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(一) 高家沟流域,是三川河支流南川河的一条小流域,沟长十点二公里,流域面积十四点一平方公里,平均宽度为一点三八公里,共有大小山梁五十五个,支沟五十二条,沟壑密度5.15公里/平方公里,沟壑面积占总面积的百分之四十四。这里沟深坡陡,植被稀少,水土流失十分严重,年平均侵蚀模数为一点五八万吨/平方公里,年平均输沙量为二十二点三三万吨,相当于地表每年侵蚀厚度十一点三毫米。
(A) The Gaojiagou watershed is a small watershed of the Nanchuanhe River, a tributary of the Sanchuan River, with a length of 10,200 kilometers and an area of 14.1 square kilometers with an average width of 1.38 kilometers. The total size of the mountain is 55 There were 52 branch ditches and a density of 5.15 km / km 2 in gully areas, with the area of ravines accounting for 44% of the total area. Here, the ditch deep steep slope, vegetation is scarce, soil erosion is very serious, the average annual erosion modulus of 15,800 tons / square kilometers, the average annual sediment transport of 223,300 tons, equivalent to the annual surface erosion Thickness of eleven millimeters.