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王茂沟是陕北绥德韭园沟中游左岸的一条支沟,流域面积5.97平方公里。主沟长3.75公里,沟底平均比降为2.7%,沟壑密度每平方公里4.31公里。地面坡度:0°～15°占8.6%;16°～25°占20.1%;26°～35°占40.9%;大于35°占30.4%。地块破碎,地貌复杂,在黄土丘陵沟壑区第一副区具有一定代表性。该流域地表黄土覆盖厚20～151米,下部为红土,再下为基岩。黄土层土质疏松。据观测,多年平均降水量513.13毫米,汛期占73.12%,且多以暴雨形式出现,一次暴雨产沙量往往为全年总产沙量的60%以上。土壤侵蚀以水蚀为主,多年均侵蚀模数为每平
Wang Maogou is a branch ditch on the left bank of the middle reaches of Jiuyuan Gully in Suide, northern Shaanxi, covering an area of 5.97 square kilometers. The main channel length 3.75 kilometers, the average ditch bottom 2.7%, gully density 4.31 kilometers per square kilometer. Ground slope: 0 ° ~ 15 ° accounted for 8.6%; 16 ° ~ 25 ° accounted for 20.1%; 26 ° ~ 35 ° accounted for 40.9%; greater than 35 ° accounted for 30.4%. Plot fragmentation, complex landscape, in the loess hilly and gully area has a certain representation of the first deputy district. The surface of the basin covers an area of 20-151 meters of loess, the lower part is laterite, then the bedrock. Loess soil loose. According to observation, the average annual precipitation is 513.13 millimeters, accounting for 73.12% of flood season, and most of them are in the form of heavy rain. The output of a heavy rainstorm is often above 60% of the total annual sediment yield. Soil erosion mainly water erosion, erosion modulus for many years for each level