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Article

Spatiotemporal Trends of Bora Bora’s Shoreline Classification and Movement Using High-Resolution Imagery from 1955 to 2019

1
Section des Sciences de la Vie et de la Terre, EPHE-PSL University, CNRS LETG, 35800 Dinard, France
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Département de Biologie, École Normale Supérieure, PSL University, 75005 Paris, France
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Okinawa Institute of Science and Technology, 1919-1 Tancha, Onna-Son, Kunigami District 904-0495, Okinawa, Japan
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LabEx CORAIL, 98729 Papetoai, French Polynesia, France
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Association Ia Vai Ma Noa Bora-Bora, 98730 Bora-Bora, French Polynesia, France
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Section Cadastre-Topographie de la Direction des Affaires Foncières (DAF), 98713 Papeete, French Polynesia, France
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Laboratoire de Biologie des Organismes et Ecosystèmes Aquatiques (BOREA), Université des Antilles-MNHN-CNRS 8067-SU-IRD 207-UCN, 97275 Schoelcher, Martinique, France
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ESPACE-DEV, Univ Montpellier, IRD, Univ Antilles, Univ Guyane, Univ Réunion, 34000 Montpellier, France
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Département Lettres et Sciences Humaines, University Center of Mayotte CUFR, BP53 Dembeni, Mayotte, France
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EPHE-PSL University, CRIOBE, BP 1013 Papetoai, French Polynesia, France
*
Author to whom correspondence should be addressed.
Academic Editors: Dar Roberts, Junshi Xia and Simona Niculescu
Remote Sens. 2021, 13(22), 4692; https://doi.org/10.3390/rs13224692
Received: 31 October 2021 / Revised: 15 November 2021 / Accepted: 17 November 2021 / Published: 20 November 2021
Coastal urbanisation is a widespread phenomenon throughout the world and is often linked to increased erosion. Small Pacific islands are not spared from this issue, which is of great importance in the context of climate change. The French Polynesian island of Bora Bora was used as a case study to investigate the historical evolution of its coastline classification and position from 1955 to 2019. A time series of very high-resolution aerial imagery was processed to highlight the changes of the island’s coastline. The overall length of natural shores, including beaches, decreased by 46% from 1955 to 2019 while human-made shores such as seawalls increased by 476%, and as of 2019 represented 61% of the coastline. This evolution alters sedimentary processes: the time series of aerial images highlights increased erosion in the vicinity of seawalls and embankments, leading to the incremental need to construct additional walls. In addition, the gradual removal of natural shoreline types modifies landscapes and may negatively impact marine biodiversity. Through documenting coastal changes to Bora Bora over time, this study highlights the impacts of human-made structures on erosional processes and underscores the need for sustainable coastal management plans in French Polynesia. View Full-Text
Keywords: coast; erosion; urbanisation; airborne imagery; spaceborne imagery; French Polynesia coast; erosion; urbanisation; airborne imagery; spaceborne imagery; French Polynesia
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MDPI and ACS Style

Gairin, E.; Collin, A.; James, D.; Maueau, T.; Roncin, Y.; Lefort, L.; Dolique, F.; Jeanson, M.; Lecchini, D. Spatiotemporal Trends of Bora Bora’s Shoreline Classification and Movement Using High-Resolution Imagery from 1955 to 2019. Remote Sens. 2021, 13, 4692. https://doi.org/10.3390/rs13224692

AMA Style

Gairin E, Collin A, James D, Maueau T, Roncin Y, Lefort L, Dolique F, Jeanson M, Lecchini D. Spatiotemporal Trends of Bora Bora’s Shoreline Classification and Movement Using High-Resolution Imagery from 1955 to 2019. Remote Sensing. 2021; 13(22):4692. https://doi.org/10.3390/rs13224692

Chicago/Turabian Style

Gairin, Emma, Antoine Collin, Dorothée James, Tehani Maueau, Yoann Roncin, Lucas Lefort, Franck Dolique, Matthieu Jeanson, and David Lecchini. 2021. "Spatiotemporal Trends of Bora Bora’s Shoreline Classification and Movement Using High-Resolution Imagery from 1955 to 2019" Remote Sensing 13, no. 22: 4692. https://doi.org/10.3390/rs13224692

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