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《Journal of Natural Resources》 2012-05
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Ecological Flow Evaluation Based on Hydrological Alterations in the Dongjiang River Basin

ZHANG Qiang1,CUI Ying1,CHEN Yongqin David2(1.a.Department of Water Resources and Environment,b.Key Laboratory of Water Cycle and Water Security in Southern China of Guangdong High Education Institute,Sun Yat-sen University,Guangzhou 510275,China;2.Department of Geography and Resource Management,Chinese University of Hong Kong,Hong Kong,China)  
Climate changes and human activities combine to cause hydrological alterations in Dongjiang River Basin.River ecosystems have adapted to the hydrological status before variation.After variation,the local ecosystem is bound to be affected more or less.In this case,M-K test,the scanning t test and the Rank Sum Test method,combined with the actual situation in Dongjiang basin are used to thoroughly analyze the abrupt streamflow behaviors.Then the ecological flow(minimum,optimal and maximum ecological flow) of four hydrological stations in Dongjiang River Basin is estimated by using the monthly frequency calculation technique.The research results indicate that:1) The estimated ecological flow in this paper is reasonable when compared to those by Tennant method.2) There are significant variations in Longchuan,Heyuan and Lingxia stations,after variations,the amount of annual streamflow does not meet the optimal ecological flow in June.So we should increase water diversion appropriately in this month in the near future.Besides,this study also provides a reference technical framework for establishing a ecological flow warning system in Dongjiang River Basin,and is also of scientific and practical merits in ecosystem health and basin scale water resource management.
【Fund】: 国家自然科学基金(41071020 50839005);; 广东省科技厅对外合作项目(2010B050800001 2010B050300010);; 中山大学青年教师重点培育项目(2009-37000-1132381);; 香港特别行政区资助局项目(CUHK405308)
【CateGory Index】: P333.1
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