长江中游荆江段地下水排泄的量化及其空间差异性分析  

Quantification of Groundwater Discharge and Its Spatial Variability in Jingjiang Section of Middle Reach of the Yangtze River

作　　者：周子皓 杜尧[1] 孙晓梁 范红晨 邓娅敏[1,2] Zhou Zihao;Du Yao;Sun Xiaoliang;Fan Hongchen;Deng Yamin(School of Environmental Studies,China University of Geosciences,Wuhan 430078,China;Geological Survey,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]中国地质大学环境学院,湖北武汉430078 [2]中国地质大学地质调查研究院,湖北武汉430074

出　　处：《地球科学》2024年第4期1448-1458,共11页Earth Science

基　　金：湖北省科技计划项目(No.2020BCA088).

摘　　要：地下水与河流的相互作用对于维持河流生态系统的健康十分关键,但是目前对于地下水向湿润地区大型河流排泄过程的定量化研究较为薄弱.针对这一问题,以长江中游荆江段为研究区,通过野外采样和水文气象数据收集,利用^(222)Rn质量平衡模型定量估算长江中游荆江段的地下水排泄,并用EC质量平衡模型及水量平衡模型验证^(222)Rn质量平衡的结果.结果显示:长江中游荆江段的平均地下水排泄速率为133 mm/d,排泄总量为1.06×10^(8)m^(3)/d,对水量平衡的贡献约为10.99%.其中枝城-沙市段地下水排泄速率最大,监利-螺山段地下水排泄速率最低.含水层富水性和地下水位可能是控制地下水排泄速率的关键因素.本研究对于流域水资源管理具有重要意义,也可为今后长江中游地区水资源的合理开发利用以及生态环境保护提供理论依据.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 ^(222)Rn 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 ^(222)Rn 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 1.06×10^(8)m^(3)/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.

关 键 词：地下水排泄 氡 水量平衡 荆江 长江中游 水文地质学 

分 类 号：P641.8[天文地球—地质矿产勘探]