摘要
通过环境同位素及其Tamers、IAEA模型应用研究表明,黑河流域平原区地下水补给及更新与古气候变化密切相关,8000～5000 a BP、3500～2500 a BP和近1000年以来的多雨期是主要补给期;潜水较年轻又更新快,承压水较老又更新慢;东部地下水更新较快,西部更新较慢;祁连山前戈壁带地下水更新较快,细土平原更新较慢;近河道带地下水更新速率大,远离河道则小.东部以山区降水通过出山地表径流补给为主,西部冰川雪融水和山区基岩裂隙水是主要补给源.因此,遵循地下水补给与更新的自然规律,与地表水联合优化调控,有利于该区地下水可持续利用及下游区生态环境保护.
Based on field investigations by such means as environmental isotopic features, Tamres model and IAEA model, it is held that the groundwater recharge and renewable rate is related to paleoclimatic variation and that the rainy stages of 8000～5000 a BP, 3500～2500 a BP and last 1000 years are the main groundwater recharge stages in Heihe River basin in Northwest China. The shallow groundwater is relatively young and its renewable rate is greater than that of the confined groundwater. The renewable rate in the eastern area of the middle reaches is greater than that in the western area. The rate is less in the fine soil zone than in the gobi zone under the Qilian Mountain, and the rate is greater near the riverbed than far from the riverbed. The main recharge source of groundwater in the eastern area of the middle reaches is the rain from the Qilian Mountain area, whereas in the western area the source is the snowmelt and the crevice groundwater from the mountain area. It is therefore concluded that by adhering to the natural recharge and renewable regularity of groundwater and regulating and controlling groundwater and surface water in a optimal way, the sustainable utilization of groundwater can be achieved, and the ecological environment can be better protected.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2006年第4期341-348,共8页
Acta Geoscientica Sinica
基金
国家自然科学基金项目(编号:40472126)
国土资源部重点基础研究项目(编号:200010301)资助
关键词
黑河流域
地下水
同位素特征
古气候
更新性
Heihe River basin groundwater isotopic characteristics paleoclimate renewable rate
