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我站从1981年开始,在河曲县南曲沟下游布设了径流测验场,进行常规测验研究。三年来,取得一定的资料。 测验布设 径流场包括两条小流域,五个坡面径流区。流域测施手段采取纵向对比和横向对比相结合的方法,即沙咀沟流域为对照区,流域面积0.085平公方里,主沟道长414米,流域平均坡度25度,主沟道比降69.5％,土石山区占流域4％,黄土区占流域面积96％,坡耕地面积占总面积79.6％,沟谷面积占总面积35.3％。小沙沟流域为治理区,流域面积0.038平方公里,主沟道长200米,沟道比降145‰,流域平均坡度27度,土石山区占流域
Starting from 1981, I station set up a runoff test site in the downstream of Nanqu Gou of Hequ County for routine test research. Three years, get some information. The test layout of the runoff field includes two small watersheds and five slope runoff areas. Watershed measures to take vertical and horizontal comparison of a combination of methods, that Shahezikou watershed as a control area, the basin area of 0.085 square meters, the main channel length of 414 meters, the basin average gradient of 25 degrees, the main channel than 69.5 %, Soil rocky mountain area accounts for 4% of the drainage area, the loess area accounts for 96% of the drainage area, slope farmland area occupies the total area of 79.6%, valley area accounts for the total area of 35.3%. Xiaoshaogou watershed is a governance area with an area of 0.038 square kilometers and a main channel length of 200 meters with a channel ratio of 145 ‰ and an average gradient of 27 degrees.