Isotope study of moisture sources, recharge areas, and groundwater flow paths within the eastern Batinah coastal plain, Sultanate of Oman
Isotope study of moisture sources, recharge areas, and groundwater flow paths within the eastern Batinah coastal plain, Sultanate of Oman
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DOI：
10.1029/2000wr000149
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发表时间：
2002-10
影响因子：
5.4
通讯作者：
C. Weyhenmeyer;S. Burns;H. Waber;P. G. Macumber;A. Matter
中科院分区：
文献类型：
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作者：
C. Weyhenmeyer;S. Burns;H. Waber;P. G. Macumber;A. Matter
1995年至1998年期间在阿曼北部Batinah沿海平原东部收集的降雨样本的氧和氢同位素分析表明，该地区降水的两个不同的主要水汽来源：北部的地中海来源和南部的印度洋来源。结果，为研究区域确定了两条新的当地大气水线。对200多个泉水和水井的地下水样本进行的同位素分析表明，Batinah沿海冲积含水层的主要水源是来自邻近Jabal Akhdar山脉的高海拔降水，源于南北湿气源的结合。在高海拔地区补给的地下水形成了两股水柱，它们的重同位素18O和2H被耗尽，从山脉穿过沿海平原延伸到海洋，从而在水平和垂直方向上保持化学均匀性，直至深度超过300米。相比之下，在这两个羽流附近的地区，冲积含水层是地球化学分层的。在海岸附近，盐水入侵导致氯化物浓度和同位素值的突变。
Oxygen and hydrogen isotope analyses of rainfall samples collected on the eastern Batinah coastal plain of northern Oman between 1995 and 1998 indicate two different principal water vapor sources for precipitation in the area: a northern, Mediterranean source and a southern, Indian Ocean source. As a result, two new local meteoric water lines were defined for the study area. Isotopic analyses of groundwater samples from over 200 springs and wells indicate that the main source of water to the Batinah coastal alluvial aquifer is high‐altitude rainfall from the adjacent Jabal Akhdar Mountains, originating from a combination of northern and southern moisture sources. The groundwater recharged at high‐altitude forms two plumes of water which is depleted in the heavy isotopes 18O and 2H and stretches from the mountains across the coastal plain to the sea, thereby retaining a chemical homogeneity horizontally and vertically down to a depth exceeding 300 m. In contrast, in areas adjacent to these two plumes the alluvial aquifer is geochemically stratified. Near the coast, saline intrusion results in abrupt changes in chloride concentrations and isotope values.