期刊名称：Journal of Applied Research in Water and Wastewater
印刷版ISSN：2476-6283
电子版ISSN：2476-6283
出版年度：2021
卷号：8
期号：1
页码：21-27
DOI：10.22126/arww.2021.6175.1201
语种：English
出版社：Razi University
摘要：Rivers are one of the primary water resources for agricultural, drinking, industrialand environmental applications; thus, assessment of the river water quality has agreat significance. This study aims to evaluate the self-purification capacity of theHaraz river and identify critical areas with the lack of dissolved oxygen along theriver. Also, the QUAL2K model, IRWQI and NSFWQI indexes were applied for thedetermination of water quality. In this study, primary pollutant sources includingurban areas, industrial centers, farmlands and multiple cold-water fish farms thattheir water usage and discharge have severe consequences on the quality andquantity of the river's stream were identified and located. This model was builtand calibrated for four seasons with data from six sampling stations of Harazriver. Based on this study, upstream of Haraz river has adequate self-purificationcapacity in comparison to its midstream and downstream, especially in the Amolcity area, lack of dissolved oxygen was observed and self-purification capacityconsiderably reduced. The critical areas of Haraz river in spring and winterseasons are downstream and the estuary region, while in summer and autumn,critical areas are increased in Amol city. In general, as the elevation decreases,the water quality decreases. Only in upstream areas (near the Poloor village andbefore the Chelav station), water quality is in the average condition, but near theCaspian sea, the condition of Haraz river is worrying due to the existence ofcontamination sources.
