Large impulsive forces on recurved parapets under non-breaking waves. A numerical study
TL;DR: In this article, the authors describe 2D numerical simulations of velocity and pressure fields generated by non-breaking waves on a vertical breakwater with a recurved parapet wall.
About: This article is published in Coastal Engineering.The article was published on 2018-06-01. It has received 58 citations till now. The article focuses on the topics: Parapet & Breaking wave.
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TL;DR: In this article, the authors investigated the intensity of the load applied by non-breaking waves on the recurved parapet wall of vertical breakwaters under both regular and irregular waves.
41 citations
TL;DR: In this paper, a method of determining the reaction forces of a vertical structure with an overhang to impulsive wave impacts is described, where the impulse of the impact is taken as the primary design variable to estimate the impulsive reaction force instead of peak impact forces.
31 citations
TL;DR: In this article, an innovative vertical breakwater cross-section integrating an overtopping wave energy converter, named OBREC-V, and the analysis of its hydraulic performance and stability response to hydraulic loading is presented.
30 citations
TL;DR: In this paper, the authors discuss the key aspects of the recent Coastal Plan of the Veneto Region (IT) and propose a single mitigation strategy for coastal erosion that is valid for the whole Veneto region, and possibly elsewhere, as well as a method to assign a priority level to any action.
Abstract: This paper discusses the key aspects of the recent Coastal Plan of the Veneto Region (IT). Its aim is to propose a single mitigation strategy for coastal erosion that is valid for the whole Veneto Region, and possibly elsewhere, as well as a method to assign a priority level to any action. The suggested mitigation action against erosion depends on urbanization level, beach width, as well as cross-shore and long-shore sediment transport. The criterion used to give a priority level to mitigation actions is based on a vulnerability index that takes into account erosive tendency, existing coastal flooding hazards, coast value, environmental relevance, tourist pressure, urbanization level, the presence of production activities, and cultural heritage. A sample case featuring the littoral of Rosolina is also provided and includes a site description, the sediment budget, critical issues and possible mitigation measures.
24 citations
Cites background from "Large impulsive forces on recurved ..."
...Seawalls, that induce a local erosion due to reflection, are cost-effective solutions to limit the overtopping, especially when the parapet is appropriately shaped [58,59]....
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TL;DR: In this article, the authors investigate the variation in the main overtopping measures when multiple wave times series generated from the same spectrum are used, and show that this variation is of a similar magnitude to both the one found with similar experiments looking at the phenomena in numerical models, and that specified by the confidence bounds in empirical methods.
Abstract: Most physical model tests carried out to quantify wave overtopping are conducted using a wave energy spectrum, which is then used to generate a free surface wave time series at the wave paddle. This method means that an infinite number of time series can be generated, but, due to the expense of running physical models, often only a single time series is considered. The aim of this work is to investigate the variation in the main overtopping measures when multiple wave times series generated from the same spectrum are used. Physical model tests in a flume measuring 15 m (length) by 0.23 m (width) with an operating depth up to 0.22 m were carried out using a stochastic approach on two types of structures (a smooth slope and a vertical wall), and a variety of wave conditions. Results show variation of overtopping discharge, computed by normalising the range of the discharges at a certain wave condition with the maximum value of the discharge in the range up to 10 % , when the same wave time series is used, but this range increases to 75 % when different time series are used. This variation is found to be of a similar magnitude to both the one found with similar experiments looking at the phenomena in numerical models, and that specified by the confidence bounds in empirical methods.
23 citations
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925 citations
"Large impulsive forces on recurved ..." refers background in this paper
...A first review concerning wave impacts on bodies and coastal structures is provided by Ramkema (1978) who highlighted that the development of mathematical wave impact and slamming models was originated by Von Karman (1929) and Wagner (1932)....
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01 Oct 1929
TL;DR: In this paper, the authors give a formula for maximum pressure during landing that permits one to apply experimental results to different bodies and different velocities, and the formula checks very well with experimental results.
Abstract: In order to make a stress analysis of seaplane floats, and especially of the members connecting the floats with the fuselage, it is of great importance to determine the maximum pressure acting on the floats during landing. Here, the author gives a formula for maximum pressures during landing that permits one to apply experimental results to different bodies and different velocities. The author notes that the formula checks very well with experimental results.
594 citations
"Large impulsive forces on recurved ..." refers background in this paper
...A first review concerning wave impacts on bodies and coastal structures is provided by Ramkema (1978) who highlighted that the development of mathematical wave impact and slamming models was originated by Von Karman (1929) and Wagner (1932)....
[...]
TL;DR: Experimental, numerical, and theoretical investigations of a normal drop impact onto a liquid film of finite thickness are presented, finding a good agreement with the numerical predictions of the phenomena.
Abstract: In the present work experimental, numerical, and theoretical investigations of a normal drop impact onto a liquid film of finite thickness are presented. The dynamics of drop impact on liquid surfaces, the shape of the cavity, the formation and propagation of a capillary wave in the crater, and the residual film thickness on the rigid wall are determined and analyzed. The shape of the crater within the film and the uprising liquid sheet formed upon the impact are observed using a high-speed video system. The effects of various influencing parameters such as drop impact velocity, liquid film thickness and physical properties of the liquids, including viscosity and surface tension, on the time evolution of the crater formation are investigated. Complementary to experiments the direct numerical simulations of the phenomena are performed using an advanced free-surface capturing model based on a two-fluid formulation of the classical volume-of-fluid (VOF) model in the framework of the finite volume numerical method. In this model an additional convective term is introduced into the transport equation for phase fraction, contributing decisively to a sharper interface resolution. Furthermore, an analytical model for the penetration depth of the crater is developed accounting for the liquid inertia, viscosity, gravity, and surface tension. The model agrees well with the experiments at the early times of penetration far from the wall if the impact velocity is high. Finally, a scaling analysis of the residual film thickness on the wall is conducted demonstrating a good agreement with the numerical predictions.
572 citations
TL;DR: In this article, the authors introduce OpenFOAM® as a tool to consider for coastal engineering applications as it solves 3D domains and considers two-phase flow, and demonstrate that active wave absorption is found to enhance stability by decreasing the energy of the system and correcting the increasing water level on long simulations.
482 citations