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Study on the Sediment and Velocity Characteristics around Bridge Based on Shape of the Piers

교각의 기하학적 형상에 따른 유사 및 유속의 변화 특성

  • 안승섭 (경일대학교 건설정보공학과) ;
  • 이효정 (한국건설기술연구원) ;
  • 서명준 (경일대학교 도시정보측지지적공학과 대학원) ;
  • 이증석 (경일대학교 토목공학과)
  • Published : 2009.02.28

Abstract

In this study, a river basin with a lot of measured data such as water level, flow rate, current speed, and sediment rate from the past to now was selected and geometrical shape of a pier was re-analyzed, in order to study the effects of the flow around the pier area as well as the riverbed alternation characteristics. A finite element mesh of the entire river was prepared, and via parameter revision, the section that the pier has influence on was decided, to analyze the shape of the pier using RMA-2 and SED2D-WES models. With regards to the section that the pier has influence on, analysis was done on the four pier shapes, namely circle, square, rectangle, and octagon. The results showed that the shape with the least influence around the pier around is the octagon, followed by circle, rectangle, and square, showing the different geometrical effects that the shapes have on the pier. Furthermore, it was shown that the distribution of sediment concentration had effect from about (+) 110 m of the upstream to about (-) 130 m of the downstream, from the pier installation point. Also, it was shown after analyzing drag forces for different sediment particle distributions that the shape with the greatest drag is the octagon, followed by circle, square, and rectangle.

Keywords

RMA-2;SED2D-WES;Parameter;Sediment concentration;Bed change

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