Articles | Volume 19, issue 11
Nat. Hazards Earth Syst. Sci., 19, 2635–2665, 2019
https://doi.org/10.5194/nhess-19-2635-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Nat. Hazards Earth Syst. Sci., 19, 2635–2665, 2019
https://doi.org/10.5194/nhess-19-2635-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article 25 Nov 2019
Research article | 25 Nov 2019
Meteorological conditions leading to the 2015 Salgar flash flood: lessons for vulnerable regions in tropical complex terrain
Carlos D. Hoyos et al.
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Nicolás Velásquez, Carlos D. Hoyos, Jaime I. Vélez, and Esneider Zapata
Hydrol. Earth Syst. Sci., 24, 1367–1392, https://doi.org/10.5194/hess-24-1367-2020, https://doi.org/10.5194/hess-24-1367-2020, 2020
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During 18 May 2015, a storm event produced a flash flood in the municipality of Salgar (northwestern Colombian Andes), resulting in more than 100 human casualties and significant economic losses. Here we present a modeled process reconstruction of what happened during this event. For this, we only use radar rainfall estimations and a digital elevation model. Results show that with scarce data there is an opportunity to obtain acceptable tools for risk management and decision making.
Andrés Esteban Bedoya-Velásquez, Gloria Titos, Juan Antonio Bravo-Aranda, Martial Haeffelin, Olivier Favez, Jean-Eudes Petit, Juan Andrés Casquero-Vera, Francisco José Olmo-Reyes, Elena Montilla-Rosero, Carlos D. Hoyos, Lucas Alados-Arboledas, and Juan Luis Guerrero-Rascado
Atmos. Chem. Phys., 19, 7883–7896, https://doi.org/10.5194/acp-19-7883-2019, https://doi.org/10.5194/acp-19-7883-2019, 2019
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This study is related to the first time hygroscopic enhancement factors retrieved directly for ambient aerosols using remote sensing techniques are combined with online chemical composition in situ measurements to evaluate the role of the different aerosol species in aerosol hygroscopicity at ACTRIS SIRTA observatory. The results showed 8 cases that fulfilled strict criteria over 107 cases identified in this study.
Andrés Esteban Bedoya-Velásquez, Francisco Navas-Guzmán, María José Granados-Muñoz, Gloria Titos, Roberto Román, Juan Andrés Casquero-Vera, Pablo Ortiz-Amezcua, Jose Antonio Benavent-Oltra, Gregori de Arruda Moreira, Elena Montilla-Rosero, Carlos David Hoyos, Begoña Artiñano, Esther Coz, Francisco José Olmo-Reyes, Lucas Alados-Arboledas, and Juan Luis Guerrero-Rascado
Atmos. Chem. Phys., 18, 7001–7017, https://doi.org/10.5194/acp-18-7001-2018, https://doi.org/10.5194/acp-18-7001-2018, 2018
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This study focuses on the analysis of aerosol hygroscopic growth during the SLOPE I campaign combining active and passive remote sensors at ACTRIS Granada station and in situ instrumentation at a mountain station (Sierra Nevada station, SNS). The results showed good agreement on gamma parameters by using remote sensing with respect to those calculated using Mie theory at SNS, with relative differences lower than 9 % at 532 nm and 11 % at 355 nm.
Nicolás Velásquez, Carlos D. Hoyos, Jaime I. Vélez, and Esneider Zapata
Hydrol. Earth Syst. Sci., 24, 1367–1392, https://doi.org/10.5194/hess-24-1367-2020, https://doi.org/10.5194/hess-24-1367-2020, 2020
Short summary
Short summary
During 18 May 2015, a storm event produced a flash flood in the municipality of Salgar (northwestern Colombian Andes), resulting in more than 100 human casualties and significant economic losses. Here we present a modeled process reconstruction of what happened during this event. For this, we only use radar rainfall estimations and a digital elevation model. Results show that with scarce data there is an opportunity to obtain acceptable tools for risk management and decision making.
