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Estimation of River Instream Flow Considering Fish Habitat Conditions

어류의 서식처 조건을 고려한 하천의 필요유량 산정에 관한 연구

  • Published : 2004.11.01

Abstract

The purpose of this paper is to estimate the instream flow of the South Han River Basin to ensure an adequate supply of suitable quality of water for preservation and enhancement of aquatic ecosystems. Proposed methods is Physical Habitant Simulation System of Instream Flow Incremental Methodology. Accurate estimation on a water depth and a velocity distribution was acquired by applying a two dimensional hydrodynamic model for a simulation of a hydraulic parameter necessary for the habitat evaluation to be used in a physical habitat simulation system. The Habitat Suitability Criteria with the application of univariate curve on zacco platypus as a representative fish was able to be established by conducting a field investigation. The establishment of a hydrological materialistic balance between upper and lower streams was confirmed by conducting a simulation simultaneously together with a mainstream section, which was excluded from the considered sections for the inhabitation evaluation of fish.

남한강 수계를 대상으로 대표 어종의 하천 어류 서식처 환경에 대한 서식처 적합도 기준을 작성하고, 어류 서식을 위한 최적유량의 산정방법을 확립하기 위하여, 생태학적 접근 방법 중 어류서식처 환경평가방법의 한가지인 점유량점증론적방법론(IFIM)의 물리적서식처모의시스템(PHABSIM)을 적용하여 어류서식처 보호 및 유지를 위한 최적유량을 산정하였다. 서식처 평가에 요구되는 수리인자의 모의를 위해 2차원 동수역학적 모델을 이용하였으며, 현장조사를 실시하여 대표어종으로 선정된 피라미의 단일변량곡선법을 적용한 서식처 적합도 기준을 작성하였다. 이러한 결과를 토대로 유황변화에 어류 서식환경이 가장 민감하게 반응하는 여울 구간과 여울이 형성되지 않음으로서 어류의 서식처 평가의 고려대상에서 제외되었던 본류 구간을 동시에 모의하여 상$\cdot$하류간의 수문학적 물질균형이 이루어짐을 확인할 수 있었다.

Keywords

References

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