基于MODFLOW-NWT的尾矿库地下水环境影响评价  

Environmental Impact Assessment of Groundwater in Tailings Reservoir by Using MODFLOW-NWT

作　　者：莫欣岳 马卫东 李欢[3] 张镭[1] MO Xin-yue;MA Wei-dong;LI Huan;ZHANG Lei(Key Laboratory for Semi-Arid Climate Change of the Ministry of Education,College of AtmosphericSciences,Lanzhou University,Lanzhou,Gansu 730000,China;Gansu Environment and EngineeringAppraisal Center,Lanzhou,Gansu 730030,China;School of Information Science and Engineering,Lanzhou University,Lanzhou,Gansu 730000,China)

机构地区：[1]兰州大学大气科学学院,半干旱气候变化教育部重点实验室,甘肃兰州730000 [2]甘肃省环境工程评估中心,甘肃兰州730030 [3]兰州大学信息科学与工程学院,甘肃兰州730000

出　　处：《环境监测管理与技术》2018年第4期32-36,共5页The Administration and Technique of Environmental Monitoring

基　　金：国家自然科学基金资助项目(41475008);兰州大学中央高校基本科研业务费专项基金资助项目(lzujbky-2016-k06)

摘　　要：尾矿库渗滤液中污染物会对区域地下水产生不利影响。根据拟建工程场地水文地质条件和气象资料,建立三维数值预测模型并分析非正常工况下两种典型污染情景对地下水环境的影响,预测结果显示:特征污染物As的质量浓度随时间推移逐渐变大;防渗层破损和无防渗情况下污染晕沿地下水流方向最远运移距离在第100 d、1 000 d、7 884 d时分别为72 m、225 m、262 m和78 m、335 m、391 m。由于下游河流及周边泉点为区内地下水排泄主要途径,污染物经排泄进入下游河流将对环境造成较大影响,故提出相应防范措施。The pollutants in the leachate from tailings reservoirs have adverse effects on the regional groundwater. Based on the hydrogeological conditions and meteorological data at the planned engineering worksite, a three-dimensional numerical prediction model was established to analyze the influence of two typical pollution scenarios on the groundwater environment under abnormal conditions. The results showed that the mass concentration of the specific pollutant As gradually increased with time. Under damaged impermeable layer or no seepage control conditions, the farthest migration distance of the pollution plume along the groundwater flow direction on 100th day, 1 000th day and 7 884th day were 72 m, 225 m, 262 m and 78 m, 335 m, 391 m respectively. Since downstream river and the surrounding springs were the main drainage ways for groundwater, and discharged pollutants would have huge impacts on the downstream environment, some appropriate preventive measures were put forward.

关 键 词：尾矿库 水文地质模型 地下水环境 

分 类 号：P641[天文地球—地质矿产勘探] X824[天文地球—地质学]