농업소유역에서 직접유출과 기저유출에 의한 오염부하특성

Pollutant Load Characteristics by Direct Runoff and Baseflow from Small Scale Agricultural Watershed

  • 신용철 (강원대학교 지역기반공학과) ;
  • 류창원 (강원대학교 지역기반공학과) ;
  • 최예환 (강원대학교 지역기반공학과) ;
  • 임경재 (강원대학교 지역기반공학과) ;
  • 최중대 (강원대학교 지역기반공학과)
  • 발행 : 2005.10.28

초록

Natural environment of Weolgok-ri watershed has been well preserved as a traditional agricultural watershed. A year record of streamflow, $NO_3-N$, T-N and T-P concentrations data(Apr, 2004-Mar. 2005) was examined to estimate annual and seasonal patterns of pollutnat loads in streamflow and baseflow from the agriculture watershed. To estimate pollutant loads from baseflow, baseflow component from total stream flow was seperated using digital filter method in the Web-based Hydrograph Analysis Tool system. Loads of $NO_3-N$, T-N and T-P from streamflow and baseflow were evaluated to investigate pollutant loads contribution by baseflow. The $NO_3-N$, T-N, and T-P loads from streamflow were 13.85 kg/ha, 45.92 kg/ha and 1.887 kg/ha, respectively. $NO_3-N$, T-N and T-P loads from baseflow were 7.43 kg/ha, 24.70 kg/ha, 0.582 kg/ha, respectively. It was found that $NO_3-N$ and T-N loads were contributed by the baseflow(53% and 53% of Total-loads) than the direct runoff(47% and 47% of Total loads). However, only 30% of total T-P was contributed by the baseflow. It is recommended that one needs to assess pollutant load contribution by the baseflow to identify appropriate control strategies for effective watershed management.

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