Hydrodynamic, neotectonic and climatic control of the evolution of a barrier beach in the microtidal environment of the NE Ionian Sea (eastern Mediterranean)

Πούλος, Σ.; Ghionis, G.; Verykiou, Efthymia; Roussakis, Grigoris; Sakellariou, D.; Karditsa, Aikaterini; Alexandrakis, George; Petrakis, Stelios; Sifnioti, Dafni; Andris, Periklis; Georgiou, Panos

doi:10.1007/s00367-014-0390-2

Cited by 9 publications

(9 citation statements)

References 44 publications

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“…Poulos et al (2015) found However, if the current shift in severe storm direction from southerly to northwesterly directions continues in the future, regardless of its causes, it constitutes a severe threat not only for the north beaches of the island, but also for the existence of the Lefkada lagoon as it may lead to breaching of the barrier beach.…”

Section: Discussionmentioning

confidence: 99%

“…These profiles were surveyed seasonally (between April 2007 and June 2008), with the use of a NIKON A20 total station, to monitor the topographic changes of the barrier beach (for details see Poulos et al, 2015). The northern part of the barrier beach and the Ag.…”

Section: Methodsmentioning

confidence: 99%

“…This surficial appearance of beachrock on the beach face and the nearshore bottom is evidence that the locally observed shoreline retreat of several metres during the last few decades (Verykiou et al, 2008a) is part of a generalised trend along the northern coastline of Lefkada. The hydrodynamic, neotectonic and climatic controls of the evolution of the Gyra barrier beach are discussed in detail in Poulos et al (2015).…”

Section: Study Areamentioning

confidence: 99%

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The Impact of an Extreme Storm Event on the Barrier Beach of the Lefkada Lagoon, NE Ionian Sea (Greece)

et al. 2015

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The present investigation examines the characteristics of a high energy storm event, that took place on November 9-11, 2007 in the NE Ionian Sea (eastern Mediterranean), and its impact upon the barrier beach that separates the Lefkada lagoon from the open Ionian Sea. The storm event was caused by NW winds with speeds exceeding 20 m/s (40 knots), which have an annual frequency of occurrence less than 0.015%. This high energy event produced waves with >5 m significant offshore height and 9.5 s period; these waves developed on 10 th November during the rapid rise of barometric pressure (~1.4 hPa/hr), which followed the barometric pressure drop from 1020.5 hPa at 06:00 (UTC) of 9 th November to 1001.7 hPa at 06:00 h (UTC) of 10 th November. Secondary breaking at the shoreline produced wave heights >1.5 m, associated with a surge of >0.4 m and a run-up capability of >2.4 m. The waves managed to overtop the barrier beach (elevations ~2.5 m), lowering the seaward side of the barrier beach by 10-30 cm and causing a coastline retreat of 0.9 to 2.2 m; these morphological changes correspond volumetrically to a sediment loss of approximately 8 m 3 /m of coastline length from the sub-aerial part of the beach. During the last three decades a significant change in the frequency of occurrence and direction (from S-SW-W to N-NW-NE) of severe storms with wind speeds exceeding 40 knots has been recorded, affecting the sediment transport pattern and contributing to the erosion of the north beaches of Lefkada.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

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The Impact of an Extreme Storm Event on the Barrier Beach of the Lefkada Lagoon, NE Ionian Sea (Greece)

et al. 2015

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“…The dimensions of the beachrocks range from a few meters to a few kilometers in length, with a width from less than 1 meter to 300-400 m and thickness from 0.3 to 3 m. These formations present flat layers that slope toward the sea, either with the general slope of the beach [31] or with a greater slope than that of the rest of the beach [32][33][34]. Appearances have been reported on many coasts of the world [35][36][37] and in Greece [38,39]. Because they form in the tidal zone, beachrock formations are considered indicators of old coastlines and are often used as a fully accepted and valid method by the scientific community in research to detect sea level changes in earlier periods [36,40,41].…”

Section: Beachrocks and Aeolian Depositsmentioning

confidence: 99%

Integrating Geomorphological Data, Geochronology and Archaeological Evidence for Coastal Landscape Reconstruction, the Case of Ammoudara Beach, Crete

