The Dujiangyan Project,located at the junction of the upstream of the Minjiang River and Chengdu Plain,Sichuan Province,China,is an irrigation system project as important as the Great Wall in the history of China.Without dam structures,this project has been continuously playing its crucial role in diverting water for irrigation,separating sediments,and controlling flood for 2275 years.In this study,the predicaments of the Dujiangyan Project under the background of rapid urbanization and social economic development were summarized by conducting the field research and using the Indicators of Hydrological alteration(IHA)method:excessive diversion of water,disruption of hydrological pulses,erosion and deposition imbalance and conflicts between power generation and water supply.These contradictions have led to the weakening of the function of automatic water diversion and sand removal in the Dujiangyan Project.Considering the influence of climate change and strong human activities,we pointed out the challenges faced by the millennium ancient weir in balancing human and environmental water usage and project operation and management based on the simulation results of the hydrological model.The corresponding suggestions about strengthening agricultural water saving,generating artificial flood peak were provided to protect and continue to maintain the function of the Dujiangyan Project.
HUANG Xiao-rongZHOU Xing-yuYOU Jin-junYANG QingWANG Yan-junMA Kai
