scholarly journals STABILITY ANALYSIS OF RUBBLE-MOUND BREAKWATERS UNDER TSUNAMI FIRST IMPACT AND OVERFLOW

2018 ◽  
pp. 43
Author(s):  
Íñigo Aniel-Quiroga ◽  
César Vidal ◽  
Mauricio González ◽  
Javier L. Lara
Keyword(s):  
Stability Analysis ◽  
Scientific Community ◽  
Tsunami Wave ◽  
Coastal Protection ◽  
Coastal Structures ◽  
Marine Structures ◽  
Physical Experiments ◽  
Rubble Mound ◽  
Rubble Mound Breakwaters ◽  
The Eu

Tsunamis are relatively infrequent but very destructive phenomena that can cause devastating consequences on coastal areas. In view of recent tragic episodes, the scientific community is strengthening their efforts to develop strategies to mitigate the risk of tsunami consequences, specially focused on the potentially affected areas. One of the strategies in this direction is the design and construction of more efficient coastal structures. In this way, in the frame of the EU FP7 project ASTARTE physical experiments on rubble-mound breakwaters (RMB) under tsunami wave attack have been carried out in the IH Cantabria facilities in Santander, Spain. These experiments focused on gaining a better understanding of tsunami impacts on this kind of structures. Improving the knowledge about their stability and hydrodynamics will contribute to a better design of coastal protection marine structures.

scholarly journals ROUGHNESS FACTOR FOR MULTI-LAYER ARMOUR AS OVERTOPPING ESTIMATOR

2020 ◽  
pp. 25
Author(s):  
Leopoldo Franco ◽  
Yuri Pepi ◽  
Stefano de Finis ◽  
Verdiana Iorio ◽  
Giorgio Bellotti ◽  
...  
Keyword(s):  
Structural Characteristics ◽  
Storm Surges ◽  
Random Wave ◽  
Roughness Factor ◽  
Coastal Structures ◽  
Wave Overtopping ◽  
Wave Flume ◽  
Physical Model Tests ◽  
Rubble Mound ◽  
Rubble Mound Breakwaters

Nowadays one of the most challenging problem for engineers is to adapt existing coastal structures to climate changes. Wave overtopping is highly sensitive to the increasing extreme water depths due to higher storm surges coupled with sea level rise. One way to face these problems for rubble mound breakwaters is to add one or more layers to the existing armour. Prediction of wave overtopping of coastal structures is presently obtained from empirical formulae in EurOtop (2018). For the case of overtopping over multi-layer armour, no validated method exists, so prediction must be based upon assumptions and judgement, with related uncertainties. This study is focused on the effects of different types of armour, the number of layer and other structural characteristics on the roughness factor f. The main effects of porosity and roughness will be investigated. This paper analyzes the results of several new physical model tests of different rubble mound breakwaters reproduced at the new medium scale random wave flume of the Department of Engineering of Roma Tre University.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/8cOdqkqQ-9s

scholarly journals Damage in Rubble Mound Breakwaters. Part I: Historical Review of Damage Models

2020 ◽  
Vol 8 (5) ◽  
pp. 317
Author(s):  
Álvaro Campos ◽  
Carmen Castillo ◽  
Rafael Molina-Sanchez
Keyword(s):  
Probabilistic Models ◽  
Management Strategies ◽  
Historical Review ◽  
Coastal Structures ◽  
Damage Development ◽  
Damage Models ◽  
Damage Progression ◽  
Rubble Mound ◽  
Rubble Mound Breakwaters

The term “damage” in rubble mound breakwaters is usually related to the foremost failure mode of this kind of coastal structures: their hydraulic instability. The characterization of the breakwater response against wave action was and will be the goal of hundreds of studies. Because of the large amount of information, the present review on damage in rubble mound breakwaters is divided in two papers, which are closely linked but conceptually different; whereas Part II is focused on the various approaches for defining and measuring damage, Part I summarizes the diverse strategies for modelling damage development and progression. The present paper compiles 146 references on this topic, chronologically discussed over almost a century of history: from 1933 to 2020. It includes 23 formulations of hydraulic stability models and 11 formulations of damage progression models, together with main advances and shortcomings up to date. The future of rubble mound design is linked to risk-based tools and advanced management strategies, for which deeper comprehension about the spatial and temporal evolution of damage during the useful life of each particular structure is required. For this aim, damage progression probabilistic models, full-scale monitoring and standardization will presumably be some of the key challenges in the upcoming years.

