陇东黄土高原第四系潜水系统特征

Quaternary Diving System Characteristics in Gansu Loess Plateau

陇东黄土高原第四系潜水系统分为黄土潜水系统和河谷潜水系统,黄土潜水系统又分为黄土塬区潜水、黄土丘陵区潜水。分析了黄土潜水系统和河谷潜水系统的赋存特征、补径排条件、动态特征等。结果表明:大气降水是黄土潜水的主要补给来源,潜水的TDS和总硬度年际间变化均不大,水质普遍较好,是该区居民的主要饮用水源;河谷潜水主要接受大气降水的垂直补给、地表水的入渗补给、沟谷潜水的侧向补给、灌溉回归水的补给及基底白垩系地下水的越流补给,潜水水质均较好,TDS一般小于1.0 g/L,是河谷区人畜饮用水和城镇供水的主要水源。

Quaternary diving system is divided into loess diving system and valley diving system in Gansu Loess Plateau.Loess diving system is also divided into loess plateaus diving and loess hills diving.This article analyzed the occurrence characteristics,recharge runoff and discharge conditions,as well dynamic characteristics with regard to loess diving system and valley diving system.The results show that precipitation is the main supply source of loess diving,TDS and total hardness variation between years are not large,the water quality is generally good,and it is the main source of drinking water for local residents.Valley diving accepts mainly vertical replenishment of atmospheric precipitation,surface water recharge,valley diving supply.At the same time it accepts irrigation recharge and Cretaceous groundwater flow supply.The water quality is better,TDS is generally less than 1.0 g / L,and it is the main water source for people,livestock drinking,as well the main source of urban water supply.