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川掌沟位于皇甫川流域的上游,属黄土丘陵沟壑区第一副区。这里自然条件恶劣,干旱严重,年均降雨量仅350～400mm,且70％以上多以暴雨形式集中在7～9月降落。该流域总面积147km~2,流域内地形破碎,沟壑密度达3.91km/km~2,沟壑面积,35.37km~2,占总面积的24.1％;沟道两岸坡度较陡,基岩、砒砂岩、红泥岩裸露,风化、冻融侵蚀严重,是皇甫川中粗砂的主要产区之一;梁峁斜坡多以黄土或沙化黄土覆盖,风蚀、水蚀剧烈,年平均侵蚀模数为1.9万t/km~2。
Chuanzhaogou is located in the upper reaches of the Huangfuchuan Basin, a loess hilly and gully district first deputy district. Here the natural conditions are poor, the drought is serious, the average annual rainfall is only 350 ~ 400mm, and more than 70% mostly take the form of rainstorm concentrated in July to September. The total area of the basin is 147km ~ 2. The topography of the basin is fragmented, the gully density is 3.91km / km ~ 2, the gully area is 35.37km ~ 2, accounting for 24.1% of the total area; , Red mudstone exposed, weathering, severe freeze-thaw erosion is one of the main producing areas of the Huangfuchuan gritstone. Most of the Liangtao slope is covered by loess or sandy loess, with severe wind erosion and water erosion. The annual average erosion modulus is 19,000 t / km ~ 2.