Investigating the maximum dischargeable pollution load in Mountain Rivers based on modeling

Articles in Press

Document Type : Original Article

Authors

1 Department of Water Engineering, Bu Ali Sina University in Hamedan

2 Associate Professor, Department of water Science and Engineering, Faculty of Agriculture, BASU, Iran

3 Dept of Water Eng. Hamedan Iran

10.22125/iwe.2024.436734.1784

Abstract

Today, one of the most effective ways to manage and protect surface water resources is to use the capacity of rivers to accept limits of pollution. In this study, the self-purification capacity of the Abbasabad river in Hamedan using the QUAL2KW model, based on the simulation of DO, BOD and COD parameters, taking into account the water quality standards in two areas for drinking (1.86 km) and agriculture (4.33 km) was evaluated. The accuracy of the simulated values was calculated through the calculation of statistical indices such as R2, SE, RMSE and NRMSE. The RMSE values in the validation stage for DO, BOD and COD values were calculated as 0.26, 1.82 and 2.62, respectively. The simulation results showed that the amount of dissolved oxygen decreased by -3.21% in the first period and by -1.66% in the second period. Also, the concentration of BOD and COD increased by 30.13 and 27.94% in the first period and by 70.84 and 60.81% respectively in the second period. Also, TMDL results showed that in the first period, the amount of input load should be reduced, but in the second period, it is possible to increase the input load. For BOD and COD parameters, the maximum load was calculated based on the agricultural standard at the two watersheds, as 49.80 mg/liter and 99.15 mg/liter.

Keywords

Main Subjects

Irrigation and Water Engineering

Articles in Press, Accepted Manuscript
Available Online from 18 February 2024

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