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도시, 농촌 및 임야유역으로부터 배출되는 비점원 오염부하의 특성비교
여중현 ( Joong Hyun Yur ),김건하 ( Geon Ha Kim ) 한국물환경학회 2005 한국물환경학회지 Vol.21 No.2
Impacts of non-point source pollution on water quality are well known. In this paper, effects of land use, precipitation characteristics, discharge characteristics on non-point source pollutant loadings at urban, agricultural and forestry watersheds were discussed. Rainfall runoffs from fifteen rainfall events were sampled and analysed at two urban watersheds, one rural watershed, and one forestry watershed. EMCs (Event Mean Concentration) were calculated based on monitored flow rates and concentrations. Statistical analysis carried out with runoff loadings and affecting variables indicated that runoff loadings are weakly correlated with the rainfall intensity and the dry days before rainfall events while showed no correlations with rainfall depth nor runoff quantity. By comparing EMCs between study watersheds on log-normal cumulative probability scale, EMCs ranking were in the descending order of urban watershed>agricultural watershed>forestry watershed for SS, TCOD, TN, and TP.
김건하,Joong Hyun Yur 대한토목학회 2004 KSCE JOURNAL OF CIVIL ENGINEERING Vol.8 No.2
The pathogen indicator organism means pathogen associated non-pathogenic microorganisms for easier identification of the contamination. The pathogen indicator organisms can be used for estimating the impacts of non-point source pollution as their concentration is flow rate dependent. This study aims to determine the concentration of the pathogen indicator organisms in the Geum River basin and to understand the impacts of the non point source pollution on the water quality. In this study, total coliform, fecal coliform, and Escherichia coli concentrations were monitored at eight sites in the Geum River Basin. Total coliform concentration showed a high correlation with the flow rate, and a tendency of higher concentration for more agricultural land use in a monitored area. From the analysis of the relationship between flow rates and contaminant loads or concentration, two curves explained the relationships for the low flow and high flow conditions, respectively. Load duration curves were developed to estimate the impact of non-point source pollution on the water quality. From the load duration curve analysis, it can be understood that the water qualities of the Geum River are affected by non-point pollution significantly compare to the magnitude of point source pollution.