Proceedings of the Thirty-second (2022) International Ocean and Polar Engineering Conference
Shanghai, China, June 5–10, 2022
Copyright © 2022 by the International Society of Offshore and Polar Engineers (ISOPE)
ISBN 978-1-880653-81-4; ISSN 1098-6189

www.isope.org

Numerical study of solitary wave run-up on seawallaXiaoyu Xia a, b, c, Enjin Zhao*, a, b, c, Lin Mu a, d, Kui Zhu e

Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, Chinab
College of Marine Science and Technology, China University of Geosciences, Wuhan, Chinac
Shenzhen Research Institute, China University of Geosciences, Shenzhen, Chinad
College of Life Science and Oceanography, Shenzhen University, Shenzhen, Chinae
College of Electrical Engineering, Naval University of Engineering, Wuhan, China

ABSTRACTof natural disasters caused by extreme sea conditions (Takagi andBricker, 2014). However, as the seawall operation time increases, someproblems are also exposed. After experiencing extreme sea conditions
such as tsunami and huge waves, seawall is prone to seepage andstructural cracking (Shimozono and Sato, 2016).
Therefore, many early scholars have carried out a large number ofphysical model tests on the coupling between seawalls and seawater.
They accumulated relevant test data and derived some empiricalformulas suitable for typical sections. However, the physical model test
method has the disadvantages of long cycle, high cost and complex
design. The empirical formula derived from the test also has a narrow
application area. With the rapid development of computational fluid
dynamics and computer simulation technology, numerical simulation ismore and more applied in the study of fluid-solid coupling. Zhao (2020)studied the impact of tsunami wave on coastal bridge deck throughnumerical simulation technology. Zhao (2021) studied the influence ofsolitary waves and ocean currents on the hydrodynamic and scouring ofsubmarine pipelines. These studies are difficult to draw from physicalexperiments. This fully proves the convenience of numerical simulation.
Therefore, scholars have done a lot of research on the interaction
between seawall and fluid by means of numerical simulation based on
physical model tests. Losada (1996) studies the interaction between
waves and submerged seawalls. Losada takes full account of theinfluence of structural size, porosity and wave height of the seawall.
Losada compared the results of irregular wave simulation with those ofregular wave simulation at one-way and different incident angles.
Losada provides a reference basis for stability analysis of submerged
embankment. Lin and Liu (1998) are based on Reynolds equation andk-ε Model. Lin uses Volume of Fluid (VOF) method to track themovement of free liquid level. Lin studied the propagation, climbing
and wave run-up on sloping embankments. Ruggiero and McDougal(1998) developed an analytical model to predict coastal hydrodynamic
and sediment transport on a flat beach supported by a seawall. Huang(2003) used the two-dimensional unsteady N-S equation to simulate theinteraction process between solitary wave and permeable submerged
seawall. Huang discussed the effects of wave height, seawall aspectratio and porosity on their interaction. He analyzed the velocity,

Seawall is one of the most important coastal infrastructures towithstand and reduce the harm of extreme sea condition. However, thestrong interaction between seawall and waves in extreme weather iseasy to cause instability and fracture of the artificial protective block
and protective layer of seawall surface. In extreme cases such as
tsunami waves, the wave height increases sharply when the nearshore
water depth becomes shallower. Tsunami waves with great energy runup the seawall. Tsunami waves interact with land and cause greatdamage. Therefore, the investigation on the hydrodynamic
characteristics of tsunami waves during its propagation and run-up is asignificant aspect to reveal the influence mechanism and decrease therisk. In this article, solitary wave is used instead of extreme sea
conditions such as tsunami waves. In order to guarantee the accuracy ofthe calculation, this model is verified through the comparison between
the numerical and experimental data. In this numerical simulation, theeffects of solitary wave with different prominent conditions including
wave height and submersion on wave run-up is studied. This paper
analyzes the hydrodynamic characteristics of seawall slope protection
surface. The distribution law of hydrodynamic load and instability
mechanism of typical seawall slope protection structure are discussed.
At the same time, this study obtains the trajectory law of water quality
points under the influence of solitary wave. The analysis results canprovide reference for seawall construction. This study can deepen theunderstanding of the interaction between solitary waves and marine
infrastructure.

KEY WORDS: Solitary wave, Wave run-up; Seawall, Numericalsimulation

INTRODUCTION
The seawall is an important social infrastructure for coastal areas todefend against wind and tide. The seawall is an important barrier toprotect the land from marine hazards. As the first barrier along thecoastline, seawalls make a significant contribution to reducing the risk

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