Evaluation and Simulation of Talar River Quality by using QUAL2KW Model

Increasing of water demand, drought and climate changes, the development of contaminated resources, in addition to the threat of the ecosystem, affects the supply of drinking water and agriculture. The use of QUAL2KW as a qualitative numerical simulations model, water quality parameters changing such as dissolved oxygen (DO), biological oxygen (CBODu), acidity (pH), electrical conductivity (EC), nitrate (NO3-) and phosphate (PO43-) had studied in Talar River. The accuracy of predicted DO and pH parameters is better than the others. The most accurate simulation was occurred with the lowest coefficient of variation mean square error (0.017) and mean square error (0.139 mg/l) of pH parameter in February and also lowest accuracy in the simulation with maximum coefficient of variation mean square error (0.45) and mean square error (4.5 mg/l) of BODu parameter in November and most changes in the trend chart occurred in Ghaemshahr and Kiakola output Which could be due to the impact of the waste water coming from the two cities into the river. In general, the results of the river's simulation showed that the qualitative model QUAL2KW gives proper estimation of the river's quality conditions