永定河门头沟段河道生态需水特征研究OA北大核心CHSSCDCSTPCD

In order to enhance the ecological health of the Yongding River in Mentougou District,to guarantee the ecologi-cal water demand of the river,and to address the impacts of climate change and human activities on the river ecosystem,the current study analyzed the characteristics of the evolution of hydro-meteorological elements and the time series dynamics of the ecological water demand of the river.In accordance with the ecological protection objectives of the Yong-ding River in Mentougou District,five river ecological water demand components,namely ecological base flow,aquatic life water demand,sediment transport water demand,self-purification water demand and water surface evaporation,were inte-grated and calculated using the environmental function setting method.Furthermore,the factors affecting the river ecologi-cal water demand were determined by quantitatively analyzing the impacts of climate change and human activities on runoff.The results indicated that the average annual temperature in the study area exhibited a significant upward trend from 1980 to 2020,while the annual precipitation exhibited a slight increase but not to a statistically significant degree.The ecological water demand of the river in the region demonstrated a downward trend from 1980 to 2020,with the aquatic wa-ter demand representing the largest component.It can be concluded that human activities represent the most significant fac-tor influencing the ecological water demand in the region,which in turn affects the runoff volume and subsequently the eco-logical water demand of the river.The findings of this study may serve as a theoretical foundation for future water alloca-tion,water resource management,and the prediction of the ecological water demand of the Yongding River in Mentougou District.