Journal of Tropical Oceanography ›› 2023, Vol. 42 ›› Issue (6): 63-73.doi: 10.11978/2023033CSTR: 32234.14.2023033

• Marine Hydrology • Previous Articles     Next Articles

Numerical simulation study of the influences of onshore wind on overtopping characteristics of coastal seawall under focused wave

ZHANG Liangbin1(), QU Ke1,2,3(), HUANG Jingxuan1, WANG Xu1, GUO Lei1   

  1. 1. School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, China
    2. Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha 410114, China
    3. Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha 410114, China
  • Received:2023-03-14 Revised:2023-04-23 Online:2023-11-10 Published:2023-04-26
  • Supported by:
    National Key Research and Development Program of China(2022YFC3103601); National Natural Science Foundation of China(51839002); The Natural Science Foundation of Hunan Province, China(2021JJ20043)

Abstract:

In some harsh ocean environments, there are complex interactions between extreme waves and onshore winds that seriously threaten the safety of coastal facilities. Based on two-dimensional incompressible two-phase flow numerical model, this paper systematically studied the influences of onshore wind on overtopping characteristics of coastal seawall under focused wave, and focused on the mechanism of influences of onshore wind speed, significant wave height, and crest freeboards on overtopping hydrodynamic process of coastal seawall under focused wave. The research results show that, with the increase of onshore wind speeds, significant wave heights, and the decrease of crest freeboards, the maximum overtopping volume, maximum runup height, maximum hydrodynamic forces exerted at the coastal seawall, and spatial distributions of the maximum water elevation gradually increase. Onshore winds can affect the propagation and evolution of focused waves, increase the wave steepness and the propagation speed of focused waves, and cause the moment and position of wave breaking to advance. The high-speed flow area of focused waves also significantly increases. Compared with the no-wind condition, the maximum wave overtopping volume, maximum runup height, maximum hydrodynamic forces and spatial distributions of the maximum water elevation are increased under onshore winds. The research results of this paper can provide corresponding reference for the prevention and reduction of extreme waves and the design of coastal protection engineering.

Key words: onshore wind, focused wave, maximum overtopping volume, seawall, hydrodynamic characteristics