A numerical model of beach morphological evolution due to waves and currents in the vicinity of coastal structures

2011 ◽  
Vol 58 (9) ◽  
pp. 863-876 ◽  
Author(s):  
Pham Thanh Nam ◽  
Magnus Larson ◽  
Hans Hanson ◽  
Le Xuan Hoan
Keyword(s):  
Numerical Model ◽  
Morphological Evolution ◽  
Coastal Structures ◽  
Waves And Currents

scholarly journals Modelling of sediment transport and morphological evolution under the combined action of waves and currents

Ocean Science ◽  
2017 ◽  
Vol 13 (5) ◽  
pp. 673-690 ◽  
Author(s):  
Guilherme Franz ◽  
Matthias T. Delpey ◽  
David Brito ◽  
Lígia Pinto ◽  
Paulo Leitão ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Morphological Changes ◽  
Morphological Evolution ◽  
Research Effort ◽  
Beach Erosion ◽  
Model Complexity ◽  
Invariant Equilibrium ◽  
Waves And Currents ◽  
Combined Action ◽  
Modelling System

Abstract. Coastal defence structures are often constructed to prevent beach erosion. However, poorly designed structures may cause serious erosion problems in the downdrift direction. Morphological models are useful tools to predict such impacts and assess the efficiency of defence structures for different scenarios. Nevertheless, morphological modelling is still a topic under intense research effort. The processes simulated by a morphological model depend on model complexity. For instance, undertow currents are neglected in coastal area models (2DH), which is a limitation for simulating the evolution of beach profiles for long periods. Model limitations are generally overcome by predefining invariant equilibrium profiles that are allowed to shift offshore or onshore. A more flexible approach is described in this paper, which can be generalised to 3-D models. The present work is based on the coupling of the MOHID modelling system and the SWAN wave model. The impacts of different designs of detached breakwaters and groynes were simulated in a schematic beach configuration following a 2DH approach. The results of bathymetry evolution are in agreement with the patterns found in the literature for several existing structures. The model was also tested in a 3-D test case to simulate the formation of sandbars by undertow currents. The findings of this work confirmed the applicability of the MOHID modelling system to study sediment transport and morphological changes in coastal zones under the combined action of waves and currents. The same modelling methodology was applied to a coastal zone (Costa da Caparica) located at the mouth of a mesotidal estuary (Tagus Estuary, Portugal) to evaluate the hydrodynamics and sediment transport both in calm water conditions and during events of highly energetic waves. The MOHID code is available in the GitHub repository.

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

A NEW INTERNATIONAL STANDARD FOR “ACTIONS FROM WAVES AND CURRENTS ON COASTAL STRUCTURES”

2007 ◽  
Author(s):  
Alf Tørum ◽  
Hans Burcharth ◽  
Yoshimi Goda ◽  
Andreas Kortenhaus ◽  
David Kriebel
Keyword(s):  
Coastal Structures ◽  
International Standard ◽  
Waves And Currents

scholarly journals Modelling of sediment transport and morphological evolution under the combined action of waves and currents

2017 ◽  
Author(s):  
Guilherme Franz ◽  
Matthias T. Delpey ◽  
David Brito ◽  
Lígia Pinto ◽  
Paulo Leitão ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Morphological Changes ◽  
Morphological Evolution ◽  
Research Effort ◽  
Beach Erosion ◽  
Model Complexity ◽  
Invariant Equilibrium ◽  
Waves And Currents ◽  
Combined Action ◽  
Modelling System

Abstract. Coastal defence structures are often constructed to prevent beach erosion. However, poorly designed structures may cause serious erosion problems in the downdrift direction. Morphological models are useful tools to predict such impacts and assess the efficiency of defence structures for different scenarios. Nevertheless, morphological modelling is still a topic under intense research effort. The processes simulated by a morphological model depend on model complexity. For instance, undertow currents are neglected in coastal area models (2DH), which is a limitation for simulating the evolution of beach profiles for long periods. Model limitations are generally overcome by predefining invariant equilibrium profiles that are allowed to shift offshore or onshore. A more flexible approach is described in this paper, which can be generalised to 3D models. The present work is based on the coupling of the MOHID modelling system and SWAN wave model. The impacts of different designs of detached breakwaters and groynes were simulated in a schematic beach configuration following a 2DH approach. The results of bathymetry evolution are in agreement with the patterns found in the literature for several existing structures. The model was also tested in a 3D test case to simulate the formation of sandbars by undertow currents. The findings of this work confirmed the applicability of the MOHID modelling system to study sediment transport and morphological changes in coastal zones under the combined action of waves and currents. The same modelling methodology was applied to a coastal zone (Costa da Caparica) located at the mouth of a mesotidal estuary (Tagus Estuary, Portugal) to evaluate the hydrodynamics and sediment transport in calm water conditions and during events of highly energetic waves.

COASTAL ENGINEERING 2000

2000 ◽  
Vol 1 (27) ◽  
Author(s):  
Billy L. Edge
Keyword(s):  
Wind Waves ◽  
Storm Surges ◽  
Coastal Engineering ◽  
Coastal Processes ◽  
Coastal Structures ◽  
Wave Groups ◽  
Coastal Waves ◽  
Waves And Currents ◽  
The Individual ◽  
Engineering Projects

*** Available Only Through ASCE *** http://ascelibrary.aip.org/browse/asce/vol_title.jsp?scode=C This Proceedings contains more than 300 papers presented at the 27th International Conference on Coastal Engineering, which was held in Sydney, Australia, 16-21 July 2000. The Proceedings is divided into five parts: characteristics of coastal waves and currents; long period waves, storm surges and wave groups; coastal structures; coastal processes and sediment transport; and coastal, estuarine, and environmental problems. The individual papers include such topics as the effects of wind, waves, storms, and currents as well as the study of sedimentation, erosion, and beach nourishment. Special emphasis is given to case studies of completed engineering projects. With the inclusion of both theoretical and practical information, these papers provide the civil engineer and professionals in related fields with a broad range of information on coastal engineering and coastal processes affecting design and operations in the coastal zone.This Proceedings contains more than 300 papers presented at the 27th International Conference on Coastal Engineering, which was held in Sydney, Australia, 16-21 July 2000. The Proceedings is divided into five parts: characteristics of coastal waves and currents; long period waves, storm surges and wave groups; coastal structures; coastal processes and sediment transport; and coastal, estuarine, and environmental problems. The individual papers include such topics as the effects of wind, waves, storms, and currents as well as the study of sedimentation, erosion, and beach nourishment. Special emphasis is given to case studies of completed engineering projects. With the inclusion of both theoretical and practical information, these papers provide the civil engineer and professionals in related fields with a broad range of information on coastal engineering and coastal processes affecting design and operations in the coastal zone.This Proceedings contains more than 300 papers presented at the 27th International Conference on Coastal Engineering, which was held in Sydney, Australia, 16-21 July 2000. The Proceedings is divided into five parts: characteristics of coastal waves and currents; long period waves, storm surges and wave groups; coastal structures; coastal processes and sediment transport; and coastal, estuarine, and environmental problems. The individual papers include such topics as the effects of wind, waves, storms, and currents as well as the study of sedimentation, erosion, and beach nourishment. Special emphasis is given to case studies of completed engineering projects. With the inclusion of both theoretical and practical information, these papers provide the civil engineer and professionals in related fields with a broad range of information on coastal engineering and coastal processes affecting design and operations in the coastal zone. *********** This volume was originally published by ASCE. ASCE database link, for record and hard copy purchase: http://cedb.asce.org/cgi/WWWdisplay.cgi?126156

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.

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