Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 3.102
IF3.102
IF 5-year value: 3.284
IF 5-year
3.284
CiteScore value: 5.1
CiteScore
5.1
SNIP value: 1.37
SNIP1.37
IPP value: 3.21
IPP3.21
SJR value: 1.005
SJR1.005
Scimago H <br class='widget-line-break'>index value: 90
Scimago H
index
90
h5-index value: 42
h5-index42
Preprints
https://doi.org/10.5194/nhess-2020-360
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2020-360
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  14 Nov 2020

14 Nov 2020

Review status
This preprint is currently under review for the journal NHESS.

Tropical drought risk: estimates combining gridded vulnerability and hazard data

Alexandra Nauditt1, Kerstin Stahl2, Erasmo Rodríguez3, Christian Birkel4, Rosa Maria Formiga-Johnsson5, Kallio Marko6, Hamish Hann1, Lars Ribbe1, Oscar M. Baez-Villanueva1,7, and Joschka Thurner1 Alexandra Nauditt et al.
  • 1Institute for Technology and Resources Management in the Tropics and Subtropics, Cologne Technical University of Applied Sciences, Germany
  • 2Chair of Environmental Hydrological Systems, University of Freiburg, Germany
  • 3Civil and Agricultural Engineering Department, Universidad Nacional de Colombia – Bogotá, Colombia
  • 4Department of Geography, University of Costa Rica
  • 5Department of Environmental and Sanitary Engineering, State University of Rio de Janeiro (UERJ), Brazil
  • 6Department of Built Environment, Aalto University, Finland
  • 7Faculty of Spatial Planning, TU Dortmund, Germany

Abstract. Droughts are causing severe damages to water abundant tropical countries worldwide. Their resilience to water shortages tends to be low, often due to a lack of water infrastructure. Moreover, drought characteristics and risk in tropical catchments are poorly understood, which makes it difficult to select adequate adaptation measures. Thus, reliable methodologies to evaluate spatially distributed drought risk in data scarce tropical catchments are urgently needed.

We combined drought hazard and vulnerability related information to assess drought risk in four rural tropical study regions, the Muriaé, subcatchment of the Paraíba do Sul in Southeast Brazil, the Tempisque-Bebedero in North Costa Rica, the upper part of the Magdalena basin, Colombia and the Srepok, a Mekong tributary shared by Cambodia and Vietnam. Drought hazard was defined based on three variables, daily river discharge and precipitation and vegetation condition. Conditions below defined thresholds were transformed into a cumulative drought index. To assess vulnerability, we reclassified and weighted globally and regionally available gridded socioeconomic data to represent the potential of a drought to cause damages in selected socioeconomic sectors of rural tropical regions. Besides illustrating the relative severity of each indicator value, we developed drought risk maps combining hazard and vulnerability severity for each grid cell.

While for the Muriaé our results clearly identified the downstream area as being exposed to severe drought risk, the Tempisque showed highest risk along the major streams and related irrigation systems. Risk hotspots in the Upper Magdalena were found in the central valley and the dryer Southeast and in the Srepok in the agricultural areas of Vietnam and downstream in Cambodia. Plausibility of results was confirmed by local scientists and stakeholders, who evaluated the results for each indicator and risk hotspot. The presented risk assessment methodology for data scarce and rural tropical areas offers a holistic, science based and innovative solution to provide relevant drought related information. Being applied to individual catchments, the findings described in this article will enable the selection of data sets, indices and their classification - depending on basin size, spatial resolution and seasonality. At its current stage, the outcomes of this study provide relevant information for regional planners and water managers dealing with the control of future drought disasters in tropical regions.

Alexandra Nauditt et al.

Interactive discussion

Status: open (until 26 Dec 2020)
Status: open (until 26 Dec 2020)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement

Alexandra Nauditt et al.

Alexandra Nauditt et al.

Viewed

Total article views: 180 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
141 38 1 180 10 1 0
  • HTML: 141
  • PDF: 38
  • XML: 1
  • Total: 180
  • Supplement: 10
  • BibTeX: 1
  • EndNote: 0
Views and downloads (calculated since 14 Nov 2020)
Cumulative views and downloads (calculated since 14 Nov 2020)

Viewed (geographical distribution)

Total article views: 170 (including HTML, PDF, and XML) Thereof 170 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 02 Dec 2020
Publications Copernicus
Download
Short summary
Recurrent droughts are causing severe damages to tropical countries. We used gridded drought hazard and vulnerability data sets to map drought risk in four mesoscale rural tropical study regions in Latin America and Vietnam/Cambodia. Our risk maps clearly identified drought risk hotspots and displayed spatial and sector-wise distribution of hazard and vulnerability. As results were confirmed by local stakeholders our approach provides relevant information for drought managers in the Tropics.
Recurrent droughts are causing severe damages to tropical countries. We used gridded drought...
Citation
Altmetrics