Abstract:
Land use change is a very important issue considering global dynamics and their response to hydrologic
characteristics of soil and water management in a catchment. A significant land use change has been observed in
the Tekeze dam catchment. The main objective of this study was to estimate the potential impacts of the land
use land cover (LULC) dynamics on hydrological response (streamflow and sediment yield). This was done by
integrating SWAT model with GIS. The simulation and sensitivity analysis for each land use was done by
dividing the catchment in to 47 sub-catchments and assigning HRUs based on multiple HRU definition. After a
sensitivity analysis, calibration and validation of SWAT model, the impact of LULC dynamics on hydrological
response were evaluated with three scenarios (climate of 2000s & 2008 LULC, climate of 2000s & 1986 LULC
and climate of 1980s & 1986 LULC). In the Tekeze dam watershed, land cover change had a beneficial impact
on modeled watershed response due to the transition from grass and shrub land to agricultural land. Simulation
results for the Tekeze dam watershed indicates that increasing bare land and agricultural areas resulted in
increased annual and seasonal stream flow and sediment yield in volumes. The mean annual streamflow was
increased by 6.02% (129.20–137.74 m
3
/s) and the impact on sediment yield amounts to an increase of 17.39%
(12.54–15.18 t/ha/yr) due to LULC dynamics. The hydrological response was more sensitive to LULC dynamics
for the months of August to October than others in the year. These results demonstrate the usefulness of
integrating remote sensing and distributed hydrologic models through the use of GIS for assessing watershed
conditions and the relative impacts of land cover transitions on hydrologic response in a continuous manner