Andrés Esteban Bedoya-Velásquez, Gloria Titos, Juan Antonio Bravo-Aranda, Martial Haeffelin, Olivier Favez, Jean-Eudes Petit, Juan Andrés Casquero-Vera, Francisco José Olmo-Reyes, Elena Montilla-Rosero, Carlos D. Hoyos, Lucas Alados-Arboledas, and Juan Luis Guerrero-Rascado
Atmos. Chem. Phys., 19, 7883–7896, https://doi.org/10.5194/acp-19-7883-2019, https://doi.org/10.5194/acp-19-7883-2019, 2019
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This study is related to the first time hygroscopic enhancement factors retrieved directly for ambient aerosols using remote sensing techniques are combined with online chemical composition in situ measurements to evaluate the role of the different aerosol species in aerosol hygroscopicity at ACTRIS SIRTA observatory. The results showed 8 cases that fulfilled strict criteria over 107 cases identified in this study.
Andrés Esteban Bedoya-Velásquez, Francisco Navas-Guzmán, María José Granados-Muñoz, Gloria Titos, Roberto Román, Juan Andrés Casquero-Vera, Pablo Ortiz-Amezcua, Jose Antonio Benavent-Oltra, Gregori de Arruda Moreira, Elena Montilla-Rosero, Carlos David Hoyos, Begoña Artiñano, Esther Coz, Francisco José Olmo-Reyes, Lucas Alados-Arboledas, and Juan Luis Guerrero-Rascado
Atmos. Chem. Phys., 18, 7001–7017, https://doi.org/10.5194/acp-18-7001-2018, https://doi.org/10.5194/acp-18-7001-2018, 2018
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This study focuses on the analysis of aerosol hygroscopic growth during the SLOPE I campaign combining active and passive remote sensors at ACTRIS Granada station and in situ instrumentation at a mountain station (Sierra Nevada station, SNS). The results showed good agreement on gamma parameters by using remote sensing with respect to those calculated using Mie theory at SNS, with relative differences lower than 9 % at 532 nm and 11 % at 355 nm.
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Linda van Garderen, Frauke Feser, and Theodore G. Shepherd
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Shunya Koseki, Priscilla A. Mooney, William Cabos, Miguel Ángel Gaertner, Alba de la Vara, and Juan Jesus González-Alemán
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Alberto Caldas-Alvarez and Samiro Khodayar
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Joan Albert Lopez-Bustins, Laia Arbiol-Roca, Javier Martin-Vide, Antoni Barrera-Escoda, and Marc Prohom
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We considered the Western Mediterranean Oscillation index (WeMOi) to analyse the occurrence of extreme torrential episodes (≥ 200 mm in 24 h) over Catalonia (NE Iberia) during the 1951–2016 period. Principal results reveal the occurrence of 50 episodes, mainly in autumn, especially during the second 10 d period of October (11–20), coinciding with the most negative WeMOi values of the year. Seasonal changes in these episodes and in WeMOi values might be due to sea warming.
Leah Hayward, Malcolm Whitworth, Nick Pepin, and Steve Dorling
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Kees Nederhoff, Jasper Hoek, Tim Leijnse, Maarten van Ormondt, Sofia Caires, and Alessio Giardino
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Nat. Hazards Earth Syst. Sci., 20, 2243–2254, https://doi.org/10.5194/nhess-20-2243-2020, https://doi.org/10.5194/nhess-20-2243-2020, 2020
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In this study, we corrected Asian Precipitation Highly Resolved Observational Data Integration Towards Evaluation of Water Resources (APHRODITE) in the Yarlung Tsangpo–Brahmaputra River Basin using both linear and nonlinear methods, and their influences on resulting extreme precipitation indices were assessed. Results showed that all methods were able to correct mean precipitation, but their ability to correct wet-day frequency and coefficient of variation were markedly different.
Milica M. Pecelj, Milica Z. Lukić, Dejan J. Filipović, Branko M. Protić, and Uroš M. Bogdanović
Nat. Hazards Earth Syst. Sci., 20, 2021–2036, https://doi.org/10.5194/nhess-20-2021-2020, https://doi.org/10.5194/nhess-20-2021-2020, 2020
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The variation in UTCI heat stress grade was observed during heat waves over the past 20 years in order to identify patterns of biothermal heat stress conditions in Serbia.
