Ecology and Resilient Infrastructure

Korean Society of Ecology and Infrastructure Engineering (응용생태공학회)
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Evaluation of Flow Resistance Coefficient based on Physical Properties of Vegetation in Floodplains and Numerical Simulation of the Changes in Flow Characteristics

홍수터 식생의 물리적 특성을 고려한 흐름저항계수 산정 및 흐름특성 변화 모의

  • Ji, Un (Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Jang, Eun-kyung (Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Ahn, Myeonghui (Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Bae, Inhyeok (Department of Civil and Environmental Engineering, University of Science and Technology)
  • 지운 (한국건설기술연구원 수자원하천연구본부) ;
  • 장은경 (한국건설기술연구원 수자원하천연구본부) ;
  • 안명희 (한국건설기술연구원 수자원하천연구본부) ;
  • 배인혁 (과학기술연합대학원대학교 건설환경공학)
  • Received : 2021.11.17
  • Accepted : 2021.12.01
  • Published : 2021.12.31
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Abstract

In this study, the flow resistance coefficient was calculated considering the physical properties and distribution characteristics of floodplain vegetation, and the effect of floodplain vegetation distribution on flow characteristics was analyzed by reflecting it in a two-dimensional numerical simulation. The three-dimensional point clouds of vegetation acquired using ground lidar were analyzed to apply floodplain vegetation's physical properties to the existing formula for vegetation flow resistance calculation. The floodplain vegetation distribution in the modeling was divided into locally distributed and fully distributed conditions in the floodplain. As a result of the simulation of the study site, the flow resistance coefficient of floodplain vegetation was found to have a value of about five times or more compared to the flow resistance coefficient of the main channel bed when the design flood occurs based on Manning's n coefficient. Also, it affected the hydraulic characteristics in the main channel and floodplain.

본 연구에서는 홍수터 식생의 물리적 특성과 분포 특성을 고려하여 흐름저항계수를 산정하고 이를 2차원 수치모의에 반영하여 홍수터 식생분포가 흐름특성에 미치는 영향을 분석하였다. 홍수터 식생의 물리적 특성을 기존의 식생 흐름저항산정 공식에 적용하기 위해 지상라이다를 이용한 식생의 3차원 포인트 클라우드 분석을 수행하였으며, 홍수터 식생분포는 국부적으로 식생이 존재하는 경우와 홍수터 전체에 식생이 분포하는 경우로 구분하여 모의를 수행하였다. 대상구간의 모의결과, 홍수터 식생의 흐름저항계수는 매닝의 조도계수를 기준으로 계획홍수량이 발생할 경우 주하도 하상 조도계수에 비해 약 5배 이상의 값을 갖는 것으로 나타났으며, 이는 주하도와 홍수터의 수리특성 변화에도 영향을 미치는 것으로 나타났다.

Keywords

Acknowledgement

본 연구는 금강수계관리위원회 환경기초조사사업의 지원을 받아 수행되었습니다.

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