南昆铁路威红区段段家河流域地貌演化与水土流失

A Study on Geomorphological Development and Soil and Water Loss of Duanjia River Valley on Weishe--Hongguo Section of Nanning--Kunming Railway

在对段家河流域多次实地考察的基础上,通过对该流域的地貌特征分析,认为目前段家河流域地貌演化正处于壮年期,是水土流失、滑坡、泥石流的发育和活动的旺盛期;该流域的水土流失比较严重,地表土层的平均侵蚀模数为2 600t/(km^2·a)。根据流域各段水土流失的程度不同,对流域水土流失进行了分区。然后,进一步探讨了水土流失与流域地貌演化的关系。

This paper is based on several on-the-spot investigations of Duanjia river valley in Guizhou province, and goes through analysis of Geomorphological features of Duanjia river valley, it cullsidered that geomorphological development of Duanjia river valley is on the stage in the prime of life,and this stage is exuberant stage of soil and water loss, landslide and debris flow. Going through analysis of present situation of soil and water loss of Duanjia river valley, this paper considered that soil and water loss is seriouser, the erosion modulus of soil is about 2 600t/(km^2·a). According to the different in- tensity of soil and water loss in differeent areas of the valley, this paper has divided different areas of soil and water loss in this valley. Then, the paper has gone further into the relation between soil and water loss and geomorphological development of this valley.