Yannis N. Krestenitis

Yannis N. Krestenitis
Aristotle University of Thessaloniki | AUTH · School of Civil Engineering

Ph. D., M.Sc.

About

140
Publications
23,523
Reads
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1,128
Citations
Citations since 2016
44 Research Items
717 Citations
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Introduction
Operational Oceanographic Forecasts in the Thermaikos Gulf: http://wave4us.web.auth.gr/index_eng.html A state-of-the-art forecasting system (WaveForUs: Wave climate and coastal circulation Forecasts for public Use) is implemented that deliver 3-day forecasts of wave, circulation and storm surges for the Thermaikos Gulf.
Additional affiliations
January 1998 - present
Aristotle University of Thessaloniki
Position
  • Managing Director
Description
  • Monitoring and modeling coastal environment (circulation, sediment and pollutants transport), design of coastal structures and sewage outfalls, satellite oceanography and coastal zone management.

Publications

Publications (140)
Article
The development and application of a three-dimensional hydrodynamic and sediment transport model for the Gulf of Thermaikos, in the Northwestern Aegean Sea is presented. The processes that control the transfer of river-borne waters and fine-grained sediments are examined. These processes are: the overall basin circulation, the wind-driven flow, the...
Conference Paper
Full-text available
Coastal erosion is a phenomenon affecting various areas in Greece and during the last years appears especially intense at the northeastern coasts of Rhodos, with significant negative environmental and socioeconomic impacts to the area. In the present work the problem is investigated, analyzing the morphology of the area, the wave regime and the var...
Article
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The research objective is the detection of the mechanism of the water mass exchange through a navigational channel connecting two adjacent coastal basins. The research involves the application of a mathematical model in parallel to in-situ measurements. The hydrodynamic circulation in the greater area of the NW Aegean Sea is modeled by means of a b...
Article
Full-text available
The aim of this work is to develop a computer model capable of simulating the water mass circulation in the Aegean Sea. There is historical, phenomenological and recent experimental evidence of important hydrographical features whose causes have been variably identified as the highly complex bathymetry, the extreme seasonal variations in temperatur...
Article
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The transport of fine-grained sediments in the marine environment entails risks of pollutant intrusions from substances absorbed onto the cohesive flocks' surface, gradually released to the aquatic field. These substances include nutrients such as nitrate, phosphate and silicate compounds from drainage from fertilization of adjacent cultivated...
Article
Full-text available
This study aims to systematically assess the impacts of projected climate change on episodic events of sea level elevation in coastal areas of the Mediterranean, induced by severe weather conditions identified as deep depressions. We try to add new insight in the long-term, climatic timescale, identification of affected parts of the Mediterranean c...
Conference Paper
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This paper presents the application of a numerical model (CoastFLOOD) for the simulation of coastal inundation due to storm surges enhanced by tides. The implementation is based on the output of sea level elevation caused by the combined action of storm surges and astronomical tides from operational forecasts with the High-Resolution Storm Surge (H...
Conference Paper
Full-text available
The interannual and spatial distribution of Marine Heat Waves (MHWs) is investigated based on long-term satellite derived Sea Surface Temperature (SST) data over the NE Mediterranean Sea (Aegean, Ionian, and Cretan Seas) for 14 years (2008-2021). The number of MHWs) showed an increase of approximately 1.7 event and 21 days of MHWs per decade; the s...
Conference Paper
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Medicane Ianos in September 2020 was one the most severe storms that formed over the Mediterranean Sea with Category 2 Hurricane characteristics. Ianos induced high storm surges along its pathway and led to a significant increase of the sea level in the central Ionian Sea, at the Ionian Islands, and along the western Greek coasts. We analyzed the c...
Conference Paper
Full-text available
The hydrodynamic regime of Thermaikos Gulf (NW Aegean Sea) is investigated through a high-resolution 4-year modeling study (2017-2020 period). Validated, state-of-the-art modeling tools are employed to simulate the atmospheric conditions over the study area, the major river discharges, and the resulting circulation of the coastal ocean. Field obser...
