Evapotranspiration simulation with different scenarios analysises of Fangshan District by SWAT model

Fangshan district of Beijing belongs to Haihe river basin where the water resource is shortage and the regional underground water is over-extracted. On the basis of the information of the district and joining the SWAT model database, the relative attribute database for the district was made up and the SWAT model was constructed eventually. The SWAT model was applied to simulate evapotranspiration(ET) and water environment of the study area under different controls in the year 2020 and 2030, and the results showed that among the eight scenarios, simulation ET under consideration of the three factors was close to the target ET well. The first considering factor was the agriculture irrigating management with moderate water saving practice, the second was the optimization of plant structure including the decrease of high water consumption crops and vegetable field, increase of forest land, installment agriculture and fruits cultivation, and the third one was the control of the overexploitation of groundwater. Under the water resources planning management program in the scenario, the excessive water exploitation in Fangshan district will be constrained, the over-exploitation of groundwater will be terminated, and the goal of sustainable development of river basin will be achieve ultimately. The analysis report will provide an important basis for integrated management in the study area.