Coastal basins are the world’s largest ultimate natural system for productivity and more than 40% of the world’s population prefers to live on the coastline. Thus, the coastal region is of great economic and nutritional importance. The current research study investigates the seasonal deviations in coastal water quality at four different locations along the Gulf of Khambhat, Gujarat, India, for three consecutive seasons (pre-monsoon, monsoon, and post-monsoon). The coastal water samples were collected and analyzed for the water quality in the prescribed study area. As a result, sea surface temperature, salinity, pH, EC, alkalinity, turbidity, salinity, total suspended particles, dissolved oxygen, biological oxygen demand, chemical oxygen demand, chloride, sulfate, and nutrients such as nitrate, nitrite, phosphate, and total organic carbon were investigated at Gulf of Khambhat Region. The samples were collected from four different locations (Ghogha, Dumas, Dahej, and Purna). The multivariate statistical analysis indicates that oxygen, dissolved solids, salinity, nutrients, the natural, and anthropogenic conditions are the major factor that affects water quality. The water quality index was calculated to evaluate the seasonal water quality of GoK. The results revealed that the quality of water was moderate in pre-monsoon, monsoon, and post-monsoon. The findings suggest that anthropogenic disturbances and the development of a variety of activities with increased point and non-point stormwater runoff are pumped directly into the coastal areas which damaged water quality. Therefore, the outcomes of physicochemical research of water quality indicators may be a useful tool for government leaders trying to ensure GoK’s long-term sustainability.

沿海盆地是世界上最大的生产力终极自然系统，世界上超过 40% 的人口更喜欢生活在海岸线上。因此，沿海地区具有重要的经济和营养价值。目前的研究调查了印度古吉拉特邦康巴特湾沿岸四个不同地点连续三个季节（季风前、季风和季风后）沿海水质的季节性偏差。采集沿海水样并分析规定研究区的水质。因此，海面温度、盐度、pH、EC、碱度、浊度、盐度、总悬浮颗粒、溶解氧、生物需氧量、化学需氧量、氯化物、硫酸盐以及硝酸盐、亚硝酸盐、磷酸盐等营养物质，在 Khambhat 地区的海湾调查了总有机碳和总有机碳。样本是从四个不同的地点（Ghogha、Dumas、Dahej 和 Purna）收集的。多元统计分析表明，氧气、溶解性固体、盐度、养分、自然和人为条件是影响水质的主要因素。计算水质指数以评估GoK的季节性水质。结果表明，季风前、季风和季风后的水质中等。研究结果表明，人为干扰和各种活动的发展以及点和非点雨水径流的增加被直接泵入沿海地区，从而损害了水质。所以，