杭嘉湖地区水化学及同位素特征初步分析

本文通过初步分析杭嘉湖地区地下水化学和同位素特征,认为地下水的水化学分布存在着一定的分带性。浅层地下水化学类型为Cl,HCO3-Ca,Na型,代表了降水或地表水补给的形成过程,且补给前受到不同程度的蒸发。深层承压水化学类型为HCO3-Ca,Na和HCO3-Na型,代表了以铝硅酸盐矿物溶解为主的形成过程,其补给源为古气候条件下的降水补给。利用氘过量参数d值判断了第承压水（120~150 m）总体流向为南西至北东,即由杭州和湖州向嘉兴方向径流。

A preliminary study on hydrochemical and isotope characteristics of groundwater in Hangjiahu area

The hydrochemical and isotope characteristics of groundwater in Hangjiahu area are preliminarily studied in this paper.It is concluded that the hydrochemistry distribution of underwater in this area shows a certain zonation.The chemical types of shallow groundwater are of Cl,HCO3-Ca and Na types,representing the formation process of precipitation and surface water recharge.The chemical types of deep confined water are of HCO3-Ca,Na and HCO3-Na types,representing the dissolution process of aluminosilicate-dominated minerals,its recharge source is precipitation accompanied by evaporation in different degrees before recharge in environment of paleoclimate.By analyzing the deuterium excess parameter （d value）,it is believed that the general flow direction of No.Ⅱ confined water（120～150 m） is southern-western to northern-eastern direction,that is,the runoff direction from Hangzhou to Jiaxing.