大通河调水对水资源及生态环境的影响

基于生态需水、河流纳污能力、水环境容量等理论,分析研究大通河调水前后可能引起的河道生态环境各要素变化的程度和范围。结果表明,跨流域调水将引起不同河段水资源的剧烈变化,特别是天堂寺、享堂河段会产生断流,进而对河道内生态、水环境及河谷周边陆地生态产生显著影响。综合各方面需水要求,下泄月平均流量至少不小于1.1 m3/s。

Influence on water resources and eco-environment due to water transfer from Datong River

Based on the theories of ecological water demand,pollutant receiving capacity of rivers,and water environment capacity,the possible variation extent and scope of the factors related to ecological and water environments caused by water transfer were studied.Results showed that inter-basin water transfer would cause severe changes of water resources in different river segments,especially that water in two river segments would disappear after water transfer.Furthermore,it would have strong impacts on the ecology in the river course,water environment and upland ecology along the river valley.Taking all aspects of water requirement into consideration,the mean monthly water discharge should not be less than 1.1?m~3/s.