Utilising Natural Attributes of Tropical Islands for Beach Protection

This study reveals the coastal protection benefits of small artificial reefs on tropical islands. A monitored case study involving field and computer modelling investigations, as well as construction of a 95 m long reef and 12,000 m<sup>3</sup> of local sand nourishment in a tropical lag...

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Autores principales:	Kerry Black, Derick Steinhobel
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	fringing reefs beach tropical lagoons circulation waves nourishment Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581
Acceso en línea:	https://doaj.org/article/7bd97b8523c14250a28fde1c765ba2c2
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spelling	oai:doaj.org-article:7bd97b8523c14250a28fde1c765ba2c22021-11-25T18:04:19ZUtilising Natural Attributes of Tropical Islands for Beach Protection10.3390/jmse91112082077-1312https://doaj.org/article/7bd97b8523c14250a28fde1c765ba2c22021-11-01T00:00:00Zhttps://www.mdpi.com/2077-1312/9/11/1208https://doaj.org/toc/2077-1312This study reveals the coastal protection benefits of small artificial reefs on tropical islands. A monitored case study involving field and computer modelling investigations, as well as construction of a 95 m long reef and 12,000 m<sup>3</sup> of local sand nourishment in a tropical lagoon on the north-east coast of Mauritius, is presented. Monitoring showed that a large salient widened the beach by 50 m in one year. The salient has continued to grow slowly and has remained stable for four years, including during a cyclone. Only a simple and inexpensive artificial reef was needed in the shallow lagoon to rebalance the shoreline wave conditions, because most wave energy was lost by breaking further offshore on the natural reef. With rising sea levels, inshore reefs with nourishment can overcome increases in wave height, wave set-up and wave run-up at the shoreline, which are jointly responsible for erosion and the flooding of homes by erosion and over-topping. To find suitable nourishment sources, regional computer modelling identified the following dominant circulation patterns: currents both coming into the lagoon over the reef crest (driven by breaking wave energy) and exiting via relict river channels or zones of lower waves. Sand for nourishment may be extracted from the exit locations with reduced environmental impact, because net currents are driving sand out of the lagoon system into deeper water. These relict sands have the same grain size as the natural beach and are readily accessible.Kerry BlackDerick SteinhobelMDPI AGarticlefringing reefsbeachtropical lagoonscirculationwavesnourishmentNaval architecture. Shipbuilding. Marine engineeringVM1-989OceanographyGC1-1581ENJournal of Marine Science and Engineering, Vol 9, Iss 1208, p 1208 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	fringing reefs beach tropical lagoons circulation waves nourishment Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581
spellingShingle	fringing reefs beach tropical lagoons circulation waves nourishment Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581 Kerry Black Derick Steinhobel Utilising Natural Attributes of Tropical Islands for Beach Protection
description	This study reveals the coastal protection benefits of small artificial reefs on tropical islands. A monitored case study involving field and computer modelling investigations, as well as construction of a 95 m long reef and 12,000 m<sup>3</sup> of local sand nourishment in a tropical lagoon on the north-east coast of Mauritius, is presented. Monitoring showed that a large salient widened the beach by 50 m in one year. The salient has continued to grow slowly and has remained stable for four years, including during a cyclone. Only a simple and inexpensive artificial reef was needed in the shallow lagoon to rebalance the shoreline wave conditions, because most wave energy was lost by breaking further offshore on the natural reef. With rising sea levels, inshore reefs with nourishment can overcome increases in wave height, wave set-up and wave run-up at the shoreline, which are jointly responsible for erosion and the flooding of homes by erosion and over-topping. To find suitable nourishment sources, regional computer modelling identified the following dominant circulation patterns: currents both coming into the lagoon over the reef crest (driven by breaking wave energy) and exiting via relict river channels or zones of lower waves. Sand for nourishment may be extracted from the exit locations with reduced environmental impact, because net currents are driving sand out of the lagoon system into deeper water. These relict sands have the same grain size as the natural beach and are readily accessible.
format	article
author	Kerry Black Derick Steinhobel
author_facet	Kerry Black Derick Steinhobel
author_sort	Kerry Black
title	Utilising Natural Attributes of Tropical Islands for Beach Protection
title_short	Utilising Natural Attributes of Tropical Islands for Beach Protection
title_full	Utilising Natural Attributes of Tropical Islands for Beach Protection
title_fullStr	Utilising Natural Attributes of Tropical Islands for Beach Protection
title_full_unstemmed	Utilising Natural Attributes of Tropical Islands for Beach Protection
title_sort	utilising natural attributes of tropical islands for beach protection
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/7bd97b8523c14250a28fde1c765ba2c2
work_keys_str_mv	AT kerryblack utilisingnaturalattributesoftropicalislandsforbeachprotection AT dericksteinhobel utilisingnaturalattributesoftropicalislandsforbeachprotection
_version_	1718411688222392320

Utilising Natural Attributes of Tropical Islands for Beach Protection

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