Very strong heat stressdescribes an alarming biothermal state and has occurred frequently in the last 10 years. The findings indicate the UTCI14 h index
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Deanna Nash and Leila M. V. Carvalho
Nat. Hazards Earth Syst. Sci., 20, 1931–1940, https://doi.org/10.5194/nhess-20-1931-2020, https://doi.org/10.5194/nhess-20-1931-2020, 2020
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On 6 March 2019, during an atmospheric river (AR) event, over 8000 lightning flashes were recorded near southern California in under 24 h, resulting in a unique meteorological event for this region. This study examines the characteristics of this AR compared to previous landfalling ARs in Santa Barbara and explores how the conditions led to the formation of hail and enhanced electrification in a region that sees little to no lightning.
Kuo Li and Gyilbag Amatus
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In recent years, heat waves have become more frequent in the world, e.g., in Europe, Australia, China and the US, at huge detriment to human health and natural resources. Thus we establish an integrated index of heat waves and extreme-temperature days to provide unified standards for assessing heat waves and hot years. It provides a clear picture of the evolution and spatial distribution of heat waves and hot years in China.
Michael Kunz, Jan Wandel, Elody Fluck, Sven Baumstark, Susanna Mohr, and Sebastian Schemm
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Severe convective storms are major loss drivers across Europe. We reconstructed several thousand storm tracks from radar reflectivity over a 10-year period for parts of Europe. The tracks were additionally combined with hail reports, reanalysis data, and front detections based on ERA-Interim (ECMWF Reanalysis). It is found that frontal hailstorms on average produce larger hailstones and have longer tracks and that wind shear is important not only for the hail diameter but also for track length.
Anita Verpe Dyrrdal, Ketil Isaksen, Jens Kristian Steen Jacobsen, and Irene Brox Nilsen
Nat. Hazards Earth Syst. Sci., 20, 1847–1865, https://doi.org/10.5194/nhess-20-1847-2020, https://doi.org/10.5194/nhess-20-1847-2020, 2020
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We have studied changes in winter weather known to trigger road closures and isolation of small seaside communities in northern Norway. We find that snow amounts and heavy snowfall events have increased in the past, while future projections for 2040–2100 show a decrease in snow-related indices. Events of heavy water supply and zero crossings are expected to increase. Our results imply fewer dry-snow-related access disruptions in the future, while wet-snow avalanches and slushflows may increase.
Rogert Sorí, Marta Vázquez, Milica Stojanovic, Raquel Nieto, Margarida L. R. Liberato, and Luis Gimeno
Nat. Hazards Earth Syst. Sci., 20, 1805–1832, https://doi.org/10.5194/nhess-20-1805-2020, https://doi.org/10.5194/nhess-20-1805-2020, 2020
Emanuele Bevacqua, Michalis I. Vousdoukas, Theodore G. Shepherd, and Mathieu Vrac
Nat. Hazards Earth Syst. Sci., 20, 1765–1782, https://doi.org/10.5194/nhess-20-1765-2020, https://doi.org/10.5194/nhess-20-1765-2020, 2020
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Coastal compound flooding (CF), caused by interacting storm surges and high water runoff, is typically studied based on concurring storm surge extremes with either precipitation or river discharge extremes. Globally, these two approaches show similar CF spatial patterns, especially where the CF potential is the highest. Deviations between the two approaches increase with the catchment size. The precipitation-based analysis allows for considering
local-rainfall-driven CF and CF in small rivers.
Flavio Lopes Ribeiro, Mario Guevara, Alma Vázquez-Lule, Ana Paula Cunha, Marcelo Zeri, and Rodrigo Vargas
Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2020-185, https://doi.org/10.5194/nhess-2020-185, 2020
Revised manuscript accepted for NHESS
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The main objective of this paper was to analyze differences in soil moisture responses to drought for each biome of Brazil. For that, we used satellite data from the European Space Agency, from 2009 to 2015. We found an overall soil moisture decline of −0.5 %/year at the country level and identified the most vulnerable biomes of Brazil. This information is crucial to enhance the national drought early warning system, develop strategies for drought risk reduction and soil moisture conservation.
