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Characteristics of Probability Distribution of BOD Concentration in Anseong Stream Watershed  

Kim, Kyung Sub (Department of Environmental Engineering, Hankyong National University)
Ahn, Taejin (Department of Civil Engineering, Hankyong National University)
Publication Information
Journal of Korean Society on Water Environment / v.25, no.3, 2009 , pp. 425-431 More about this Journal
Abstract
It is very important to know the probability distribution of water-quality constituents for water-quality control and management of rivers and reservoirs effectively. The probability distribution of BOD in Anseong Stream was analyzed in this paper using Kolmogorov-Smirnov test which is widely used goodness-of-fit method. It was known that the distribution of BOD in Anseong Stream is closer to Log-normal, Gamma and Weibull distributions than Normal distribution. Normal distribution can be partially applied depending on significance level, but Log-normal, Gamma and Weibull distributions can be used in any significance level. Also the estimated Log-normal distribution of BOD at Jinwi3 station was to be compared with the measured in 2001, 2002 and 2003 years. It was revealed that the estimated probability distribution of BOD at Jinwi3 follows a theoretical distribution very well. The applicable probability distribution of BOD can be used to explain more rigorously and scientifically the achievement or violation of target concentration in TMDL(Total Maximum Daily Load).
Keywords
Anseong stream; BOD; Kolmogorov-smirnov; Log-normal distribution; Probability distribution;
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