Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
권호 표지
DOI QR코드

DOI QR Code

Scour Characteristics of Artificial Reef through Experiment and Numerical Analysis

실내실험 및 수치해석을 이용한 인공어초 세굴 거동 특성 연구

  • Yun, Daeho (Department of Ocean engineering, Pukyong National University) ;
  • Kim, Yuntae (Department of Ocean Engineering, Pukyong National University)
  • Received : 2019.07.30
  • Accepted : 2019.09.16
  • Published : 2019.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

This study investigated the scour characteristics of artificial reef according to unreinforced and reinforced artificial reefs through laboratory test and numerical analysis. In this study, geogrid was used as a reinforcement of seabed. Three different reinforced areas were selected; one time, three times and five times bottom area of artificial reef. Two-dimensional water channel test was carried out to investigate scour patten of sand and silt grounds. Numerical analysis was also performed to see the velocity vector and scouring patten around artificial reef which was same condition with experiment. The numerical results were in good agreements with the experimental test results. It was found that the geogrid-installed soft ground under artificial reef tends to reduce scour, compared to unreinforced soft ground.

본 연구에서는 실내실험 및 수치해석을 통해 무보강 및 보강 조건에 따른 인공어초의 세굴 특성을 알아보았다. 해저 지반 보강재로는 지오그리드(geogrid)를 이용하였으며, 보강 면적은 인공어초 하부 면적 대비 1배, 3배 및 5배와 같이 다양한 배율로 적용하였다. 2차원 흐름 수조 실험을 통해 모래 및 실트 지반에서 인공어초의 세굴 패턴을 알아보았으며, 실내실험과 동일한 조건으로 수치해석을 수행하여 유속 벡터 분포 및 세굴 패턴을 알아보았다. 실내실험과 수치해석을 비교한 결과 세굴 패턴은 전반적으로 유사한 경향을 띄었으며, 무보강 지반보다 보강재를 설치한 인공어초 지반에서 세굴이 감소하는 것으로 나타났다.

Keywords

References

  1. Ahn, S. J., Kim, U. Y. and Lee, J. K. (1999), Experimental Study for scour Protection around Bridge Pier by Falling- Flow Interruption, Journal of Korean Society of Civil Engineering, Vol.19, No.1, pp.57-65.
  2. Briaud, J. L. (2008), Case Histories in Soil and Rock Erosion: Woodrow Wilson Bridge, Brazos River Meander, Normandy Cliffs, and New Orleans Levees, Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol.134, No.10, pp. 1425-1447. https://doi.org/10.1061/(ASCE)1090-0241(2008)134:10(1425)
  3. Briaud, J. L., Chen, H. C., Chang, K. A., Oh, S. J. and Chen, X. (2009), "Abutment Scour in Cohesive Materials." NCHRP Report 24-15(2), National Research Council: Transportation Research Board, Washington, DC, USA.
  4. Briaud, J. L., Ting, F., Chen, H. C., Cao, Y., Han, S. W. and Kwak, K. S. (2001), Erosion Function Apparatus for Scour Rate Predictions, Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol.127, No.2, pp.105-113. https://doi.org/10.1061/(ASCE)1090-0241(2001)127:2(105)
  5. Chen. X. (2008), Numerical Study of Abutment Scour in Cohesive Soils, Texas A&M University, Doctor of Philosophy, pp.1-191.
  6. Choi, K. B. and Kim, U. Y. (2000), Experimental Study on Local Scour around Bridge Piers by Scour Protection Devices, Journal of Korean Society of safety, Vol.15, No.1, pp.126-131.
  7. Duzbastilar, F. O., Lok, A., Uas, A., Metin, C. (2006), Recent developments on artificial reef applications in Turkey: hydraulic experiments. Bulletin of Marine Science, 78(1), 195-202.
  8. Kim, D. K., Suh, S. H., Cho, J. K., Kim, C. G., Choi, I. H. and Kim, B. S. (2010), Settlement Characteristics of Square Reefs installed on Soft Seafloor Ground, Journal of the Korean Society of Marine Engineering, Vol.34, No.1, pp. 163-167. https://doi.org/10.5916/jkosme.2010.34.1.163
  9. Kim, H. T. (2001), A Study of Artificial Reef Subsidence in Unsteady Flow Field, Journal of The Korean Society of Ocean Engineers, Vol.15, No.2, pp.33-38.
  10. Kim, J. Q., Mizutani, N. and Iwata, K. (1995), Experimental Study on the Local Scour and Embedment of Fish Reef by Wave Action in Shallow Water Depth, Proceeding of Civil Engineering in the Ocean12, pp.243-247.
  11. Kim, Y. S. and Gang, G. O. (2011), Experimental Study on Hydraulic Resistance of Sea Ground considering Tidal Current Flow, Journal of Korean Society of Coastal and Ocean Engineers, Vol.23, No.1, pp.118-125. https://doi.org/10.9765/KSCOE.2011.23.1.118
  12. Kimura, H., Ingsrisawang, V. and Ban, M. (1994), A study on the local scour of cylinder artificial fish reefs. Fisheries engineering, Vol.31, pp.33-40.
  13. Kwak, K. S., Chung, M. K., Chung, H. I., Woo, J. Y. and Cho, S. D. (2002), Measurements of Erosion Rate in Fine- Grained Soils., KGS spring conference, pp.337-342
  14. Lee, M. J., Choi, S. K., Choo, H. W., Cho, Y. S. and Lee, W. J. (2008). "Uniformity of Large Gypsum-cemented Specimens Fabricated by Air Pluviation Method", Journal of the Korean Geotechnical Society, Vol.24, No.1, pp.91-99.
  15. Oh, S. J. (2009), Experimental Study of bridge Scour in Cohesive Soil, Texas A&M University, Doctor of Philosophy, pp.1-238.
  16. Raineault, N. A., Trembanis, A. C., Miller, D. C. and Capone, V. (2013), Interannual changes in seafloor surficial geology at an artificial reef site on the inner continental shelf. Continental shelf research, Vol.58, pp.67-78. https://doi.org/10.1016/j.csr.2013.03.008
  17. Suh, S. H. and Kim, D. K. (2009), Settlement Prevention Method of Artificial Reefs using Suction Pile, Conference of the Korean Society of Marine Engineering, pp.321-322.
  18. Vaid, Y. P., Sivathayalan, D. S. and Stedman, D. (1999), "Influence of Specimen Reconstituting Method on the Undrained Response of Sand", Journal of Geotechnical Testing, Vol.22, No.3, pp.187-195. https://doi.org/10.1520/GTJ11110J
  19. Yeo, C. G., Lee, S. O., Yoon, S. E. and Song, J. W. (2011), Temporal Variation of Local Scour Depth in the Downstream of Weir with Shapes, Journal of Korean Society of Civil Engineering, Vol.31, No.4B, pp.353-360.
  20. Yun, D. H. and Kim, Y. T. (2019), Behavoirs of Artificial Reef Reinforced with Settlement Reduction Reinforcement, Journal of Korean Geosynthetics Society, Vol.18, No.1, pp. 1-9. https://doi.org/10.12814/JKGSS.2019.18.1.001
  21. Yun, S. J. and Kim, H. T. (2001), A Study of Artificial Reef Subsidence in Unsteady Flow-Wave Field, Journal of The Korean Society of Ocean Engineers, Vol.15, No.3, pp.28-34.