富春江东洲北支河道整治影响试验研究

Experimental Study on River Regulation Effect at Dongzhou North Branch of the Fuchun River

北支江截流坝拆除整治后,东洲岛水域的分流条件必然会有大的改变。为研究北支江整治后分流比改变对下游水域的水动力影响,采用物理模型针对100a-遇洪水条件,对汇流段流态变化及下游沿程水位、流速的变化进行试验研究。试验表明,拆坝整治后闻堰弯道险段的流速增幅在0.5%之内,下游五丰岛北汉分流比增幅在0.2%~0.5%。试验成果作为北支江综合整治方案设计的依据,并可作为分汉河段整治工程的参考。

After demolishing the plugging dam in North Branch River,the diversion condition will change greatly in the waters of the Dongzhou Island.In order to investigate the effect of changing the diversion ratio of regulation on the hydrodynamics in downstream of the North Branch River,based on the physical model test,the variation characteristics of flow pattern in confluence segment and the water level and velocity along the way in downstream was studied for 100・year flood.The results suggest that after regulation the velocity increased less than 0.5%in the risk segment of Wenyan,the north trench diversion ratio increased from 0.2%to 0.5%ofWufeng Island in downstream.The test results can be used as the scheme design of comprehensive control in North Branch River,as a reference of engineering for the regulation of braided reach.