格尔木河流域平原区地下水同位素及水化学特征
Isotopic and Hydrochemical Characteristics of Groundwater in the Golmud River Basin
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摘要: 通过对格尔木河流域天然水中H、O同位素的系统分析,根据地球水化学组分循环演化规律所对应流域不同类型水体的同位素组成的研究,结果表明流域地下水化学组分随流程增加溶滤作用增强,地下水中HCO3-逐渐减少,Cl-则增加.运用δD、δ18O和3H值建立了流域大气降水线方程,确定了山区河水非当年降水补给,河水以地下水补给为主、其次是冰雪融水和大气降水补给.山区降水δD、δ18O均值低于平原区,表明平原区降水受蒸发作用影响水中富重同位素.平原区地下水中的δD、δ18O值与河水基本一致,说明平原区地下水主要受河水出山后入渗补给.承压自流水δD和δ18O值与潜水基本一致,根据地下水的3H值确定早于潜水年龄,且随埋深增加δD、δ18O值减少的趋势,其年龄亦由新变老.Abstract: On the basis of rule of hydr ochemical components cycling in the corresponding drainage basins having different isotope compositions, H and O isotopes analysis for natural water in the Golmud River basin, indicates that lixiviation of groundwater chemical components is strengthened, HCO3- decreases gradually, and Cl- increases as flowing distance increases.By using DD, D18O and 3H to establish a linearequation for drainage basin atmosphere precipitation and confirm mountain rivers are not supplied in the current year and mainly supplied by groundwater and then by ice-snow melt and atmosphere precipitation.Averages DD and D18O values in the mountainous precipitation are lower than those in the plain areas.This indicates that the isotopes of precipitation in plain areas are influenced by evaporation and heavy isotopes are enriched.That the average DD and D18O values in mountainous precipitation are identical to those in the plain areasi shows that groundwater in plain areas is rechar ged by stream from mountains.The DD and D18O values of confined flow water are substantially similar with phreatic water.Age determined by 3H value is older than phreatic water, its age will change from young to old with increase of buried depth.
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Key words:
- groundwater /
- isotopes /
- hydrochemical characteristics
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