Groundwater quality assessment using entropy weighted water quality index (EWQI) in Lenjanat, Iran
Groundwater quality assessment using entropy weighted water quality index (EWQI) in Lenjanat, Iran
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DOI：
10.1007/s12665-014-3255-0
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发表时间：
2014-11-01
影响因子：
2.8
通讯作者：
Sohrabi, Nasim
中科院分区：
文献类型：
--
作者：
Amiri, Vahab;Rezaei, Mohsen;Sohrabi, Nasim
人类健康受到水质的严重影响，而受污染的地下水水质差又威胁着人类健康。在这项研究中，地下水水质和饮用水的适宜性进行了研究，在Lenjanat平原含水层，伊朗。根据世界卫生组织和伊朗的饮用水标准，对研究区的59个地下水样品进行了评价。2009-2010年期间，对选定监测源的地下水样本进行了季节性采样。测定了地下水的电导率、pH值、总溶解固体、Ca ~（2+）、Na ~+、K ~+、Mg ~（2+）、HCO ~（3-）、SO ~（4 2-）、Cl ~-、F ~-、NO ~（3-）等理化参数。在水质指标的计算过程中，各参数的权重通常由专家根据实际经验确定，主观性强，丢失了许多有用的、有价值的水质信息。为了避免对参数权重的个人判断，采用信息熵法对各参数进行权重分配。对地下水样本的熵权水质指数（EWQI）的计算表明，在雨季，超过57%和74%的样本分别处于基于世卫组织和伊朗标准的“优”至“中”质量范围内。由于旱季地下水质量下降，根据世卫组织和伊朗的标准，分别有42%和62%的样本处于“优”至“中等”质量范围。结果表明，EWQI的应用是非常有用的，以帮助公众和决策者将能够识别和评价在Lenjanat，伊朗的地下水质量。
Human health is strongly influenced by water quality which is threatened by the poor quality of polluted groundwater. In this study, the groundwater quality and its suitability for drinking have been studied in Lenjanat plain aquifer, Iran. Fifty-nine groundwater samples from study area were evaluated based on WHO and Iranian standards for drinking water. Groundwater samples from selected monitoring sources were sampled seasonally during 2009-2010. Physical and chemical parameters of groundwater such as electrical conductivity, pH, total dissolved solids, Ca2+, Na+, K+, Mg2+, HCO3-, SO42-, Cl-, F- and NO3- were determined. During the water quality index calculating process, the weight of each parameter is usually given by experts according to their practical experience, which is subjective, so much useful and valuable information about the water quality gets lost. In order to avoid personal judgments about the weight of parameters, an information entropy method was used to assign weight to each parameter. Calculation of entropy weighted water quality index(EWQI) for groundwater samples showed that in the wet season, over 57 and 74 % of samples were in the range of "excellent'' to "medium'' quality based on WHO and Iranian standards, respectively. Due to groundwater quality reduction during dry season, 42 and 62 % of samples were in the range of "excellent'' to "medium'' quality based on WHO and Iranian standards, respectively. The results indicate that application of the EWQI is very useful to help the public and decision-makers will be able to identify and to evaluate groundwater quality in Lenjanat, Iran.