Preprint
The IANOS Medicane was one the most severe storms that have formed in the Mediterranean Sea with Category 2 Hurricane characteristics. The storm induced a significant increase of sea level elevation along its pathway and caused the occurrence of storm surges at the central Ionian Sea with consequent impacts on coastal regions of the Ionian islands...
Article
Full-text available
The sea surface temperature (SST) is an important factor and indicator of the sea water quality, with various ecological and anthropogenic implications. We used high-resolution satellitederived SST data, in tandem with field observations and long-term meteorological data, to investigate the spatial and interannual SST variability over the Aegean, I...
Research
Full-text available
CLIMPACT Εθνικό Δίκτυο για την Κλιματική Αλλαγή Newsletter #7 σελ. 34-41 Κλιματική αλλαγή: Μεταβολές στάθμης θάλασσας και παράκτιες πλημμύρες Climate Change: Sea Level Variations and Coastal Floods
Conference Paper
Full-text available
One of the most significant environmental problems of Thermaikos Gulf is the occasional formation of extended eutrophication phenomena (red tides, mucilaginous aggregates). Herein, we investigate the contribution of hydrodynamic processes on the formation of such events, under the effects of different meteorological and river discharge conditions....
Conference Paper
Full-text available
Long-term satellite-derived Sea Surface Temperature (SST) observations (2008-2021) were used to investigate the spatial and temporal interannual variability over the Aegean and Ionian Seas. The number of Marine Heat Waves (MHWs) showed an increase of approximately 1.7 event and 21 days of MHWs per decade; the spatially-and annually-averaged number...
Conference Paper
Full-text available
In this paper, we present the setup, calibration, testing, and application of an advanced 3-D coastal circulation model to investigate the contribution of hydrodynamic processes on the formation of eutrophication events in Thermaikos Gulf, i.e., a typical, river-fed, microtidal, semi-enclosed, coastal inlet of the east-central Mediterranean Sea. Th...
Conference Paper
Full-text available
The Mediterranean region, especially its coastal sites, has been proven in the past to be highly sensitive to Climate Change impacts, experiencing water management problems due to coastal hazards such as inundation by storm surges and sea level rise, land loss, etc. The overarching goal of the present study, being a part of the MEDAQCLIM project, i...
Article
Full-text available
In deltaic areas, riverine and coastal waters interact; hence, these highly dynamic environments are particularly sensitive to climate change. This adds to existing anthropogenic pressures from irrigated agriculture, industrial infrastructure, urbanization, and touristic activities. The paper investigates the estimated future variations in the dyna...
Article
Full-text available
In the present work, a methodological framework, based on nonstationary extreme value analysis of nearshore sea-state parameters, is proposed for the identification of climate change impacts on coastal zone and port defense structures. The applications refer to the estimation of coastal hazards on characteristic Mediterranean microtidal littoral zo...
Article
Thermaikos Gulf is a typical, river-fed, microtidal, semi-enclosed, coastal inlet of the east-central Mediterranean Sea. It is an important coastal ecosystem susceptible to several anthropogenic pressures, strong river discharges and variable meteorological and ocean (met-ocean) conditions. One of the most significant environmental problems of the...
Article
Full-text available
We are living in the ‘plasticene’ era. Marine plastic pollution is a global problem, and increasing effort and funds are being invested towards identifying and implementing solutions. It is well accepted that the implemented solutions should take into account local specificities and culture, which requires the involvement and engagement of local de...
Conference Paper
Full-text available
Global climate change is associated with impacts on the regional regime of sea level variations, i.e. influencing the intensity and frequency of occurrence of extreme storm surges. In the present work, the storm surge patterns in the coastal zone of the Mediterranean Sea are investigated for a period from 1971 to 2100 covering the observed past- an...
Research
Full-text available
Aristotle University of Thessaloniki Special Account of Research Funds' Newsletter #9 (January 2021) about the dissemination of completed Research Projects: MEDAQCLIM
Conference Paper
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In the present integrated monitoring study, the quality of the marine environment of the Thermaic Gulf was appraised by measuring physical, chemical and biological parameters of the seawater and seabed. Water and sediment samples were seasonally collected during sampling campaigns from selected stations located at the inner part of Thermaic Gulf. T...
