Effect of Green Water Management on River Base Flow

Danjiangkou Reservoir and its upstream tributaries as water resource area is of strategic importance for the Mid-route of South-to-North Water Transfer Project. Ecological and water security are the key measures for sustainable water diversion. Green water management as a new technology to achieve water conservation and water purification has a broad application prospects. In this research, green water management such as bench terraces, contour tillage, mulching and stone line was studied in the Upper Du watershed. ArcSWAT model was used to assess effect of green water management on river base flow. The results show that four green water management measures activated the regulating action of “soil water reservoir”. Base flow in export section of Upper Du river basin is increased under different four green water management measures, and especially the base flow increased more obvious in non-flood season. That is helpful to improve the ecological security degree in water resources area.