Assessment of potential beach erosion risk and impact of coastal zone development: a case study on Bongpo–Cheonjin Beach

Lim, Changbin; Kim, Tae Kon; Lee, Sahong; Yeon, Yoon Jeong; Lee, Jung Lyul

doi:10.5194/nhess-21-3827-2021

Cited by 10 publications

(8 citation statements)

References 53 publications

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“…Recently, Kim et al (2021) expressed the peak erosion width due to storm waves as a function of beach response and recovery factors by applying shoreline survey data and ODE model results. In addition, Kim et al (2021) and Lim et al (2021) verified that the shoreline survey data collected for many years follows a Gaussian distribution. Moreover, a method for statistically estimating the peak erosion width due to storm waves is proposed.…”

Section: Introductionmentioning

confidence: 71%

A Study on the Influence of Sand Median Grain Size on the Short-Term Recovery Process of Shorelines

Lim

Kim

Kim³

et al. 2022

Front. Mar. Sci.

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Recently, the impacts of short-term erosion caused by storm waves on coastal damages are increasingly recognized as social issues, compared to those of long-term erosion from climate change or coastal development. The erosion caused by the storm wave has an episodic characteristic that the shoreline recovers gradually after retreating for a short-term. Furthermore, if shoreline changes caused by longshore sediment transport are not taken into consideration, the shoreline position is determined by following two physical parameters based on the bulk response model. The beach response factor determines converging ultimate erosion on the assumption that incident waves constantly affects a beach, which can be estimated according to the concept of Dean’s profile. On the contrary, the beach recovery factor affects the velocity of the shoreline retreat and recovery. Therefore, the parameter plays an important role to predict the peak erosion due to the storms. However, there are still insufficient researches to utilize it as an engineering design for erosion reduction. In this study, the two methodologies (i.e., approximation formula and statistical analysis) that estimates peak erosion width caused by the storms are compared to extract the beach recovery factor. During the process, it is confirmed that peak wave height has little impact on the beach recovery factor. Instead, it is mainly determined by the median grain size. Also, the beach recovery factor is estimated as a function of median grain size based on the shoreline and sand survey data conducted over ten years. Among the 41 surveyed sites along the east coast, 11 sites of straight-type shorelines that directly react to the incident waves were applied to consider only the short-term recovery process. To prove validity, the estimated applied into the real sea and then the results were compared to the shoreline data extracted from CCTV images. Using these results, the peak erosion width for a target wave event can be predicted with only median grain size. These study results are expected to be used as a concrete and practical means to manage the coast, in preparation for the current and future shoreline erosion threats.

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Section: Introductionmentioning

confidence: 71%

A Study on the Influence of Sand Median Grain Size on the Short-Term Recovery Process of Shorelines

Lim

Kim

Kim³

et al. 2022

Front. Mar. Sci.

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“…In addition, for the area from MSL to MSL (+) 5 m, including the coastline, data were acquired using real-time kinematic (RTK)-GNSS while moving along the coastline on foot with transportation equipment. In the case of Bongpo Beach, as almost no topographic change occurs outside MSL (-) 10 m, the depth of closure is judged to be approximately MSL (-) 10 m (Lim et al, 2021). Six observations were performed at 5 m or 10 m intervals to analyze the topographic changes caused by storm waves and high waves from July 2020 to March 2021.…”

Section: Water Depth Data Before and After Storm Wavesmentioning

confidence: 99%

Field Observation and Quasi-3D Numerical Modeling of Coastal Hydrodynamic Response to Submerged Structures

Hwang¹,

Do²,

Kim³

et al. 2023

J. Ocean Eng. Technol.

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Even though submerged breakwater reduces incident wave energy, it redistributes the coastal area's wave-induced current, sediment transport, and morphological change. This study examines the coastal hydrodynamics and the morphological response of a wave-dominated beach with submerged breakwaters installed through field observation and quasi-3D numerical modeling. The pre-and post-storm bathymetry, water level, and offshore wave under storm forcing were collected in Bongpo Beach on the East coast of Korea and used to analyze the coastal hydrodynamic response. Four vertically equidistant layers were used in the numerical simulation, and the wave-induced current was examined using quasi-3D numerical modeling. The shore normal incident wave (east-northeast) generated strong cross-shore and longshore currents toward the hinterland of the submerged breakwater. However, the oblique incident wave (east-southeast) induced the southeastward longshore current and the sedimentation in the northeast area of the beach. The results suggested that the incident wave direction is a significant factor in determining the current and sediment transport patterns in the presence of the submerged breakwaters. Moreover, the quasi-3D numerical modeling is more appropriate for estimating the wave transformation, current, and sediment transport pattern in the coastal area with the submerged breakwater.

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“…The shoreline is constantly changing depending on various external conditions (e.g., waves and sea level rise etc.). Recently, Lim et al (2021) classified the causes that affect shoreline change into three categories according to the spatiotemporal evolution characteristics (i.e., long-term background erosion, mid-term reshaping erosion and short-term episodic erosion). Among them, the wave environment is one of the main factors that immediately affect changes in the shoreline.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Equilibrium Shoreline by Wave Environmental Change Using MeePaSoL Software

Lim

2024

Journal of Coastal Research

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Assessment of potential beach erosion risk and impact of coastal zone development: a case study on Bongpo–Cheonjin Beach

Cited by 10 publications

References 53 publications

A Study on the Influence of Sand Median Grain Size on the Short-Term Recovery Process of Shorelines

A Study on the Influence of Sand Median Grain Size on the Short-Term Recovery Process of Shorelines

Field Observation and Quasi-3D Numerical Modeling of Coastal Hydrodynamic Response to Submerged Structures

Prediction of Equilibrium Shoreline by Wave Environmental Change Using MeePaSoL Software

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