基于生态水力半径法的武江流域生态流量研究

采用综合反映水生生物需求和河道断面信息的生态水力半径法,对武江河上北江特有珍稀鱼类省级自然保护区内的生态流量和生态水位进行估算。结果表明:生态水力半径法计算的生态流量过程线上存在明显的低流量、高流量和流量脉冲等水文要素,符合鱼类的自然需求;天然径流量下生态水力半径法估算的生态需水均可得到满足,但武江上梯级开发较多,需进行生态水位开展闸坝联合调度来保障河道的生态需水,确保犁市(二)站断面处各月份水深不小于平均生态水深。

Research on ecological instream flow of Wujiang River Basin based on ecological hydraulic radius approach

With the ecological hydraulic radius approach reflecting aquatic needs and channel section information, the ecological instream velocity and ecological water level in the provincial natural reserve of rare and endemic fishes in Beijiang River of Wujiang River were estimated. The results showed that hydrological elements such as low velocity, high velocity, and flow pulse featured on the ecological instream velocity process curve by ecological hydraulic radius approach, meeting the natural demands of fishes. The ecological water demand estimated by ecological instream velocity process at natural runoff could be met. Due to the cascade development on Wujiang River, the management of gate dam operation is required to guarantee the ecological water demand of the river, so as to ensure the appropriate water depth of Lishi (II) station, which is not less than the mean ecological waterdepth.