Genshen Fang, Lin Zhao, Shuyang Cao, Ledong Zhu, and Yaojun Ge
Nat. Hazards Earth Syst. Sci., 20, 1617–1637, https://doi.org/10.5194/nhess-20-1617-2020, https://doi.org/10.5194/nhess-20-1617-2020, 2020
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Coastal regions of China feature high population densities as well as flexible structures and are therefore vulnerable to tropical cyclone (TC) damage. A TC is a moving rotating storm with a small occurrence rate at a specific site. Wind anemometers are usually damaged during strong typhoon events, making the record of observed winds an unreliable predictor for design wind speed. This study uses the Monte Carlo simulation to investigate the typhoon wind hazards in coastal regions of China.
Elody Fluck, Michael Kunz, Peter Geissbuehler, and Stefan P. Ritz
Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2020-138, https://doi.org/10.5194/nhess-2020-138, 2020
Revised manuscript accepted for NHESS
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Severe convective storms (SCS) and related hail constitute a major atmospheric hazard in various parts of Europe. In our study we identified the regions the most affected by hail over a 10-year period (2005 to 2014) covering France, Germany, Belgium and Luxembourg. A cell-tracking algorithm was computed on remote-sensing data to enable the reconstruction of several thousands of SCS tracks. The location of hail hotspots will help to understand hail formation and improve hail forecasting.
Oriol Rodríguez, Joan Bech, Juan de Dios Soriano, Delia Gutiérrez, and Salvador Castán
Nat. Hazards Earth Syst. Sci., 20, 1513–1531, https://doi.org/10.5194/nhess-20-1513-2020, https://doi.org/10.5194/nhess-20-1513-2020, 2020
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Post-event damage assessment data are used to study the consequences of natural hazards, such as strong convective winds (i.e. tornadoes, downbursts). The information gathered during fieldwork can be used to characterize those events, which is necessary to build up and maintain robust and homogeneous databases of severe weather cases and high-impact weather events. Accordingly, a methodology to carry out damage surveys of strong-convective-wind events is presented in this article.
Christina Kagkara, Wolfram Wobrock, Céline Planche, and Andrea I. Flossmann
Nat. Hazards Earth Syst. Sci., 20, 1469–1483, https://doi.org/10.5194/nhess-20-1469-2020, https://doi.org/10.5194/nhess-20-1469-2020, 2020
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Over the Cévennes–Vivarais region in southern France, 5 h intensive rainfall covering an area of 1000 km2 with more than 50 mm rain accumulation was observed during IOP7a of HyMeX. This study evaluates the performance of a bin-resolved cloud model for simulating this heavy-precipitation event. The simulation results were compared with observations of rain accumulation, radar reflectivity, temporal and spatial evolution of precipitation, 5 min rain rates, and raindrop size distributions.
Diego Cerrai, Qing Yang, Xinyi Shen, Marika Koukoula, and Emmanouil N. Anagnostou
Nat. Hazards Earth Syst. Sci., 20, 1463–1468, https://doi.org/10.5194/nhess-20-1463-2020, https://doi.org/10.5194/nhess-20-1463-2020, 2020
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On 1 September 2019 Hurricane Dorian made landfall on Great Abaco, unleashing unprecedented destruction on the northern Bahamas. Dorian was characterized by extreme winds, extensive coastal flooding, and impressive precipitation. We studied the event through images acquired by the synthetic aperture radars (SARs) mounted on European Space Agency satellites to derive flooding maps showing the extent of the devastation. We found that the flooded area in the Bahamas was at least 3000 km2.
