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- W2163598889 abstract "The topography based distributed rainfall-runoff model (TOPMODEL) has been applied to the Gilgel Abay Basin which is the biggest of the four main tributaries of the Lake Tana basin. The model is applied to simulate outflows from the catchment and to predict spatial and temporal soil moisture dynamics and variable source areas in space and time. Digital elevation models (DEMs) of grid cell sizes from 30m to 500m have been used to test the effect of DEM grid cell size variation in the derived topographic index and hydrologic simulations. The model is found to perform satisfactorily with Nash-Sutcliff efficiency (Nash and Sutcliffe, 1970) of 0.782 for the 90m resolution DEM. Grid size is found to affect the distribution of topographic index significantly averaging effects on lower values and by increasing mean values as the DEM resolution gets coarser. This effect on the topographic index is also found to propagate in the hydrologic simulations and model efficiency. For the range of DEM grid sizes used in this study (60m to 500m), model efficiency is found to degrade slightly (1.83%) when DEM grid cell size increases from 60m to 500m by using the same calibrated parameters. Internal model predictions, such as overland flow component of the total runoff, the percentage of predicted variable source areas, also have been shown to be affected significantly. Larger grid cell sizes have been found to exaggerate the overland flow component of the total runoff. When the DEM grid cell size increases from 60m to 500m, the percentage of overland flow component of the total runoff increases from 9% to 22.9%. Increase in grid size also has been shown to increase the percentage of predicted variable source areas. While DEM grid size is increased from 60m to 500m the percentage of variable source areas predicted to be fully saturated is found to increase from 5.77% to 27.33% s respectively at the peak flow rate." @default.
- W2163598889 created "2016-06-24" @default.
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- W2163598889 date "2008-01-01" @default.
- W2163598889 modified "2023-09-27" @default.
- W2163598889 title "Land surface representation for regional rainfall-runoff modelling, upper Blue Nile basin, Ethiopia" @default.
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