关键词: 生态流量; 径流变化; 熵理论; 流量历时曲线; 黄河流域;

Abstract: The study of runoff and ecological flow in the Yellow River Basin can provide scientific and theoretical basis for the scientific management and sustainable development of water resources in the Yellow River Basin.Based on the flow observation data of 10 main hydrological stations in the Yellow River Basin(1961～2012),the flow variation was systematically analyzed by using the empirical flow duration curve and entropy-based flow duration curve, and the ecological flow variation was further estimated.The results show that the annual runoff of the Yellow River Basin has declined in the past 52 years.Compared with the flow duration curve based on experience, the flow duration curve based on entropy theory has flexibility and certain statistical basis, which can better show the flow duration and frequency changes in the basin, and then estimate the ecological flow.The results of eco-flow estimation show that after 1990 s, the eco-flow of hydrological stations had showed a general decreasing trend in the Yellow River Basin, which leads to the deterioration of the eco-environment and affect the ecological function of the basin to a certain extent.

Key words: ecological flow; runoff change; entropy theory; flow duration curves; Yellow River Basin;