Abstract

Iran and Iraq face a water shortage crisis especially in the recent decade. Hence, the regions with high potential water resources are highly important to these countries. Precipitation sampling for ¹⁸O and ²H analyses was conducted in 10 stations in the west of Iran and 2 stations in the east of Iraq during this study. Studying precipitation and its moisture sources using the backward trajectories of the HYSPLIT model, developing seasonal meteoric water lines (MWLs), and simulating the spatial variations of stable isotopes in precipitation using stepwise regression yielded valuable results regarding the hydrometeorology of the study region. The precipitation moisture sources in the study region were determined using the backward trajectories of the HYSPLIT model. These backward trajectories demonstrated the domination of various moisture sources including the Mediterranean Sea, the Black Sea, the Red Sea, and also the Persian Gulf in different seasons as reflected in the seasonal MWLs. In addition to moisture sources, the effects of meteorological parameters (temperature and precipitation amount) on the stable isotope content of precipitation also showed a notable correlation (with R² = 0.58 and 0.46, respectively). Surface water resources were also plotted on the developed seasonal MWLs, while some samples deviated from seasonal MWLs due to the evaporation effect.

摘要

伊朗和伊拉克面临水资源短缺危机，尤其是在最近十年中。因此，具有高潜在水资源的地区对这些国家来说非常重要。¹⁸ O和^2的降水采样在这项研究期间，在伊朗西部的10个站点和伊拉克东部的2个站点进行了H分析。利用HYSPLIT模型的后向轨迹研究降水及其水分源，建立季节性的大气水位线（MWLs），并使用逐步回归模拟降水中稳定同位素的空间变化，可得出有关研究区域水文气象的有价值的结果。使用HYSPLIT模型的后向轨迹确定了研究区域的降水水分源。这些向后的轨迹表明，不同季节，包括地中海，黑海，红海以及波斯湾在内的各种湿气源均处于主导地位，这体现在季节性MWL中。除了水分来源，² = 0.58和0.46）。在已开发的季节性MWLs上还绘制了地表水资源，而一些样品由于蒸发效应而偏离了季节性MWLs。