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

热带海洋学报 ›› 2023, Vol. 42 ›› Issue (6): 42-51.doi: 10.11978/2023005CSTR: 32234.14.2023005

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

李俊杰¹(), 屈科¹^,²^,³(), 王旭¹

1.长沙理工大学水利与环境工程学院, 湖南长沙 410114
2.洞庭湖水环境治理与生态修复湖南省重点实验室, 湖南长沙 410114
3.水沙科学与水灾害防治湖南省重点实验室, 湖南长沙 410114

收稿日期:2023-03-23 修回日期:2023-04-28 出版日期:2023-11-10 发布日期:2023-03-13
作者简介:
李俊杰(1997—), 男, 湖南省衡阳市人, 硕士研究生, 主要从事珊瑚礁水动力特性方面研究。email: lijunj619@163.com
基金资助:
国家重点研发计划课题(2022YFC3103601); 国家自然科学基金重点项目(51839002); 湖南省自然科学基金项目(2021JJ20043)

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

LI Junjie¹(), QU Ke¹^,²^,³(), WANG Xu¹

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:2023-03-23 Revised:2023-04-28 Online:2023-11-10 Published:2023-03-13
Supported by:
National Key Research and Development Program of China(2022YFC3103601); National Natural Science Foundation of China(51839002); Natural Science Foundation of Hunan Province, China(2021JJ20043)

摘要/Abstract

摘要：

基于非静压模型, 通过开展一系列三维高精度数值计算, 综合考虑入射波高、水深、采掘坑宽度及位置等因素的影响, 深入分析了人工采掘坑对孤立波岸礁水动力特性的影响机制。计算结果表明, 人工采掘坑对孤立波在岸礁上的传播具有一定的阻滞作用, 导致采掘坑附近的局部波高显著增加, 同时也引起岸线附近波高降低。局部波高最大增幅的大小易受入射波高、礁坪水深、采掘坑宽度和位置的影响。入射波高越大, 局部波高最大增幅越大, 礁坪水深越大, 局部波高最大增幅越小, 采掘坑宽度越大, 局部波高最大增幅越大。除此之外, 采掘坑的存在会降低波浪的最大爬高, 但是采掘坑宽度和位置的变化对波浪的最大爬高影响有限。

关键词: 采掘坑, 孤立波, 岸礁, 水动力特性, 非静压模型

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

李俊杰, 屈科, 王旭. 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[J]. 热带海洋学报, 2023, 42(6): 42-51.

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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参考文献 19

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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

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

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

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