The sedimentological and environmental footprint of extreme wave events in Boca do Rio, Algarve coast, Portugal

Feist, Lisa; Frank, Sebastian; Bellanova, Piero; Laermanns, Hannes; Cämmerer, Christoph; Mathes-Schmidt, Margret; Biermanns, Peter; Brill, Dominik; Costa, Pedro; Teichner, Félix; Brückner, Helmut; Schwarzbauer, Jan; Reicherter, Klaus

doi:10.1016/j.sedgeo.2019.06.004

Cited by 16 publications

(6 citation statements)

References 60 publications

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“…The coast of south-eastern Sicily and the Atlantic side of Portugal are greatly influenced by storm events, medicanes [46,103,104], and hurricanes [32,62,63]. Both areas are characterized by the development of Tropical Like Cyclone for the Tropical transition of an extratropical system.…”

Section: Discussionmentioning

confidence: 99%

“…Hurricanes have increased in frequency and have caused widespread impact along the Portuguese coast and in some of the study areas. For example, Storm Christina in Coxos and Hurricane Leslie in Cova Gala caused extensive inland inundation, sediment erosion and transport, and huge economic damages [61,62]. As with south-eastern Sicily, the central Atlantic coast of Portugal is not an area where Tropical Cyclones form.…”

Section: Geographic Frameworkmentioning

confidence: 99%

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Convolutional Neural Network and Optical Flow for the Assessment of Wave and Tide Parameters from Video Analysis (LEUCOTEA): An Innovative Tool for Coastal Monitoring

Scardino

Scicchitano

Chirivì³

et al. 2022

Remote Sensing

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Coastal monitoring is a topic continuously developing, which has been applied using different approaches to assess the meteo-marine features, for example, to contribute to the development of improved management strategies. Among these different approaches, coastal video monitoring coupled with recent machine learning and computer vision techniques has spread widely to assess the meteo-marine features. Video monitoring allows to obtain large spatially and temporally datasets well-distributed along the coasts. The video records can compile a series of continuous frames where tide phases, wave parameters, and storm features are clearly observable. In this work, we present LEUCOTEA, an innovative system composed of a combined approach between Geophysical surveys, Convolutional Neural Network (CNN), and Optical Flow techniques to assess tide and storm parameters by a video record. Tide phases and storm surge were obtained through CNN classification techniques, while Optical Flow techniques were used to assess the wave flow and wave height impacting the coasts. Neural network predictions were compared with tide gauge records. Furthermore, water levels and wave heights were validated through spatial reference points obtained from pre-event topographic surveys in the proximity of surveillance cameras. This approach improved the calibration between network results and field data. Results were evaluated through a Root Mean Square Error analysis and analyses of the correlation coefficient between results and field data. LEUCOTEA system has been developed in the Mediterranean Sea through the use of video records acquired by surveillance cameras located in the proximity of south-eastern Sicily (Italy) and subsequently applied on the Atlantic coasts of Portugal to test the use of action cameras with the CNN and show the difference in terms of wave settings when compared with the Mediterranean coasts. The application of CNN and Optical Flow techniques could represent an improvement in the application of monitoring techniques in coastal environments, permitting to automatically collect a continuous record of data that are usually not densely distributed or available.

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Section: Discussionmentioning

confidence: 99%

Section: Geographic Frameworkmentioning

confidence: 99%

Convolutional Neural Network and Optical Flow for the Assessment of Wave and Tide Parameters from Video Analysis (LEUCOTEA): An Innovative Tool for Coastal Monitoring

Scardino

Scicchitano

Chirivì³

et al. 2022

Remote Sensing

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“…Most published regional geological tsunami and storm evidence for the pre-instrumental era is restricted to Spain and Portugal (e.g. Dawson et al, 1995;Hindson and Andrade, 1999;Lario et al, 2011;Costa et al, 2011;Feist et al, 2019), but fields of wave-displaced boulders offer records of past storms and/or tsunamis for Morocco (Mhammdi et al, 2008;Medina et al, 2011) that could inform about the regional long-term hazard if robust chronological data were available. The most prominent boulder fields are reported from a 30 km long NE-SW-oriented coastal section between Rabat and Skhirat ( Fig.…”

