Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Characteristics and EMCs of NPS Pollutants Runoff from a Forest-Paddy Composite Watershed

산림논복합 소유역에서의 비점부하 강우유출 특성 및 EMC 산정

  • 송인홍 (서울대학교 농업생명과학대학 농업생명과학연구원) ;
  • 강문성 (서울대학교 조경.지역시스템공학부.농업생명과학연구원) ;
  • 황순호 (서울대학교 조경.지역시스템공학부.농업생명과학연구원) ;
  • 송정헌 (서울대학교 조경.지역시스템공학부.농업생명과학연구원)
  • Received : 2012.02.01
  • Accepted : 2012.03.20
  • Published : 2012.07.31
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Abstract

This study was aimed to characterize non-point source (NPS) pollutant runoff and estimate event mean concentrations (EMCs) from a small rural watershed located at the headwater area of the Gyeongan stream. The study watershed consists of the two major landuse, forest (72 %) and paddy field (28 %). The nine rainfall events ranging from 18.5 to 192.6 mm in amount were monitored in this study. Stream flow was measured at the watershed outlet using a water level gauge, while a number of water samples for each event were collected and analysed for water quality. Event pollutant loads varied greatly depending on rainfall events varying from 22.6 to 3,134.2 mg/L, 0.32 to 24.56 mg/L, 0.090 to 1.320 mg/L, and 2.3 to 149.8 mg/L for SS, TN, TP, and COD, correspondently. The respective mean EMCs were estimated by 104.2, 1.00, 0.168, and 7.9 mg/L. The Pearson correlation analysis showed that COD EMC was significantly correlated with those of SS, TN, and TP. Rainfall runoff ratio appeared to be negatively correlated with EMCs of SS, TP, and COD, although not statistically significant. The event loads from the largest rainfall was greater than the sum of those from the remaining eight events. The study results suggest that the appropriate management of intensified storm events are of greater importance in curbing NPS loads, while the estimated EMCs provide base data for the unit pollutant loads determination for the forest-paddy composite upstream watershed.

Keywords

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