Preprints
https://doi.org/10.5194/esurf-2021-71
https://doi.org/10.5194/esurf-2021-71

  13 Oct 2021

13 Oct 2021

Review status: this preprint is currently under review for the journal ESurf.

The sagging shape of shoreline formed on downdrift side of the structures due to seasonal oblique wave incidence

Changbin Lim1, Soonmi Hwang2, and Jung Lyul Lee3 Changbin Lim et al.
  • 1School of Civil, Architecture and Environmental System Engineering, Sungkyunkwan University, 2066, Seobu-ro, Suwon 16419, Korea
  • 2Department of Coastal Management, GeoSystem Research Corporation, 172 LS-ro, Gunpo 15807, Korea
  • 3Graduate School of Water Resources, Sungkyunkwan University, 2066, Seobu-ro, Suwon 16419, Korea

Abstract. Downdrift coastal erosion has occurred at natural or man-made groynes on Korea’s eastern coast, caused by oblique high waves in winter months. The resulting shoreline planform has a sagging shape with a maximum indentation point within the eroded shoreline. This study focused on solving the frequent and severe coastal erosion problem of this type at the Jeongdongjin review of wave data over 40 years from the National Oceanic and Atmospheric Administration (NOAA), as well as analyzing shoreline monitoring images for identifying the yielding line of maximum indentation points. An analytical method was developed to verify the eroding shoreline in a sagging shape and its maximum indentation by applying the conservation principle of sediment transport and the empirical model of equilibrium shoreline. To examine how well the empirical formula is suitable for the Jeongdongjin coast, the annual directional spectrum of the observed wave data was applied to the simple diffraction wave model for the gamma breakwater, and satisfactory agreement was obtained by comparing it with the shoreline results. Breaking wave height and angle, duration, longshore sediment transport coefficient, and protruding length of the groyne were the inputs. The theoretical results are in good agreement with those of the shoreline monitoring program. The factors mitigating downdrift coastal erosion of this type were identified by applying the obtained theoretical solution, and the engineering solutions were examined via factor analysis.

Changbin Lim et al.

Status: open (until 24 Nov 2021)

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Changbin Lim et al.

Changbin Lim et al.

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Short summary
Recently, along the eastern coast of South Korea, seasonal beach erosion induced by the structures which severely block the supply of sand from the upstream side. This study proposes a coastal solution that can predict the erosion of critical points in sag curves formed downstream of longshore sediment control facilities by applying a parabolic bay shape equation (PBSE).