Alexandrakis

Petrakis

Kampanis

2021

Water

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Understanding the processes that govern the transformation of the landscape through time is essential for exploring the evolution of a coastal area. Coastal landscapes are dynamic sites, with their evolution strongly linked with waves and sea level variations. Geomorphological features in the coastal area, such as beachrock formations and dune fields, can function as indicators of the coastal landscape evolution through time. However, our knowledge of the chronological framework of coastal deposits in the Aegean coasts is limited. Optically Stimulated Luminescence dating techniques are deemed to be very promising in direct dating of the coastal sediments, especially when they are linked with archaeological evidence. The dating of the sediments from different sediment core depths, determined by the method of luminosity, allowed us to calculate the rate of sediment deposition over time. More recent coastal evolution and stability were examined from 1945 to 2020 with the use of aerial photographs and satellite images. This paper presents the 6000 ka evolution of a coastal landscape based on geomorphological, archaeological, and radio-chronological data. Based on the results, the early stages of the Ammoudara beach dune field appears to have been formed ~9.0–9.6 ka BP, while the OSL ages from 6 m depth represented the timing of its stabilization (OSL ages ~5–6 ka). This indicates that the dune field appears to already have been formed long before the Bronze Age (5–10 ka BP). It became stabilized with only localized episodes of dune reactivation occurring. In contrast, while high coastal erosion rates were calculated for modern times.

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“…The dimensions of the beach rocks range from a few meters to a few kilometres in length, width from less than one meter to 300-400 m and thickness from 0.3 to 3 m. These formations present flat layers that slope towards the sea, either with the general slope of the beach [46], or with a greater slope than that of the rest of the beach [47][48][49]. Appearances have been reported on many coasts of the world [49][50][51][52], and in Greece [53][54][55]. Beach rocks, due to their ability to form in the tidal zone, are considered indicators of old coastlines and are often used, as a fully accepted and valid method by the scientific community, in research to detect sea level changes in earlier periods [51,[55][56][57][58].…”

Section: Introductionmentioning

confidence: 99%

Integrating Geomorphological Data, Geochronology, and Archaeological Evidence for Coastal Landscape Reconstruction. The Case of Ammoudara Beach, Crete

Alexandrakis¹,

Petrakis²,

Kampanis³

2021

Preprint

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Understanding the processes that govern the transformation of the landscape through time is essential for exploring the evolution of a coastal area. Coastal landscapes are dynamic sites, with their evolution strongly linked with waves and sea-level variations. Geomorphological features in the coastal area, such as beachrock formations and dune fields, can function as indicators of the coastal landscape evolution through time. However, our knowledge of the chronological framework of coastal deposits on the Aegean coasts is limited. Optically stimulated luminescence dating techniques are deemed to be very promising indirect dating of the coastal sediments, especially when they are linked with archaeological evidence. The dating of the sediments from different sediment core depths, as they are determined by the method of luminosity, allows us to calculate the rate of sediment deposition over time. Additionally, the coastal evolution and stability were studied from 1945 until today, with the use of aerial photographs and satellite images. This paper presents the 6000 ka years evolution of a coastal landscape based on geomorphological, archaeological, and radio-chronological data. Based on the results, the early stages of the Ammoudara beach dune field appear to be formed ~9.0 – 9.6 ka BP, while the OSL ages from 6 m depth represented the timing of its stabilization (OSL ages ~5–6 ka). This indicates that the dune field appears to already have been formed long before the Bronze Age (5-10 ka BP) and became stabilized with only localized episodes of dune reactivation occurring, while high coastal erosion rates are found in modern times.

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Hydrodynamic, neotectonic and climatic control of the evolution of a barrier beach in the microtidal environment of the NE Ionian Sea (eastern Mediterranean)

Cited by 9 publications

References 44 publications

The Impact of an Extreme Storm Event on the Barrier Beach of the Lefkada Lagoon, NE Ionian Sea (Greece)

The Impact of an Extreme Storm Event on the Barrier Beach of the Lefkada Lagoon, NE Ionian Sea (Greece)

Integrating Geomorphological Data, Geochronology and Archaeological Evidence for Coastal Landscape Reconstruction, the Case of Ammoudara Beach, Crete

Integrating Geomorphological Data, Geochronology, and Archaeological Evidence for Coastal Landscape Reconstruction. The Case of Ammoudara Beach, Crete

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