同位素技术判定银川平原地下水补给模式  

Application of isotopic techniques identified groundwater recharge patterns in Yinchuan Plain

作　　者：于艳青[1,2] 余秋生[1,2] 薛忠歧[1,2] 尹秉喜[1,2] 

机构地区：[1]中国地质大学 [2]宁夏地质工程勘察院,宁夏银川750021

出　　处：《宁夏工程技术》2005年第3期208-212,共5页Ningxia Engineering Technology

基　　金：原地矿部地质勘查基金资助项目--宁夏银川平原农业生产基地地下水资源及环境地质综合勘察

摘　　要：应用同位素技术研究银川平原地下水特征表明:银川平原地下水具有不同的补给模式:贺兰山洪积扇的单一潜水主要接受大气降水及山前侧向径流补给,受补给源所限,地下水滞留时间较长,更新能力较差;引黄灌区内潜水,主要接受黄河灌溉水的入渗补给,其中青铜峡单一潜水地下水更新能力强于银川以北地区.平原深部承压水为古地质时期补给形成的“古水”,地下水交替缓慢;城市地下水集中开采区,承压水具备新老掺和及现代水的特征,开采层接受上覆含水层的越流补给,承压水地下水流速自开采区边缘向开采中心增快.The results of groundwater isotope analysis showed that： the groundwater in Yinchuan Plain had different recharge patterns; the phreatic groundwater in the diluvial fan in front of the Helan Mountain was mainly recharged by lateral flow from Helan Mountain and precipitation; its residence time was longer and renewal was lower by the recharge capacity; the phreatic groundwater in the irrigated area was mainly recharged by the influent seepage of irrigation by the Yellow River; the renewal of phreatic groundwater in the diluvial fan of Qingtongxia gorge was better than the fluvial plain; the deep confined water mainly consisted of palaeowater which was recharged in the past; its recycle was slow; the deep confined water consisted of the new and old water in the urban area where groundwater was concentrate exploiting, and recharged by the upper water; and the velocity of flow in the center of pumping area was faster than the brim.

关 键 词：同位素 银川平原 地下水 补给 

分 类 号：P592[天文地球—地球化学] P597[天文地球—地质学]