Figure 6. Subdivisions of the Chenyulan River catchment area.
2.3.5.2 Slope
Studies have shown that natural factors such as climate, land cover pattern, topography, geology, and soil characteristics affect soil erosion (Vrieling, 2006; Shin, Park, Pierson, & Williams, 2019). This study incorporated the CN method, potential maximum retention, and SY to estimate the potential maximum erosion of the catchment area. This method considered climate, land cover pattern, geology, and soil characteristics but did not consider topography. Therefore, this study established the average slope of each subdivision based on the DEM to correct the model.