江苏盐城地区地下水水化学特征及形成机理

发布时间：2018-07-26 18:25

【摘要】：为了查明江苏盐城地区深层地下水咸化的主要影响因素,采集了不同类型水样(河水、浅层地下水、深层地下水和海水),通过对该地区不同水体的水化学特征、离子比值以及氘氧氚同位素组成进行分析,研究了盐城地区深层地下水水化学特征的形成机理。结果表明:浅层微咸水主要是溶解地层盐分和蒸发作用形成,而滨海港镇的部分地区受到一定程度的现代海水入侵影响。深层地下水总体为淡水,水化学演化以正常的水-岩作用为主,而深层微咸水主要分布在两个地区,一是东部滨海地区的灌河口至大丰一带,二是内陆地区的大丰市及其周边一带。滨海地区的深层微咸水主要是淋滤古海相地层盐分形成,黄沙港镇部分地区则受到轻微的现代海水入侵影响,而内陆地区的深层微咸水主要是浅层咸水下渗造成的。因此,盐城东部沿海矿化度增高的区域应大力加强对地下水的保护,特别是随着全球变暖,黄海海平面有上升的趋势,东部的滨海港镇等受海水入侵影响较大的区域更应引起高度重视。
[Abstract]:In order to find out the main factors affecting the salinization of deep groundwater in Yancheng area, Jiangsu Province, different types of water samples (river water, shallow groundwater, deep groundwater and seawater) were collected. The formation mechanism of hydrochemical characteristics of deep groundwater in Yancheng area was studied by analyzing ion ratio and deuterium oxygen and tritium isotopic composition. The results show that the shallow brackish water is mainly formed by salt and evaporation of dissolved strata, while some areas of Binhaigang Town are affected by modern seawater intrusion to some extent. The deep groundwater is mainly fresh water, the hydrochemical evolution is dominated by normal water-rock interaction, while the deep brackish water mainly distributes in two areas, one is the area from Guanhekou to Dafeng in the eastern coastal area, Second, the inland area of Dafeng City and its surrounding areas. The deep brackish water in the coastal area is mainly formed by leaching the salt in the paleo-marine strata, while in some areas of Huangshagang Town it is affected slightly by the modern seawater intrusion, while the deep brackish water in the inland area is mainly caused by the infiltration of the shallow brackish water. Therefore, the area with high salinity along the eastern coast of Yancheng should greatly strengthen the protection of groundwater, especially with the global warming, Huang Hai sea level has a rising trend. The coastal port town in the east should pay more attention to the area affected by seawater intrusion.
【作者单位】：江苏省地质调查研究院;国土资源部地裂缝地质灾害重点实验室;中国地质科学院水文地质环境地质研究所;
【基金】：中国地质调查局项目(1212011220005,12120114086601) 江苏省地勘基金项目(苏国土资函[2014]842号)~~
【分类号】：P641.3

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