马莲河下游河水与地下水转化的环境示踪
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摘要
为深入了解马莲河下游河水与地下水转化关系,沿河采集河水与地下水样品各15组,利用水化学分析、数值模拟等方法揭示了地下水与马莲河水的转化趋势及空间变化,并评价了转化强度。结果表明,河水Cl-质量浓度、总溶解固体(TDS)和电导率均高于地下水,沿流向呈降低趋势。地下水以补给河水为主,补给强度为0~4.66m2/d,累计补给量为1.65m3/s。补给强度受岩性分布影响存在空间变异,R12~R13、R14~R15段为地下水强补给段,R04~R09段补给较弱。地下水样品的代表性、水均衡要素的完整性和采样密度可能影响环境示踪方法的评价精度。应采用多方法示踪对比、加强支流的调查监测及增加采样密度等手段降低评价的不确定性。研究成果可为水资源统筹利用提供参考。
To better understand the interactions between river water and groundwater in the lower reaches of Malian River,a total amount of thirty samples were collected including river water and groundwater.Chemical analysis and numerical simulation were applied to understand the location and magnitude of river-groundwater interactions.The results show that Cl-concentration,TDS and EC in river water are higher than those in groundwater,and it descends along flow direction.Groundwater discharges to river mainly,the discharge rates and the total inflow are 0-4.66 m2/d and 1.65 m3/s,respectively.Affected by the lithology,the inflow varies spatially along river length with greater rates between R12 and R13 sample sites,as well as R14 and R15.While between R4 and R10,a weaker interaction is shown.The representation of the groundwater samples,the completeness of water balance items and sample resolution are shown to be of importance for evaluating groundwater inflows with environmental trace method.There will be a need for using multiply tracers approach,tributary investigation and monitoring and enhancing sample resolution to provide accurate estimation of groundwater inflows.The study can provide reference for the utilization of water resource.
To better understand the interactions between river water and groundwater in the lower reaches of Malian River,a total amount of thirty samples were collected including river water and groundwater.Chemical analysis and numerical simulation were applied to understand the location and magnitude of river-groundwater interactions.The results show that Cl-concentration,TDS and EC in river water are higher than those in groundwater,and it descends along flow direction.Groundwater discharges to river mainly,the discharge rates and the total inflow are 0-4.66 m2/d and 1.65 m3/s,respectively.Affected by the lithology,the inflow varies spatially along river length with greater rates between R12 and R13 sample sites,as well as R14 and R15.While between R4 and R10,a weaker interaction is shown.The representation of the groundwater samples,the completeness of water balance items and sample resolution are shown to be of importance for evaluating groundwater inflows with environmental trace method.There will be a need for using multiply tracers approach,tributary investigation and monitoring and enhancing sample resolution to provide accurate estimation of groundwater inflows.The study can provide reference for the utilization of water resource.
引文
[1]苏小四,万玉玉,董维红,等.马莲河河水与地下水的相互关系:水化学和同位素证据[J].吉林大学学报:地球科学版,2009,39(6):1 087-1 094.
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[3]解建仓,张建龙,朱记伟,等.马莲河苦咸水来源分析及治理方案[J].资源科学,2011,33(1):77-85.
[4]袁瑞强,龙西亭,王鹏,等.氯离子质量平衡法应用问题刍议[J].水文,2015,35(4):7-13.
[2]李云峰,李金荣,侯光才,等.从水文地球化学角度研究鄂尔多斯盆地南区白垩系地下水的排泄途径[J].西北地质,2004,37(3):91-95.
[3]解建仓,张建龙,朱记伟,等.马莲河苦咸水来源分析及治理方案[J].资源科学,2011,33(1):77-85.
[4]袁瑞强,龙西亭,王鹏,等.氯离子质量平衡法应用问题刍议[J].水文,2015,35(4):7-13.