scholarly journals EXPERIMENTAL MODELING OF WAVE FORCES AND HYDRODYNAMICS ON ELEVATED COASTAL STRUCTURES SUBJECT TO WAVES, SURGE OR TSUNAMIS: THE EFFECT OF BREAKING, SHIELDING AND DEBRIS

2018 ◽  
pp. 53
Author(s):  
Pedro Lomonaco ◽  
Mohammad Shafiqual Alam ◽  
Pedro Arduino ◽  
Andre Barbosa ◽  
Daniel T. Cox ◽  
...  
Keyword(s):  
Tropical Cyclones ◽  
Tsunami Wave ◽  
Coastal Communities ◽  
Accurate Estimation ◽  
Coastal Protection ◽  
Wave Forces ◽  
Coastal Structures ◽  
Critical Variable ◽  
Large Numbers ◽  
Recreational Services

Coastal communities provide important economic, transport, and recreational services to large numbers of people worldwide. However, these coastal communities are vulnerable to damage by extreme events such as tropical cyclones or tsunamis. Waves and surge, as well as tsunami-wave events, may cause extensive damage to elevated structures through a combination of horizontal and vertical wave and surge-induced forces. Structural elevation has been shown to be a critical variable affecting damage and loss. Recent efforts have been made to retrofit structures or improve coastal protection and damage mitigation plans in coastal communities to increase community resilience. However, to effectively retrofit old structures or design new structures to resist damage due to hurricanes or tsunamis, engineers require an accurate estimation of both the wave hydrodynamics and the resulting loads.

scholarly journals A NEW REDUCTIVE FACTOR FOR THE WAVE OVERTOPPING DISCHARGE AT CROWN WALLS BASED ON GENETIC PROGRAMMING

2020 ◽  
pp. 9
Author(s):  
Sara Mizar Formentin ◽  
Barbara Zanuttigh
Keyword(s):  
Genetic Programming ◽  
Coastal Structures ◽  
Design Factor ◽  
Wave Overtopping ◽  
Coastal Defense ◽  
Rubble Mound ◽  
Ultimate Objective ◽  
Rubble Mound Breakwaters

The upgrade of existing coastal defense structures by including crown walls and parapets may represent an effective and economic solution to reduce the wave overtopping discharge. Recently, a coefficient gs_GP for the parametrization of the effects induced by berms or promenades, crown walls and parapets on the average q has been developed. The formula for gs_GP was obtained from the Genetic Programming (GP) technique and was conceived to be included in the q formulae by EurOtop Manual (2018). The formula has been applied so far only to smooth dikes with crown walls. The aim of this contribution is to investigate the extension of the formula for gs_GP to a wider range of coastal structures, such as crown walls on top of rubble mound breakwaters and vertical seawalls. The ultimate objective is to provide a new design factor to be used in the EurOtop formulae.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/2xWPJeXPRco

scholarly journals Investigation on the Reflection Coefficient for Seawalls Protected by a Rubble Mound Structure

2021 ◽  
Vol 9 (9) ◽  
pp. 937
Author(s):  
Luigi Pratola ◽  
Antonio Rinaldi ◽  
Matteo Gianluca Molfetta ◽  
Maria Francesca Bruno ◽  
Davide Pasquali ◽  
...  
Keyword(s):  
Reflection Coefficient ◽  
Wave Reflection ◽  
Experimental Tests ◽  
Coastal Protection ◽  
Empirical Formulas ◽  
New Approach ◽  
Wave Flume ◽  
Mound Structure ◽  
Rubble Mound ◽  
Rubble Mound Breakwaters

Sea wave reflection from coastal protection structures is one of the main issues in the coastal design process. Several empirical formulas have been proposed so far to predict reflection coefficient from rubble mound breakwaters and smooth slopes. The aim of this study is to investigate wave reflection from a rubble mound structure placed in front of a vertical concrete seawall. Several experimental tests were performed on a two-dimensional wave flume by reproducing on a rubble mound structure with a steep single primary layer armored with a novel artificial unit. A new approach for the prediction of the reflection coefficient based on dimensional analysis is also proposed, and a new empirical equation is derived. The performance of the proposed equation was compared with widespread existing formulas, and a good accuracy was found.

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