Calculating The Ecological Water Demand Of River And Lake System

Water resources play an important role in maintaining the health of river ecosystems.In recent years,due to the unreasonable utilization of water resources,the lack of water resources in the Baiyangdian Basin has caused serious ecological and environmental problems,such as river outages,vegetation degradation,and shrinkage of wetland areas.This paper theoretically studies the ecological water demand of the Baiyangdian Basin and calculates the overall ecological water demand of the basin,providing theoretical basis and scientific support for the restoration of the water ecology of the Baiyangdian Basin.The main research contents and conclusions are as follows:a.Based on the ecosystem health,the indicators that affect the ecological water demand are analyzed,and the effects of different ecological indicators on the river ecosystem and its ecological water demand are studied.b.According to the spatial differentiation of rivers,and combining the shape of the river,the ecological environment function of the river and the type of water demand,the idea of studying the ecological water demand of the river system is established.On this basis,IHA-RVA is used to calculate the ecological water demand of rivers with complete daily runoff data,the Perihygrometry is used to calculate the ecological water demand of rivers with cut-off or insufficient hydrological data,and the TVET model is used to calculate the Ecological water requirement.c.Based on the holistic and systematic nature of the Basin ecosystem,from the perspective of holistic,an integrated calculation model of the ecological water demand of the river system and the ecological water demand of the watershed is established,and this model is used to calculate the ecological water demand of the watershed.Provide a basis for the rational allocation of water resources in river basins under different situation goals.d.The integrated analysis of the river system shows that the total ecological water demand is 1.224 billion m3 / a.The ecological water requirement of Juma River,Tang River,Cao River and Baigou River is obviously larger than that of Xiaoyi River,Puhe River and Fuhe River.The water demand corresponding to the restoration area of 186km2,240 km2,and 360 km2 of water surface and vegetation transpiration of Baiyangdian Lake are 0.86,1.24,and 199 million m3 / a in turn.Integrating the ecological water demand of river courses and lake marshes wetlands,the ecological water demand of Baiyangdian Lake is 1.538 billion m~3/a.