Nadia Fourrié, Mathieu Nuret, Pierre Brousseau, and Olivier Caumont
Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2020-153, https://doi.org/10.5194/nhess-2020-153, 2020
Revised manuscript accepted for NHESS
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Impact of assimilation of various observation data set on the forecasts is studied in a mesoscale weather model. The ground-based GNSS Zenithal Total Delay data set providing information on humidity has the largest impact on the analyses and the forecasts. Indeed it represents an evenly spread and frequent data set available at each analysis time over the model domain. Moreover, the reprocessing of these data also improves the forecast quality but this impact is not statistically significant.
Matteo Ponzano, Bruno Joly, Laurent Descamps, and Philippe Arbogast
Nat. Hazards Earth Syst. Sci., 20, 1369–1389, https://doi.org/10.5194/nhess-20-1369-2020, https://doi.org/10.5194/nhess-20-1369-2020, 2020
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We assess a methodology to evaluate and improve intense precipitation forecasting in the southeastern French region. This methodology is based on the use of a 30-year dataset of past forecasts which are analysed using a spatial verification approach. We found that precipitation forecasting is qualitatively driven by the deep-convection parametrization. Locally the model is able to reproduce the distribution of spatially integrated rainfall patterns of the most intense precipitation.
Christoph P. Gatzen, Andreas H. Fink, David M. Schultz, and Joaquim G. Pinto
Nat. Hazards Earth Syst. Sci., 20, 1335–1351, https://doi.org/10.5194/nhess-20-1335-2020, https://doi.org/10.5194/nhess-20-1335-2020, 2020
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Derechos are widespread, convectively induced severe wind events. A climatology of derechos in Germany is presented. It shows that derechos are not uncommon across the country. Two seasonal peaks indicate a comparable derecho risk in summer and winter. At the same time, we found two different derecho types, a warm- and a cold-season type. We present characteristics of both derecho types that can help forecasters to estimate the potential derecho threat in a given weather situation.
Kelvin S. Ng and Gregor C. Leckebusch
Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2020-74, https://doi.org/10.5194/nhess-2020-74, 2020
Revised manuscript accepted for NHESS
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Of severe tropical cyclones (TCs) lead to devastating losses. Nevertheless, to construct a robust risk assessment is difficult based on historical TC records only. This paper addresses this issue by introducing a computationally simple approach, using operational ensemble forecasts to build a physically consistent high-impact TC event set with data equivalent to more than 10 000 years of TC events. This method will be of high relevance for insurance and disaster risk reduction applications.
Marco Tedesco, Steven McAlpine, and Jeremy R. Porter
Nat. Hazards Earth Syst. Sci., 20, 907–920, https://doi.org/10.5194/nhess-20-907-2020, https://doi.org/10.5194/nhess-20-907-2020, 2020
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Quantifying the exposure of house property to extreme weather events is crucial to study their impact on economy. Here, we show that value of property exposed to Hurricane Florence in September 2018 was USD 52 billion vs. USD 10 billion that would have occurred at the beginning of the 19th century due to urban expansion that increased after 1950s and the increasing number of houses built near water, showing the importance of accounting for the distribution of new buildings in risk and exposure.
James M. Done, Ming Ge, Greg J. Holland, Ioana Dima-West, Samuel Phibbs, Geoffrey R. Saville, and Yuqing Wang
Nat. Hazards Earth Syst. Sci., 20, 567–580, https://doi.org/10.5194/nhess-20-567-2020, https://doi.org/10.5194/nhess-20-567-2020, 2020
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Assessing tropical cyclone (TC) wind risk is challenging due to a lack of historical TC wind data. This paper presents a novel approach to simulating landfalling TC winds anywhere on Earth. It captures local features such as high winds over coastal hills and lulls over rough terrain. A dataset of over 700 global historical wind footprints has been generated to provide new views of historical events. This dataset can be used to advance our understanding of overland TC wind risk.
