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天津市滨海区深层淡水,亦即咸水体之下Ⅱ、Ⅲ组承压含水层赋存的地下水为古代入渗水。由于超采地下水,在区域水位降落的基础上,又于集中开采区形成了数个迭加的降落漏斗,随着产生地面沉降,最后导致水质恶化。本文论述了水质恶化的原因是粘性土排水固结、可溶盐随粘性土压缩释水进入含水层的结果。地下水中氟超标属于自然环境,开采地下水所引起的水中氟和其他化学指标的增加属于人为环境,所以水中氟超标具有二重性。
The deep fresh water in the coastal area of Tianjin Municipality, that is, the underground infiltrated water in the confined aquifers of Group Ⅱ and Ⅲ under the saltwater body is the ancient infiltration water. Due to the over-exploitation of groundwater, on the basis of land-level water level drop, several superimposed landing funnels are formed in the centralized mining area, which eventually leads to the deterioration of water quality as land subsidence occurs. This paper discusses the reasons for the deterioration of water quality due to the consolidation of the drainage of clay, the dissolution of soluble salt into the aquifer with the compression and release of clay. Excessive fluorine in groundwater belongs to the natural environment. The increase of fluorine and other chemical indicators in the water caused by exploitation of groundwater belongs to the man-made environment, so the excessive fluorine in water has duality.