Isotopic and hydrochemical composition of runoff in the Urumqi River, Tianshan Mountains, China
Isotopic and hydrochemical composition of runoff in the Urumqi River, Tianshan Mountains, China
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DOI：
10.1007/s12665-015-4144-x
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发表时间：
2015-02
影响因子：
2.8
通讯作者：
Cong-jian Sun;Weihong Li;Yaning Chen;Xingong Li;Yang Yuhui
中科院分区：
文献类型：
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作者：
Cong-jian Sun;Weihong Li;Yaning Chen;Xingong Li;Yang Yuhui
天然示踪剂可用于干旱地区，以了解径流产生和季节性径流来源；它们的应用可为水资源管理、水质研究和气候变化影响评估提供支持。在这项研究中，我们根据乌鲁木齐河的化学和同位素组成确定了不同季节的水文过程。从2011年12月至2012年10月，对乌鲁木齐河沿岸6个站位的稳定同位素(~(18)O和~(18)D)比值和主要离子浓度进行了逐月测量。乌鲁木齐河流域大部分水体(地下水、降水、冰川、融水、河水)为Ca-HCO3水型。在缓流期，河水的离子组成反映了白云石和石膏的风化和溶解。水-岩相互作用控制缓流期的水化学过程，而急流期河水的水化学特征受降水、冰川水和地下水的控制。不同地点河流δ18O和δD值的季节变化与进入乌鲁木齐河流域源头的水的季节变化相似。对降水的同位素组成进行了评估，以了解在干旱气候条件下云下蒸发和水分循环对降水的形成和同位素组成的影响。我们利用水化学和同位素组成确定了溪流中的五个不同时期。
Natural tracers can be used in arid regions to gain an understanding of streamflow generation and seasonal streamflow sources; their application can support water resources management, water quality studies, and assessments of the impacts of climate change. In this study, we identified hydrological processes in different seasons based on the chemical and isotopic compositions of the Urumqi River. Stable isotope (18O and D) ratios and major ion concentrations were measured on a monthly basis at six sites along the Urumqi River from December 2011 to October 2012. Most waters (groundwater, precipitation, glacier, meltwater, and river water) of the Urumqi River basin are the Ca–HCO3water type. In the slow flow period, the ionic composition of the river water reflects weathering and dissolution of dolomite and gypsum. Water–rock interactions control the hydrochemical processes during the slow flow period, while the hydrochemical characteristics of river water in the quick flow period are controlled by precipitation, glacier water, and groundwater. The seasonal variation in river δ18O and δD values at different sites was similar to that of water entering the headwaters of the Urumqi River basin. The isotopic composition of precipitation was evaluated to obtain information on the effects of subcloud evaporation and moisture recycling on the formation and isotopic composition of precipitation in arid climatic conditions. We identified five different periods in streamflow using water chemistry and isotopic composition.