摘要
干旱、半干旱地区的地下水资源是重要的供水水源,阿克苏地区地处塔里木盆地北部,天山山脉中段南麓,人类活动密集,中部及东部荒漠的土壤盐渍化严重,地下水水质出现恶化,广泛分布着微咸水和咸水,为了合理开发利用地下水资源,需要深入地认识阿克苏河流域地下水的水化学特征和演化规律,对此,在收集阿克苏地区气象、水文、地质、水文地质等资料的基础上,系统采集了不同位置和深度的地下水样品,对水化学组分进行测定,确定了地下水水化学类型;结合水文地质调查结果,分析了阿克苏地区地下水化学组分的空间特征,推断其水文地球化学演化过程。结果显示,浅层地下水在径流区的阳离子以Na^(+)、Ca^(2+)为主,阴离子以Cl^(-)、SO_(4)^(2-)为主,至排泄区阳离子变成以Na^(+)为主,阴离子以Cl^(-)、SO_(4)^(2-)为主;中深层地下水在径流区的阳离子以Na^(+)、Ca^(2+)为主,阴离子以Cl^(-)、SO_(4)^(2-)为主,至排泄区优势阳离子转为Na^(+),优势阴离子转为Cl^(-)。阿克苏地区地下水中发生的主要水文地球化学作用为水-岩相互作用,同时也受人为因素和混合作用的影响。
The Aksu River basin as arid and semi-arid areas lies in the north of the Tarim basin where salt water and low-salt water are widely distributed,worsening the quality of groundwater.This study systematically collects and analyzes groundwater samples from different locations and depths of Aksu Prefecture groundwater,identifies the chemical types of groundwater,analyses the spatial characteristics of the chemical composition and infers the evolution of its hydrologic geochemistry.The results indicate that cations in shallow groundwater in the runoff zone are mainly Na^(+) and Ca^(2+)and anions are mainly Cl^(-)and SO_(4)^(2-),cations in shallow groundwater in discharge area are mainly Na^(+),and anions are mainly Cl-and SO_(4)^(2-);cations in middle-deep groundwater in the runoff zone are mainly Na^(+)and Ca^(2+)and anions are mainly Cl^(-)and SO_(4)^(2-),cations in shallow groundwater in discharge area are mainly Na^(+),and anions are mainly Cl^(-).Major hydrologic geochemistry occurring in Aksu Prefecture groundwater is water-rock interaction influenced by human factors and by a mixture of factors.
作者
郑哲文
高攀
李志伟
魏文豪
史少飞
周帅
ZHENG Zhe-wen;GAO Pan;LI Zhi-wei;WEI Wen-hao;SHI Shao-fei;ZHOU Shuai(Regional Geological Surveying Team,BGEEMRSP,Chengdu 610213)
出处
《四川地质学报》
2021年第S01期131-137,共7页
Acta Geologica Sichuan
关键词
干旱内陆区
地下水
水化学特征
水文地球化学
arid and semi-arid area
groundwater
hydrochemical characteristics
hydrologic geochemistry
Aksu Prefecture
