水口电站对闽江航运影响预测

PREDICTIVE EFFECTS OF SHUIKOU HYDRO-POWER STATION ON THE NAVIGATION OF THE MINJIANG RIVER

位于闽江中游装机容量140万kW的水口电站,1993年5月建成后,由于坝头水位抬高58m,淹没132个险滩,拓宽水面5～10倍,使库区现有90多km的浅水航道变成深水航道,并缩短了航程,坝下增加枯水期流量和水深对航运有利,但也存在库区淤积,变动回水区形成脱水段,坝下涨率过大等问题,应采取一定措施加以解决。

Shuikou Hydro-power Station, having 1.40 million kW of installed capacity, is located in the middle reaches of the Minjiang River. The station will be completed in May 1993, and then the water level behind the dam will be raised by 58m, the river width will be as 5-10 times as it is, 132 rapids will be submerged, thus, more than 90 km shallow channel within the reservior will be changed into deep and shorter navigation channel. The increases of the discharge and the river depth below the dam during low water level period will also do good for navigation. On the other hand, however, some problems will come out, such as reservior deposition, dewatered area within the back water reach, and the higher swell rate pertaining to navigation below the dam, which could be solved by adopting some measures.