| With the fast development of small hydropower construction in the mountainous area, it had been destroying the local ecological environment seriously.How to balance the relationship among social benefits,economic benefits and eco-environmental benefits correctly is a problem,which must be paid high attention to development and utilization of small hydropower.Baisha River,with abundant water resource,is typical mountainous basin river in Sichuan province.In recent years,the situation of engineering water shortage of basin is becoming more and more serious due to cascade development of small diversion-type hydropower stations.This paper,with Baisha River as its research object, did a preliminary research on the matter of its ecological water demand and water allocation,basing on the influences of reducing reach of cascade development hydropower station in basin.Basing on specific analysis of recent situation of Baisha River and according to special condition of Baisha River,this paper,estimated the ecological water demand for the two sides of the in-stream and out-stream respectively by choosing the methods which are suitable for Baisha River basin.The results are as follows:Ecological water demand for in-stream of Baisha River is 1.293×10~8m~3,accounting to 22.04%of total runoff;ecological water demand for out-stream of Baisha River is 2.51×10~7m~3,accounting to 4.30%of total runoff;ecological water demand for Baisha River basin is 1.544×10~8m~3,accounting to 26.34%of total runoff.According to the condition of reducing reach of cascade development of diversion-type hydropower stations in Baisha River basin,we take Tennant to discuss the issue of discharge flow of cascade development hydropower station.In order to meet basic water demand for eco-environment of reducing reach in basin,hydropower station dam should be discharged in a certain flow at different times,which should happened in the dry season.Taking five of the cascade hydropower stations have been in operation as an example, we analyze the profit and loss of ecological water demand for cascade hydropower development in basin;discuss the relationship between ecological water use and the loss of power generation profits.When the flow percentage risen from 10%to 20%and from 20% to 30%,the eco-environment and hydropower station for water resource on the fierce competition reasonably,and the conflict between ecological water use and the profits of power generation is more prominent reasonably.Taking the sustainable development of basin as its precondition,according to utilization characteristic of water resource,and aiming at ecological water demand in Baisha River basin,in view of objective of society,economy and eco-environment,this paper established multi-objective optimal allocation model of water resources.Meanwhile, it presents an optimal allocation project for water resource of basin.The results are as follows:After the optimal allocation of water resources in Baisha River basin,the situation of water shortage of each water use department has been eased in 2005;the effect of water allocation is best,and the allocation of water resources is reasonable under the eco-environmental and economic harmonious development project in level years of 2010 and 2020.In this paper,the research on ecological water demand and allocation and reducing reach of cascade development hydropower Stations in Baisha River basin,it greatly enriched research content on ecological water demand of basin,meanwhile,it supplied scientific data for the development and utilization of water resource and sustainable development of basin,furthermore,it has meaningful guidance for sovling problems of reducing reach of cascade development hydropower stations of basin.
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