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首页> 外文学位 >Chemical and isotopic investigation of groundwater in eastern United Arab Emirates (UAE).
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Chemical and isotopic investigation of groundwater in eastern United Arab Emirates (UAE).

机译：阿拉伯联合酋长国东部（UAE）地下水的化学和同位素调查。

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UAE is located at the southeast of Arabian Peninsula. Two main aquifers occupy the study area: the Eastern Gravel Plain and Ophiolite aquifer. Increasing salinity of groundwater and depletion of aquifers are a major concern in the UAE. Previous studies suggest that groundwater, particularly in the Eastern Gravel Plain aquifer, is affected by seawater intrusion and evaporation. Isotopes of oxygen, hydrogen, carbon and chlorine, and chemical analyses were used to investigate this problem in detail. Samples of groundwater from the Eastern Gravel Plain aquifer have R36Cl values in the range of 13.3 to 17.4 x 10-15 while those from the Ophiolite aquifer have R36Cl values in the range of 20 to 118 x 10-15. These values indicate the presence of bomb-produced 36Cl and are consistent with recent (post 1950) recharge of most of the samples.; deltaD - delta18O relationship plots on a typical evaporation line, which suggests potential primary and secondary evaporation of the recharging waters prior to infiltration. The R36Cl values of the coastally-bound Eastern Gravel Plain aquifer are lower than the Ophiolite aquifer. Seawater intrusion is absent or minimal based on oxygen-hydrogen isotopes, R36Cl and Cl/Br ratio. Measurements of bromide concentrations support the contention that organically bound Cl is being released into this environment. Agricultural practices, which are extensive in this region, are a possible source.; Samples of groundwater from Eastern Gravel Plain aquifer have delta 13C and DIC values in the range of -10 to -17‰ and 12 to 100 mg C/l respectively. While samples from Ophiolite aquifer have delta 13C and DIC values in the range of -11 to -16.4‰ and 16 to 114 mg C/l respectively. The calculated delta13C of CO2 source ranges from -16.6 to -24.3‰ and -18.4 to -23.2‰ with an average of -20.5 and -20.8‰ for Eastern Gravel Plain and Ophiolite aquifers respectively. This suggests that the control on DIC is via soil cover vegetated by C-3 and C-4 plants.
机译：阿联酋位于阿拉伯半岛的东南部。研究区有两个主要含水层：东部砾石平原和蛇绿岩含水层。地下水盐度的增加和含水层的枯竭是阿联酋的主要关注点。先前的研究表明，地下水，特别是东部砾石平原含水层中的地下水，受到海水入侵和蒸发的影响。氧，氢，碳和氯的同位素以及化学分析被用来详细研究这个问题。来自东部砾石平原含水层的地下水样品的R36Cl值在13.3至17.4 x 10-15之间，而来自蛇绿岩含水层的地下水的R36Cl值在20至118 x 10-15范围内。这些值表明存在炸弹生产的36Cl，并且与大多数样品的近期（1950年后）补给量一致。 deltaD-delta18O关系图绘制在典型的蒸发线上，这表明渗透之前补给水的潜在一次和二次蒸发。东海岸的砾石平原含水层的R36Cl值低于蛇绿岩含水层的R36Cl值。根据氧-氢同位素，R36Cl和Cl / Br的比率，海水入侵很少或很少。溴化物浓度的测量支持了有机键合的Cl被释放到该环境中的争论。该地区广泛的农业实践是可能的来源。来自东部砾石平原含水层的地下水样品的δ13C和DIC值分别在-10至-17‰和12至100 mg C / l的范围内。来自蛇绿岩含水层的样品的δ13C和DIC值分别在-11至-16.4‰和16至114 mg C / l的范围内。计算得出的CO2源的δ13C范围为-16.6至-24.3‰，-18.4至-23.2‰，东部砾石平原和蛇绿岩含水层的平均值分别为-20.5和-20.8‰。这表明对DIC的控制是通过C-3和C-4植物的植被覆盖。

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