Paraskevi Drakopoulou

Hellenic Centre for Marine Research

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Vasilios Kapsimalis

Hellenic Centre for Marine Research

Ioannis Morfis

Hellenic Centre for Marine Research

Ioannis P. Panagiotopoulos

National and Kapodistrian University of Athens

Aristomenis P. Karageorgis

Hellenic Centre for Marine Research

Dimitris Sakellariou

Hellenic Centre for Marine Research

Chara Kyriakidou

Hellenic Centre for Marine Research

ΚP

Κalliopi Pagou

Hellenic Centre for Marine Research

Dimitris Vandarakis

Hellenic Centre for Marine Research

Alexandra Pavlidou

Laboratoire d’Océanographie de Villefranche

Vassiliki Loukaidi

Hellenic Centre for Marine Research

Cooperative Institutions

Hellenic Centre for Marine Research

108

National and Kapodistrian University of Athens

Institute of Oceanography

University of Patras

University of the Aegean

Aristotle University of Thessaloniki

Institute of Geology and Mineral Exploration

National Technical University of Athens

Centre National de la Recherche Scientifique

Technical University of Crete

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The Semi-Enclosed Pagassitikos Gulf Under the Impact of Human Activities

The handbook of environmental chemistry (2024)

D. Kanellopoulos Theodore Petihakis Georgios Pavlidou Alexandra Rousselaki Eleni Hadjianestis Ioannis

10.1007/698_2024_1087

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Citations (0)

Cross-Comparison of the “BathySent” Coastal Bathymetry to Sonar Measurements and Ratio Model Technique: Pilot Sites in the Aegean Sea (Greece)

Water (2023)

Paraskevi Drakopoulou Ioannis P. Panagiotopoulos Marcello de Michele Vasilios Kapsimalis Daniel Raucoules

The proposed novel “BathySent” approach for coastal bathymetric mapping, using the Copernicus Sentinel-2 mission, as well as the assessment and specification of the uncertainties of the derived depth results, are the objectives of this research effort. For this reason, Sentinel-2 bathymetry retrieval results for three different pilot sites in Greece (islands of Kos, Kasos, and Crete) were compared with ground-truth data. These data comprised high-resolution swath bathymetry measurements, single-beam echosounder measurements at very shallow waters (1–10 m), and the EMODnet DTM 2018 release. The synthetic tests showed that the “BathySent” approach could restitute bathymetry in the range of 5–14 m depth, showing a standard deviation of 2 m with respect to the sonar-based bathymetry. In addition, a comparison with the “ratio model” multispectral technique was performed. The absolute differences between conventional Earth Observation-based bathymetry retrieval approaches (i.e., linear ratio model) and the suggested innovative solution, using the Sentinel-2 data, were mainly lower than 2 m. According to the outcome evaluation, both models were considered to provide results that are more reliable within the depth zone of 5–25 m. The “ratio model” technique exhibits a saturation at ~25 m depth and demands ground calibration. Though, the “BathySent” method provides bathymetric data at a lower spatial resolution compared to the “ratio model” technique; however, it does not require in situ calibration and can also perform reliably deeper than 25 m.

Ground truth

Echo sounding

10.3390/w15183168

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Citations (0)

Local seismic array observations at north Evoikos, central Greece, delineate crustal deformation between the North Aegean Trough and Corinthiakos Rift

Tectonophysics (2006)

J. Papoulia J. Makris Paraskevi Drakopoulou

Trough (economics)

Microseism

Stress field

10.1016/j.tecto.2006.03.021

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Citations (13)

Assessment of the Coastal Vulnerability to the Ongoing Sea Level Rise for the Exquisite Rhodes Island (SE Aegean Sea, Greece)

Water (2021)

Dimitris Vandarakis Ioannis P. Panagiotopoulos Vassiliki Loukaidi Georgios-Angelos Hatiris Paraskevi Drakopoulou

The foreseeable acceleration of global sea level rise could potentially pose a major threat to the natural charm and functional integrity of the world-renowned tourist coastal attractions of Rhodes Island, as a result of the anticipated increasing frequency of flooding and erosion events. Hence, this study aims to determine the most vulnerable segments (in terms of physical impact) of the Rhodes coastline through the widely accepted coastal vulnerability index (CVI), applying a combination of well-known, broadly used approaches and methods. The frequency distribution of the current CVI along the island’s coastline suggests a rather worrying high to very high vulnerability of 40%. In addition, a CVI projection to the end of the 21st century (based on the Intergovernmental Panel on Climate Change predictive scenarios) indicates an enhancement of the total vulnerability by 48%, mainly focused on the majority of the western coastline. Hence, a considerable number of popular coastal destinations in the island shall remain under unignorable threat and, therefore, coastal managers and decision-makers need to hatch an integrated plan to minimize economic and natural losses, private property damage and tourism infrastructure deterioration from flooding and erosion episodes, which will most likely be intensified in the future.

