Matteo Centorami , Alessandro Romano , Claudia Cecioni , Giorgio Bellotti
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引用次数: 0
Abstract
Retreated wave walls are often used to improve the hydrodynamic performance of composite vertical breakwaters placed in relatively deep-water conditions. The wall retreat changes significantly the dynamics of wave-structure interaction, making the current design criteria not adequate for such structures. Previous experimental findings highlight that these processes are governed by the complex hydrodynamics driven by the characteristics of post-overtopping flows occurring on the superstructure between the seaward edge of the caisson trunk and the wave wall. In this article a new 2D experimental campaign has been carried out to explore the hydrodynamics of post-overtopping flows on composite vertical breakwaters with retreated wave wall. To improve the overall understanding of the phenomena, these flows have been analyzed and classified into three distinct types, based on wave characteristics and structural parameters, namely: Dam break (DB), Plunging-Dam break (PDB), and Hammer-Fist (HF). Then, the characteristics of each event type have been studied as a function of the wave wall retreat position. To this end, an advanced image-clustering analysis technique has been applied to visualize the process and estimate those quantities which are difficult to measure with direct measurement techniques (e.g., air content). Moreover, wave-induced loads on the wall and downfall pressures have been measured, allowing to explore how different flow types, wall retreats, and aeration levels could affect impact loads and flow dynamics. The detailed analysis of the post-overtopping flows dynamics, combined with the measurements of the forces acting on the wave wall, allowed to obtain a comprehensive parameters map, based on the flows classification and geometrical dimensions, which contributes to the development of practical design tools for such structures.
期刊介绍:
Coastal Engineering is an international medium for coastal engineers and scientists. Combining practical applications with modern technological and scientific approaches, such as mathematical and numerical modelling, laboratory and field observations and experiments, it publishes fundamental studies as well as case studies on the following aspects of coastal, harbour and offshore engineering: waves, currents and sediment transport; coastal, estuarine and offshore morphology; technical and functional design of coastal and harbour structures; morphological and environmental impact of coastal, harbour and offshore structures.