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现将上砭沟流域水土保持综合治理效益观测资料整理分析如下。 一、流域概况及水保现状 上砭沟流域17平方公里,属延河二级支沟,位于延安市城西北15公里,海拔高程1023至1342米,相对高差248米,主沟长9.5公里,流域平均宽度1.96公里,干流平均比降3.8％。 该流域属黄土丘陵第二付区。流域呈柳叶状,沟床为V字形,沟壑密度每平方公里2.69公里。境内有8道梁,27道峁,一公里以上支沟有17条,多数是“两沟夹一峁’或 “二沟夹一梁”,地形纵向复杂多变,横向一般简单,谷缘线不断向上伸展,谷坡不断
Now Shanggou ditch basin soil and water conservation benefits of integrated observation data collation analysis is as follows. First, the basin and the status of water and soil conservation Shanggou Gully basin of 17 square kilometers, Yan River is a secondary branch, located 15 kilometers northwest of Yan’an City, elevation 1023 to 1342 meters, the relative elevation of 248 meters, the main channel 9.5 km long , The average width of the basin 1.96 km, the average drop of 3.8% of the mainstream. The basin belongs to the loess hilly second paid area. Valley is willow-like, ditch bed V-shaped, gully density of 2.69 kilometers per square kilometer. The territory has eight beams, 27 峁, more than one kilometer branch has 17, most of the “two trenches clip 峁” or “two trenches a beam”, the vertical and horizontal terrain complex, horizontal general simple, Continue to expand upward, Valley slope constantly