Andreas Papadimitriou

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• Doctor of Engineering
• Research Associate at National Technical University of Athens

Coastal flooding is one of the most threatening and detrimental natural disasters affecting coastal areas (Tsoukala et al., 2016, Chondros et al., 2021a), mainly caused by Sea Level Rise (SLR) due to astronomical tide and storm surge, along with the concurrent wave action. The risk increases further in coastal areas with presence of river or stream...

Boussinesq-type wave models (e.g. Shi et al., 2012) have been traditionally employed to simulate wave agitation in port basins, however they are often associated with significant computational burden. An alluring alternative, with respect to the accuracy and efficiency, concerns models based on the time-depended hyperbolic mild slope wave equation,...

Coastal flooding poses a significant threat to coastal communities, adversely affecting both safety and economic stability. This threat is exacerbated by factors such as sea level rise, rapid urbanization, and inadequate coastal infrastructure, as noted in recent climate change reports. Early warning systems (EWSs) have proven to be effective tools...

Numerical modeling of wave transformation, hydrodynamics, and morphodynamics in coastal regions holds paramount significance for combating coastal erosion by evaluating and optimizing various coastal protection structures. This study aims to present an integration of numerical models to accurately simulate the coastal processes with the presence of...

Ensuring sea surface tranquility within port basins is of paramount importance for safe and efficient port operations and vessels’ accommodation. The present study aims to introduce a robust numerical model based on mild-slope equations, capable of accurately simulating wave disturbance and resonance in ports. The model is further enhanced by the i...

This paper presents a recently developed Operational Forecast Platform (OFP) for prevailing sea conditions at very important ports worldwide (Accu-Waves). The OFP produces reliable high-resolution predictions of wave characteristics in and around ocean ports. Its goal is to support safer navigation, predict possible port downtime, assist vessel app...

Small fishing harbours substantially contribute to coastal economies as they support not only fishing but also tourism activities. They are located at the land–sea interface and are considered vulnerable infrastructure affected by the increased human activities but also by the impacts of climate change, including rising sea levels and extreme weath...

Coastal areas are dynamic multidimensional systems challenged by the complex interactions between natural, environmental, and human-induced pressures, as well as the ever-changing climate. A comprehensive evaluation of their spatial and temporal features enables the development of effective practices required to apply integrated coastal zone manage...

In this paper, a simple approach to determine representative offshore wave characteristics for estimating the annually averaged sedimentation and erosion trends in sandy coastal areas is presented. Given the offshore wave climate, the proposed approach breaks down the climate into fixed 22.5-degree bins and based on the sediment transport potential...

Process-based models have been employed extensively in the last decades for the prediction of coastal bed evolution in the medium term (1–5 years), under the combined action of waves and currents, due to their ability to resolve the dominant coastal processes. Despite their widespread application, they are associated with high demand for computatio...

This paper presents a new Operational Forecast Platform (OFP) for prevailing sea conditions at very important ports worldwide (project Accu-Waves; http://accuwaves.eu/). The OFP produces reliable, high-resolution, predictions of wave characteristics in and around harboured coastal areas. Its goals are to support safer navigation, assist vessel appr...

Integrated Coastal Zone Management (ICZM) policies require a comprehensive evaluation of the complex coastal spatial and temporal characteristics. Stresses induced by natural hazards, human forces and the ever-changing climate are inherently linked with the coastal vulnerability concept that is elaborated through the employment of multi-faceted ICZ...

The morphological coastal bed evolution is of high interest to engineers, scientists and the public due to the vast number of activities concentrated near the shoreline. Traditionally, process-based models have been employed to predict bed level changes in time scales of 1-5 years, however they are associated with prohibitive computational restrict...

Process-based models have been employed extensively in the last decades for the prediction of coastal bed evolution in the medium term (1-5 years), under the combined action of waves and currents, due to their ability to resolve the dominant coastal processes. Despite their widespread application, they are associated with a high demand in computati...

Coastline retreat poses a threat to nearshore environment and the assessment of erosion phenomena is required to plan the coastal engineering works. The hydro-morphodynamic response of a beach to natural and artificial forcing factors differ considerably, as the nearshore processes are especially complex and depended on a multitude of parameters, i...

The simulation of wave propagation and penetration inside ports and coastal areas is of paramount importance to engineers and scientists desiring to obtain an accurate representation of the wave field. However, this is often a rather daunting task due to the complexity of the processes that need to be resolved, as well as the demanding levels of re...

