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Estimation of CBOD Decay Rate for the Execution of Water Quality Model in the Nakdong-River Basin  

Yu, Jae-Jeong (Nakdong River Water Environment Research Laboratory, National Institute of Environmental Research)
Yoon, Young-Sam (Nakdong River Water Environment Research Laboratory, National Institute of Environmental Research)
Lee, Hae-Jin (Nakdong River Water Environment Research Laboratory, National Institute of Environmental Research)
Kim, Moon-Soo (Nakdong River Water Environment Research Laboratory, National Institute of Environmental Research)
Yang, Sang-yong (Nakdong River Water Environment Research Laboratory, National Institute of Environmental Research)
Lee, Young Joon (Yeongsan River Water Environment Research Laboratory, National Institute of Environmental Research)
Publication Information
Journal of Korean Society on Water Environment / v.21, no.5, 2005 , pp. 511-515 More about this Journal
Abstract
CBOD(carbonaceous BOD) decay rate was investigated for the execution of water quality model in Nakdong-Rive basin. Estimation of laboratory-derived CBOD decay rate, $k_l$ and CBOD decay rate in natural waters, $k_d$ were carried out. Hydraulic factors were applied for the calculation of $k_d$. Values of biochemical oxygen demand were investigated in Weagwan, Koreong, Jeokpo, Namgi and Mulgeom sites for the four times. The ranges of $k_l$ value were $0.04{\pm}0.01{\sim}0.14{\pm}0.03$. The values of $k_l$ in upstream sites were much larger than those in the downstream sites. The values of $k_d$ were 0.025, 0.036, 0.005 and 0.001 at Weagwan, Jeokpo, Namgi and Mulgeom, respectively, indicating that values of $k_d$ were generally larger than those of $k_l$.
Keywords
Deoxygenation coefficient; CBOD decay rate; Input parameter; Model parameter; Model input parameter;
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