黄土丘陵沟壑区小流域侵蚀产沙的地貌分带研究

Soil Erosion and Sediment Yield of Physiognomy Zonations of Small Watershed in Loess Hilly and Gully Region

根据黄土丘陵沟壑区的侵蚀产沙规律 ,将晋西羊道沟小流域划分为坡面、沟坡和沟道 3个大的地貌单元 ;并在坡面、沟坡和沟道不同的地貌部位建立了相应的侵蚀产沙关系式 ;在GIS空间分析的基础上 ,计算出流域的汇流网络 ,并引入到地貌分带研究中 ,计算结果反映了小流域不同地貌单元的侵蚀产沙规律 ,揭示了水沙汇流在小流域产沙中的重要意义。

On the basis of rules of the soil erosion and sediment yield of the loess hilly and gully region, we divided the Yandaogou small basin into three large physiognomy zonations; and established relevant soil erosion and sediment yield equations in the different physiognomy zonations of the hillslope, the valley slope and the channel. Based on the analysis of GIS, we calculated the drainage networks of small basin and introduced it into the study. The results of the calculation reflected the differences of various physiognomy zonations and illustrated the significance of the conflux of water and soil in a small basin.