Journal of Marine Science and Engineering

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Dear Colleagues,

This Special Issue is devoted to nonconventional environmentally friendly solutions for beach and dune protection and development. This includes either alternative structural measures, such as artificial reefs, module dissipation by macroroughness, sand bags, porous seabeds, and living seawalls, or approaches based on naturalistic engineering (vegetated seabeds, dune grass planting), or systems combining shore protection and wave energy conversion. Gravel beach nourishments and beach drainage systems are also within the scope of the SI. Laboratory and numerical research papers are both warmly encouraged as well as case studies documenting the hydraulic and structural response of the systems in selected environments. Articles suggesting procedures for conceptual design are particularly welcome. With your valuable contribution, we hope to provide engineers and scientists communities with a detailed state of the art on this challenging research topic.

Prof. Sara Corvaro
Prof. Mariano Buccino
Guest Editors

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Keywords

nonconventional shore protection measures
environmentally friendly solutions
naturalistic engineering
combined energy conversion–shore protection systems
wave–structure interaction

Published Papers (3 papers)

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Research

21 pages, 18579 KiB

Open AccessArticle

A Composite Permeable Sloping Seawall for Effective Energy Dissipation: A Quasi-Soft Alternative Solution for Shore Protection

by Vaishnavi Dabir, Kanchan Khare and Mutukuru Gangireddy Munireddy

J. Mar. Sci. Eng. 2022, 10(10), 1423; https://doi.org/10.3390/jmse10101423 - 03 Oct 2022

Cited by 1 | Viewed by 1497

Abstract

The recent trend in coastal research centers around environmental sustainability, especially in coastal conservation. A seawall typically has three layers, namely core, filter, and hard rubble/concrete armor. In the current study, a two-layered seawall is proposed, comprising a coir geotextile roll from the coastal regions, along with sand encapsulated in a geotextile over an impermeable core. This can be considered as a quasi-soft solution against the traditional, three-layered, hard alternative. The objective of this study is to investigate the combined effect of slope and porosity, of this composite structure, on the wave reflection. The findings show that the composite structure provides less reflection coefficient values compared to traditional rubble mound seawalls. Four orientations and positions of coir rolls with geosynthetic sandbag were tested. The armor layer with coir rolls overlain by geosynthetic sandbags over an impermeable core could be a better alternative, as it increases the hydrodynamic performance by 59% as compared to sandbags, used alone, over an impermeable core on a slope of 1:2. Full article

(This article belongs to the Special Issue Non-conventional Coastal Protection Solutions)

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25 pages, 8726 KiB

Open AccessArticle

Hydraulic Performance of Geotextile Sand Containers for Coastal Defenses

by Sara Corvaro, Carlo Lorenzoni, Alessandro Mancinelli, Francesco Marini and Stefania Rocchi

J. Mar. Sci. Eng. 2022, 10(9), 1321; https://doi.org/10.3390/jmse10091321 - 18 Sep 2022

Viewed by 1662

Abstract

Laboratory experiments were performed in the wave flume of the Laboratorio di Idraulica e Costruzioni Marittime of the Università Politecnica delle Marche (Ancona, Italy) to study the hydrodynamic performance of coastal protection structures made of a new type of geotextile sand containers (GSCs). Such structures are used as softer and flexible alternatives to traditional hard coastal defenses made of concrete or rubble mound material. The GSC structures can also be used as temporary coastal protections during the winter period. The physical model reproduced two main configurations: in the former one, the GSCs were used as coastal revetments with three different slopes. In the latter one, the GSCs were applied to make detached submerged breakwaters with different submergences and berm widths. The geometric scale of the models was 1:10, and the weight of each GSC in the prototype was 5 t. The geotextile material of the containers and the wave characteristics were reproduced by using the Reynolds and the Froude similarity criteria, respectively. Reflection coefficients and hydraulic stability behaviors for the revetments, as well as transmission coefficients and piling-up amount for breakwaters, were obtained. Full article

(This article belongs to the Special Issue Non-conventional Coastal Protection Solutions)

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19 pages, 1439 KiB

Open AccessArticle

Beach Drainage System: A Comprehensive Review of a Controversial Soft-Engineering Method

by Piera Fischione, Davide Pasquali, Daniele Celli, Carmine Di Nucci and Marcello Di Risio

J. Mar. Sci. Eng. 2022, 10(2), 145; https://doi.org/10.3390/jmse10020145 - 22 Jan 2022

Cited by 5 | Viewed by 3612

Abstract

The beach drainage can be included among the soft engineering methods aimed to counteract the shoreline retreat related to the sediment redistribution along the beach profile. The idea that the groundwater table plays a role in the mobilization of the sediment grains underlies the application of the beach drainage system (BDS) as a tool able to modify the natural dynamics of groundwater table at sandy beaches. Indeed, BDS consists of a series of alongshore buried drains aimed to lower the groundwater table. Due to the drainage, the thickening of the layer of dry sand makes the solid grains less prone to be mobilized by the action of the waves at the swash zone, where interaction phenomena between the percolating and the incoming water lens take place. This tool had a troubled history. Its first applications were encouraging. Since then, controversial performances of both experimental and prototype scale experiences have been observed around the world. This paper aims to present an up-to-date full review of the studies and experiments carried out so far, in order to provide the reader with a complete perspective on its strength and weakness as well as open challenges to be faced in the near future. Full article

(This article belongs to the Special Issue Non-conventional Coastal Protection Solutions)

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