陡坡侵蚀产沙特点及含沙量过程计算模型研究

Calculative Model of Sediment Content and Features of Sediment-producing by Erosion in Steep Slope Land

该文分析了黄土丘陵区陡坡侵蚀产沙的特点,通过室内人工模拟降雨侵蚀试验和野外径流小区观测资料,对陡坡侵蚀产沙过程及降雨侵蚀产沙量进行了研究。并对溅蚀产沙量与影响因素作了回归分析,表明:室内试验溅蚀产沙量占总产沙量的22%～54%。同时根据试验研究与建模,提出了陡坡降雨径流侵蚀产沙的含沙量过程计算模型。经检验,结构合理,具有较好的实用价值。

The features of sediment-producing by erosion of steep slope land in loess hilly regions were analysed 。 Thecourse of sediment - producing by erosion and sediment - producing amount by rainfall erosion have been studiedby using the simulated experiments of artificial rainfall and the data of natural runoff plots .At the same time,theregressional analysis have been carried out between sediment-producing amount by splash erosion and its influenc-ing factors. The results show that the sediment - producing amount by splash erosion accounts for from 22 per centto 54 per cent of the total sediment-producing amount in the simulated experiments. The calculative model for thesediment content course of sediment - producing by rainfall runoff erosion were developed based on the experimen-tal researches and developing model. The test on this model shows that the model has a rational composition and abetter applicative value。