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http://dx.doi.org/10.5389/KSAE.2012.54.6.053

Simulation of 10-day Irrigation Water Quality Using SWAT-QUALKO2 Linkage Model  

Kim, Ji Hye (서울대학교 농업생명과학대학 지역시스템공학전공)
Jeong, Han Seok (서울대학교 농업생명과학대학 지역시스템공학전공)
Kang, Moon Seong (서울대학교 농업생명과학대학 조경.지역시스템공학부, 농업생명과학연구원)
Song, In Hong (서울대학교 농업생명과학대학 조경.지역시스템공학부, 농업생명과학연구원)
Park, Seung Woo (서울대학교 농업생명과학대학 조경.지역시스템공학부, 농업생명과학연구원)
Publication Information
Journal of The Korean Society of Agricultural Engineers / v.54, no.6, 2012 , pp. 53-63 More about this Journal
Abstract
The objectives of this study were to develop a linked watershed-waterbody modeling system and to assess the impacts of indirect wastewater reuse on irrigation water quality. The Osan stream watershed within Gyeonggi-do of South Korea was selected for this study. The linked modeling system was composed of the SWAT (Soil and water assessment tool) and QUALKO2 models. The SWAT model was calibrated and validated using the stream discharge and water quality data from 2010 to 2011. Runoff and non-point source pollutants from each subbasin and stream discharge from 1980 to 2009 were simulated by the SWAT model and applied to the QUALKO2 model. The QUALKO2 model was calibrated and validated under the conditions of low water and normal discharges, respectively. Finally, The 10-day irrigation water quality from April to September was simulated. The statistical measures of coefficient of determination ($R^2$), reliability index (RI), and efficiency index (EI) were used to evaluate the system performance. The $R^2$, RI and EI values ranged from 0.5 to 1.0, 1.03 to 1.92, and -35.03 to 0.95, respectively. The 10-day irrigation water quality showed the concentrations of BOD and coliform exceeded the water quality guidelines for wastewater reuse. The linked modeling system can be a useful tool to estimate non-point source pollutant loads in watershed and to control the water quality of effluent from a wastewater treatment plant and irrigation water in the downstream waterbody.
Keywords
Indirect wastewater reuse; irrigation water quality; SWAT; QUALKO2;
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Times Cited By KSCI : 5  (Citation Analysis)
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