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http://dx.doi.org/10.11614/KSL.2018.51.1.135

Characteristics of Runoff Load from Nonpoint Source Pollutants in the Lake Doam Watershed  

Kwak, Sungjin (Department of Environmental Engineering, Kangwon National University)
Bhattrai, Bal Dev (Department of Environmental Engineering, Kangwon National University)
Gim, Giyoung (Department of Environmental Engineering, Kangwon National University)
Kang, Phil-Goo (National Institute of Environmental Research)
Heo, Woomyung (Department of Environmental Engineering, Kangwon National University)
Publication Information
Abstract
In order to investigate the runoff characteristics of nonpoint source pollutants in the Lake Doam watershed, water quality and flow rate were monitored for 38-rainfall events from 2009 to 2016. The EMC values of SS, COD, TN and TP were in the range of 33~2,169, 3.5~56.9, 0.09~7.65 and $0.06{\sim}2.21mg\;L^{-1}$, respectively. As a result of analyzing the effect of rainfall factor on the nonpoint source pollutant load, EMCs of SS, COD and TP showed a statistically significant correlation with rainfall (RA) (p<0.01) and SS showed highly significant correlation with maximum rainfall intensity (MRI, R=0.48). The load ranges of SS, COD, TN and TP were 10.4~11,984.6, 1.1~724.4, 0.6~51.6 and $0.03{\sim}22.85ton\;event^{-1}$, respectively, showing large variation depending on the characteristics of rainfall events. The effect of rainfall on the load was analyzed. SS, COD and TP showed a positive correlation, but TN did not show any significant correlation. The annual load of SS was the highest with $88,645tons\;year^{-1}$ in 2011 when rainfall was the highest with 1,669 mm. The result of impact analysis of nonpoint source pollution reduction project and land-use change on runoff load showed that pollutant load significantly reduced from 2009 to 2014 but SS and TP loads were increased from 2014 to 2016 due to increase in construction area. Therefore, we suggested that nonpoint source pollution abatement plan should be continued to reduce the soil loss and pollutants during rainfall, and countermeasures to reduce nonpoint source pollution due to construction need to be established.
Keywords
Lake Doam; non-point source; pollutant load; runoff; precipitation;
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