摘要
水库消涨带是随水库水位涨落不时出没的库岸 ,坡面裸露 ,泥沙侵蚀强度大 ,生态环境恶劣。本研究采用野外定点观测方法 ,研究了新丰江水库消涨带花岗岩风化壳泥沙侵蚀机理 ,实测各类坡面的侵蚀模数 ,估算了总侵蚀量 。
The water fluctuation belt of a reservoir is that between high and low water levels along the bank, which often appears above and submerges under the water alternately. Because few plants can well grow in such environment that is either very wet or very dry, usually the belt appears as a bare slope and has serious soil erosion problem. In this research project field observation has been made and the mechanism of soil erosion on granite weathering crust of the water fluctuation belt along the bank of the Xinfengjiang reservoir is studied. The results show that the erosion rate varies from 1 2 t/m·a to 3 7 t/ m·a , i e. the erosion modulus about 6 4×10 4～7 7×10 4 t/km 2· a, that means a soil layer of 4～5cm thick on the water fluctuation belt may be eroded in a year , much greater than that on the general hillsides. The total eroded volume in the studied area is estimated to be 25×10 4～30×10 4 t/a. The mechanism of bank collapse on the water fluctuation belt is compared with that of disintegration and landslip on granite weathering crust of hills.
出处
《热带地理》
2002年第2期166-170,共5页
Tropical Geography
基金
广东省攻关项目 (ZKM0 610 3S)
