Abstract
Owing to climate change, human activities and underlying surface change in the basin, a series of hydrological factors have not only changed in the annual form, but also changed the distribution trend of monthly hydrological factors in a year. This phenomenon has seriously affected the ecological w ater demand in the river channel. The calculation and analysis of ecological water demand will be affected by runoff sequence after variations. This paper proposed a distribution trend model of runoff by using Gini coefficient, which was used to identify the variation points of runoff at Ga Datan station in the Da Tong River basin. Then the monthly ecological water demand in the river channel was calculated. Finally, through comparing the mean flow before and after variation, in addition to ecological water demand and broken frequency of ecological flow, the study analyzed the effects of hydrological variations on ecological flow.
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