Propagation from meteorological to hydrological drought in the Horn of Africa using both standardized and threshold-based indices

Odongo, Rhoda A.; De Moel, Hans; Van Loon, Anne F.

doi:https://doi.org/10.5194/nhess-23-2365-2023

Articles | Volume 23, issue 6

https://doi.org/10.5194/nhess-23-2365-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/nhess-23-2365-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 23, issue 6

Research article

|

28 Jun 2023

Research article |

| 28 Jun 2023

Propagation from meteorological to hydrological drought in the Horn of Africa using both standardized and threshold-based indices

Rhoda A. Odongo, Hans De Moel, and Anne F. Van Loon

Supplement

https://doi.org/10.5194/nhess-23-2365-2023-supplement

Data sets

River discharge and related forecasted data from the Global Flood Awareness System Copernicus Climate Change Service (C3S) https://doi.org/10.24381/cds.ff1aef77

Copernicus Global Land Service: Land Cover 100m: collection 3: epoch 2019: Globe (V3.0.1) M. Buchhorn, B. Smets, L. Bertels, B. De Roo, M. Lesiv, N. E. Tsendbazar, M. Herold, and S. Fritz https://doi.org/10.5281/zenodo.3939050

Africa Groundwater Atlas British Geological Survey https://www2.bgs.ac.uk/africagroundwateratlas/downloadGIS.html

Model code and software

Rhoda91/Propagation-of-drought: On Propagation of Drought in the Horn of Africa (Version 1) Rhoda A. Odongo https://doi.org/10.5281/zenodo.8086057

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Short summary

We characterize meteorological (P), soil moisture (SM) and hydrological (Q) droughts and the propagation from one to the other for 318 catchments in the Horn of Africa. We find that propagation from P to SM is influenced by soil properties and vegetation, while propagation from P to Q is from catchment-scale hydrogeological properties (i.e. geology, slope). We provide precipitation accumulation periods at the subbasin level that can be used as a proxy in drought forecasting in dryland regions.