Research On Ecological Base Flow And Reservoir Ecological Operation Model Of Yanshan River

With the development of our national economy, sewage discharge made the ecological function of rivers decrease.Meanwhile,as the projects of medium and small hydropower stations grow day by day, the river channel become unable to meet the normal ecological base flow.Therefore, how to guarantee the proper water volume for the river ecological system, how to ensure a healthy river ecosystem,these are urgent problems at present.Based on the base flow problems of Yan-shan river,this paper does related research.Firstly,this paper analyzes the research progress of the water demand of the eco-environment in the water couse at home and abroad.Based on it, it sums out the present ecological environment problems of the water demand,meanwhile, discusses the related concept of ecological base flow, the method of calculation and the advantages and disadvantages of each method. By the method of minimum monthly average flow,the ecological hydraulic radius method and the Tennant method,this article calculates the ecological base flow of lead mountain river.They are 3.25 m3/s,4.90 m3/s and 5.42 m3/s,and then it concludes that the ecological base flow of the Yan-shan river is 5.42 m3/s.Secondly,based on the river ecological base flow,this article makes the reasonable allocation of water resources of the Yan-shan river.It analyzes the main factors which influence the base ecological flow of the the Yan-shan river, including lead irrigation, high mountain store reservoir and other factors.And it also analyzes the influence that arises from the ecological base flow surplus and lack problems.In order to meet the protection of the ecological base flow of the Yan-shan river solving these problems is very important.Finally, this paper establishes ecological scheduling model of the Yan-shan river.By choosing typical year, wet and dry year, flat water year, it calculates the reservoir ecological water demand of high shop and the adjusting results.In the end, it ensures the ecological rivers base flow of Yan-shan river from the reasonable allocation of water resources, water saving, using river sewage, urban wastewater recycling utilization and other measures.