DOI QR코드

DOI QR Code

Two - Dimensional analysis in Dam Downstream due Spill Condition

방류조건에 따른 댐 하류부의 2차원 수치해석

  • Lee, Jong-Hyeong (Division of Civil & Environmental Engineering, Kongju National University)
  • 이종형 (공주대학교 건설환경공학부)
  • Received : 2012.10.25
  • Accepted : 2013.02.06
  • Published : 2013.02.28

Abstract

Two - dimensional numerical analysis model(RMA2), is mainly applied to analyze the flood water levels, velocities and change of river bed at the downstream of Dam. The analysis result be able to influence to Gwangchon bridge from Juam dam, freeboard be insufficient 0.7m to left bank 300m section of dam downstream. Bank overflow is appear to all section of Bosung river to PMF spill condition. Inundated district is appear to river confluence to 200year frequency and is expand to bank overflow to PMF spill condition. Velocity in the channel was simulated high velocity to the bridge and narrow reach and appear to riverbed degradation.

2차원 RMA2 모형을 이용하여 방류조건에 따른 댐하류 하천의 홍수위, 유속분포 및 하상변동을 분석하였다. 수위분석결과 200년빈도에 의한 영향은 주암댐에서 광천교까지 구간(1.27km)에서 나타났고, 여유고는 댐 직하류 좌안제방 300m 구간에서 0.7m 부족하였다. PMF 방류시는 보성강 전구간에서 제방을 월류하는 것으로 분석되었다. 침수범람구역은 200년 빈도에서는 하천합류부의 일부지점에서 발생하였고, PMF 방류시에는 제방월류로 침수구역이 확대되었다. 하도내의 유속은 교량 및 하도의 폭이 좁은 구간에서 비교적 유속이 크게 나타나 하상저하가 발생하였다.

Keywords

References

  1. Gee, D.M., and MacArthur, R.C., Evaluation and Application of the Generalized Finite Element Hydrodynamics Model, RMA-2. Two-dimensional modeling, Hydrologic Engineering Center, pp. 97-113, 1981.
  2. Olsen, N. R. B. and Kjellesvig, H. M. Three-dimensional numerical flow modeling for estimation of maximum local scour depth. Journal of Hydraulic Research, Vol.36, No.4, pp.579-590, 1998. DOI: http://dx.doi.org/10.1080/00221689809498610
  3. Olsen, N. R. B. and Kjellesvig, H. M. Three-dimensional numerical modeling of bed changes in a Sand trap. Journal of Hydraulic Research, Vol.37, No.2, pp.189-198, 1998. DOI: http://dx.doi.org/10.1080/00221689909498305
  4. Yoon, Tae Hoon, Jung, Eui Teak, Park, Jong Suk, Junction flow analysis by two-dimensional numerical model, Journal of Korea Water Resources Association, Vol. 31, No. 5, pp.529-538, 1998.
  5. Han, Kun Yeun, Chung, Jae Hak, Lee, Eul Rae, Two dimensional analysis on inundated flow in floodplain, Journal of Korea Water Resources Association,Vol. 33, No. 4, pp.483-493, 2000.
  6. Hong, Sung Min, Jeong, in Geun, Lee, Joon Woo, Kim Sung Joon, Riverflow analysis of Gyeongan river doenstream reach use SMS, The Korean association of Geographic Information studies, Vol. 7, No. 1, 2004.
  7. Shin,Kwang Seob, Jeong, Sang Man, Lee, Joo Heon, Song Pum, Flow characteristics and riverbed changes simulation for the upstream and downstream section of Gongju bridge, Journal of the Korean society of hazard mitigation, Vol. 8, No. 2, pp.119-127, 2008.