Abstract
The resolution of digital elevation model (DEM) has important effects on topographic parameters and accuracy of hydrological simulation. Taking Huangshui river basin as an example, the 11 kinds of DEM resolution data are used for studying relationships between DEM resolution and hydrological simulation by Soil and Water Assessment Tool (SWAT) based on ArcGIS9.2. The results show that watershed area, the longest channel, total channel length, river network density and slope show downward trend with DEM grid size increasing. The slope change significantly, the maximum slope and average slope drop by 107.76% and 30.56%, respectively. Keeping other parameters of SWAT unchanged, the results of hydrological simulation reveal that runoff change slightly, dropping by 2.05%, but sediment yield decrease significantly, reducing by 41.72% with DEM grid increasing from 10 m to 130m. The results provide the theoretical basis for selecting the appropriate DEM resolution data in the hydrological simulation.
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