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Article

Natural vs. Anthropic Influence on the Multidecadal Shoreline Changes of Mediterranean Urban Beaches: Lessons from the Gulf of Cagliari (Sardinia)

1
Coastal and Marine Geomorphology Group (CMGG), Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, Cittadella Universitaria, 09042 Monserrato, Italy
2
College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK
3
Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria, 53, 56126 Pisa, Italy
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3578; https://doi.org/10.3390/w12123578
Received: 24 November 2020 / Revised: 15 December 2020 / Accepted: 16 December 2020 / Published: 20 December 2020
Urban Mediterranean beaches are often characterized by a fragile and unstable equilibrium that can be easily altered by ongoing climate change and by the increase in human pressure. This may pose serious threats to the survival of beach systems that cannot accommodate these modifications. In this paper, the spatio-temporal shift of the shoreline was investigated along two urban beaches in the Gulf of Cagliari (Poetto and Giorgino; southern Sardinia, western Mediterranean Sea) across a time frame of 62 years (1954–2016). The Digital Shoreline Analysis System (DSAS) ArcGIS™ extension was used to extract different statistical parameters which allowed us to quantify the erosion and accretion rates. These data were further examined in relation to a number of anthropic and natural forcings in order to disentangle the factors controlling shoreline evolution. Eight sectors with interchanging net erosive and accretion trends were identified along the Poetto and Giorgino beaches. In six decades, some sectors of the two study sites appeared to have undergone great shoreline modification as a result of the intense anthropogenic activities impacting these coastal areas. The westernmost portions of both beaches were found to be the most vulnerable to erosion processes; such conditions were likely controlled by the interplaying of local hydrodynamics and by the intense coastal development which affected these sectors. The highest retreat rates (mean end point rate (EPR) = −0.51/year) were recorded in the western limit of Giorgino beach. Along the western limit of Poetto beach, EPR erosion rates (mean EPR = −2.92/year) considerably increased in the years after the artificial beach nourishment carried out in 2002, suggesting that the majority of the nourished material was lost offshore or partly redistributed along the beach. Coastal structures, urban development, river catchment modification, industrial and port activities, beach cleaning and touristic and recreational activities have been identified as the ongoing causes of coastal alteration. If these factors remain constant, under projected climate change scenarios, these beaches are at risk of further increased flooding and erosion. In this context, the application of DSAS appeared as an essential tool, supporting a monitoring system able to provide understanding and, potentially, predictions of the short- to long-term evolution of these beach systems. View Full-Text
Keywords: shoreline change; beach management; coastal erosion; seagrass meadow; Gulf of Cagliari; Western Mediterranean Sea; DSAS shoreline change; beach management; coastal erosion; seagrass meadow; Gulf of Cagliari; Western Mediterranean Sea; DSAS
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MDPI and ACS Style

Biondo, M.; Buosi, C.; Trogu, D.; Mansfield, H.; Vacchi, M.; Ibba, A.; Porta, M.; Ruju, A.; De Muro, S. Natural vs. Anthropic Influence on the Multidecadal Shoreline Changes of Mediterranean Urban Beaches: Lessons from the Gulf of Cagliari (Sardinia). Water 2020, 12, 3578. https://doi.org/10.3390/w12123578

AMA Style

Biondo M, Buosi C, Trogu D, Mansfield H, Vacchi M, Ibba A, Porta M, Ruju A, De Muro S. Natural vs. Anthropic Influence on the Multidecadal Shoreline Changes of Mediterranean Urban Beaches: Lessons from the Gulf of Cagliari (Sardinia). Water. 2020; 12(12):3578. https://doi.org/10.3390/w12123578

Chicago/Turabian Style

Biondo, Manuela, Carla Buosi, Daniele Trogu, Hannah Mansfield, Matteo Vacchi, Angelo Ibba, Marco Porta, Andrea Ruju, and Sandro De Muro. 2020. "Natural vs. Anthropic Influence on the Multidecadal Shoreline Changes of Mediterranean Urban Beaches: Lessons from the Gulf of Cagliari (Sardinia)" Water 12, no. 12: 3578. https://doi.org/10.3390/w12123578

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