目平湖水质与松虎河系基流响应关系研究  

Relationship between water quality in Muping lake and base flow of Songhu river network

作　　者：刘昭伟[1] 王智勇[1] 陈永灿[1] 朱德军[1] 

机构地区：[1]清华大学水沙科学及水利水电工程国家重点实验室,北京100084

出　　处：《水力发电学报》2011年第5期20-26,共7页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金(51039002;50823005;50809034);水沙科学与水利水电工程国家重点实验室资助项目(2009-TC-2)

摘　　要：三峡水库的运行调度加大了荆江段枯水期的流量,为通过水库调度改善洞庭湖枯水期水质提供了可能。本文根据洞庭湖的水环境特征,选取目平湖的总磷为研究对象,利用物质守恒原理,建立了目平湖枯水期总磷完全混合模型,模拟了目平湖总磷浓度的变化,计算结果得到了实测数据的良好验证。以松虎河系的2005～2008年枯水期流量变化过程为基础,参照枯水期荆江流量的可能变化,设计了松虎河系不同基流的5种工况,确定了目平湖水量和出湖流量的计算方法,预测了不同基流条件下目平湖总磷浓度的变化,建立了目平湖水质与松虎河系基流的响应关系,分析了三峡工程枯水期补水对目平湖水质的影响。The flow in Jingjiang reach is increased in dry season as a result of the Three Gorges reservoir＇s regulation,so now the water quality in Dongting Lake may possibly be improved through a suitable way of regulation.This paper takes a case study of the Muping lake that has been polluted with the highest load of total phosphorus（TP） in the Dongting Lake system.By mass conservation principle,a model of total phosphorus prediction for the Muping＇s entire water body was developed,and the time variation of TP concentration was simulated.The calculations agreed well with the observed data.Five different base flows were adopted for the Songhu river network,and they are consistent with the river flow in the low flow seasons of 2005-2008,the same period as used in model verification.In this study,the variations of TP concentration were predicted for these base flows cases,a relationship of the Muping＇s water quality versus the Songhu＇s base flow was established,and the effects of Three Gorges regulation in dry season on the Muping＇s water quality were analyzed.

关 键 词：环境水利 洞庭湖 三峡工程 水质 基流 

分 类 号：X143[环境科学与工程—环境科学]