Abstract
Investigating the variation of landscape over geological scale is often limited by detailed hydrological information which is necessary for calculating fluvial erosion in hydrologic methods. Since stream power law can be applied without the need of detailed information of stream properties, it has been used in many studies to estimate the fluvial erosion. In order to understand whether the drainage area in stream power law is appropriate substitution of discharge, especially in and region, where the discharge is strongly influenced by the evaporation, we combine the stream power law with the GIS technologies to calculate the discharge and estimate the fluvial erosion degree of several different resolution DEMs. By means of studying the relationships between drainage area, mean slope and resolution of DEM we confirm that the mean slope decreases and the drainage area increases with the resolution of DEM decreasing, which has effect on the calculated discharge. The results of estimated fluvial erosion degree suggest that the fluvial erosion degree varies with the shifts of discharge. In conclusion, stream power law is an appropriate method for modeling fluvial erosion in our study area.
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