SIMULATION OF WAVE DYNAMICS AND SCOURING NEAR COASTAL STRUCTURES BY A NUMERICAL MODEL

2003 ◽  
Author(s):  
Thanh Ca VU ◽  
Yoshimichi YAMAMOTO ◽  
Katsutoshi TANIMOTO ◽  
Junichi ARIMURA
Keyword(s):  
Numerical Model ◽  
Coastal Structures ◽  
Wave Dynamics

scholarly journals 3D Numerical Simulation of the Interaction between Waves and a T-Head Groin Structure

2020 ◽  
Vol 8 (3) ◽  
pp. 227
Author(s):  
Giovanni Cannata ◽  
Marco Tamburrino ◽  
Francesco Gallerano
Keyword(s):  
Numerical Model ◽  
Numerical Scheme ◽  
Wave Motion ◽  
Stokes Equations ◽  
Wave Train ◽  
Three Dimensional ◽  
Solid Material ◽  
Coastal Structures ◽  
Vertical Coordinate ◽  
Hydrodynamic Fields

The aim of coastal structures for the defense from erosion is to modify the hydrodynamic fields that would naturally occur with the wave motion, to produce zones of sedimentation of solid material, and to combat the recession of the coastline. T-head groin-shaped structures are among the most adopted in coastal engineering. The assessment of the effectiveness of such structures requires hydrodynamic study of the interaction between wave motion and the structure. Hydrodynamic phenomena induced by the interaction between wave motion and T-head groin structures have three-dimensionality features. The aim of the paper is to propose a new three-dimensional numerical model for the simulation of the hydrodynamic fields induced by the interaction between wave fields and coastal structures. The proposed model is designed to represent complex morphologies as well as coastal structures inside the domain. The numerical scheme solves the three-dimensional Navier–Stokes equations in a contravariant formulation, on a time-dependent coordinate system, in which the vertical coordinate varies over time to follow the free-surface elevation. The main innovative element of the paper consists in the proposal of a new numerical scheme that makes it possible to simulate flows around structures with sharp-cornered geometries. The proposed numerical model is validated against a well-known experimental test-case consisting in a wave train approaching a beach (non-parallel with the wave front), with the presence of a T-head groin structure. A detailed comparison between numerical and experimental results is shown.

A numerical model for the influence of a radial electric field on spiral wave dynamics

1993 ◽  
Vol 69 (3-4) ◽  
pp. 309-319 ◽  
Author(s):  
J.L.F. Porteiro ◽  
V. Pérez-Muñuzuri ◽  
A.P. Muñuzuri ◽  
V. Pérez-Villar
Keyword(s):  
Numerical Model ◽  
Electric Field ◽  
Spiral Wave ◽  
Radial Electric Field ◽  
Wave Dynamics

scholarly journals The Reproduction Ability of a Numerical Model for Simulating the Outflow Rate of Backfilling Materials from a Coastal Structure

2019 ◽  
Vol 7 (12) ◽  
pp. 447
Author(s):  
Kornvisith Silarom ◽  
Yoshimichi Yamamoto
Keyword(s):  
Numerical Model ◽  
Water Depth ◽  
Fluid Motion ◽  
Wave Forces ◽  
Empirical Equations ◽  
Coastal Structures ◽  
Large Wave ◽  
Coastal Structure ◽  
Outflow Rate ◽  
Shallow Area

In very shallow areas, the frequency by which coastal structures (like dikes and seawalls) are directly broken by large wave forces is low because large waves are broken in deeper areas. The main cause for such destruction is ground scour in front of the structures and outflow of backfilling materials by middle-scale waves; therefore, the scour and the outflow should be considered when designing a coastal structure in a very shallow area. In this paper, a numerical model consisting of CADMAS-SURF, which can calculate fluid motion in porous media, and empirical equations for simulating the outflow phenomena are introduced; thereafter, practical calculations on field cases in Thailand and Japan are demonstrated. Additionally, since the effects of wave periods and water depth to the outflow rate have never been clarified, hydraulic model experiments, empirical calculations using an existing formula, and numerical simulations are performed in order to examine these effects on the outflow rate. The simulated results using the numerical model align well with the experimental results. Moreover, both results show that the outflow rate is proportional to the wave period and inversely proportional to water depth.

