Ecology and Resilient Infrastructure

Korean Society of Ecology and Infrastructure Engineering (응용생태공학회)
권호 표지
DOI QR코드

DOI QR Code

An Experiment on Flow Simulation Depending on Opening Configuration of Weir Using a Numerical Model

수치모형을 이용한 보의 개방구성에 따른 흐름모의 실험

  • Received : 2020.09.21
  • Accepted : 2020.09.28
  • Published : 2020.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

This study investigated that the numerical experiment for analysis on free overtopping flow by a weir of levee type, as the first stage of the development of a numerical technique for prediction methodology based on a numerical model. Using 2-dimensional flow models, Nays2DH, we conducted numerical simulations based on existing experimental data to compare and verify the models. We firstly discussed the numerical reproducibility for the discontinued flow by weir shape, and calibrated the computational flow through preprocessing of channel bed. Further, we carried out and compared the simulations for prediction on the overtopping flow by the number of weir gates. As a result of simulations, we found that the maximum flow velocity of downstream of weir increases when the number of weir gates increases under the same cross sectional area of flow. Through such results, this study could present basic data for hydraulic research to consider the water flow and sediment transport depending on weir operation in the future work.

본 연구는 수치모형을 기반으로 하는 예측방법론을 위한 수치기법개발의 첫 단계로서 제방형 보에 의한 자유형 월류흐름에 대한 수치해석실험을 수행하였다. 이를 위해 2차원 흐름모형인 Nays2DH를 이용하여 기존에 수행된 실험자료를 바탕으로 수치실험을 수행하여 모형을 비교검증하였다. 우선은 위어의 형태에 의한 불연속 흐름의 수치적 재현성에 대해서 고찰했으며 하도의 전처리를 통해 모의흐름을 보정하였다. 더 나아가, 수문갯수에 따른 월류흐름의 예측모의를 수행하여 결과를 비교하였다. 모의결과, 수문의 갯수가 증가할 경우 동일한 통수단면적에서 보 하류부의 최대유속이 증가할 수 있다는 것을 알 수 있었으며 이는 하상변동에도 영향을 줄 것으로 판단된다. 이러한 결과들을 통해, 본 연구는 추후의 보의 운영에 따른 흐름 및 유사이송 등을 고려하는 수리학적 연구의 기초자료를 제공할 수 있었다.

Keywords

References

  1. Choi, G., Kim, Y., Cho, S., and Kim, J. 2006. Variation of water elevation by setting angle of movable weir with bottom flow gate. In, Proceeding of KSCE Conference & Civil Expo 2006. pp. 2661-2664. (in Korean)
  2. Goutal, N. and Maurel, F. 1997. Proceedings of the 2nd workshop on dam-break wave simulation: Department Laboratoire National d'Hydraulic, Groupe Hydraulic Fluviale Electricite de Fracne, France.
  3. Han, H., Kim, Y., Choi, G., and Lee, S. 2013. An experimental study of flow characteristics at the downstream depending on gate operation of a sluice gate. Journal of Korea Society Hazard Mitigation 13(5): 317-324. (in Korean). https://doi.org/10.9798/KOSHAM.2013.13.5.317
  4. Hermann, M.F. and Willi, H.H. 1998. Hydraulics of embankment weirs. Journal of Hydraulic Engineering 124(9): 963-971. https://doi.org/10.1061/(ASCE)0733-9429(1998)124:9(963)
  5. International River Interface Cooperative (iRIC). 2020. Available online: http://i-ric.org/en (accessed in 2020).
  6. Jang, C. and Woo, H. 2009. Analysis of bed material changes by flushing flow from Daecheong dam. Journal of Korea Water Recourses Association 42(10): 845-855. (in Korean) https://doi.org/10.3741/JKWRA.2009.42.10.845
  7. Kang, T. and Jang, C. 2020. Study on numerical technique considering the river flow and the bed response by the dam operation. In, Proceeding of Ecology and Resilient Infrastructure Conference. pp. 47. (in Korean)
  8. Kim, H., Kim, J., and Cho, Y. 2009. Numerical analysis of dam-break flow in an experimental channel using cut-cell method. Journal of the Korean Society of Civil Engineers 29: 121-129. (in Korean)
  9. Kim, J. and Han, K. 2008. One-dimensional hydraulic modeling of open channel flow using the Riemann approximate solver I: model development. Journal of Korea Water Recourses Association 41(8): 761-772. (in Korean) https://doi.org/10.3741/JKWRA.2008.41.8.761
  10. Kim, K. 2005. An experimental study on the stream flow by submerged structures condition. Ph.D. dissertation, University of Incheon, Incheon, Republic of Korea. (in Korean)
  11. Korea Institute of Construction Technology (KICT). 2011. Development of design techniques and numerical models for river works. Research Report. (in Korean)
  12. Lee, J., Kim, K., and Shin, D. 2014. Development of hydraulic model to enable the simulation for operation rule of multi-function weir during the flood season. Journal of Korea Society Hazard Mitigation 14(3): 329-339. (in Korean) https://doi.org/10.9798/KOSHAM.2014.14.3.329
  13. Lee, J., Kim, K., Son, S., and Shin, D. 2015. Prediction of local scour development in downstream due to operation rule of movable weir gate. Journal of Korea Society Hazard Mitigation 15(4): 221-230. (in Korean) https://doi.org/10.9798/KOSHAM.2015.15.4.221
  14. Lee, K. and Jang, C. 2018. Experimental analysis of the sedimentation processes in the movable weir by changing the channel slope considering weir operation. Journal of Korea Water Recourses Association 51(8): 729-737. (in Korean)
  15. Mohd, Y.J. 1997. Combined immersed-boundary/B-spline methods for simulations of flow in complex geometries. Center for Turbulence Research: Annual Research Briefs. pp. 317-327.
  16. Murata, Y., Kimura, I., Shimizu, Y., and Yamaguchi, S. 2012. Numerical study on hydraulic characteristics and sedimentation around a dry dam. Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 68(4): I_877-I_882. https://doi.org/10.2208/jscejhe.68.I_877
  17. Shimizu, Y., Takebayashi, H., Inoue, T., Hamaki, M., Iwasaki, T., and Nabi, M. 2012. Nays2DH solver manual. Available online: http://i-ric.org/en (accessed in 2020).
  18. Watanabe, Y., Kimura, I., Yoshikawa, Y., and Hayakawa, H. 2013. Experimental study on sediment transport characteristics of dry dam. Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 69(4):I_1045-I_1050. https://doi.org/10.2208/jscejhe.69.I_1045
  19. Williams, G.P. and Wolman, M.G. 1984. Downstream effects of dams on alluvial rivers. United States Geological Survey Professional Paper, 1286.
  20. Yeo, H., Kang, J., Cheong, S., and Yoon, B. 2005. Experimental study on establishment of downstream critical depth in round-crested weir. In, Proceeding of the Korea Water Resources Association Conference. pp. 1113-1117. (in Korean)
  21. Yoon, J., Song, H., Jeong, S., and Jung, J. 2014. Numerical study on pier-scour of Mankyeong and Dongjin river according to Saemanguem master plan. In, Proceeding of the Korea Water Resources Association Conference. pp. 369-374. (in Korean)

Cited by

  1. 보 수문 운영에 따른 수생 서식처 변화 연구 vol.7, pp.4, 2020, https://doi.org/10.17820/eri.2020.7.4.300