Global patterns in sandy beach erosion: unraveling the roles of anthropogenic, climatic and morphodynamic factors

Bozzeda, Fabio; Ortega, Leonardo; Costa, Leonardo Lopes; Fanini, Lucia; Barboza, Carlos A. M.; McLachlan, Anton; Defeo, Omar

doi:10.3389/fmars.2023.1270490

Cited by 7 publications

(3 citation statements)

References 92 publications

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“…The intensity and destructiveness of tropical cyclones are expected to increase as the climate warms [109][110][111][112] and this will further accelerate geomorphic and ecologic instability. The combination of faster rates of sea level rise, increasing storminess, and ongoing anthropogenic alterations will surely increase the pace and scale of geomorphic, ecologic, and urban change towards 2050 [113,114]). This will create substantial new challenges to coastal zone practitioners, as the management and planning instruments of governance often lack the capacity to contextualize risk at the pace at which it is changing and the financial resources necessary to implement the plans that have already been accepted [115].…”

Section: Evidence Of Recent Changes and Likely Outcomes Of Faster Rat...mentioning

confidence: 99%

Geomorphic Response of the Georgia Bight Coastal Zone to Accelerating Sea Level Rise, Southeastern USA

Parkinson,

Wdowinski

2023

Coasts

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Synthesis of geologic and chronologic data generated from Holocene sedimentary sequences recovered along the inner continental shelf, shoreface, and modern coastal zone of the Georgia Bight reveal a synchronous sequence of paleoenvironmental events that occurred in response to rate of sea level rise tipping points. During the early Holocene (11.7–8.2 cal kyr BP), the paleoshoreline was overstepped and submerged by rapidly rising seas that averaged ~5 mm yr−1. Rates of rise during the middle Holocene (8.2–4.2 cal kyr BP) averaged ~2 mm yr−1 and this deceleration resulted in the formation of coastal environments and sedimentary sequences that were subsequently reworked as the shoreface continued its landward and upward migration. The modern coastal zone emerged commensurate with the late Holocene (4.2–0 cal kyr BP), when the rate of sea level rise averaged <1 mm yr−1. Analysis of water level data collected at six NOAA tide gauge stations located along the Georgia Bight coast indicates the rate of relative sea level rise has increased from a historical average of 3.6 ± 0.2 mm yr−1 (<1972 to 2022) to 6.6 ± 0.8 (1993 to 2022) and during the 21st century it has averaged 9.8 ± 0.3 mm yr−1 (2003 to 2022). The current rate of sea level rise is nearly double the early Holocene rate of rise. Based upon a novel application of the principle of uniformitarianism (i.e., the past is the key to the future), the likely geomorphic trajectory of the Georgia Bight coastal zone under conditions of 21st century accelerating sea level rise will be one of increasing instability (e.g., coastal erosion) and flooding (e.g., overwash, breaching). Evidence of an emerging instability within the coastal zone has been previously reported throughout the region and supports the trajectory of geomorphic change proposed herein. This will ultimately result in the submergence of existing landscapes and replacement by estuarine and marine environments, which may hasten in pace and scale given the current rate of sea level rise is expected to continue accelerating throughout this century. These findings have not been previously reported and should be considered by coastal practitioners responsible for conceptualizing risk, as well as the formulation and implementation of adaptation action plans designed to mitigate threats to the built and natural environment induced by climate change.

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Section: Evidence Of Recent Changes and Likely Outcomes Of Faster Rat...mentioning

confidence: 99%

Geomorphic Response of the Georgia Bight Coastal Zone to Accelerating Sea Level Rise, Southeastern USA

Parkinson,

Wdowinski

2023

Coasts

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“…As loose sediment accumulations, beaches are fragile and highly dynamic in coastal areas where the atmosphere, hydrosphere and lithosphere interact (Vousdoukas et al, 2020). In past decades, beaches are undergoing rapid changes under threat from the combined effects of natural processes (longshore currents, waves, tidal fluctuations, sediment transport, and surround environment) (Short, 1999;Masselink et al, 2016;Bozzeda et al, 2023), anthropogenic pressure (Mentaschi et al, 2018;Syvitski et al, 2022) and climate change (Ranasinghe, 2016;Almar et al, 2023). Analysis of satellitederived shoreline data indicates that 24% of the world's sandy beaches are eroding at rates exceeding 0.5 m/yr (Luijendijk et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…If the sediment losses exceed the gains within a compartment over a period of time, then the shoreline within that compartment will recede. Various natural and man-induced causes could lead to longterm beach erosion (Dean and Galvin, 1976;Komar, 1998;Woodroffe, 2002;Cai et al, 2009;Van Rijn, 2011;Pranzini et al, 2015;Bozzeda et al, 2023). Beach erosion can be induced by prolonged sea level rise, increased storm frequency and intensity, and increasing frequency of extreme ENSO (El Niño-Southern Oscillation) events as a consequence of global warming (Hinkel et al, 2013;Barnard et al, 2015;Ranasinghe, 2016;Passeri et al, 2018;Vousdoukas et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Decadal evolution of a sandy beach adjacent to a river mouth under natural drivers and human impacts

Liu,

Cai,

et al. 2024

Front. Mar. Sci.

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As escalating environmental pressures threaten the world’s beaches, understanding the driving factors influencing their geomorphological changes is of critical global importance. This study focuses on the morphological changes of Sigeng beach adjacent to Changhua River Mouth in Hainan Island, China through decadal monitoring of shoreline and profile topography and tries to illuminate the natural and anthropogenic factors that drove geomorphological changes. The results showed that Sigeng beach undergone significant changes between 2008 and 2024, with notable accretion at the northernmost and southernmost and general erosion at other sections. The shoreline change rates ranged between -18.4 m/yr and 13.0 m/yr, with the average rate of -1.9 m/yr, indicating overall erosion. The net longshore sediment transport (LST) rates along Sigeng beach was estimated through the combination of the cross-shore (profile) and longshore (shoreline) changes. The overall direction of net LST along the beach were southward, except for the northern section where the direction was northward due to the diffraction of NE waves by the long sand spit at the northernmost. The net LST rates at each profile varied from 0.8×104 m3/yr to 3.5×104 m3/yr. The main factors controlling Sigeng beach evolution, including seasonal wave action and reduction in fluvial sediment load, followed by sand spit and coastal structures, typhoon events, aeolian transport, and sea level rise, were discussed. Subsequently, adaptive protection measures, including beach nourishment, accompanied with groin system or multiple detached breakwaters were proposed to combat with beach erosion. The analysis presented in this study is helpful to understand the morphodynamics and to predict the future change of beaches.

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40-Year Journey of Shoreline Changes Along the Benin Coast Using Satellite Data Through the CASSIE Tool

Bonou,

Madiesseu Metem,

Almeida

et al. 2024

Ocean Sci. J.

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Global patterns in sandy beach erosion: unraveling the roles of anthropogenic, climatic and morphodynamic factors

Cited by 7 publications

References 92 publications

Geomorphic Response of the Georgia Bight Coastal Zone to Accelerating Sea Level Rise, Southeastern USA

Geomorphic Response of the Georgia Bight Coastal Zone to Accelerating Sea Level Rise, Southeastern USA

Decadal evolution of a sandy beach adjacent to a river mouth under natural drivers and human impacts

40-Year Journey of Shoreline Changes Along the Benin Coast Using Satellite Data Through the CASSIE Tool

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