Omar Roberto Valverde-Arias, Paloma Esteve, Ana María Tarquis, and Alberto Garrido
Nat. Hazards Earth Syst. Sci., 20, 345–362, https://doi.org/10.5194/nhess-20-345-2020, https://doi.org/10.5194/nhess-20-345-2020, 2020
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We designed an index-based insurance (IBI) for drought and flood in rice crops in Babahoyo (Ecuador). We assessed Babahoyo's soil, climatic and topographic variability, finding two homogeneous zones inside this area. We set differentiated insurance premiums according to the particular risk status of each zone. Results demonstrate that this IBI is an efficient risk transfer tool for policyholders. This insurance design could contribute to stabilizing farmers' incomes and rice production.
Marc Mandement and Olivier Caumont
Nat. Hazards Earth Syst. Sci., 20, 299–322, https://doi.org/10.5194/nhess-20-299-2020, https://doi.org/10.5194/nhess-20-299-2020, 2020
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The number of connected personal weather stations has dramatically increased in the last years. These weather stations produce a high number of data that need a thorough quality control to unleash their potential. A novel quality-control algorithm now allows us to take full advantage of these data and observe thunderstorms with fine-scale details that cannot be caught by standard networks. These results pave the way for tremendous advances in both understanding and forecasting thunderstorms.
Doug Richardson, Hayley J. Fowler, Christopher G. Kilsby, Robert Neal, and Rutger Dankers
Nat. Hazards Earth Syst. Sci., 20, 107–124, https://doi.org/10.5194/nhess-20-107-2020, https://doi.org/10.5194/nhess-20-107-2020, 2020
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Models are not particularly skilful at forecasting rainfall more than 15 d in advance. However, they are often better at predicting atmospheric variables such as mean sea-level pressure (MSLP). Comparing a range of models, we show that UK winter and autumn rainfall and drought prediction skill can be improved by utilising forecasts of MSLP-based weather patterns (WPs) and subsequently estimating rainfall using the historical WP–precipitation relationships.
Peter Stucki, Paul Froidevaux, Marcelo Zamuriano, Francesco Alessandro Isotta, Martina Messmer, and Andrey Martynov
Nat. Hazards Earth Syst. Sci., 20, 35–57, https://doi.org/10.5194/nhess-20-35-2020, https://doi.org/10.5194/nhess-20-35-2020, 2020
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In 1876, 1910, and 2005, Switzerland was impacted by extreme rainfall and floods. All events were linked to a Vb cyclone. We test a range of weather model setups (short spinup and standard physics are best) to understand the sensitivity of atmospheric dynamics. The simulated Vb cyclones are (not) well defined for 2005 and 1910 (1876). To reproduce the events, intense moisture flux from the right direction is needed. Storms that slightly deviate from an ideal path produce erroneous precipitation.
Maria Cortès, Marco Turco, Philip Ward, Josep A. Sánchez-Espigares, Lorenzo Alfieri, and Maria Carmen Llasat
Nat. Hazards Earth Syst. Sci., 19, 2855–2877, https://doi.org/10.5194/nhess-19-2855-2019, https://doi.org/10.5194/nhess-19-2855-2019, 2019
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The main objective of this paper is to estimate changes in the probability of damaging flood events with global warming of 1.5, 2 and 3 °C above pre-industrial levels and taking into account different socioeconomic scenarios in two western Mediterranean regions. The results show a general increase in the probability of a damaging event, with larger increments when higher warming is considered. Moreover, this increase is higher when both climate and population change are included.
Andreia F. S. Ribeiro, Ana Russo, Célia M. Gouveia, Patrícia Páscoa, and Carlos A. L. Pires
Nat. Hazards Earth Syst. Sci., 19, 2795–2809, https://doi.org/10.5194/nhess-19-2795-2019, https://doi.org/10.5194/nhess-19-2795-2019, 2019
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This work investigates the dependence between drought hazard and yield anomalies of rainfed cropping systems in the Iberian Peninsula using the copula theory. The applied methodology allows us to estimate the likelihood of wheat and barley loss under drought conditions, and a dependence among extreme values is suggested. From the decision-making point of view this study aims to contribute to the mitigation of drought-related crop failure.