Coastal erosion

Vulnerability

Vulnerability index

Coastal flood

10.3390/w13162169

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Citations (16)

Geomorphology, Geological Structure, Active Tectonics, and Basin Formation in the Aegean Sea

The handbook of environmental chemistry (2021)

Dimitris Sakellariou G. Rousakis Paraskevi Drakopoulou Konstantina Tsampouraki-Kraounaki Ioannis Morfis

Seafloor Spreading

10.1007/698_2020_729

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Citations (8)

Using Fishery-Related Data, Scientific Expertise and Machine Learning to Improve Marine Habitat Mapping in Northeastern Mediterranean Waters

Loukas Katikas Sofia Reizopoulou Paraskevi Drakopoulou Vassiliki Vassilopoulou

Marine habitats

10.2139/ssrn.4891055

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Citations (0)

GEOMORPHOLOGY, SEDIMENTOLOGY AND GEOCHEMISTRY IN THE MARINE AREA BETWEEN SIFNOS AND KIMOLOS ISLANDS, GREECE

Bulletin of the Geological Society of Greece (2017)

Aristomenis P. Karageorgis Chr. Ioakim G. Rousakis Dimitris Sakellariou Georgios C. Vougioukalakis

An extensive oceanographic survey was conducted in the marine area between Kimolos and Sifnos Islands, a rather poorly-studied sector of the Aegean Sea, in order to gain better understanding of submarine geomorphological features and associated sediment provenance. Multi-beam bathymetry and surface sediment sampling with a box corer were carried out on board R/V Aegaeo, followed by grain-size analysis, XRD and XRF measurements. A large circular depression was identified north of Kimolos reaching a water depth of 743 m, filled with fine grained sediments. Surface sediment distribution is characterized by gradual decrease in grain-size from silty sand to silt in a S-N direction. The mineralogical composition comprises calcite, Mgcalcite, aragonite, dolomite, quartz, K feldspars, plagioclase, amphiboles and clay minerals. Major sediment provinces identified were: (i) the shallow sector proximal to Kimolos, characterized by higher contents in Si, Al, K, Rb and Ba; (ii) the deep area west of Sifnos, including the large depression, characterized by higher contents in Fe, Ti, Na, Mg, S, Cr, Cu, Ni, V, Zn; and (iii) the south passage between Kimolos and Sifnos, which exhibits higher Ca, S, and Sr contents. Manganese enrichment was observed in and around the bathymetric depression, where Mn oxides act efficiently as scavengers of a suite of metals.

Silt

Coring

10.12681/bgsg.11734

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Citations (3)

Retrieval of nearshore bathymetry in the Gulf of Chania, NW Crete, Greece, from WorldWiew-2 multispectral imagery

Paraskevi Drakopoulou Vasilios Kapsimalis Issaak Parcharidis Kosmas Pavlopoulos

Shallow water bathymetry is recognized as one of the most fundamental topics in environmental studies, seabed morphology research and management of the coastal zone. The detailed mapping as well as the long-term monitoring of the changes in shallow marine relief is important for the successful completion of coastal construction and environmental projects. In recent years, optical satellite imagery is proving to be a useful tool to determine coastal bathymetry, as it provides a time- and cost- effective solution to water depths estimation. In this paper, the two most popular and successful approaches for bathymetry retrieval, the Lyzenga (1985) linear bathymetry model and the Stumpf et al. (2003) ratio method, have been applied to Worldview-2 satellite imagery, in order to derive the more accurate bathymetric model for the shallow-water region of the Chania Gulf, located in NW Crete Island, Greece. This area is sea-grass free and is dominated by sandy substrate with a few rocky outcrops. The models are implemented over the total study area - no separation in subareas according to the bottom type. The results are compared with echo sounding ground truth depth data. The outcomes of the statistical analysis indicate that the linear model provides increased accuracy than the ratio one over the sandy bottom. On the contrary, in those parts covered by rocky bottoms, none of the two models provided satisfactory results.

Echo sounding

Seabed

Ground truth

10.1117/12.2326189

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Citations (4)

Seagrass meadows in the Greek Seas: presence, abundance and spatial distribution

Botanica Marina (2022)

Panayotidis Panayiotis Vasillis Papathanasiou Vasileios Gerakaris Elias Fakiris Sotiris Orfanidis

Abstract Combined use of optical (satellite imagery) and acoustic (sidescan sonar) remote sensing techniques, as well as in situ methodologies (visual census; SCUBA diving, Towed Underwater Cameras, and Remotely Operated Vehicles) was employed to map the spatial distribution of seagrass habitats in the coastal waters of the Greek territory. Seagrass meadows were recorded over approximately 70% of the Greek coastline (Eastern Ionian, Aegean and Levantine Seas), and their surface area exceeded 2749.07 km 2 . Posidonia oceanica is clearly the dominant seagrass species in Greek Seas, covering the vast majority of seabed at depths between the shoreline and 25–30 m (or deeper in insular areas), followed by the species Cymodocea nodosa , Zostera noltei , and Halophila stipulacea , that are not widely distributed but are locally abundant in specific areas. Habitat suitability in terms of the of the seabed that is available for the growth of seagrass meadows (i.e., the spatial extent of coastal areas between the shoreline and the isobath of 20 m) and the seawater clarity conditions are highlighted as the critical factors for the formation of well-structured and extensive meadows. The results of this study are of great importance and usefulness for the effective management and conservation of valuable marine ecosystems and are given in the form of an openly accessible shapefile.

Posidonia oceanica

Zostera marina

Scuba diving

Marine ecosystem

10.1515/bot-2022-0011

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Citations (14)

Effects of olive oil wastes on river basins and an oligotrophic coastal marine ecosystem: A case study in Greece

The Science of The Total Environment (2014)

Alexandra Pavlidou E. Anastasopoulou Manos Dassenakis Ioannis Hatzianestis Vasiliki Paraskevopoulou

Marine ecosystem

10.1016/j.scitotenv.2014.07.088

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Citations (33)