河西走廊黑河流域地下水化学特征研究  

Hydrochemical Characteristics of Groundwater of the Heihe Basin in the Hexi Corridor, Gansu Province

作　　者：白福 杨小荟[2] 

机构地区：[1]甘肃水文地质工程地质勘察院,甘肃兰州730020 [2]石家庄经济学院,河北石家庄050031

出　　处：《西北地质》2007年第3期105-110,共6页Northwestern Geology

基　　金："十五"国土资源部重点科技计划顶目(200010303)

摘　　要：黑河流域地处西北内陆干旱区,受径流蒸发和溶滤作用的控制,地下水水化学最重要的特征是自补给区至排泄区具有典型的水平分带性和垂直倒置分异规律。水平方向从祁连山山前洪积扇顶部到冲、洪积细土平原北部的盐沼(盐地),表层地下水的矿化度随着径流长度的增加而增高,由淡水过渡为咸水并达到卤水阶段,化学组分亦相应的由HCO3--Na+-Ca+型递变为SO42--HCO3--Na+-Ca2+型、SO42--Cl--Na+-Ca2+型直到Cl--SO42--Na+型、Cl--Na+型,每个水化学带与一定的地貌单元相联系。垂向上在淡承压水分布的区域,上部潜水矿化度0.5～4.0g/L,下部承压水矿化度小于1g/L,且随着深度的增加矿化度降低。The Heihe basin is located in the inland arid district, northwest China. Controlled by surface runoff evaporation and percolation, the hydrochemistry of groundwater is characterized by the horizontal zonation and vertical upside-down differentiation from the supply sources to the discharge area. Horizontally , from the top of pluvial fans in the front of the Qilian mountains to the salt marsh （salt land） in the north of the alluvial-pluvial plain made up of by soil, the mineralization degree of the top layers of groundwater becomes higher as the runoff length increases , accompanied by fresh water to salt water and even to brinestage. Accordingly, the chemical components gradually change from HCO3^--Na^＋-Ca^2＋ type to SO^2-4-HCO^-3-Na^＋-Ca^2＋ and SO^2-4-C1^--Na^＋-Ca^2＋ types , and then became CI^--SO^2-4-Na^＋ and CI^--Na^＋ types, and during the change, each hydrohemical zone is closely related to a certain geomorphical unit. Vertically, in fresh water of unconfined aquifer, the mineralization degree decreases as the depth increases, in the top is about 0.5-4.0g/L, while in water of confined aquiferit becomes lower than 1 g/L.

关 键 词：地下水水化学 水平分带 垂直分异 干旱内流盆地 

分 类 号：P641.3[天文地球—地质矿产勘探]