摘要
黑河下游额济纳盆地位于西北内陆干旱区，大部分地区为戈壁沙漠，降水稀少，蒸发强烈，生态环境脆弱。盆地内天然植被的生长发育主要依靠于区域地下水，研究盆地地下水形成和循环机制，对流域治理、生态环境建设具有重要意义。本文采用环境同位素示踪技术，结合水化学分析方法和区域水文地质条件，研究分析了盆地地下水循环特征、地下水与地表水的相互关系和流域不同地区地下水补给来源等，为黑河下游水利工程规划和水量调度提供科学依据。
Ejin Basin with low precipitation but high evaporation, is located in the lower reaches of the Heihe River in northwest China. Most of the basin is desert where the ecosystems are vulnerable. The growth of vegetations in the basin relies mainly on regional groundwater, and the Heihe River is a main recharge source of groundwater. It is significant to understand the formation and circulation of groundwater for planning water conservancy projects and redistributing water resources in the lower reaches. In this paper, the behaviors of groundwater beneath the Ejin Basin are researched by using hydrochemistry and isotope-tracing technology based on considering the regional hydrogeologic conditions. Hydrochemical and environmental isotopic data are analyzed so as to reveal the interaction between surface water and groundwater and the recharge resources of groundwater in the different regions in the basin. The results show that the distribution characteristics of hydrochemistry and isotopes are different from the different locations because of the different structures of aquifers, formation conditions, recharge resources and flow paths of groundwater beneath the basin. The stable isotopic composition of stream water is similar to that of shallow groundwater near the river channel, and the shallow groundwater is very young based on the tritium and CFC data, these reveal that the properties of shallow groundwater are closely related to the stream water, and groundwater is mainly recharged by the Heihe River rising from the Qilian Mountains. The stable isotopic composition of groundwater beneath Gurinai, where the evaporation is violent, is different from that of stream water and shallow groundwater near the river channel, and the tritium and CFC data show that groundwater here is young, which indicate that groundwater beneath Gurinai could be recharged by local rainfall and from the Badain Jaran Desert. The stable isotopic composition of deep confined groundwater beneath a zone between the Juyan Lake and the China-Mongoli
出处
《干旱区地理》
CSCD
北大核心
2005年第5期574-580,共7页
Arid Land Geography
基金
国际原子能机构(IAEA) 2003-2004年技术项目(TC Project)(CPR/08/015/)资助
关键词
黑河
额济纳盆地
稳定同位素
CFC
电导率
地下水来源
the Heihe River
Ejin Basin： stable isotope
CFC
electrical conductivity
groundwater resources
