Journal of the Korean Society of Hazard Mitigation (한국방재학회 논문집)

Korean Society of Hazard Mitigation (한국방재학회)
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Analysis of Curved-Channel Characteristics on Sloping Drop Structure Using Hydraulic Model Experiments

수리모형실험을 이용한 경사형 낙차공의 만곡부 흐름특성분석

  • Park, Moojong (Department of civil Engineering, Hanseo University) ;
  • Woo, Jaeyoung (Department of civil Engineering, Hanseo University) ;
  • Lee, Joungho (Department of civil & environmental Engineering, Hanbat University) ;
  • Song, Youngseok (Department of civil Engineering, Hanseo University)
  • Received : 2013.03.11
  • Accepted : 2013.05.22
  • Published : 2013.06.30
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Abstract

Hydraulic Structure are inevitably set up and operated in the river that flow characteristics are complex. When designing the water surface elevation and velocity by using 1-D Hydraulic Model, it will not be able to reflect the characteristics of Lateral Eddy and Superelevation due to centrifugal force. This study compared with result of 1-D Hydraulic Model and Hydraulic Model Experiments, Through the model experiment of Sloping Drop Structure installed on Curved-Channel. Hydraulic Model was constructed to baekseok bridge and Shinchun Bridge about 210 m interval located in Uijeongbu, Gyeonggi-do. Result of Hydraulic Modeling observed data and 1-D Hydraulic Modeling date are compared to design flood 100 year and 20 year. Result of experiments are depth ovserved data 35~48% low then 1-D Hydraulic Modeling date and velocity ovserved data 135~167% large then 1-D Hydraulic Modeling date. Research reaults expect to basic information for Curved-Channel Characteristics on Sloping Drop Structure.

하천 내에 불가피하게 설치 운영되는 수공구조물은 흐름특성이 복잡하여 단순히 1차원 수리모델에 의한 유속이나 수위를 이용하여 설계하는 경우에는 원심력에 의한 횡방향 특성이나 편수위를 반영할 수 없다. 본 연구에서는 만곡부에 설치된 경사형 낙차공에 대한 수리모형 실험을 통해서 낙차공의 수리특성을 파악하고 이를 수치모형과 1차원 설계에 의한 결과와 비교하였다. 경기도 의정부에 위치한 백석천의 신천교-백천교 210 m 구간에 대한 모형을 제작하고 100년 빈도와 20년 빈도 홍수량에 대하여 수리모형의 관측값과 1차원 모델인 HEC-RAS에 의한 계산값을 비교분석하였다. 실험결과 경사형 낙차공 구간에서 수심 관측 값은 계산 값보다 35~48% 작았으며, 유속 관측 값은 계산 값보다 135~167% 빠른 유속으로 원심력에 의해 좌안보다 우안이 수심이 높고, 유속은 크게 나타났다. 이러한 연구결과는 만곡부 하천에 수공구조물을 설치하는 경우 수리특성을 파악할 수 있는 기초정보로 유용하게 활용될 것이며 좌우안의 편수위 및 유속의 분석을 2차원이나 3차원 모형과 추가적으로 비교한다면 보다 유효한 결과가 도출될 것으로 기대된다.

Keywords

Acknowledgement

Supported by : 한서대학교

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