The interaction between groundwater and rivers is critical to maintaining the health of river ecosystems,but the quantitative research on the groundwater discharge to large rivers in humid regions is currently weak.In response to this problem,in this paper it takes the Jingjiang Section of the middle reach of the Yangtze River as the study area,and uses the 222Rn mass balance model to estimate the groundwater discharge in the Jingjiang Section of the middle reach of the Yangtze River through field sampling and hydrometeorological data collection,and uses the EC mass balance model and water balance model to verify the result of 222Rn mass balance.The results show that the average groundwater discharge rate of the Jingjiang Section in the middle reach of the Yangtze River is 133 mm/d,the total discharge volume is 1.06×108 m3/d,and the contribution to the water balance is about 10.99%.Among different sub-sections,the groundwater discharge rate from Zhicheng to Shashi is the highest,and the groundwater discharge rate from Jianli to Luoshan is the lowest.Aquifer richness and groundwater table may be key factors controlling the rate of groundwater discharge.This research is of great significance for the local eco-environmental protection and the control and management of water resources,and can also provide a theoretical basis for the better development and utilization of water resources in the middle reach of the Yangtze River and eco-environmental protection in the future.
groundwater dischargeradonwater balanceJingjiang Rivermiddle reach of the Yangtze Riverhydrogeology
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