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首页> 外文期刊>Journal of climate change >Application of Water Isotopes to Identify the Sources of Groundwater Recharge in a Karstified Landscape of Western Himalaya
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Application of Water Isotopes to Identify the Sources of Groundwater Recharge in a Karstified Landscape of Western Himalaya

机译：水同位素鉴别中的应用Karstified地下水补给来源喜马拉雅西部的风景

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摘要

The spatial and temporal distribution of δ~(18)O and δD measurements of precipitation and groundwater were used to identify the recharge areas of groundwater/springs in a mountainous catchment of the western Himalaya. The δ~(18)O and δD of precipitation showed marked spatial and seasonal variability with δ~(18)O and δD varied from 0.1‰ to –13.0‰ and 1‰ to –74‰ with an average of –6‰ and –38‰, respectively. δ~(18)O and δD of precipitation is strongly in?uenced by the basin relief and meteorology. The mean altitude gradient of –0.15‰ and –1.16‰ per 100 m change in elevation for δ~(18)O and δD, respectively, was observed based on amount weighted mean precipitation isotopic values. The δ~(18)O and δD in groundwater showed a narrow spatial and temporal variation in comparison to precipitation and varied from –6.8 ‰ to –10 ‰ and –58‰ to –38‰, with an average of –8‰ and –46‰, respectively. The most depleted (in heavier isotopes) isotopic values were observed in karst springs and most enriched (in heavier isotopes) isotopic values were observed in shallow groundwater samples. The results suggest that the groundwater with most depleted isotopic values have recharge areas at higher altitudes, whereas the groundwater with less depleted isotopic values have recharge areas at lower elevations. The climate change has shown the reduced snowfall and annual discharge in perennial karst springs i.e. 40-70%, besides seasonal springs dried up in recent years.
机译：的空间和时间分布δ~ (18)O和δD测量降水和地下水被用来识别充电在山地地区的地下水/弹簧流域西喜马拉雅山脉。降水和δD显示空间和标记季节性变化δ~ (18)O和δD多样从0.1‰- -13.0‰和1‰- -74‰分别平均为6‰,-38‰。和δD降水强烈吗?盆地救援和气象。altitude gradient of—0。15‰and‰,100米16—1。的高程变化δ~ (18)O和δD,分别是基于数量的观察加权平均降水同位素值。δ~ (18)O和δD地下水中显示一条狭窄空间和时间变化相比降水从-6.8‰- -10‰和多样-58‰到-38‰,平均8‰,-46‰,分别。在岩溶同位素)同位素值观察弹簧和最丰富(重同位素)同位素值观察在浅地下水样品。地下水与大多数耗尽同位素值在高海拔地区,充电而地下水枯竭的同位素较小值充电在较低海拔地区。气候变化表明降雪在多年生岩溶泉和年度放电即40 - 70%,除了季节性泉枯竭最近几年。

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