北江中下游河道生态需水分析

Analysis of the Ecological Water Requirement of the Middle and Lower Reaches on Beijiang River

以横石水文站为控制站点,结合其47a的天然月平均径流资料和飞来峡水库建库后的月平均出库流量资料,分别采用逐月最小生态径流法计算得到建库前后北江中下游的最小生态需水过程,以及用月保证率法计算得到的适宜生态需水过程。运用蒙大拿法对计算结果进行分析,指出飞来峡水利枢纽的调度对下游河道生态系统稳定的重要性。

The paper studied the ecological water requ irement of the middle and lower reaches on Beijiang River. Based on the natural mean monthly discharge data of Hengshi hydrologic station and the mean monthly discharging of Feilaixia Hydro Project, the least ecological water requirement was figured out by the least monthly ecological runoff calculation method, and the appropriate ecological water requirement was calculated by the monthly guaranteed frequency method. Then the paper analysed the calculated results by Montana Method. Finally, the paper pointed out that the dispatching of Feilaixia Hydro Project played an important role on the balance of ecological system of the middle and lower reaches on Beijiang River.