Study on the Formation Mechanism of Chemical Constitution of Stream Water of the Molin River in the Ordos Basin
Study on the Formation Mechanism of Chemical Constitution of Stream Water of the Molin River in the Ordos Basin
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发表时间：
2007
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通讯作者：
Zhao Zhen-hong
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作者：
Zhao Zhen-hong
墨林河是我国内蒙古自治区杭锦县附近干旱区的一条内陆小河流，全长81 km，流域面积5220 km ~ 2，年径流量1.8×107 m3。在介绍墨林河水文地质条件的基础上，通过对墨林河19个河水和18个地下水样品的分析，对墨林河河水化学机制进行了深入研究对流域内采集的氢氧稳定同位素样品进行了分析，比较了流域内各水系水体的TDS、主要离子浓度、水化学性质、δ 18 O和δD等沿着径流的变化，用水溶组分平衡分布模型计算了方解石、白云石、石膏等的饱和指数，并利用质量平衡模型计算分析了沿着水流的水化学制度的变化机理，结果表明：石膏的溶解，方解石的沉淀和离子交换以及河水的混合和蒸发对河水化学结构的形成起着重要的作用，正离子中以Na+为主，负离子中以HCO-3为主，其次是Cl-和SO2- 4，墨林河上中游河水为HCO 3·Cl-Na型，下游河水为HCO 3·SO 4·Cl-Na型。
The Molin River is a small continental river in the arid region near Hangjin County of Inner Mongolia,China,it is 81 km in length,its drainage area is 5 220 km2,and its annual runoff volume is 1.8×107 m3.In this paper,the chemical institution of stream water of the Molin River is lucubrated based on introducing the hydrogeologic conditions and analyzing 19 stream water and groundwater samples 18 oxyhydrogen stable isotopic samples collected in the drainage basin.Moreover,the changes of TDS,concentration of the main ions,hydrochemical properties,δ18O and δD of stream water along stream flow are compared,the saturation indexes of calcite,dolomite,gypsum,etc.are calculated with hydrotropic component balance distribution model,and the change mechanism of chemical institution of stream water along stream flow is calculated and analyzed with the mass balance model.The results show that the dissolution of gypsum,precipitation and ion exchange of calcite and mixing and evaporation of stream water play an important role in the formation of chemical institution of stream water;in the positive ions,Na+ is dominant;in the negative ions,HCO-3 is dominant,and then Cl-and SO2-4.Stream water is in HCO3·Cl-Na type in the upper and middle reaches but in HCO3·SO4·Cl-Na in the lower reaches of the Molin River.