döll, P.: MIRCA2000-Global monthly irrigated and rainfed crop areas around the year 2000: A new high-resolution data set for agricultural and hydrological modeling, Global Biogeochem. Cy., 24, GB1011, https://doi.org/10.1029/2008GB003435, 2010.
Räsänen, T. A., Koponen, J., Lauri, H., and Kummu, M.: Downstream Hydrological Impacts of Hydropower Development in the Upper Mekong Basin, Water Resour. Manag., 26, 3495–3513, https://doi.org/10.1007/s11269-012-0087-0, 2012.
Räsänen, T. A., Someth, P., Lauri, H., Koponen, J., Sarkkula, J., and Kummu, M.: Observed river discharge changes due to hydropower operations in the Upper Mekong Basin, J. Hydrol., 545, 28–41, https://doi.org/10.1016/j.jhydrol.2016.12.023, 2017.
Rennó, C. D., Nobre, A. D., Cuartas, L. A., Soares, J. V., Hodnett, M. G., Tomasella, J., and Waterloo, M. J.: HAND, a new terrain descriptor using SRTM-DEM: Mapping terra-firme rainforest environments in Amazonia, Remote Sens. Environ., 112, 3469–3481, https://doi.org/10.1016/j.rse.2008.03.018, 2008.
Schmitt, R. J. P., Rubin, Z., and Kondolf, G. M.: Losing ground – scenarios of land loss as consequence of shifting sediment budgets in the Mekong Delta, Geomorphology, 294, 58–69, https://doi.org/10.1016/j.geomorph.2017.04.029, 2017.
Schmitt, R. J. P., Bizzi, S., Castelletti, A., and Kondolf, G. M.: Improved trade-offs of hydropower and sand connectivity by strategic dam planning in the Mekong, Nat. Sustain., 1, 96–104, https://doi.org/10.1038/s41893-018-0022-3, 2018.
Setegn, S. G., Dargahi, B., Srinivasan, R., and Melesse, A. M.: Modeling of Sediment Yield From Anjeni-Gauged Watershed, Ethiopia Using SWAT Model, J. Am. Water Resour. As., 46, 514–526, https://doi.org/10.1111/j.1752-1688.2010.00431.x, 2010.
Soukhaphon, A., Baird, I. G., and Hogan, Z. S.: The Impacts of Hydropower Dams in the Mekong River Basin: A Review, Water, 13, 265, https://doi.org/10.3390/w13030265, 2021.
Triet, N. V. K., Dung, N. V., Fujii, H., Kummu, M., Merz, B., and Apel, H.: Has dyke development in the Vietnamese Mekong Delta shifted flood hazard downstream?, Hydrol. Earth Syst. Sci., 21, 3991–4010, https://doi.org/10.5194/hess-21-3991-2017, 2017.
Triet, N. V. K., Dung, N. V., Hoang, L. P., Duy, N. L., Tran, D. D., Anh, T. T., Kummu, M., Merz, B., and Apel, H.: Future projections of flood dynamics in the Vietnamese Mekong Delta, Sci. Total Environ., 742, 140596, https://doi.org/10.1016/j.scitotenv.2020.140596, 2020.
Try, S., Tanaka, S., Tanaka, K., Sayama, T., Lee, G., and Oeurng, C.: Assessing the effects of climate change on flood inundation in the lower Mekong Basin using high-resolution AGCM outputs, Prog. Earth Planet. Sci., 7, 34, https://doi.org/10.1186/s40645-020-00353-z, 2020a.
Try, S., Tanaka, S., Tanaka, K., Sayama, T., Oeurng, C., Uk, S., Takara, K., Hu, M., and Han, D.: Comparison of gridded precipitation datasets for rainfall-runoff and inundation modeling in the Mekong River Basin, PLoS One, 15, e0226814, https://doi.org/10.1371/journal.pone.0226814, 2020b.
Västilä, K., Kummu, M., Sangmanee, C., and Chinvanno, S.: Modelling climate change impacts on the flood pulse in the Lower Mekong floodplains, J. Water Clim. Change, 1, 67–86, https://doi.org/10.2166/wcc.2010.008, 2010.
Xu, H.: Modification of normalised difference water index (NDWI) to enhance open water features in remotely sensed imagery, Int. J. Remote Sens., 27, 3025–3033, https://doi.org/10.1080/01431160600589179, 2006.
Yu, W., Kim, Y., Lee, D., and Lee, G.: Hydrological assessment of basin development scenarios: Impacts on the Tonle Sap Lake in Cambodia, Quatern. Int., 503, 115–127, https://doi.org/10.1016/j.quaint.2018.09.023, 2019.
Ziv, G., Baran, E., Nam, S., Rodríguez-Iturbe, I., and Levin, S. A.: Trading-off fish biodiversity, food security, and hydropower in the Mekong River Basin, P. Natl. Acad. Sci. USA, 109, 5609–5614, https://doi.org/10.1073/pnas.1201423109, 2012.
We studied the cumulative impact of future development and climate change scenarios on discharge and floods in the Cambodian Mekong floodplain. We found that hydropower impacts dominate, acting in opposition to climate change impacts to drastically increase dry season flows and reduce wet season flows even when considering the higher RCP8.5 level. The consequent reduction in flood extent and duration may reduce regional flood risk but may also have negative impacts on floodplain productivity.
We studied the cumulative impact of future development and climate change scenarios on discharge...