Under Xinlicheng Dam Of Yitong River Based On SWAT Study On Ecological Water Regulation

Reservoirs are important structures in the terrestrial water cycle.Humans use reservoirs to achieve flood control and irrigation goals.However,the construction of reservoirs on natural rivers will also lead to the destruction of the aquatic ecosystems downstream of the rivers and change the hydrological characteristics of the river basin.Therefore,based on the analysis of the natural geographic characteristics of the river,studying the impact of reservoirs on the river ecosystem has become one of the important issues that people pay attention to.Among them,how to design and maintain the minimum water volume of the river ecology,that is,the ecological water volume,has become a key issue for research.The Xinlicheng Reservoir is located on the Yitong River and is an important source of drinking water in Changchun City.Due to the lack of water resources,the ecological water supply from its dam down to the urban area of ??Changchun City is seriously insufficient.It is imminent to make ecological water replenishment for Yitong River through the water supply project from the central cities of Jilin Province,and use its water volume in conjunction with various water replenishment sources to conduct reasonable ecological water volume control.This paper first establishes the SWAT distributed hydrological model,divides the sub-basin and HRU,uses the runoff data of the Yitong Hydrological Station to calibrate the parameters,and simulates the hydrological process of the Yitong River Basin from 2010 to 2020,and obtains the sub-basin The monthly water production of the basin;and the monthly water production of the sub-basin was verified based on the measured data.Then,according to the water quality requirements of the Yitong River water function zone combined with the analysis of the runoff results simulated by the SWAT model,the outlet of the sub-basin that meets the water quality requirements was determined The minimum water volume is the ecological water demand at the entrance of Changchun City on the Yitong River;finally,the ecological water demand of the Yitong River,the discharge water volume of the reservoir,the discharge volume of the sewage treatment plant,the water production volume of the river basin,and the ecological water return of the central city are comprehensively considered to establish the ecological water volume of the Yitong River.Adjust the linear programming model and use Matlab programming technology to calculate the most appropriate monthly discharge volume of Xinlicheng Reservoir.Finally,based on the sewage treatment plant’s monthly discharge of 77.5-77.5 million m~3,the central city’s water supply project from Songjiang will return 1.3 million m~3 of ecological water every month from May to October,and the water catchment volume is 90% of the multi-year water catchment volume calculated by the SWAT model.The guaranteed rate of water volume is to predict the ecological water volume control of the Yitong River after the completion of the central urban water supply project in the future,and formulate the optimal water replenishment control plan from January to December.168,834m~3,842,400 m~3,225,000 m~3,415,300 m~3,808,200 m~3,447,800 m~3,1,139,200 m~3,398,000 m~3,448,100 m~3,247,700 m~3.