Section: Exploiting Geological Evidence For Hazard Assessment -The Ramentioning

confidence: 99%

Evaluating optically stimulated luminescence rock surface exposure dating as a novel approach for reconstructing coastal boulder movement on decadal to centennial timescales

et al. 2021

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Abstract. Wave-transported boulders represent important records of storm and tsunami impact over geological timescales. Their use for hazard assessment requires chronological information on their displacement that in many cases cannot be achieved by established dating approaches. To fill this gap, this study investigated, for the first time, the potential of optically stimulated luminescence rock surface exposure dating (OSL-RSED) for estimating cliff-detachment ages of wave-transported coastal boulders. The approach was tested on calcarenite clasts at the Rabat coast, Morocco. Calibration of the OSL-RSED model was based on samples with rock surfaces exposed to sunlight for ∼ 2 years, and OSL exposure ages were evaluated against age control deduced from satellite images. Our results show that the dating precision is limited for all targeted boulders due to the local source rock lithology which has low amounts of quartz and feldspar. The dating accuracy may be affected by erosion rates on boulder surfaces of 0.02–0.18 mm yr−1. Nevertheless, we propose a robust relative chronology for boulders that are not affected by significant post-depositional erosion and that share surface angles of inclination with the calibration samples. The relative chronology indicates that (i) most boulders were detached from the cliff by storm waves; (ii) these storms lifted boulders with masses of up to ∼ 24 t; and (iii) the role of storms in the formation of boulder deposits along the Rabat coast is more significant than previously assumed. Although OSL-RSED cannot provide reliable absolute exposure ages for the coastal boulders in this study, the approach has large potential for boulder deposits composed of rocks with larger amounts of quartz or feldspar and less susceptibility to erosion.

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“…Most published regional geological tsunami and storm evidence for the pre-instrumental era is restricted to Spain and Portugal (e.g. Dawson et al, 1995;Hindson and Andrade, 1999;Lario et al, 2011;Costa et al, 2011;Feist et al, 2019), but fields of wave-emplaced boulders offer records of past storms and/or tsunamis for Morocco (Mhammdi et al, 2008;Medina et al, 2011) that could inform about the regional long-term hazard if robust chronological data were available.…”

Section: Exploiting Geological Evidence For Hazard Assessment -The Rabat Boulder Fieldsmentioning

confidence: 99%

OSL rock surface exposure dating as a novel approach for reconstructing transport histories of coastal boulders over decadal to centennial timescales

Brill

May

Mhammdi

et al. 2020

Preprint

Self Cite

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Abstract. Wave-transported boulders represent important records of storm and tsunami impact over geological timescales. Their use for hazard assessment requires chronological information that in many cases cannot be achieved by established dating approaches. To fill this gap, this study investigated, for the first time, the potential of optically stimulated luminescence rock surface exposure dating (OSL-RSED) for estimating transport ages of wave-emplaced coastal boulders. The approach was applied to calcarenite clasts at the Rabat coast, Morocco. Calibration of the OSL-RSED model was based on samples with rock surfaces exposed to sunlight for ~ 2 years, and OSL exposure ages were evaluated against age control deduced from satellite images. Our results show that the dating precision is limited for all boulders due to the local source rock lithology which has low amounts of quartz and feldspar. The dating accuracy may be affected by erosion rates on boulder surfaces of 0.06–0.2 mm/year. Nevertheless, we propose a robust relative chronology for boulders that are not affected by significant post-depositional erosion and that share surface angles of inclination with the calibration samples. The relative chronology indicates that (i) most boulders were moved by storm waves; (ii) these storms lifted boulders with masses of up to ~ 40 t; and (iii) the role of storms for the formation of boulder deposits along the Rabat coast is much more significant than previously assumed. Although OSL-RSED cannot provide reliable absolute exposure ages for the coastal boulders in this study, the approach has large potential for boulder deposits composed of rocks with larger amounts of quartz or feldspar, older formation histories and less susceptibility to erosion.

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The sedimentological and environmental footprint of extreme wave events in Boca do Rio, Algarve coast, Portugal

Cited by 16 publications

References 60 publications

Convolutional Neural Network and Optical Flow for the Assessment of Wave and Tide Parameters from Video Analysis (LEUCOTEA): An Innovative Tool for Coastal Monitoring

Convolutional Neural Network and Optical Flow for the Assessment of Wave and Tide Parameters from Video Analysis (LEUCOTEA): An Innovative Tool for Coastal Monitoring

Evaluating optically stimulated luminescence rock surface exposure dating as a novel approach for reconstructing coastal boulder movement on decadal to centennial timescales

OSL rock surface exposure dating as a novel approach for reconstructing transport histories of coastal boulders over decadal to centennial timescales

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