漓江流域含沙量变化研究

Study on sediment concentration variation in Lijiang River basin

根据漓江流域现状及降雨量的分布特点,分析了桂林水文站近50年的水文资料,漓江流域多年平均降雨量、多年平均径流量及多年平均流量等均属正常变化,但河流的含沙量却明显增加,河床有逐渐抬高的趋势。流域内暴雨强度越大,历时越长,上游水土流失越严重,漓江流域含沙量变化越大。这种变化的原因,有自然因素和人类活动因素两方面。对漓江流域的现存问题,作者提出了环境治理措施及管理建议。

Human activities have caused the constant deterioration of ecological environment, serious soil erosion in the upper reach of Lijiang River, and deposition and channel bed rising in the downstream river. According to the Lijiang River basin＇ s present situation and precipitation distribution characteristic, the author analysed nearly 50 years data from Guilin hydrological station. It concluded that average annual precipitation, runoff, discharge are in normal varying scope, but sediment concentration increases and the river bed has a rising tendency. The analyses also show that the more intensive and longer storms cause more serious soil erosion in the upper reach and higher sediment concentration of the river. The main reasons caused such change include natural factor and human activity. Finally, the authors proposed measures to improve eco-environment and the management suggestion for the Lijiang River.