Modeling DO and BOD5 Changes in the Dez River by Using QUAL2Kw

Document Type : Original Research Paper

Authors

1 Department of Civil Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran

2 Department of Water Engineering, Dezful Branch, Islamic Azad University, Dezful, Iran

3 Department of Civil Engineering, Shahr-e-Gods Branch, Islamic Azad University, Tehran, Iran

Abstract

The present study evaluates the water quality of Dez River, a river 23 km long, via QUAL2Kw model, based on simulation of DO and BOD5 p98arameters, through considering water quality standards during six months in three stations of Kashefieh, Pole-Panjom, and Hamidabad. To determine the model’s validity and compare the observational data, the paper uses the square mean square error (RMES) and the squared mean square error coefficient (CV). The achieved results of the model largely indicate the actual conditions of the river, which represent the ability of QUAL2Kw model to simulate qualitative parameters. The main contamination of Dez River comes from municipal wastewater, either directly imported by river residents or collected by urban canals. It, then, enters the river at a certain point. Based on the simulation and observational results of DO at two stations of 5th and Hamidabad Bridge in all months of sampling, it is below 5 mg/L, regarded a threat to aquatic life. In addition, BOD5 parameter goes beyond 6 mg/L in Hamidabad station, being a threatening factor for aquatic life in this station. Critical conditions of Dez River, low discharge, and high loading of pollutants have increased the concentration of water quality parameters. Given the results of RMSE and CV parameters, the model has had the best conformity for DO parameter, followed by BOD5.

Keywords

References

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Pollution
Volume 8, Issue 1
January 2022
Pages 15-35

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