Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Application of Physical Habitat Simulation System (PHABSIM) in the Reach of Small Dam Removal for Zacco platypus

피라미에 대한 보 철거 구간에서의 물리서식처 모의(PHABSIM) 적용

  • Im, Dong-Kyun (River and Coast Research Division, Korea Institute of Construction Technology) ;
  • Jung, Sang-Hwa (River and Coast Research Division, Korea Institute of Construction Technology) ;
  • Ahn, Hong-Kyu (River and Coast Research Division, Korea Institute of Construction Technology) ;
  • Kim, Kyu-Ho (River and Coast Research Division, Korea Institute of Construction Technology)
  • Published : 2007.11.30
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Abstract

River restoration and environmental improvement projects have been peformed by social needs, therefore methodology for evaluating such projects must be provided. The PHysical HABitat SIMulation system (PHABSIM) is proposed as a tool for the assessment of hydraulic habitat suitability for aquatic species related to flow regime in river. This study evaluates the change of physical habitat for Zacco platypus according to small dam removal and the model suitability by applying PHABSIM to the reach where small dam was removed. It is shown that the physical habitat is generally increased and improved where the small dam was removed. However, physical habitat in the spawning stage that has a weak swimming speed is decreased by increased flow velocity in the upstream area of small dam, so proper countermeasure for that condition should be needed. Consequently, PHABSIM can be effectively used to provide methodology for assessment and necessity of various river projects including a removal of out-aged hydraulic structures.

하천환경에 대한 사회적 요구에 의해 다양한 하천 복원 및 환경개선사업이 진행되고 있으므로, 이와 같은 사업의 효과를 평가할 방법론이 제공되어야 한다. PHABSIM은 하천 흐름과 관련되어 있는 수생 생물의 수리적 서식처 적합도를 평가하기 위해 제안된 방법이다. 본 연구에서는 보 철거 구간에 PHABSIM을 적용하여, 보 철거에 따른 피라미의 물리서식처 변화와 모형의 적절성을 평가하였다. 그 결과 일반적으로 보를 철거할 경우가 존치할 때보다 물리서식처가 향상된 것으로 나타났다. 그러나 유영력이 약한 산란기의 물리서식처는 보 상류의 유속이 증가되어 감소하는 것으로 나타났으며, 이에 대한 적절한 대책이 필요하다. 본 연구에 적용한 PHABSIM은 보 철거 사업을 포한한 다양한 하천사업의 평가와 필요성을 제시하는 효과적인 방법으로 활용될 수 있을 것이다.

Keywords

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