福建省花岗岩坡地沟谷侵蚀试验研究初报

Study on Gully Erosion of the Granite Slope in Fujian Province

根据野外考察和定点径流泥沙资料,对花岗岩坡地沟谷侵蚀动力机制、径流泥沙运行规律、发育过程、侵蚀模数等进行定量分析。指出浅沟在坡地折坡处是引发切沟发育的主要地段,是浅沟治理的重点部位。崩岗沟发育地区土壤侵蚀模数大,是花岗岩坡地水土流失防治的重点。

Based on the fields survey and measured data obtained from the slope-spots and gauge stations of silt-runoff, the analyses on the erosion mechanism, development and the modulus of sediment yield of the deferent types of gullies in the granite areas have been conducted, and some qualitative models have been established. The results show that the section on the convex slope is apt to the gullies development, and the protective measures should be focus on the slope. The modulus of sediment yield of collapsing hill-gullies can reach 60 000 -100 000 t/km2·a, which would be critical problem , and some protective measures for the collapsing hill-gullies control should be urgent carried out.