地形数据及因子对山地流域RUSLE-SEDD模型的影响研究OA

Selecting a typical mountainous watershed(Zhaojue River Basin),this study applied the RUSLE-SEDD model to calculate annual sediment transport from 1990 to 2022 under combined scenarios involving four DEM resolutions,two slope length(L)factor algorithms,and six slope length cutoff values.The accuracy var-iations between calculated values and measured values were compared,and PLS-SEM was employed to reveal the impact of terrain data and factors on model results.The results indicated that:the SFBUFL and GFBUCA algorithms were more suitable for DEM data with resolutions finer than 30 m and coarser than 60 m,respec-tively,with the SFBUFL algorithm showing a more pronounced response to changes in DEM resolution;in model calculations based on the SFBUFL algorithm,DEM resolution and slope length cutoff value jointly con-tributed 27％to the influenceon the interannual sediment transport variations;for mountainous watersheds,when using DEM data with resolutions better than 30 m,the slope length cutoff value is recommended to be se-lected within the range of 45～80 m based on actual terrain conditions.