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KMID : 1024520160250020217
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Journal of the Environmental Sciences
2016 Volume.25 No. 2 p.217 ~ p.229
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Long-Term Trend Analysis and Exploratory Data Analysis of Geumho River based on Seasonal Mann-Kendall Test
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Jung Kang-Young
Lee In-Jung
Lee Kyung-Lak
Cheon Se-Uk
Hong Jun-Young
Ahn Jung-Min
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Abstract
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The government has conducted a plan of total maximum daily loads(TMDL), which divides with unit watershed, for management of stable water quality target by setting the permitted total amount of the pollutant. In this study, BOD concentration trends over the last 10 years from 2005 to 2014 were analyzed in the Geumho river. Improvement effect of water quality throughout the implementation period of TMDL was evaluated using the seasonal Mann-Kendall test and a LOWESS(locally weighted scatter plot smoother) smooth. As a study result of the seasonal Mann-Kendall test and the LOWESS smooth, BOD concentration in the Geumho river appeared to have been reduced or held at a constant. As a result of quantitatively analysis for BOD concentration with exploratory data analysis(EDA), the mean and the median of BOD concentration appeared in the order of GH8 > GH7 > GH6 > GH5 > GH4 > GH3 > GH2 > GH1. The monthly average concentration of BOD appeared in the order of Apr > Mar > Feb >May > Jun > Jul > Jan > Aug > Sep > Dec > Nov > Oct. As a result of the outlier, its value was the most frequent in February, which is estimated 1.5 times more than July, and was smallest frequent in July. The outlier in terms of water quality management is necessary in order to establish a management plan for the contaminants in watershed.
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KEYWORD
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Seasonal Mann-Kendall test, Geumho river, Exploratory data analysis, LOWESS, TMDL
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