A Study of Hydraulic Characteristics in Front of the Seawall under the Coexistence of Wave and Wind

Shim, Kyu-Tae; Kim, Kyu-Han

doi:10.9765/kscoe.2020.32.6.575

Cited by 3 publications

(4 citation statements)

References 16 publications

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“…The increase in the rundown is particularly noteworthy. Existing experiments on wind-induced hydrodynamic changes have primarily focused on the runup and overtopping [11,12,22,39]. However, it is important to analyze both the runup and rundown to assess the stability of breakwater armor stones.…”

Section: Runup Heightmentioning

confidence: 99%

“…The experimental results showed that a parapet of approximately 1 m could reduce wave overtopping by up to 30-40% under strong wind conditions. Shim and Kim [12] analyzed revetment overtopping under the condition of wind-wave coexistence. It was suggested that as the wind velocity increased, the maximum overtopping could increase by approximately 5-12%.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Effect of Wind on Armor Stone Stability

Kim,

Lim,

Yoon

2024

JMSE

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Wind is a significant factor influencing the stability of breakwater armor stones. However, few existing studies have considered the effects of wind on these structures. In this study, two-dimensional laboratory experiments were conducted to examine the effect of wind on the stability of breakwater armor stones. The stability factor (KD) of the armor stone, fluid velocity, runup, and rundown were observed under the action of waves and winds. A wind turbine was installed in front of the physical model of the breakwater to generate extreme wind conditions of 5.5 and 12 m/s. The results showed that KD decreased by 42.18% at 5.5 m/s and 57.82% at 12 m/s compared with that without wind. The maximum runup and rundown heights increased with wind velocity, following a Rayleigh distribution. The fluid velocity distribution conformed to a normal distribution, with the mean velocity directed offshore. Many studies have suggested that runup, rundown, and fluid velocity are the main factors affecting the stability of breakwater armor stones. The analysis revealed that wind affects these factors and lowers the stability coefficient. These wind-induced hydrodynamic changes suggest the need for a detailed hydrodynamic review of wind-wave conditions.

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Section: Runup Heightmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effect of Wind on Armor Stone Stability

Kim,

Lim,

Yoon

2024

JMSE

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“…However, a physical model test is easier to interpret and derive results from compared to field monitoring or numerical simulation. When a physical model test is applied, it is possible to simultaneously apply various parameters, such as grain size of sand and wave deformation due to wind speed, which allows interpretation with a higher degree of accuracy [24,25]. Thus, this study examines the suitability of beach nourishment as a method for maintaining a stable beach profile using hydraulic model experiments, among various interpretation techniques.…”

Section: Setup For Test Profilementioning

confidence: 99%

A Study on the Characteristics of Beach Profile Evolution According to the Particle Size Variation of Beach Nourishment

Shim

Kim

2023

Water

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This study investigated the beach nourishment effect and topographical changes when using nourishment sand with relatively large particle diameters to perform beach nourishment on a beach subject to erosion. A physical model test was conducted in a 2D wave flume with an installed wind tunnel. The experiment examined the sediment transport mechanism under conditions with wind and waves. Although applying nourishment sand with large particle diameters attenuated sediment transport, the increase in particle diameter was not always proportional to the reduction in topographical changes. Increasing the particle diameter of the nourishment sand increased the friction force between particles, resulting in large-scale erosion and accretion around the coastline, and this trend increased with winds. Also, with wind, the wave run-up height increased, the undertow became stronger, and large-scale scouring occurred at the boundary between the nourishment sand and the existing beach. Increasing the particle diameter of the nourishment sand played a role in reducing the run-up phenomenon (d50: 1.0 mm with 24–50%, d50: 5.0 mm with 59–83%), and the range of particles moved by winds also decreased (d50: 1.0 mm with 10–38%, d50: 5.0 mm with 5–37%).

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“…최근 기상이변 등 다양한 원인에 기인되어 고파랑의 내습 빈도와 규모가 증가되고 있다. 이러한 파랑이 해안에 도달할 경우 대규모 표사이동의 발생과 모래유실에 의한 해빈폭의 감 소는 당초의 해안선을 육지방향으로 이동시키기 때문에 짧아 진 해빈폭은 고파랑에 대한 충분한 완충지역으로의 역할을 수 행하지 못하게 된다 (Shim et al, 2019;Shim and Kim, 2020). 뿐만 아니라 해역의 활용도를 높이기 위해 친수성 호 안을 설치하는 사례가 증가하고 있으며, 호안의 경우 해안을 매립하는 경우도 있기 때문에 해빈폭의 감소와 함께 파랑의 불충분한 감쇄현상 (Kreyenschulte et al, 2020)은 호안 시설 물에 직접적으로 영향을 주어 제체 등의 안정성을 저하시킬 뿐만 아니라 호안 배후로의 월파량을 증가시킨다 (Baldock et al, 2011).…”

Section: 서 론unclassified

A Study on the Application of Low Crest Structures to Reduce Wave Overtopping

Shim¹,

Kim²,

Cha³

2022

J Korean Soc Coast Ocean Eng

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In this study, it was examined for the reduction of wave overtopping and water level fluctuation in front of the revetment when applying a reinforcement method to revetment where wave overtopping occurs. As a result of the study, in the case of the cross-sectional experiment. more than 70% of the wave overtopping reduction effect depending on the reinforcement conditions was occurred, and it was analyzed that the result increases by about four times or more in the comparison with the 3d test. The average water level in front of the revetment was lowered when a low crest structure was not installed. and there was a tendency to rise under the condition of low crest structures installed. In the comparison with the wave basin test, there was a difference of about 0.5 to 0.6 times when a low crest structure was not installed, and it was increased by 5.5 times after low crest structures were installed.

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A Study of Hydraulic Characteristics in Front of the Seawall under the Coexistence of Wave and Wind

Cited by 3 publications

References 16 publications

Experimental Study on the Effect of Wind on Armor Stone Stability

Experimental Study on the Effect of Wind on Armor Stone Stability

A Study on the Characteristics of Beach Profile Evolution According to the Particle Size Variation of Beach Nourishment

A Study on the Application of Low Crest Structures to Reduce Wave Overtopping

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