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Development of a Vegetation Buffer Strip Module for a Distributed Watershed Model CAMEL

유역모델 CAMEL 기반 식생여과대 모듈의 개발

  • Received : 2015.09.02
  • Accepted : 2015.10.05
  • Published : 2015.10.31

Abstract

In this study, a software module to predict the effectiveness of vegetation buffer strip (VBS) has been developed for using with Chemicals, Agricultural Management and Erosion Losses (CAMEL), a distributed watershed model. Most basic functions for the VBS module are same as CAMEL except functions newly developed to implement sedimentation enhancement by vegetation and level spreaders. For verification of the VBS module, sensitivity analyses for length, roughness, soil and vegetation type of VBS were carried out using a test grid cell. The surface discharge of sediment are highly sensitive to the roughness coefficient of VBS. The removal efficiencies of VBS for the surface discharges of sediment and TP are generally high regardless of environment changes. The surface discharges of TOC and TN are highly sensitive to the length and soil of VBS. The removal efficiencies of VBS for the surface discharges of TOC and TN are generally lower than those of sediment and TP. The newly developed VBS module reasonably simulates the removal efficiencies of surface discharges that vary according to the environment changes. It is expected that this VBS module can be used for evaluating the effectiveness of VBS-based best management practices to be applied to reduce pollution discharges from various non-point sources.

본 연구에서는 분포형 유역모델이면서, 국내 환경에 적합하도록 개발된 CAMEL에 기반하여 식생여과대 효과분석을 위한 모듈을 개발하였다. 식생여과대의 주요 모의기능은 기존의 CAMEL과 동의하나 릴에서의 유사포착 현상과 수평둔덕을 추가로 설계하여 모듈에 반영하였다. 식생여과대 모듈을 검증하기 위하여 시험 격자를 이용하여 식생여과대의 길이, 조도계수, 토성, 식생의 높이 및 뿌리 깊이 등 다양한 매개변수에 대한 민감도 분석을 실시하였다. 식생여과대 모듈의 민감도 분석결과를 종합해 보면, 유사 지표유출량은 조도계수 변화에 따라 민감하게 반응하였으며, 전반적으로는 유사와 TP의 지표유출량 저감률이 시나리오 변화에 상관없이 전반적으로 높은 것으로 분석되었다. TOC, TN의 저감률은 식생여과대의 길이, 토성변화에 따라 민감하게 반응하는 것으로 나타났으며, 유사와 TP의 지표유출량 저감률에 비해 상대적으로 저감률이 낮은 것으로 분석되었다. 본 연구에서 개발된 식생여과대 모듈은 환경변화에 따른 오염물질 저감효과를 합리적으로 재현하는 것으로 나타났으며, 향후 식생여과대 조성 지역에 적용되어 비점오염 물질 제거 효과를 정량적으로 산정하고 효율적인 관리방안을 평가하는데 기여할 것으로 기대된다.

Keywords

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