Preprints
https://doi.org/10.5194/nhess-2021-180
https://doi.org/10.5194/nhess-2021-180

  08 Jul 2021

08 Jul 2021

Review status: a revised version of this preprint is currently under review for the journal NHESS.

Quantitative interpretation of risk potential of beach erosion due to coastal zone development

Changbin Lim1, Taekon Kim1, Sahong Lee1, Yoon Jeong Yeon1, and Jung Lyul Lee1,2 Changbin Lim et al.
  • 1School of Civil, Architecture and Environmental System Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea
  • 2Graduate School of Water Resources, Sungkyunkwan University, Suwon, 16419, Republic of Korea

Abstract. Coastal erosion is more severe due to human-induced coastal zone development in addition to natural climate change. Anthropogenic development affecting coastal erosion is divided into three areas; watersheds, coastal waters, and coastal land areas. In this study, the ultimate effect of anthropogenic development on changes in the amount of sand, changes in the littoral drift, and changes in shoreline variability in these three planar areas is expressed as quantitative risk potential of beach erosion damage, defined as a change in the planar surface of the sand beach. The change in the amount of sand is due to the law of conservation of matter, and the littoral drift characteristic of sand is interpreted as a change in the main crest line at the breaking point, and the response characteristics of shoreline position is interpreted as change in the erodibility and recovery characteristics of beach sand. This quantitative method was applied to Bongpo-Cheonjin Beach of erosion grade D (frequency of erosion damage within 5 years) in Gangwon-do, Korea to identify the cause of erosion and evaluate the detailed applicability of this method. It was interpreted using a series of aerial photographs taken from 1972 to 2017 and survey data obtained from the erosion rating project started in 2010. In the erosion rating project, the GPS shoreline survey of 4 times per year and the sand sampling at the swash zones of base line at 150 m intervals are mainly carried out. We showed the feasibility of methodology evaluating the risk potential for beach erosion proposed in this study, and it can be expected that this method will be applicable to eroded beaches elsewhere.

Changbin Lim et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on nhess-2021-180', Anonymous Referee #1, 26 Jul 2021
    • AC1: 'Reply on RC1', Changbin Lim, 18 Aug 2021
      • RC2: 'Reply on AC1', Anonymous Referee #1, 20 Aug 2021
        • AC2: 'Reply on RC2', Changbin Lim, 16 Sep 2021
  • RC3: 'Comment on nhess-2021-180', Anonymous Referee #2, 23 Aug 2021
    • AC3: 'Reply on RC3', Changbin Lim, 16 Sep 2021
  • RC4: 'Comment on nhess-2021-180', Anonymous Referee #1, 26 Aug 2021
    • AC4: 'Reply on RC4', Changbin Lim, 16 Sep 2021

Changbin Lim et al.

Changbin Lim et al.

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Short summary
This study aimed to quantitatively identify the erosion risk. Methods for identifying potentials were proposed, and by introducing a encroachment accumulation curve presenting the erosion consequence, the corresponding erosion risk was calculated. The validity of the method for verifying the risk was examined to the eastern coast of South Korea. We believe that our study makes a significant contribution to the literature and plays a key role in identifying methods that prevent erosion.
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