Spatial-temporal assessment of water quality and assimilative capacity of river Ramganga, a tributary of Ganga using multivariate analysis and QUEL2K
Spatial-temporal assessment of water quality and assimilative capacity of river Ramganga, a tributary of Ganga using multivariate analysis and QUEL2K
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DOI：
10.1016/j.jclepro.2019.03.064
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发表时间：
2019-06-10
影响因子：
11.1
通讯作者：
Tare, Vinod
中科院分区：
文献类型：
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作者：
Gurjar, Suresh Kr;Tare, Vinod
恒河主要支流拉姆甘加河的水质在 2014 年和 2015 年两个日历年期间，每月在选定的 23 个监测站（主干 17 个，支流 6 个）采样 24 个参数进行监测。聚类分析根据水质参数值的相似性或差异，将站点分为三个具有统计显着性的聚类：重度污染、中度污染和轻度污染。判别分析有助于识别整个数据集中最具代表性的判别参数，在时间和空间分析中的正确分配率超过 86%。尽管拉姆甘加中部的有机负荷很高，但主干上几乎所有采样站观测到的溶解氧值均高于 4 毫克/升，即使在一年的贫水期也是如此。据估计，各个点源的 BOD 负荷减少约 16-49%，以在 Ramganga 河贫水季节维持水生物种所需的溶解氧水平（5-6 毫克/升）。这意味着从本地水生动植物群生存的角度来看，仅对这些来源的排放物进行初级处理就足够了。贫水季节拉姆甘加和恒河（与恒河汇合前后）水质的比较表明，就溶解氧和重金属等参数而言，拉姆甘加对恒河水质的下降没有显着影响。 (C) 2019 Elsevier Ltd. 保留所有权利。
Water quality of river Ramganga, a major tributary of the Ganga, was monitored by monthly sampling at selected 23 stations (17 on the main stem and 6 on tributaries) during two calendar years 2014 and 2015 for 24 parameters. Cluster analysis grouped the sites in three statistically significant clusters, highly polluted, moderately polluted and less polluted, based on the similarities or differences in water quality parameter values. Discriminant Analysis helped in identifying the most representative discriminant parameters in entire dataset with more than 86% correct assignment in both temporal and spatial analysis. Despite high organic load in the middle stretch of Ramganga, the observed dissolved oxygen values were higher than 4 mg/l at almost all sampling stations on the main stem, even in lean flow period of a year. About 16-49% BOD load reduction from various point sources was estimated to maintain the desired dissolved oxygen levels (5-6 mg/l) for aquatic species during lean flow season in river Ramganga. This implies that primary treatment alone of discharge from these sources is sufficient from the point of view of sustenance of indigenous aquatic flora and fauna. Comparison of water quality of Ramganga and Ganga (before and after the confluence with Ganga) for lean flow season revealed that Ramganga does not significantly contribute to the decline in water quality of river Ganga in terms of parameters such as dissolved oxygen and heavy metals. (C) 2019 Elsevier Ltd. All rights reserved.