Yoav Yair, Yifat Yair, Baruch Rubin, Ronit Confino-Cohen, Yosef Rosman, Eduardo Shachar, and Menachem Rottem
Nat. Hazards Earth Syst. Sci., 19, 2715–2725, https://doi.org/10.5194/nhess-19-2715-2019, https://doi.org/10.5194/nhess-19-2715-2019, 2019
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During severe thunderstorms, cold outflows can eject pollen and dust particles from the surface, releasing allergens and causing
thunderstorm asthmaepidemics in sensitive populations. We report the first case in Israel that occurred on 25 October 2015. The emergency room presentation records from three hospitals in central Israel showed a clear increase in patients with respiratory complaints immediately after the passage of a massive super-cell thunderstorm in the area.
Kees Nederhoff, Alessio Giardino, Maarten van Ormondt, and Deepak Vatvani
Nat. Hazards Earth Syst. Sci., 19, 2359–2370, https://doi.org/10.5194/nhess-19-2359-2019, https://doi.org/10.5194/nhess-19-2359-2019, 2019
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Tropical cyclone wind models are often used in engineering applications. However, these models lack the required accuracy when the size of the tropical cyclone is not known. In this paper, new relationships are derived to describe parameters affecting the size. These relationships are formulated using observed data and make it possible to estimate tropical cyclone size and to use this information in tropical cyclone wind models to obtain more reliable estimates of the tropical cyclone winds.
Yongqiang Liu, Lu Hao, Decheng Zhou, Cen Pan, Peilong Liu, Zhe Xiong, and Ge Sun
Nat. Hazards Earth Syst. Sci., 19, 2281–2294, https://doi.org/10.5194/nhess-19-2281-2019, https://doi.org/10.5194/nhess-19-2281-2019, 2019
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A transition zone often exists between a moist upper river reach and an arid lower reach in a watershed with complex topography. This zone is more suitable for human activities but is difficult to identify in climate classification. We found that a hydrological index overpowers a meteorological index in identifying a transition zone of a watershed in northwestern China, indicating the important role of the land-surface processes and human disturbances in formulating the transition zone.
William C. Arthur
Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2019-192, https://doi.org/10.5194/nhess-2019-192, 2019
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We have developed a statistical-parametric model of tropical cyclones (TCs), to undertake hazard and risk assessments at continental scales. The model enables users to build an understanding of the likelihood and magnitude of TC-related wind speeds across full ocean basins, but at a fine spatial resolution. The model can also be applied to single events, either scenarios or forecast events, to inform detailed impact assessments.
Stefano Federico, Rosa Claudia Torcasio, Elenio Avolio, Olivier Caumont, Mario Montopoli, Luca Baldini, Gianfranco Vulpiani, and Stefano Dietrich
Nat. Hazards Earth Syst. Sci., 19, 1839–1864, https://doi.org/10.5194/nhess-19-1839-2019, https://doi.org/10.5194/nhess-19-1839-2019, 2019
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This study shows the possibility to improve the weather forecast at the very short range (0–3 h) using lightning and/or radar reflectivity observations. We consider two challenging events that occurred over Italy, named Serrano and Livorno, characterized by moderate and exceptional rainfall, respectively.
The improvement given to the forecast by using the lightning and/or radar reflectivity observations is considerable. The best performance is obtained when using both data.
Pauline Rivoire, Yves Tramblay, Luc Neppel, Elke Hertig, and Sergio M. Vicente-Serrano
Nat. Hazards Earth Syst. Sci., 19, 1629–1638, https://doi.org/10.5194/nhess-19-1629-2019, https://doi.org/10.5194/nhess-19-1629-2019, 2019
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In order to define a dry period, a threshold for wet days is usually considered to account for measurement errors and evaporation. In the present study, we compare the threshold of 1 mm d−1, the most commonly used threshold, to a time-varying threshold describing evapotranspiration to compare how the risk of extreme dry spells is estimated with both thresholds. Results indicate that considering a fixed threshold can underestimate extreme dry spells during the extended summer.
