小流域沟间与沟谷地径流泥沙来量的探讨

An Approach to Runoff and Sediment Generation of Gully and Intergully Land in Small Watershed

黄土丘陵区的沟间地面积一般占50％左右,通过比较分析,提出用系统分析法来计算小流域沟间、沟谷地的产流产沙量。结果发现沟间地侵蚀量占40％左右,沟谷地占60％左右,沟间沟谷地产流量接近,但沟间地径流下沟最少能使沟谷地侵蚀量增加1倍,因而,沟间地径流造成的侵蚀量占全流域的70％左右。

In loessal hill region, the intergully land is about 50％ of the total area. Through the comparison and analysis, a method of system analysis is put forward to calculate the runoff and sediment quantity of gully and inter-gully land in small watershed. It is found that the erosion of gully and intergully land is respectively about 60％ and 40％ of the total. The runoff yields between this two land types are nearly equal, but a half of the gully erosion, at least, is caused by intergully runoff flowing down the gully, so there is 70％ of the total erosion which is caused by intergully runoff.