SIMULATION AND EVALUATION OF POLLUTANT TRANSPORT IN CAU RIVER IN 2015 AND 2016 (FROM BAC KAN TO PHA LAI)

Abstract

This paper presents results of the simulation and evaluation of pollutants transport in Cau river in 2015 and 2016 (from Bac Kan to Pha Lai). The propagation of BOD, NH⁴⁺, NO^3-, PO₄^3- , and TSS in the river was simulated based on the basis of measurement data and the use of MIKE 11 considering the sources of river discharge on both river banks. The results showed that the concentrations of BOD, NH⁴⁺, NO^3-, PO₄^3-, and TSS in the downstream area were higher than those in the upstream area. Additionally, downstream areas’ DO concentration was lower than that in the upper area. In the rainy season, most concentrations do not exceed the surface water standard (QCVN 08-MT: 2015 / BTNMT). In the dry season, the NH4+ concentration in Cau river is rather high, especially in the part crossing Thai Nguyen city, Thai Nguyen province and Hiep Hoa town, Bac Giang province, exceeding B2 collumn of the surface water standard (QCVN 08-MT: 2015 / BTNMT).