Conference Paper
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This paper investigates the estimated climate change impacts on the future variations of coastal water inundation dynamics at a characteristic Mediterranean deltaic environment for the 21st century. Output by three Regional Climate Models (RCM) are used with Representative Concentration Pathways (RCP) 4.5 and 8.5, for a short-term (2021-2050) and a...
Article
Full-text available
The availability of environmentally related data is a crucial issue in simulating natural processes. The proposed research demonstrates that although currently there is a plethora of data published on the internet, by national and international official sources, their retrieval is sometimes hard to be achieved; hence smart programming tools/technol...
Article
In this paper we present recent evolvements of three robust numerical models for the simulation of the evolution of wave fields and hydrodynamic circulation in gulfs and coastal areas with large harbours and significant urban port facilities. The models are integrated into a single software suite for the development of a decision support tool to pr...
Conference Paper
Full-text available
Thermaikos Gulf, located in the Northwestern Aegean Sea (Greece), is a marine ecosystem of major importance, not only environmentally (as an area of the deep water formation with contribution to the renewal of the North Aegean deep waters), but also due to the various socioeconomic activities associated with the area. Observational and simulated da...
Conference Paper
Full-text available
Thermaikos Gulf, located in the Northwestern Aegean Sea, is a marine ecosystem of major importance, not only environmentally, but also due to the various socioeconomic activities associated with the area. The present observational study aims to investigate the current (2017-2019) quality state of seawater and seabed in the Gulf. The quality of the...
Conference Paper
Full-text available
Global climate change is closely associated with extreme marine events of higher intensity and frequency, and is generally considered as one of the main causes of nonstationarity in marine signals. In the present work the Generalized Extreme Value (GEV) distribution function is used within a nonstationarity framework to assess extreme storm surges...
Conference Paper
Full-text available
The management of deltaic areas requires a multidisciplinary approach since irrigated agriculture, fish farm industry, touristic activities and environmentally protected areas are conflicted water users. The present study aims at investigating the vulnerability of the water-food-environment nexus in the Mediterranean coastal zone under climate chan...
Conference Paper
Full-text available
The nonstationary univariate extreme value theory is implemented on data of sea state characteristics at selected Greek coastal areas of the Aegean Sea to provide reliable estimates of design total water levels (TWLs) on the coast and to assess their temporal variability in the future climate, by adopting a compound event approach. Long-term time s...
Conference Paper
Full-text available
In this paper we present recent evolvements of a robust numerical model for the simulation of storm surges in gulfs and coastal areas, inside which large harbors and significant urban port facilities exist. HiReSS (High-Resolution Storm Surge) is a 2-DH barotropic model for the simulation of hydrodynamic circulation and sea level variations, based...
Chapter
Full-text available
Results of mathematical modeling for storm surges phenomena in the Eastern Mediterranean and the Black Sea are presented in this paper. A two-dimensional mathematical model was used to simulate changes in sea level due to atmospheric pressure, wind and waves. The model was calibrated using available sea-level measurements from different coastal reg...
Conference Paper
Full-text available
Extreme events of sea level elevation, due to severe weather conditions, pose great threats to low-land coastal areas by extended inundation hazards. The latter take the form of short-to mid-term flooding due to wave-and storm-induced sea level elevation and run-up on the coast. In this paper, the impact of the combined effect of extreme storm surg...
Conference Paper
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Introduction/Aim: Storm surges are caused by severe weather conditions concerning deep low-pressure systems, and are primarily responsible for extended coastal inundation along the Mediterranean and Black Sea coastlines, especially in low-land coastal areas, causing destruction of infrastructure, natural resources and even human casualties. The int...
Conference Paper
Full-text available
Thermaikos Gulf, located in the Northwestern Aegean Sea, is a marine ecosystem of major importance, not only environmentally, but also due to the various socioeconomic activities associated with the area (Krestenitis et al., 2012). The present observational study aims to investigate the quality state of seawater and seabed in the Gulf in summer, au...
