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Starr, Mike; Alam, Syed Ashraful
Hydrological sciences journal, 04/2015, Volume: 60, Issue: 4Journal Article
The annual water balance for 39 grid cells covering the savannah woodland region of Sudan (10-16°N; 21-36°E) was determined and regional maps produced. Long-term (1961-1990) mean monthly climate data, National Forest Inventory data and Harmonized World Soil Database data for arenosols and vertisols, the two dominant soil types in the region, were used. Model validation was performed using daily data from a site in one of the grid cells and inter-annual (1961-1990) variation examined for another grid cell. Rainfall varied from 147 to 732 mm and only exceeded evapotranspiration for 18 of the grid cells, resulting in a small increase in soil moisture and runoff. Evapotranspiration accounted for, on average, 96% of rainfall and there was little difference between soil types. Drainage only occurred from AR soils and for four of the grid cells. Runoff varied from 0 to 89 mm for arenosols and from 0 to 109 mm for vertisols. The study provided useful insights into the spatial variability in water balance components across the region. Editor D. Koutsoyiannis; Associate editor D. Gerten
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