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Numerical Analysis of the Behavior of Bars in a Compound Channel with a Drop Structure

낙차공이 있는 복단면 수로에서 사주거동의 수치분석

Gi-Jung Kim1
,
Chang-Lae Jang1
김 기정1
,
장 창래1
1Department of Civil Engineering, Korea National University of Transportation
1한국교통대학교 토목공학과
*교신저자. *Corresponding Author. 
31 March 2016. pp. 014-021
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Abstract

This study investigated the behavior of sediment bars in a compound channel with a drop structure. Flow was separated into side banks by alternate bars, and flow was concentrated into the downstream of bar fronts. The bed downstream of a drop structure degradated due to the concentrated flow from it. Bar shapes were kept by the influence of their shapes upstream. Alternate bars, central bars, and multiple bars were developed as the width to depth ratio increased, and the number of bars increased. The bar in the downstream of a drop structure decreased in length due to the concentration of flow and its disturbance.

Keywords
Bed change
Drop structure
Numerical model
Sediment bars

본 연구에서는 2차원 수치모형을 이용하여 복단면 하도에서 낙차공을 고려하여 하도 변화와 사주의 거동 특성을 분석하였다. 교호사주에 의하여 흐름이 분리되며, 사주의 선단부에서 흐름이 집중되고 수충부가 형성되었다. 낙차공에 의하여 흐름은 하도 전체에 균등하게 분산되었으며, 낙차공 하류에서는 흐름이 집중되고 하상고가 낮아졌다. 그러나 사주의 형상은 낙차공 상류의 영향을 받아 교호사주의 형상을 유지되었다. 하폭 대 수심이 증가하면서 교호사주, 중앙사주, 복렬사주가 형성되었으며, 사주의 수가 증가하였다. 낙차공에 의하여 흐름이 집중되어 낙차공 상류에서 사주길이보다 낙차공 하류에서 사주길이가 더 짧게 나타났다.

키워드
하상변동
낙차공
수치모형
사주
References
1
Ashida, K. and Michiue, M. 1972. Study on hydraulic resistance and bed-load transport rate in alluvial streams. Journal of Civil Engineering, Japan Society of Civil Engineers 206: 59-69. (in Japanese)
2
Blondeaux, P. and Seminara, G. 1985. A unified bar-bend theory of river meanders. Journal of Fluid Mechanics 157: 449-470.
3
Ikeda, S. and McEan, I.K. 2009. Flow and Sediment Transport in Compound Channels: The Experience of Japanese and UK Research. International Association of Hydraulic Engineering and Research, IAHR, CRC Press, New York, USA.
4
Ikeda, S., Parker, G. and Sawai, K. 1981. Bend theory of river meanders. Part 1. Linear development. Journal of Fluid Mechanics 112: 363-337.
5
Jang, C.-L. 2013. Dynamic characteristics of multiple bars in the channels with erodible banks. Journal of Korea Water Resources Research 46: 25-34. (in Korean)
6
Jang, C.-L. and Shimizu, Y. 2005. Numerical simula-tions of the behavior of alternate bars with different bank strength. Journal of Hydraulic Research 43: 596-612.
7
Kuroki, M. and Kishi, T. 1984. Regime criteria on bars and braides in alluvial straight channels. Proceedings of Japan Society of Civil Engineers 342: 87-96. (in Japanese)
8
Shimizu, Y., Fujita, M. and Hirano, M. 1999. Cal-culation of flow and bed deformation in compound channel with a series of vertical drop spillways. Annual Journal of Hydraulic Engineering, Japan Society of Civil Engineers 43: 683-688. (in Japanese).
9
Shimizu, Y. Takuyam, I. Michihiro and H. Toshiki, I. 2011. Nays2D Solver Manual of iRIC Software.
Information
  • Publisher :Korean Society of Ecology and Infrastructure Engineering
  • Publisher(Ko) :응용생태공학회
  • Journal Title :Ecology and Resilient Infrastructure
  • Journal Title(Ko) :응용생태공학회 논문집
  • Volume : 3
  • No :1
  • Pages :014-021
  • Received Date : 2016-02-05
  • Revised Date : 2016-03-09
  • Accepted Date : 2016-03-20
  • DOI :https://doi.org/10.17820/eri.2016.3.1.014
Journal Informaiton Ecology and Resilient Infrastructure Ecology and Resilient Infrastructure
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