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1 南那沟小流域概况1.1 地理位置南那沟小流域位于河南省孟州市西约10.5km 处,涉及孟州市的赵和、谷旦、槐树、东小仇4个乡(镇),为蟒河的一级支流,流域总面积50.6km~2,其中水土流失面积40km~2。1.2 地貌、地质南那沟小流域属黄土丘陵区,地貌由梁、坡、沟组成,流域内沟壑纵横,坡陡沟深,地面坡度在150°以上。整个流域呈树枝状,主沟道长13.5km,沟道平均比降1/80～1/100,沟道底平均宽度80～90m;有3条较大的支沟,支沟平均长3km,平均比
1 Nanarugou small watershed 1.1 Geographic location Nannagou small watershed is located in the west of Mengzhou City, Henan Province, about 10.5km, involving Mengzhou Zhao and, Gu Dan, Ash, Dongxiao 4 townships (towns) , The first tributary of the python river, the total basin area of 50.6km ~ 2, of which soil erosion area of 40km ~ 2.1.2 landscape, geology Nannaogou watershed is a loess hilly region, the topography of the beam, slope, ditch, within the basin Longitudinal and ravine, steep slope ditch depth, the ground slope in more than 150 °. The whole drainage area is dendritic. The main channel length is 13.5km, the average channel ratio is 1/80 ~ 1/100, and the average channel bottom width is 80 ~ 90m. There are 3 large branch channels with the average length of 3km, Average ratio