th < /一口>;L= 68 km, A=695 km²)，是特鲁凡南普兰市生活饮用水的主要水源。(n= 5^th;L= 24 km, A= 102 km²)是KR最大的支流，主要承载城市污染物，向下游汇入KR。选取2015年非季风(NON)和季风(MON)期间的12个水样(n=12x2= 24)，对关键水化学变量的变化和来源进行评估。应用Pearson相关和主成分分析(PCA)等环境方法对地表水质量有重要影响的污染源进行了分析。研究发现，污水排放和海水入侵是导致下游水质恶化的主要因素。 Further, the results of water quality analyses and Pollution Indices, viz., Organic Pollution Index (OPI), Eutrophication Index (EI) and Comprehensive Pollution Index (CPI) indicate that lower reaches (L= ~4 km) of KR is seriously polluted. A distinct Zone of Pollution Influence (ZPI) has been delineated based on the indices and this attempt is first of its kind in KR. The present study provides several noteworthy contributions to the existing knowledge on the factors influencing surface water quality and serves as a baseline data for watershed managers and administrators.