scholarly journals ANALYSIS OF WAVE RUN UP DYNAMICS AT JOGEHAMA BEACH JAPAN

2018 ◽  
pp. 68
Author(s):  
Naoyuki Inukai ◽  
Masaya Shinohara ◽  
Tokimitsu Ochiai ◽  
Hiroshi Yamamoto
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Two Dimensional ◽  
Wave Condition ◽  
Wave Dynamics ◽  
Geographic Feature ◽  
Wave Heights ◽  
Aerial Vehicle ◽  
Significant Wave Heights ◽  
Run Up

The big wave suddenly arrived at the beach, Niigata prefecture Japan in May 2014. And three children were carried off to the sea by the wave, though they played on the beach. When the accident occurred, the significant wave heights was 1.2m, and the wave period was 7.9 seconds. The beach characteristic topography has the cusp topography and steep slope. We tried to understand the reason why this accident occurred. Firstly, we reproduced the wave condition when the accident occurred. Secondary, we made the survey to understand the geographic feature of the beach. After the survey, we obtained the geographic data for the numerical simulation from the aerial photograph which were taken by UAV (Unmanned aerial vehicle). Finally, we comprehended the wave dynamics on the beach by the numerical simulation. We simulated the wave dynamics by the horizontal two dimensional numerical model and the vertical two dimensional numerical model.

scholarly journals Numerical modeling of the 1964 Alaska tsunami in western Passage Canal and Whittier, Alaska

2010 ◽  
Vol 10 (12) ◽  
pp. 2489-2505 ◽  
Author(s):  
D. J. Nicolsky ◽  
E. N. Suleimani ◽  
R. A. Hansen
Keyword(s):  
Numerical Modeling ◽  
Numerical Model ◽  
Numerical Experiments ◽  
The Other ◽  
Submarine Landslides ◽  
Wave Dynamics ◽  
Eyewitness Reports ◽  
Northern Shore ◽  
The City ◽  
1964 Alaska

Abstract. A numerical model of the wave dynamics in Passage Canal, Alaska during the Mw 9.2 megathrust earthquake is presented. During the earthquake, several types of waves were identified at the city of Whittier, located at the head of Passage Canal. The first wave is thought to have been a seiche, while the other two waves were probably triggered by submarine landslides. We model the seiche wave, landslide-generated tsunami, and tectonic tsunami in Passage Canal and compute inundation by each type of wave during the 1964 event. Modeled results are compared with eyewitness reports and an observed inundation line. Results of the numerical experiments let us identify where the submarine landslides might have occurred during the 1964 event. We identify regions at the head and along the northern shore of Passage Canal, where landslides triggered a wave that caused most of the damage in Whittier. An explanation of the fact that the 1964 tectonic tsunami in Whittier was unnoticed is presented as well. The simulated inundation by the seiche, landslide-generated tsunami, and tectonic tsunami can help to mitigate tsunami hazards and prepare Whittier for a potential tsunami.

A 3D Numerical Model for Free Interfacial Flows and Applications to Offshore Waves with Submerged Obstacles

2013 ◽  
Vol 444-445 ◽  
pp. 544-548
Author(s):  
Bin Xie ◽  
Feng Xiao
Keyword(s):  
Numerical Model ◽  
Fluid Flows ◽  
Interfacial Flows ◽  
Coastal Structures ◽  
Moving Interfaces ◽  
Benchmark Tests ◽  
Dam Break Flow ◽  
Practical Tool ◽  
3D Numerical Model ◽  
Volume Method

A 3D numerical model for incompressible multi-fluid flows has been developed by using a multi-moment finite volume method and an accurate and efficient VOF type scheme for capturing moving interfaces of multi-fluids. The numerical model is validated with the theoretical and experimental results of the benchmark tests of solitary wave and dam break flow, which indicates the adequate numerical accuracy of the model as a practical tool to assess and predict offshore waves and their impacts on coastal structures. Numerical experiments have been systematically conducted to investigate wave breaking phenomena and the impacts on seawalls.

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