en عمومى General مقاله اصیل Original Article <div style="text-align: justify;">Background: Water pollution from nutrients is a major environmental challenge. This study investigated the relationship between physicochemical and hydrographic components with nitrates and phosphates in the Karun River, Ahvaz.<br> Methods: Forty samples were obtained from 10 different areas from the northern regions of the river to the south of Ahvaz city in all four seasons of 2023, using the Peterson grab for sediments and a 1-liter glass for water. The Hach Spectrophotometer (model DR2800, the United States) was used to measure nitrate and phosphate levels. River discharge was measured using the Guage method, evaporation rate was determined using the transpiration method, sedimentation rate was calculated using bathymetric maps, average friction was determined using the Ch&eacute;zy method, particle diffusion coefficient was calculated using the transverse method, and mass remaining rate was based on Yang&rsquo;s wave movement equations.<br> Results: The results showed that water quality characteristics such as biochemical oxygen demand (BOD), chemical oxygen demand (COD), dissolved oxygen (DO), turbidity, and total suspended solids (TSS) in the samples from the northern areas were significantly better than in samples from the lower areas. Nitrate levels ranged from 21.81 to 23.95 mg/L, and phosphate levels ranged from 3.37 to 6.76 mg/L. There was a significant correlation between river discharge, evaporation rate, sedimentation rate, mass remaining, particle diffusion coefficient, and phosphate levels (P < 0.05). However, no significant relationship was found between these parameters and nitrate levels.<br> Conclusion: The findings are essential for understanding the relationship between hydrographic parameters and nutrient levels in water sources, which can lead to more effective environmental management strategies.</div> Water quality, Rivers, Nitrate, Phosphates, Karun River 1 11 http://ehemj.com/browse.php?a_code=A-10-1-390&slc_lang=en&sid=1 Mohsen Davoudi universityahvaz76@gmail.com 100319475328460020695 0009-0000-1231-3491 No Department of Environment, Ahv.C., Islamic Azad University, Ahvaz, Iran Azita Koushafar az.koushafar@iau.ac.ir 100319475328460020696 100319475328460020696 Yes Corresponding author: Department of Environment, Ahv.C., Islamic Azad University, Ahvaz, Iran Fatemeh Karimi Organi Fatemeh_karimi88@yahoo.com 100319475328460020697 100319475328460020697 No Department of Environment, Ahv.C., Islamic Azad University, Ahvaz, Iran Hossein Fathian fathian.h58@gmail.com 100319475328460020698 100319475328460020698 No Department of Water Resources Engineering, Ahv.C., Islamic Azad University, Ahvaz, Iran Hadideh Maboudi mikhak1111@yahoo.com 100319475328460020699 100319475328460020699 No Department of Fisheries, Ahv. C., Islamic Azad University, Ahvaz, Iran