宜昌沙河河道整治引水水源及环境需水量研究

Study on water diversion source and environmental water demand of Shahe river regulation in Yichang

河道引水对改善城市河流水文条件和水环境质量具有重要作用。以宜昌市沙河综合整治工程中引水工程为例,从水源地水质、水量、引水管道布设等方面论证引水工程中水源选择,确定最佳水源地。基于沙河生态及环境用水需求,以水体主要考核的因子COD、BOD5、NH3-N和TP为控制因子,采用环境功能设定法和稳态水质模型法分别对河道环境需水量进行了研究,提出河道生态修复和水质改善的环境需水量指标,并分析不同预测因子对河道环境需水量的影响。

Water diversion plays an significant role in improving river hydrological condition and water environmental quality of urban river.Taking the Shahe river regulation project in Yichang as an example,water source selection was demonstrated and the best water source was determined in aspects of water quality and quantity as well as diversion pipeline layout.Based on the ecological and environmental water demand,it was proposed that COD,BOD5,NH3-N and TP,which are the main assessment indicators of Shahe river,were considered as the controlling indicators.Environmental water demand was studied by means of environmental function setting methods and steady water quality model.It is proposed that environmental water demand index meets the need of ecological remediation and water quality improvement in the river.And the impacts of various prediction indicators on environmental water demand were analyzed.