水库下游河湾平面形态变化规律研究

Investigation on the variation of meandering channels downstream reservoirs

水库运用势必改变河道的水沙过程,下游河道也会随之发生不同程度的演变。本文基于这个问题,研究了汉江丹江口水库、长江葛洲坝水利枢纽蓄水运用后下游河湾平面形态的变化规律,主要内容包括河湾发育概况、水库运用对河湾平面形态的影响以及在不同的来水来沙条件下典型河湾平面形态变化。并结合大量实测资料拟合出水库下游河湾平面形态参数的经验公式,公式经验证,可以用来预测相同类型水库运行后下游河湾平面形态的变化规律。

The reservoir operation would certainly change water and sediment processes. This may cause a corresponding change of the reach downstream reservoirs. The paper has studied the variation of the river bends in the downstreams of Danjiangkou reservoir in Hanjiang River and the Gezhouba reservoir in Changjiang River. The research mainly aimed at the development overview of river bends, the effects of reservoir operation on river bend shape, and the development laws of typical river bend shape under different water and sand sediment processes. An empirical formula has been got based on a large amount of field data which can be used to predict the development laws of the river bend shape in the reach downstream the similar reservoirs.