天津市咸水区深层地下淡水资源可恢复性研究  

Recoverability of Deep Fresh Groundwater Resources in the Saline Water Area of Tianjin Municipality

作　　者：王亚斌[1,2] 邵景力[1] 王家兵[2] 崔亚莉[1] 

机构地区：[1]中国地质大学水资源与环境学院,北京100083 [2]天津市地质调查研究院,天津300191

出　　处：《资源科学》2010年第6期1188-1195,共8页Resources Science

基　　金：中国地质调查局项目:"华北平原地下水可持续利用调查评价(天津)"(编号:200310400003)

摘　　要：本论文的目的是研究天津市咸水区深层地下淡水各含水组的补给特征及地下水资源的可恢复性,为工作区地下水资源的准确评价和科学利用提供基础,采用的技术方法包括地下水位动态监测及统测、地面沉降及分层标监测、地下水质及同位素取样分析、深层淡水资源均衡计算。研究表明:天津市咸水分布区浅部咸水具有向下伏深层淡水越流补给的水动力特征,但深层淡水矿化度并未表现出明显上升趋势。越流补给在天津市区第Ⅱ含水组形成了一个14C年龄较小的区域。越下层的含水组地下水开采量越小,但地下水位下降幅度越大。第Ⅱ、Ⅲ含水组开采量占总开采量的68%,引起50.2%的地面沉降量,第Ⅳ及以下含水组开采量占总开采量的28%,引起40%的地面沉降量。第Ⅱ、Ⅲ含水组开采量中越流补给量所占比例达51.3%,第Ⅳ及以下含水组开采量中越流量所占比例仅占12.5%而挤压释水量所占比例高达67.8%。由此可见,天津市咸水区第Ⅱ、Ⅲ含水组深层淡水具有一定的可恢复性,越流为主要补给项;第Ⅳ、Ⅴ含水组地下水的补给能力明显的减弱,资源可恢复性差。Exploration of deeply-buried fresh water has played a cruel role in water supply for a long period in the saline covered area of Tianjin Municipality,China,where alternating unconsolidated alluvial-lacustrine and marine deposits are over 1000 m depth.In the meanwhile,the over-exploration has caused serious geological risks,such as land subsidence and potential contamination of deep fresh water.In this context,there are some points of view raised that deep fresh water exists in a close system and has no recharge;therefore its pumping should be prohibited.The purpose of this paper was to provide scientific basis for evaluation and sustainable exploitation of deeply-buried groundwater resources through studying its recharge conditions and recoverability under the saltwater area of Tianjin.Several approaches were adopted,including groundwater regime monitoring,land subsidence measurements and layed-formation settlement monitoring,sampling analysis of groundwater quality and isotope,and computation of deep fresh groundwater budget.Results showed that hydrodynamic characteristics were essentially obvious,demonstrated by that the deep fresh groundwater was recharged by the shallow salt water,and up to now,the total dissolved solids （TDS） of the deep fresh groundwater were not found increased greatly.In addition,there was an area in the II water bearing formation,where the age of 14C was relatively younger due to seepage recharge.Even though less quantity of groundwater could be pumped as depth increases,more groundwater levels decreased.Finally,the quantity of withdrawal of No.2 and 3 aquifer groups accounted for 68% of the total withdrawal,but it led to 50.2% of land subsidence.On the other hand,the quantity of withdrawal of No.4 and deeper aquifer groups accounted for 28% of the total withdrawal;however,it led to 40% of land subsidence.As to the sources of groundwater of various water bearing formations,the leakage recharge of No.2 and 3 aquifer groups took up 51.3% with respect to its quantity of withdrawal,the l

关 键 词：地下水可恢复性 补给条件 同位素 地面沉降 挤压释水 天津市 

分 类 号：P641.8[天文地球—地质矿产勘探]