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首页> 外文期刊>Arabian Journal for Science and Engineering. Section A, Sciences >USING ENVIRONMENTAL ISOTOPES FOR ESTIMATING THE RELATIVE CONTRIBUTIONS OF GROUNDWATER RECHARGE MECHANISMS IN AN ARID BASIN, CENTRAL SAUDI ARABIA
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USING ENVIRONMENTAL ISOTOPES FOR ESTIMATING THE RELATIVE CONTRIBUTIONS OF GROUNDWATER RECHARGE MECHANISMS IN AN ARID BASIN, CENTRAL SAUDI ARABIA

机译：使用环境同位素估算中沙特阿拉伯干旱盆地干旱地下水补给机制的相对贡献

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摘要

Stable isotope compositions of water (~2H and ~(18)O) were utilized to estimate the relative contributions of diffused recharge (DR) through the soil matrix from direct precipitation and concentrated recharge (CR) through coarse-textured ephemeral streambeds to groundwater in the arid granitic basin of Alquway, central Saudi Arabia. Groundwater ranged in its stable isotope composition from -2.51per thousand to -2.03per thousand for δ~(18)O and from -12.7per thousand to -10.1per thousand for δ~2H. Local groundwater line (LGWL) is defined by: δ~2H = 4.72 δ~(18)O - 0.57. Average stable isotopic content of CR is -2.58per thousand for δ ~(18)O, and -12.37per thousand for δ ~2H. Local CR line (LCRL) is given by: δ~2H = 5.28 δ~(18)O + 1.24. Its slope indicates that CR experiences significant kinetic fractionation resulting in a greater relative enrichment of ~(18)O than ~2H. DR is more enriched in the heavy isotopes with means of -0.38per thousand for δ~(18)O and -9.8per thousand for δ~2H. Local DR line (LDRL) is given by: δ~2H = 2.01 δ~(18)O -9.03. Its slope is much lower than that of LCRL, indicating that DR goes through more stable isotopic fractionation than CR, due to experiencing more evaporation from unsaturated soils. Recharge-inducing rainfalls in this basin were estimated to be relatively depleted in the heavy isotopes, suggesting that groundwater recharge in this basin originates only from heavy downpours. Using mean values of δ ~(18)O in a mass-balance equation, the relative contributions of CR and DR, to groundwater were estimated to be 84% and 16%, respectively.
机译：利用稳定的水同位素组成（〜2H和〜（18）O）估算从土壤中扩散补给（DR）的相对贡献，从直接降水和通过粗纹理的短暂河床到地下水的浓缩补给（CR）。沙特阿拉伯中部阿尔奎威（Alquway）干旱的花岗岩盆地。地下水的δ〜（18）O稳定同位素组成为-2.51 /千至-2.03 /千，δ〜2H为-12,000至-10.1 /千。局部地下水线（LGWL）定义为：δ〜2H = 4.72δ〜（18）O-0.57。 δ〜（18）O的CR平均稳定同位素含量为-2.58 /千，δ〜2H为-12.37 /千。局部CR线（LCRL）由以下公式给出：δ〜2H = 5.28δ〜（18）O + 1.24。它的斜率表明CR经历了显着的动力学分级分离，导致〜（18）O的相对富集程度大于〜2H。 DR在重同位素中含量更高，对于δ〜（18）O为-0.38 /千，对于δ〜2H为-9.8 /千。局部DR线（LDRL）由以下公式给出：δ〜2H = 2.01δ〜（18）O -9.03。它的斜率比LCRL的斜率低得多，表明DR经历了比CR更稳定的同位素分馏，这是由于经历了来自非饱和土壤的更多蒸发。据估计，该盆地的重同位素中消耗补给的降雨相对枯竭，这表明该盆地的地下水补给仅源于倾盆大雨。使用质量平衡方程中的δ〜（18）O平均值，CR和DR对地下水的相对贡献分别估计为84％和16％。

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