梧桐河生态流量分析

Analysis of River Ecological Flow in Wutong River

为定量确定大坝修成后坝址下游所需生态流量,通过Tennant法、湿周法和R2-Cross法对坝址至河口断面不同时间段维持水生态系统稳定所需的水量进行计算,并结合维持河流水环境质量的最小稀释净化水量和河滩湿地生态补水量的估算结果分析坝址断面下泄流量。计算结果为:鱼类产卵期(4—8月)的下泄生态流量为5. 74 m3/s,一般用水期(9月至次年3月)的下泄生态流量为1. 76 m3/s;除6月份外,其他月份用于维持河流水环境质量的最小稀释净化水量、河滩湿地生态补水量可由天然降水补给,6月份时对小山亮子断面的生态基流增加0. 01 m3/s后方可满足这两项水量的补给。通过对坝址断面下泄流量的分析,可为水资源配置及大坝管理提供科学依据。

In order to quantitatively determine the ecological flow required at the lower reaches of the dam site after completion of the dam,by means of Tennant method,wetted perimeter method and R2-Cross method,the water requirement for water ecosystem stability at different periods of dam section to estuary section is calculated,and the discharge flow of dam section is analyzed with the estimation of minimum dilution purified water quantity for maintaining water environment quality and ecological replenishment of floodplain wetland.The results are as follows:in the fish breeding period from April to August,the discharge ecological flow is5.74m^3/s,and in the general water period,the discharge ecological flow is1.76m^3/s;in addition to June,the minimum dilution purified water for maintaining the river water environment quality and the ecological recharge water of the floodplain wetland can be replenished by natural precipitation,while in June the ecological base flow of Xiao-shan-liang-zi in June need increase by0.01m^3/s to meet these two supplies.The analysis of the discharge volume of the dam site can provide a scientific basis for water resources allocation and management.