Mien-Tze Kueh, Wen-Mei Chen, Yang-Fan Sheng, Simon C. Lin, Tso-Ren Wu, Eric Yen, Yu-Lin Tsai, and Chuan-Yao Lin
Nat. Hazards Earth Syst. Sci., 19, 1509–1539, https://doi.org/10.5194/nhess-19-1509-2019, https://doi.org/10.5194/nhess-19-1509-2019, 2019
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In this study, we show that both the model horizontal resolution and air–sea flux parameterization can exert a large influence on tropical cyclone intensity simulation but with different impacts on wind structures. We highlight the intensification and contraction of the TC eyewall in response to the reduction of grid spacing. We also suggest that a well-developed eyewall is more conducive to the positive effect of flux formulas on TC development.
Zbigniew W. Kundzewicz, Buda Su, Yanjun Wang, Guojie Wang, Guofu Wang, Jinlong Huang, and Tong Jiang
Nat. Hazards Earth Syst. Sci., 19, 1319–1328, https://doi.org/10.5194/nhess-19-1319-2019, https://doi.org/10.5194/nhess-19-1319-2019, 2019
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Considering flood risk composed of hazard, exposure, and vulnerability from global to local scales, this paper reviews and presents increasing observed flood losses and projections of flood hazard and losses. We acknowledge existence of multiple driving factors and of considerable uncertainty, in particular with regards to projections for the future. Finally, this paper analyses options for flood risk reduction from a global framework to regional and local scales.
Sorin Burcea, Roxana Cică, and Roxana Bojariu
Nat. Hazards Earth Syst. Sci., 19, 1305–1318, https://doi.org/10.5194/nhess-19-1305-2019, https://doi.org/10.5194/nhess-19-1305-2019, 2019
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The mapping of convective storms in the area of the transboundary Prut River basin was developed using a 15-year radar dataset (2003–2017). The analysis is based on data sampled in successive 6 min scans of the atmosphere, to detect and track the convective storms. The results highlighted a yearly, monthly, and daily variation of convective activity but also spatial distribution patterns. The study of atmospheric convection is important in assessing the risks associated with extreme weather.
Marina Peña-Gallardo, Sergio Martín Vicente-Serrano, Fernando Domínguez-Castro, and Santiago Beguería
Nat. Hazards Earth Syst. Sci., 19, 1215–1234, https://doi.org/10.5194/nhess-19-1215-2019, https://doi.org/10.5194/nhess-19-1215-2019, 2019
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Drought events are of great importance in most Mediterranean climate regions, and the impacts caused on rainfed crops are particularly evident. In this study the impacts of drought on two representative rainfed crops in Spain (wheat and barley) are assessed by testing various worldwide drought indices and two datasets at different spatial resolution.
Sergio M. Vicente-Serrano, Cesar Azorin-Molina, Marina Peña-Gallardo, Miquel Tomas-Burguera, Fernando Domínguez-Castro, Natalia Martín-Hernández, Santiago Beguería, Ahmed El Kenawy, Iván Noguera, and Mónica García
Nat. Hazards Earth Syst. Sci., 19, 1189–1213, https://doi.org/10.5194/nhess-19-1189-2019, https://doi.org/10.5194/nhess-19-1189-2019, 2019
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Drought is a major driver of vegetation activity in Spain. Here we used a high-resolution remote-sensing dataset spanning the period from 1981 to 2015 to assess the sensitivity of 23 vegetation types to drought across Spain. Results demonstrate that vegetation activity is controlled largely by the interannual variability of drought. Nevertheless, there are some considerable spatio-temporal variations, which can be linked to differences in land cover and aridity conditions.
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Short summary
On the morning of 18 May 2015, a flash flood in the La Liboriana river basin inundated the town of Salgar, killing more than 100 people. The ultimate goal of science, regarding risk management, is to be able to reduce the number of people affected by severe storms. Our goal is to identify the meteorological conditions that led to the flood, assess the characteristics of the rainfall events before the disaster, and identify lessons for vulnerable regions settled in complex terrains.
On the morning of 18 May 2015, a flash flood in the La Liboriana river basin inundated the town...
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