Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Numerical Investigation of Countermeasure Effects on Overland Flow Hydrodynamic and Force Mitigation in Coastal Communities

  • Hai Van, Dang (Department of Marine Science and Convergent Technology, Hanyang University ERICA) ;
  • Sungwon, Shin (Department of Marine Science and Convergent Technology, Hanyang University ERICA) ;
  • Eunju, Lee (Department of Marine Science and Convergent Technology, Hanyang University ERICA) ;
  • Hyoungsu, Park (Department of Civil and Environmental Engineering, University of Hawaii at Manoa) ;
  • Jun-Nyeong, Park (Department of Marine Science and Convergent Technology, Hanyang University ERICA)
  • Received : 2022.10.24
  • Accepted : 2022.12.01
  • Published : 2022.12.31
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Abstract

Coastal communities have been vulnerable to extreme coastal flooding induced by hurricanes and tsunamis. Many studies solely focused on the overland flow hydrodynamic and loading mechanisms on individual inland structures or buildings. Only a few studies have investigated the effects of flooding mitigation measures to protect the coastal communities represented through a complex series of building arrays. This study numerically examined the performance of flood-mitigation measures from tsunami-like wave-induced overland flows. A computational fluid dynamic model was utilized to investigate the performance of mitigation structures such as submerged breakwaters and seawalls in reducing resultant forces on a series of building arrays. This study considered the effects of incident wave heights and four geometrically structural factors: the freeboard, crest width of submerged breakwaters, and the height and location of seawalls. The results showed that prevention structures reduced inundation flow depths, velocities, and maximum forces in the inland environment. The results also indicated that increasing the seawall height or reducing the freeboard of a submerged breakwater significantly reduces the maximum horizontal forces, especially in the first row of buildings. However, installing a low-lying seawall closer to the building rows amplifies the maximum forces compared to the original seawall at the shoreline.

Keywords

Acknowledgement

This study was supported by the National Research Foundation of Korea (grant number: 2022R1F1A1071641) and the Korea Evaluation Institute of Industrial Technology (KEIT) grant, which is funded by the Korean government (KCG, MOIS, NFA) [RS-2022-001549812, Development of technology to respond to marine fires and chemical accidents using wearable devices].

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