摘要
金沙江下游侵蚀强烈 ,输沙模数达 2 0 6 0 t/ (km2·a) ,为金沙江流域和长江上游平均侵蚀模数 5 0 0 t/ (km2· a)的 4倍 ,并且近年还在增长。其原因主要有 :河流沿断裂发育 ,岩层破碎 ;金沙江下游是袭夺河 ,侵蚀力强 ;滑坡、泥石流发育 ,侵蚀量大 ;干旱严重 ,植被一旦破坏 ,恢复困难 ;光热资源丰富 。
The erosion is very strong in the lower reaches of the Jinsha River. The modulus of sediment delivery is 2 060 t/(km 2·a), that is 4 times as big as 500 t/(km 2·a), which is modulus of sediment delivery in the basin of the Jinsha River and upper reaches of the yangtze River. The main formations of strong erosion in the lower reaches of the Jinsha River are following:The river develops along the faults. The rocks are broke along faults;The lower reaches of the Jinsha River is a captured river, the longitudinal gradient of river bed is steep;The debris flow and landslide develops extensively and erode strongly;The climate is very dry, and the vegetation recovery is difficult after its breakdown;The light and hot resources are very rich. But the man disturb environment strongly.
出处
《水土保持学报》
CSCD
北大核心
2001年第5期14-17,共4页
Journal of Soil and Water Conservation
基金
中国科学院山地环境学"百人计划"
中国科学院云南省分院合作项目资助
关键词
侵蚀
金沙江下游
erosion
lower reaches of the Jinsha River
