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长江河口地区第四系沉积体系的发育很大程度上受到海面波动的控制 ,其中地下水化学场也不可避免地受此影响 ,从而具有独特的演化模式。本文根据研究区的水文地质条件 ,划分出 3个含水系统 :全新统、中上更新统和下更新统含水系统 ;利用 Piper图解区分了更新统 2个含水系统中的水化学类型 ;同时探讨了地下水形成后所发生的演化。研究发现 ,区内地下水化学演化主要通 3三种作用进行 :1后期补给淡水对咸水的稀释作用 ;2地下水中钙离子对含水层沉积物中吸咐钠离子的交换作用 ;3不同类型地下水通过越流等形式发生的混合作用。另外 ,本区地下水中的 Ca2 +和 CO32 -离子对方解石来说已达过饱和。
The development of the Quaternary sedimentary system in the Changjiang estuary area is largely controlled by the fluctuation of the sea surface, and the chemical field of the groundwater is also inevitably affected by this, so that it has a unique evolutionary model. Based on the hydrogeological conditions of the study area, three aquifer systems were identified: Holocene, Middle-Upper Pleistocene and Lower Pleistocene aquifer systems; the Piper scheme was used to distinguish the hydrochemical types in the two systems; Evolution of groundwater after its formation. The study found that the chemical evolution of groundwater in the region mainly through the three kinds of three kinds of effects: 1 late dilute freshwater supply of saline water; 2 groundwater calcium ions in the aquifer sediment absorption of sodium ion exchange; 3 different types of groundwater Through the more flow and other forms of mixing effect. In addition, Ca2 + and CO32 - ions in groundwater in this area have reached saturation.