摘要
为了查明苏北阜宁县潜水和承压水的水化学成因和补给特征,文章采集区域内地表水、潜水、承压水(第Ⅱ、第Ⅲ、第Ⅳ承压水)的水样,结合数理统计分析、Piper三线图、Gibbs模型和水化学特征系数等手段,分析了不同水体的氢氧同位素关系和矿化度分布、主要阴阳离子关系、水化学特征。结果表明:①阜宁县地下水总体为弱碱性,潜水和承压水中阳离子质量浓度都呈现Na^(+)>Ca^(2+)>Mg^(2+)>K^(+),潜水中阴离子质量浓度呈现HCO_(3)^(-)>Cl^(-)>SO_(4)^(2-)>NO_(3)^(-),第Ⅱ、第Ⅲ、第Ⅳ承压水中阴离子质量浓度皆呈现出HCO_(3)^(-)>SO_(4)^(2-)>Cl^(-)>NO_(3)^(-);潜水的总溶解固体(TDS)比第Ⅱ、第Ⅲ、第Ⅳ承压水偏高,局部区域的潜水为微咸水和咸水,第Ⅱ、第Ⅲ、第Ⅳ承压水的水质明显优于潜水。②地下水的补给与大气降水相关,潜水为现代降水补给,第Ⅱ、第Ⅲ、第Ⅳ承压水源于晚更新世或者更早时期的降水补给。③地下水水化学特性受降水影响较小,主要受到水岩作用、阳离子交换作用控制,其中第Ⅱ、第Ⅲ、第Ⅳ承压水的盐分主要来源于硅酸盐岩风化,人类活动对地下水化学组分影响相对较弱。
For investigating hydrochemical evolution and recharge characterisitcs of the groundwater in Funing County,northern Jiangsu Province,the study collected various water samples from regional surface water,phreatic water and confined water(theⅡ,ⅢandⅣconfined water)and analyzed their hydrogen and oxygen isotopes(δ18 O-δD)relations,distributive rules of water salinity,major ions’relations and hydrochemical characteristics in combination of mathematical statistical analysis,Piper three-line diagram,Gibbs model and hydrochemical characteristic coefficient.The results show that:①the groundwater in Funing is weakly alkaline in general,mass concentration of cations in both phreatic water and confined water are distributed in the sequence of Na^(+)>Ca^(2+)>Mg^(2+)>K^(+);those of anions in the phreatic water presents as HCO_(3)^(-)>Cl^(-)>SO_(4)^(2-)>NO_(3)^(-)while that in theⅡ,ⅢandⅣconfined water presents as HCO_(3)^(-)>SO_(4)^(2-)>Cl^(-)>NO_(3)^(-);The total dissolved solids(TDS)of the phreatic water is relatively higher than that of theⅡ,ⅢandⅣconfined water,with locally brackish and saline water;The water quality in the confined area is significantly better than that in the phreatic area.②The groundwater recharge in the study area is related to the atmospheric precipitation.The phreatic water is closely associated with modern precipitation while theⅡ,ⅢandⅣconfined water mainly sourced from precipitation replenishment in Late Pleistocene or even earlier;③The chemical characteristics of groundwater in the region are less affected by precipitation and more controlled by water rock interaction and cation exchange,among which the salinity of theⅡ,Ⅲ,andⅣconfined water mainly come from the weathering of silicate rocks,and human activities have slight impact on the chemical composition of the groundwater.
作者
陶小虎
王赫生
龚建师
许乃政
檀梦皎
胡小雨
戴飞虎
孟显超
朱春芳
周锴锷
李亮
TAO Xiaohu;WANG Hesheng;GONG Jianshi;XU Naizheng;TAN Mengjiao;HU Xiaoyu;DAI Feihu;MENG Xianchao;ZHU Chunfang;ZHOU Kaie;LI Liang(Nanjing Center,China Geology Survey,Nanjing 210016,Jiangsu,China;Water Resources Service Center of Jiangsu Province,Nanjing 210029,Jiangsu,China;Funing Bureau of Natural Resources and Planning,Yancheng 224400,Jiangsu,China;Key Laboratory of Watershed Eco-Geological Processes,Ministry of Natural Resources,Nanjing 210016,Jiangsu,China)
出处
《华东地质》
CAS
2023年第3期357-366,共10页
East China Geology
基金
中国地质调查局“长江下游及淮河流域水文地质与水资源调查监测(编号:DD20221756)”
“淮河南系水文地质与水资源调查监测(编号:DD20230428)”项目联合资助。
关键词
阜宁县
地下水
水化学特征
氢氧同位素
水化学成因
Funing County
groundwater
hydrochemical characteristics
hydrogen and oxygen isotopes
hydrochemical genesis
