人工补给对含水层水质的影响

为了研究人工补给对含水层水质的影响问题,通过反向地球化学模拟方法对大庆西部地下水水质演化规律进行了分析。结果表明,地下水化学成分主要受含水层矿物相的溶解-沉淀作用、阳离子交换吸附作用以及氧化还原作用的影响,并确定方解石、白云石、盐岩、萤石、石膏、赤铁矿、菱铁矿、软锰矿、二氧化碳、阳离子交换剂等为影响地下水化学成分的控制性(矿)物相。在此基础上,采用正向地球化学模拟方法,以大庆市西水源地下水人工补给为例,模拟了地表水进入到地下后与含水层中原有的地下水以及含水层介质发生的水-岩相互作用。模拟结果表明,注入水与含水层中的水混合后,使地下水的矿化度有所降低,且混合水中地表水所占比例越大,地下水的矿化度越低;注入水与含水层中的地下水混合后,不会导致地下水水质的突变和水质级别的降低,还可在一定程度上改善含水层水质。

Influence of Artificial Recharge on Groundwater Quality

In order to study the effect of artificial recharge on the groundwater quality,the evolvement law of groundwater quality in Western Daqing City was firstly studied by using inverse geochemistry simulation method.The results showed that the groundwater quality was affected by dissolve-precipitation of aquifer minerals,alternate adsorption of cation and redox function.The dominative mine-rals in aquifer are calcite,dolomite,halite,fluorite,gypsum,hematite,siderite,pyrolusite,carbon dioxide and cation exchanger.Based on the above work,a water-rock interaction case among Nenjiang River water,groundwater of Xi-waterwork and aquifer minerals in western Daqing City was studied through forward geochemistry simulation method.The results showed that the TDS of mixing water will decrease,the more surface water quantity in mixing water,the lower TDS of mixing water.The artificial recharge water will not lead to catastrophe or decrease of water quality in aquifer,and it will improve water quality in aquifer to some extent.