Study on Groundwater Level-water Quantity Response Relationship and Dual-Control Water Withdrawal Index in Plain area
Due to unscientific groundwater development activities,the groundwater level in some areas of China has declined seriously,trig-gering a series of geo-environmental problems,and there is an urgent need to formulate the dual control management measures of groundwa-ter level-water quantity to realize the sustainable development and utilization of groundwater.However,a single water quantity control index cannot meet the scientific management demand of water withdrawal control,so this paper takes Xiangyang city plain area as an example,us-es groundwater numerical simulation method and combines the simulation prediction of different scenarios to study the response relationship of groundwater level-water quantity,so as to determine the dual-control water withdrawal index.The results show that,the groundwater lev-el in the study area shows a good correlation with the exploitation amount and rainfall.With the increase of exploitation intensity,the ground-water level shows a significant downward trend.The response relationship between groundwater level and exploitation amount can be used as an important basis for determining the control water withdrawal index.By controlling the precipitation conditions and the water level threshold of the over-exploitation area,the water level and water volume thresholds are calculated according to the water level-water volume response relationship.The permissible extraction volume threshold of shallow groundwater under the current exploitation conditions is 1.16×108 m3,and the average water level threshold is 93.11 m.Considering the spatial heterogeneity of the hydrogeological conditions,the spatially differ-entiated partitioning of the dual-control indexes is carried out,which provides a reference basis for the scientific management of groundwater.
Xiangyanggroundwaterresponse relationshipwithdrawal control indexes
万方数据
维普
