DETERMINING GROUNDWATER SUSTAINABLE YIELD IN BASINS:A CASE STUDY OF YINMA RIVER BASIN
The main goal of this study is the evaluation of groundwater sustainable yield, which is the basis of reasonable groundwater development as well as a complex and difficult issue in hydrogeologic research. One major drawback limiting the determination of groundwater sustainable yield is the lack of a unified evaluation criterion because there are many factors involved in hydrological systems that are difficult to quantify. To address this problem,the concept of basin groundwater sustainable yield was redefined through analysis and summary of its development and application. Specifically, an integrated evaluation system was built with the goal of improving the water use ratio for the entire basin, highlighting the integral development and utilization benefit of basin water resources and environmental water demand,as well as the influence of artificial regulation of the groundwater system. The system for the evaluation of basin groundwater sustainable yield consists of a benefit model, water cycling simulation model and an optimization model. The basin water cycling simulation model is taken as a research platform and used to simulate strategies with different constraints, and the best water development strategy is then selected by using the integral benefit model of water resources development. When the Yinma River was used as an example, the calculated groundwater sustainable yield is 2. 516 × 108 m3 /a under the best strategy, which requires a high proportion of reservoir supply(4. 850×l08m3 )to meet suitable ecological water demand simultaneously.
groundwater sustainable yieldbasinintegral benefit modelYinma River
NETL
NSTL
万方数据
维普