Article
Oil spills in the ocean are a matter of concern due to the damaging effect they can have on coastal and offshore resources. This work presents a review of present-day modeling techniques used in the mitigation of oil spills by booms, skimmers, chemical dispersants, and other equipment and the importance of the controlling parameters of these techni...
Article
Full-text available
The outflow of low salinity, eutrophic and cool waters of Black Sea origin (BSW) through the Dardanelles Strait is the strongest buoyant input for the North Aegean Sea. This outflow affects significantly the physical and biological characteristics of the basin, with implications for water mass characteristics and the circulation and biotic producti...
Article
Full-text available
The impact of climate change on the evolution of storm surges in the Aegean and Ionian Seas (AIS) and the Greek coastal zone is studied. The analysis covers the 1951-2100 period (Α1Β climate scenario for the 21 st century), and hinges on simulations with a two-dimensional hydrodynamic model of high spatial resolution (GreCSSM). The comparison of mo...
Chapter
Full-text available
The storm surge, i.e. sea-level elevation due to severe atmospheric conditions (strong winds and low pressures), is a major factor of coastal inundation that can induce significant problems over low-land areas. ‘WaveForUs’ is a high-resolution forecasting system for public and emergency use that delivers meteorological and sea-state predictions ove...
Article
Full-text available
This paper addresses the effects of estimated climate change on the sea-surface dynamics of the Aegean and Ionian Seas (AIS). The main aim is the identification of climate change impacts on the severity and frequency of extreme storm surges and waves in areas of the AIS prone to flooding. An attempt is made to define design levels for future resear...
Conference Paper
Full-text available
The storm surge, i.e. sea-level elevation due to severe atmospheric conditions (strong winds and low pressures), is a major factor of coastal inundation that can induce significant problems over low-land areas. 'WaveForUs' is a high-resolution forecasting system for public and emergency use that delivers meteorological and sea-state predictions ove...
Book
Full-text available
Το βιβλίο απευθύνεται σε Πολιτικούς Μηχανικούς αλλά και Μηχανικούς ή Επιστήμονες άλλων ειδικοτήτων, που βρίσκονται στη φάση των προπτυχιακών ή και μεταπτυχιακών τους σπουδών για θέματα Παράκτιας Μηχανικής και Θαλάσσιας Περιβαλλοντικής Υδραυλικής. Περιλαμβάνει έννοιες της παράκτιας φυσικής ωκεανογραφίας (φυσικές παράμετροι του θαλασσίου νερού, μετρή...
Article
Full-text available
The wave breaking of weak plungers over a relatively mild slope is investigated in this paper. Numerical modeling aspects are studied, concerning the propagation and breaking of shore-normal, nonlinear and regular waves. The two-dimensional (2-D) kinematics and dynamics (fluctuating flow features and large 2-D eddies) of the wave-induced flow on a...
Presentation
Full-text available
Extreme storm surge events pose a great threat to low-elevation coastal areas. We investigate the trends of meteorologically induced extremes of sea level in the Mediterranean Sea, with a specific focus on the Aegean and Ionian Seas, and the Eastern Mediterranean, for a period of 150 years (1951-2100). Analysis is based on hydrodynamic simulations...
Conference Paper
Full-text available
Στην παρούσα εργασία διερευνάται η εξέλιξη των ακραίων τιμών της μεταβολής της θαλάσσιας στάθμης στις παράκτιες ζώνες του Αιγαίου και του Ιονίου Πελάγους. Η ανάλυση καλύπτει μία περίοδο 150 ετών (1951-2100) και στηρίζεται σε προσομοιώσεις με τη χρήση ενός δισδιάστατου υδροδυναμικού μοντέλου (GreCSSM) υψηλής χωρικής ανάλυσης, με βάση το κλιματικό σε...
Conference Paper
Full-text available
The work, analyzed in the present paper, aims at the development of an integrated, state of the art sea-state forecasting system (WaveForUs) for the Thermaikos Gulf. The system provides 3-day forecasts for: (a) wave characteristics, (b) three-dimensional circulation fields and (c) sea level heights using state of the art numerical models. Input atm...
