Recharge source,hydrochemical characteristics and formation mechanism of groundwater in Nantong,Jiangsu Province
Recharge source,hydrochemical characteristics and formation mechanism of groundwater in Nantong,Jiangsu Province
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发表时间：
2011
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通讯作者：
Zhang Wen-jie
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作者：
Zhang Wen-jie
江苏沿海含水层地下水含盐量偏高，特别是南通部分地区由于经济发展大量使用。这一问题对区域水资源的影响很大，对生态环境和经济社会发展具有潜在的高度负面影响。通过对南通市浅层和深层承压含水层的地下水采样，确定了南通市地下水补给水源、水化学特征及水化学演化机制。大部分地区浅层总溶解固形物（TDS）高于深层，沿海地区高于内陆地区；中西部地区浅层地下水的TDS较低，但在沿海地区的一些特殊地区，TDS非常高。氧、氢同位素（D、O）和水化学系数表明，局地降水是浅层和深层含水层的补给源。古海相地层溶解盐是东部沿海地区深部承压地下水TDS增大的主要原因。中西部深层含水层水质总体较好，水化学演化为天然的水岩相互作用。周慧方等：江苏南通、阴阳、海盐等东南沿海地区地下水水化学特征表现出很高的TDS，一定程度上是海水入侵所致。在其他地区，蒸发浓缩和溶解地层盐是浅层水化学演化的主要模式。因此，应有效保护TDS较高的东部沿海地区深层含水层地下水，特别是阴阳、海盐等盐渍化地区。
Salinity of groundwater in the coastal aquifers of Jiangsu Province becomes high,especially in some areas of Nantong because of the heavy usage due to economic development.This problem has great impact on the regional water resources and it potentially has high negative effects on the ecological environment,economic and social development.Groundwater samples were collected from the superficial and deep confined aquifers of Nantong to identify the water recharge source,hydrochemical characteristics and evolution mechanism of water chemistry.The total dissolved solids(TDS) of the superficial aquifer is higher than the deep aquifer in most areas,and it is higher in the coastal areas than in inland areas;groundwater of the superficial aquifer in the central and western areas has a low TDS,but the TDS shows very high in some special areas near the coastal region.Oxygen and hydrogen isotopes(D,O) and hydrochemical coefficients indicate that the local precipitation is the recharge source of superficial and deep aquifers.Dissolving salts of ancient marine strata is the major cause that increases the TDS of the deep confined groundwater in eastern coastal areas.The water quality of the deep aquifer in central and western areas is good as a whole,and the hydrochemical evolution is the natural water-rock interaction.The superficial aquifer water in ZHOU Hui-fang et al.: Hydrochemical characteristics of groundwater in Nantong,Jiangsu Province Yinyang,Haiyan areas in southeastern coastal areas shows a very high TDS,to some extend due to seawater intrusion.In other areas,evapor-concentration and dissolving the salts of strata are the dominated hydrochemical evolution patterns of the superficial aquifer.Hence,the deep aquifer groundwater in eastern coastal areas where TDS is high should be protected effectively,especially the salified areas such as Yinyang and Haiyan.