采掘坑对孤立波岸礁水动力特性影响的三维数值模拟研究

doi:10.11978/2023005

Abstract

Abstract:

Based on a non-hydrostatic wave model, a series of three-dimensional high-precision numerical calculations were carried out, and the influence mechanism of artificial excavation pit on the hydrodynamic characteristics of solitary wave over fringing reef was analyzed in depth by comprehensively considering the influence of incident wave height, water depth, the width and location of the excavation pit. The calculation results show that the artificial excavation pit has a certain blocking effect on the propagation of solitary waves on the fringing reef, resulting in a significant increase in the local wave height near the excavation pit, and also causing the wave height near the shoreline to decrease. The maximum rate of increase in local wave height is affected by the incident wave height, submergence water depths of the reef, and the width and location of the excavation pit. The greater the incident wave height, the greater the maximum rate of increase in local wave height, the greater the submergence water depths of the reef, the smaller maximum rate of increase in local wave height, the larger the width of the excavation pit, and the greater the maximum rate of increase in local wave height. In addition, the presence of the excavation pit reduces the maximum wave runup height, but changes in the width and position of the excavation pit have a limited effect on maximum wave runup height.

Key words: excavation pit, solitary wave, fringing reef, hydrodynamic characteristics, non-hydrostatic wave model

LI Junjie, QU Ke, WANG Xu. Three-dimensional numerical simulation of the influence of excavation pit on the hydrodynamic characteristics of solitary wave on fringing reef[J].Journal of Tropical Oceanography, 2023, 42(6): 42-51.

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工况	入射波高/m	礁坪水深/m	采掘坑宽度/m	采掘坑位置/m
A₁	0.0423	0.04	0	0
A₂	0.06345	0.04	0	0
A₃	0.0846	0.04	0	0
A₄	0.10575	0.04	0	0
A₅	0.1269	0.04	0	0
B₁	0.0423	0.04	0.8	2.5
B₂	0.06345	0.04	0.8	2.5
B₃	0.0846	0.04	0.8	2.5
B₄	0.10575	0.04	0.8	2.5
B₅	0.1269	0.04	0.8	2.5
C₁	0.0846	0	0	0
C₂	0.0846	0.02	0	0
C₃	0.0846	0.06	0	0
C₄	0.0846	0.08	0	0
C₅	0.0846	0.1	0	0
D₁	0.0846	0	0.8	2.5
D₂	0.0846	0.02	0.8	2.5
D₃	0.0846	0.06	0.8	2.5
D₄	0.0846	0.08	0.8	2.5
D₅	0.0846	0.1	0.8	2.5
E₁	0.0846	0.04	0.4	2.5
E₂	0.0846	0.04	0.6	2.5
E₃	0.0846	0.04	1.0	2.5
E₄	0.0846	0.04	1.2	2.5
F₁	0.0846	0.04	0.8	0.4
F₂	0.0846	0.04	0.8	1.45
F₃	0.0846	0.04	0.8	3.55
F₄	0.0846	0.04	0.8	4.6

Three-dimensional numerical simulation of the influence of excavation pit on the hydrodynamic characteristics of solitary wave on fringing reef

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