Presentation
Full-text available
A state-of-the-art forecasting system (Wave4Us: Wave climate and coastal circulation Forecasts for public Use) delivers 3-day forecasts of spectral wave characteristics, hydrodynamic circulation and storm surges for the Thermaikos Gulf (North Aegean Sea). The forecasts are disseminated to the public via television broadcasts and internet applicatio...
Conference Paper
Full-text available
Extreme storm surge events pose a great threat to low-elevation coastal areas and can cause loss of land and property, damages to structures and defenses, and even human casualties. Hereby, we explore the trends of meteorologically induced extremes of sea level in the Mediterranean Sea, with a specific focus on the Greek seas, for a period of 150 y...
Conference Paper
Full-text available
The prime goal of the present study is the detailed numerical simulation of surf zone hydrodynamics, due to weakly plunging breakers on a relatively mild impermeable slope. Smoothed Particle Hydrodynamics method is used in combination with a Smagorinsky-type model for the sub-particle scales of the flow, similarly to a Large Eddy Simulations' appro...
Conference Paper
Full-text available
A state-of-the-art forecasting system (WaveForUs: Wave climate and coastal circulation Forecasts for public Use) is implemented, delivering 3-day forecasts of spectral wave characteristics, hydrodynamic circulation and storm surges for the Thermaikos Gulf (North Aegean Sea). The forecasts are disseminated to the public via television broadcasts and...
Article
The last twenty five years multiple management issues concerning the suspended farming of filter feeding bivalves in Greece have emerged from the deficient implementation of different legislation regimes, that, on their own account, have been proven insufficient. Specifically, regarding the planning and management of cultivation areas, multiple alt...
Research
Full-text available
Περιγραφή της διαδικασίας και των χαρακτηριστικών των μαθηματικών ομοιωμάτων πρόγνωσης των μετεωρολογικών και θαλασσίων παραμέτρων (κυματισμός, στάθμη θάλασσας, θαλάσσια κυκλοφορία) του συστήματος WaveForUs
Article
Full-text available
The trends of storm surge extremes in the Mediterranean Sea for a period of 150 years (1951–2100) are explored, using a high-resolution storm surge model. Numerical simulations are forced by the output of regional climate simulations with RegCM3, which uses IPCC’s historical data on greenhouse gasses emissions for the (past) period 1951–2000, and I...
Conference Paper
Full-text available
The present work focuses on the methodology developed for the assessment of short-term forecasts of freshwater fluxes discharging into the Thermaikos Gulf by the main rivers of the area, namely Axios, Loudias and Aliakmon, and the integration of these fluxes in the sea water circulation modelling, as part of the WaveForUs operational forecasting sy...
Conference Paper
Full-text available
Extreme storm surge events pose a great threat to coastal areas and can cause loss of land and property, damages to structures and even human casualties. We explore the trends of sea level over the Greek Seas for a period of 150 years (1951-2100) under the A1B future climate scenario, using a high-resolution storm surge model. Our results suggest t...
Conference Paper
Full-text available
Storm surges are a very important factor of inundation, especially for low-land, bas relief coastal areas, since they contribute significantly to the overall sea surface elevation and the increase of flood risk. The study area of the present paper is the Greek coastal zone. Available Sea Level Height (SLH) timeseries, based on tide gauge records fo...
Poster
Full-text available
WaveForUs is a high-resolution forecasting system for public and emergency use that delivers 3-day sea-state prognoses. In this framework, a prognostic tool for total coastal surges (storm surge, tidal extremes and wave-induced setup) was implemented, aiming at the notification of the authorities and the public in cases of high coastal inundation r...
Poster
Full-text available
Extreme storm surge events pose a great threat to densely populated, low-elevation areas at the coastal zones of the Aegean, Ionian and (northern) Libyan Seas (regional Greek seas of the Mediterranean). Historically, similar events have caused human casualties, damages to coastal structures, and environmental pressures on ecologically sensitive and...
Conference Paper
Full-text available
WaveForUs is a high-resolution forecasting system for public and emergency use that delivers 3-day sea-state prognoses. In this framework, a prognostic tool for total coastal surges (storm surge, tidal extremes and wave-induced setup) was implemented, aiming at the notification of the authorities and the public in cases of high coastal inundation r...