串联型水体生态需水补水方案研究

在水资源长期短缺的北方地区,拦河蓄水形成的串联型河流坝式景观水体几乎在每个城市都可以看到。为计算维持这种以水景观为主的人工河流生态系统基本健康的最小需水量,以滹沱河水环境修复段为例,构造描述"串联型坝式景观水体"水质、水量变化的综合数学模型,提出了水质、水量相结合的河流坝式景观水体生态需水补水方案。结果显示:75%频率降水情况下,滹沱河水环境修复段现状水平年最小需水量为3 450万m3,并给出了明确的补水时机和补水量,为北方串联型河流坝式景观水体的生态保护提供了支撑。

A scheme to meet ecological water demand of serial water bodies

In northern China,where water resources are in long-term shortage,it is common in nearly every city to see serial river-dam-type landscape water bodies built to obstruct rivers and retain water.To calculate the minimum water required to sustain the basic health of such an artificial river ecological system consisting mostly of water landscape,this paper studied the case of a segment of Hutuo River needing remediation of water environment,built an integrated mathematical model that describes the water quality and quantity changes of the "serial dam-type landscape water body",and proposed a scheme to meet the ecological water demand of river-dam-type landscape water bodies with consideration to both water quality and quantity.The results showed that under the circumstance of 75% frequency of rainfall,the minimum water required by this segment of Hutuo River needing remediation of water environment is 34 500 thousand m3/a.This paper also provided the explicit dates and amount of water supply,and provided support for the ecological protection of northern serial river-dam-type landscape water bodies.