地表水‒地下水相互作用对砷在浅层地下水系统中运移的影响  

Effect of Surface Water⁃Groundwater Interaction on Arsenic Transport in Shallow Groundwater of Jianghan Plain

作　　者：余倩 张宇 董听 吴光伟 李平 Yu Qian;Zhang Yu;Dong Ting;Wu Guangwei;Li Ping(College of Resources and Environmental Science,South-Central University for Nationalities,Wuhan 430074,China;Gezhouba Water Service Tianjin Co.,Ltd.,Tianjin 300356,China;Shandong Provincial Space Ecological Restoration Center,Jinan 250014,China)

机构地区：[1]中南民族大学资源与环境学院,湖北武汉430074 [2]葛洲坝水务(天津)有限公司,天津300356 [3]山东省国土空间生态修复中心,山东济南250014

出　　处：《地球科学》2023年第9期3420-3431,共12页Earth Science

基　　金：国家自然科学基金青年基金项目(No.41702245);中央高校基本科研业务费专项资金项目(No.CZQ21013).

摘　　要：地表水‒地下水(SW-GW)相互作用对砷在浅层地下水系统中的运移至关重要,但其模式和强度对地下水中砷运移的影响尚不清楚.本文针对江汉平原仙桃市沙湖原种场野外地下水三维监测试验场,开展野外监测和三维地下水数值模拟.结果发现雨季地表水补给地下水,SW-GW相互作用强度较大,地下水砷浓度升高;旱季地下水补给地表水,SW-GW相互作用强度减弱,地下水砷浓度降低.SW-GW相互作用模式与强度的季节转变导致地下水流速和流向产生季节响应.模型估算出雨季和旱季地面以下10~25 m最大垂向砷交换量分别为457.2 mg/d、191.3 mg/d,地面以下28 m处水平砷交换量分别为4380.0 mg/d、1385.6 mg/d.Surface water-groundwater(SW⁃GW)interaction is critical for arsenic transport in shallow groundwater systems,but the role of its pattern and intensity on arsenic transport remains unclear.Field monitoring and numerical simulation were employed to identify the impact of surface water-groundwater interaction mode and intensity on arsenic transport in shallow groundwater of Shahu field site,Jianghan Plain.The results indicate that the surface water recharged into groundwater and had a relatively stronger intensity in the rainy season,which led to the higher arsenic concentration,and vice versa.The seasonal shift of surface water-groundwater interaction mode and intensity could cause the seasonal response of groundwater flow velocity and direction.It is estimated by the numerical simulation that the maximum vertical exchange mass of arsenic is 457.2 mg/d in rainy season and 191.3 mg/d in dry season and the maximum horizontal exchange mass of arsenic is 4380.0 and 1385.6 mg/d in rainy and dry season,respectively.

关 键 词：地表水 地下水 砷 地下水流模型 江汉平原 环境工程 

分 类 号：P66[天文地球—地质学]