Abstract
Kim, H.J.; Cho, S.M., and Cho, W.C., 2018. Numerical analysis of beach erosion at Jeongdongjin Beach in South Korea using field survey and measurement data. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 596–600. Coconut Creek (Florida), ISSN 0749-0208.Recently, Jeongdongjin Beach in Gangneung, Gangwon–do, in the eastern part of South Korea, has been seriously eroded, and several parts of the revetments along the coast were subsided due to frequent high wave attacks. Thus, several parts of the Jeongdongjin rail bike track and facility in the southern part of Jeongdongjin station were damaged and washed out. In this study, field surveys and measurements (including waves, current, water depth, seabed material, beach profile, and shoreline) at Jeongdongjin Beach 2014–2015 were conducted to analyze and determine the erosion process. From the surveys and measurements, it reveals that longshore currents moving to the south and north are generated in winter and summer season due to dominant NE and ENE wave directions, respectively. Rip currents are also generated in several points near the coast due to waves coming from various directions and morphological characteristics. Beach erosion at the front of Jeongdongjin station has repeatedly occurred due to high wave attacks. Numerical simulations on the generation of long-shore current, sediment transport, and shoreline change were conducted using field data, and the erosion process at Jeongdongjin Beach was analyzed to determine the characteristics of seasonal longshore sediment transport and the effect of the construction of revetments to beach erosion. From these monitoring data and numerical results, the process of Jeongdongjin Beach erosion was predicted and beach maintenance and protection plans at Jeongdongjin Beach are established.
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