丹江口水库下游河床冲刷与水位降落对航道的影响

在冲积性河流上修建水库以后,因水库的调节作用水库下游的水、沙过程发生巨大改变,导致河床新的变形,直接影响航道水深的变化,给航道带来不同影响。本文根据水库下游丹江口至碾盘山河段的观测资料和河床演变分析,论证了在水库调节作用下河底降低与水位下降关系的五种变化类型,分析了五种类型产生的原因和条件,这不仅对汉江中游的航道整治具有重要意义,而且对水库下游冲积性河流的冲刷,特别是三峡工程兴建后河床冲刷对航深的影响均具有一定的参考价值。

Effect of Bed Erosion And Fall of Water at the Lower Reach of Danjiangkou Reservoir on the Waterway

After the reservoir was built on the alluvial river, water and sediment processes at the lower reach of the reservoir changed greatly, which causes redeformation of the river bed and variation of water depth of the channel and brought about difficulties to navigation. On the basis of the analysis of observation data and bed process data of the river section from Danjiangkou to Nianpanshan at the lower reach of the reservoir, five types of variations of the relations between everage bed lowering and water falling due to the effect of the reservoir controlling are described in this paper and their causes and conditions are analyzed as well.The paper will be not only important to the waterway regulation of the middle reach of Hanjiang River, but also valuable for reference to the studies on erosion of alluvial river at the lower reach of the reservoir and especially on the influence of bed erosion of the reach behind the dam of the Three Gorge Project on the channel water depth.