Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Effect of Artificial Structures on the Long-Term Topographic Changes at Daehang-ri Intertidal Flat, the West Coast of Korea

인공구조물에 의한 대항리 갯벌의 장기 지형변화

  • Choi, Tae-Jin (Department of Oceanography, Kunsan National University) ;
  • Jeong, Eui-Young (Korea Institute of Ocean Science & Technology) ;
  • Yang, Young Jin (Korea Rural Community Corporation, Rural Research Institute) ;
  • Choi, Jin-Yong (Department of Ocean Science and Engineering, Kunsan National University)
  • Received : 2020.02.03
  • Accepted : 2020.03.18
  • Published : 2020.03.31
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Abstract

The Daehang-ri intertidal flat located the just outside of the Saemangeum dike has been reported to show new-developing flats. Based on the topographic surveys of 21 times from 2000 to 2016 by a leveling method every year, this site clearly shows variation of deposition/erosion in time and space. Deposition has consistently occurred at the rate of +3.75 cm per year at the area along the dike (Zone 1), and this tidal flat is expanding and prograding seaward. In the area of far from the dike (Zone 2), on the other hand, erosion prevails at the rate of -2.38 cm per year, and this zone tends to retreat landward. However, the erosional trend of Zone 2 has slightly slowed down since 2014. As a whole from 2000 to 2016, net deposition is recorded over 3.0 m at the upper beach and the area adjacent to the dike (Zone 1), while erosion up to 1.0 m in Zone 2. In conclusion, the results at the Daehang-ri intertidal flat clearly revealed that its topographic changes were induced by the artificial structures and water masses through its sluice gate. Counter-clockwise gyre newly created after the sea dikes construction probably results in relocating of sediment outside the dike 1 by transportation of materials eroded from the south to the north along the coast.

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References

  1. Choi, H., and M. B. Lee, 2012. The geomorphic changes of sand-beach coasts by human impact in Byeonsan peninsula, southwest Korea. Journal of The Korean Geomorphological Association 19(3): 83-96.
  2. Choi, J. H., and J. Y. Choi, 2015. Nourishment effect and morphological changes of byeonsan beach, west coast, south Korea (2011-2014). KCID Journal 22(1): 13-26.
  3. Choi, J. K., J. G. Son, J. G. Kim, and K. I. Song, 2002. Changes in sea bottom topology with Saemangeurn project. Journal of Korean Society of Rural Planning 8(2): 17-26.
  4. Choi, J. Y., and D. I. Lim, 2007. Morphological change at Byunsan beach, west coast of Korea; 14-years monitoring during the Saemangum reclamation project. Journal of Coastal Research 50(SI): 1112-1115.
  5. Choi, J. Y., J. Y. Park, J. H. Choi, and J. M. Lee, 2016. Effects of beach nourishment and the influence of irrigation water discharge on Byunsan beach, west coast, Korea. Irrigation and Drainage 65: 239-245. doi:10.1002/ird.2048.
  6. Choi, T. J., J. Y. Choi, J. Y. Park, H. Y. Um, and J. H. Choi, 2018. The effects of nourishments using the grain-size trend analysis on the intertidal zone at a sandy macrotidal beach. Journal of Coastal Research 85(SP1): 426-430. doi:10.2112/SI85-086.1.
  7. Eo, D. S., K. W. Choi, and S. K. Kang, 1999. Study on beach face variation based on long-term measurement data analysis in Byeonsan beach. KCID Journal 6(1): 39-47.
  8. HR Wallingford, 1997. Saemangum sea dikes: Wave climate and engineering review, EX 3668. Oxfordshire, United Kingdom.
  9. Kim, M. J., C. S. Kim, B. J. Choi, and S. H. Lee, 2018. Plume current change by seawall construction for a harbor development in south Korea. Journal of Coastal Research 85(SI): 126-130. doi:10.2112/SI85-026.1.
  10. Kim, T. R., and S. K. Park, 2009. Camera monitoring of topographical changes of Daehang-ri intertidal flat outside Semangeum sea dike No.1. Journal of Korean Society of Coastal and Ocean Engineers 21(6): 453-461.
  11. Koo, B. J., S. H. Shin, and S. Lee, 2008. Changes in benthic macrofauna of the Saemangeum tidal flat as result of a drastic tidal reduction. Ocean and Polar Research 30(8):485-495. https://doi.org/10.4217/OPR.2008.30.4.485
  12. Korea Ocean Research and Development Institute (KORDI), 2011. Saemangeum coastal system research for marine environmental conservation, BSPM55630-2269-2. Ansan, Korea.
  13. Korea Rural Community Corporation (KRC), 2003. Company newsletter 215, 12-13. Naju, Korea.
  14. Kwon, H. K., K. W. Choi, J. R. Jang, and J. Y. Jung, 2010. Morphological change of lower tidal flat in Byunsan.Gosapo beach. KCID Journal 17(2): 49-56.
  15. Lee, H. J., H. R. Jo, and M. J. Kim, 2006. Topographical changes and textural characteristics in the areas around the Saemangeum dyke. Ocean and Polar Research 28(3):293-303. https://doi.org/10.4217/OPR.2006.28.3.293
  16. Lee, H. J., M. J. Kim, and T. K. Kim, 2008. Modern sedimentary environments within the Gogunsan archipelago. Ocean and Polar Research 30(4): 519-536.
  17. Lee, H. J. and S. O. Ryu, 2008. Changes in topography and surface sediments by the Saemangeum dyke in an estuarine complex, west coast of Korea. Continental Shelf Research 28(9): 1177-1189. doi:10.1016/j.csr.2008.03.008.
  18. Lee, S., 2012. Prediction of changes in the Saemangeum marine environments, and its assesment. Environmental Law and Policy 9: 140-151.
  19. Rural Research Institute (RRI), 1999. Changes on sedimentary environment and coastal morphology due to sea dike construction, 99-05-18. Ansan, Korea.
  20. Rural Research Institute (RRI), 2002. Study on the topographic changes off sea dikes before and after construction of dikes and the investigation of reclamation projects at the southwest coast, Ansan, Korea.
  21. The Jeonbuk Domin Ilbo, 2005. Tidal flat at Saemangeum was formed about 134 ha, Jeonju.
  22. The Kyunghyan Shinmun, 2007. A year after closure of Saemangeum, Seoul.
  23. The Seoul Shinmun, 2010. Common orient clams off Saemangeum were gone, Seoul.