Κλιματική αλλαγή: Μεθοδολογία έγκαιρης πρόβλεψης και προειδοποίησης παράκτιων πλημμυρών.

An integrated methodological approach to the development of a coastal flood early-warning system is presented in this paper to improve societal preparedness for coastal flood events. The approach consists of two frameworks, namely the Hindcast Framework and the Forecast Framework. The aim of the former is to implement a suite of high-credibility nu...

The present paper provides an integrated framework for modelling of coastal inundation, aiming to help coastal communities understand their risks and consequently to prevent the adverse effects to society. The proposed framework involves the implementation and coupling of a suite of sea state hindcast data, numerical wave and hydrodynamic models an...

Forecast of wave agitation inside port basins and consequent downtime of berth positions are of utmost importance to make a port "smarter" by efficiently managing its infrastructure. Within Accu-Waves project (http://accuwaves.eu), a decision-making tool is being developed to provide forecast data on prevailing sea states in the vicinity of port en...

Η παρούσα Τεχνική Έκθεση αποτελεί το παραδοτέο Π3.5, το οποίο περιγράφει αναλυτικά τα ακόλουθα σημεία: • Σύντομη περιγραφή των μοντέλων προσομοίωσης o Υδροδυναμικό Μοντέλο Η (HiReSS) o Κυματικό Μοντέλο Α (TOMAWAC) o Κυματικό Μοντέλο Β (WAVE-L) • Περιγραφή της Μεθοδολογίας Αξιολόγησης o Παράθεση της μεθοδολογικής προσέγγισης o Τυπική διάταξη του Δελ...

Η παρούσα Τεχνική Έκθεση αποτελεί το παραδοτέο Π4.1, το οποίο περιλαμβάνει και περιγράφει αναλυτικά τα ακόλουθα σημεία: • Τεχνικές περιγραφές: o Αρχιτεκτονική Συστήματος - Διάγραμμα Ροής ▪ Επιμέρους υποσυστήματα o Τρόποι Επικοινωνίας Μοντέλων ▪ Διάγραμμα επικοινωνίας ▪ Εκτέλεση μοντέλων o Διαδικασίες εκτέλεσης ▪ Παράλληλη εκτέλεση εργασιών ▪ Κύκλοι...

This paper presents a novel initiative for reliable high-resolution forecasts on prevailing sea states at 50 important ports worldwide (Accu-Waves; http://accuwaves.eu/). Its goal is to support safe navigation, unhampered vessel approaching to busy harbored areas, and secure ship maneuvering in ports. Accu-Waves 1 is based on integrated, high-resol...

The ability to reliably forecast sea states (most importantly sea level, wind, and wave conditions) within or close to the entrance of ports is a critical tool for all involved stakeholders. In this paper, we present our work on a prototype decision support system capable of providing accurate sea state forecasts based on three high-resolution hydr...

The long-term prediction of morphological bed evolution has been of interest to engineers and scientists for many decades. Usually, process-based models are employed to simulate bed-level changes in the scale of years to decades. To compensate for the major computational effort required by these models, various acceleration techniques have been dev...

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...

The present paper aims to incorporate nonlinear amplitude dispersion effects in parabolic and hyperbolic approximation models. First, an explicit and analytical method for considering nonlinearities in parabolic approximation models is investigated. This method follows the concept of calculating spatially and temporally varying wave phase celeritie...

Η παρούσα Τεχνική Έκθεση αποτελεί το παραδοτέο Π2.5, το οποίο περιγράφει αναλυτικά τα ακό-λουθα σημεία: • Τις διενεργηθείσες από την ομάδα έργου μετρήσεις πεδίου • Τις παραμέτρους μέτρησης – παρατήρησης • Τη διενέργεια πλόων και τις σχετικές διοικητικές ενέργειες • Τον εξοπλισμό και τα όργανα μέτρησης: Κυματογράφος – σταθμηγράφος τύπου SBE26 και Aq...

Η παρούσα Τεχνική Έκθεση αποτελεί το παραδοτέο Π2.6, το οποίο περιγράφει αναλυτικά τα ακόλουθα σημεία: • Στοιχεία κωδίκων μοντέλων προσομοίωσης Α, Β, Η • Δεδομένα εισόδου – εξόδου μοντέλων προσομοίωσης Α, Β, Η • Στοιχεία ρύθμισης κώδικα μοντέλων προσομοίωσης Α, Β, Η • Υπολογιστικά πεδία εφαρμογής μοντέλων προσομοίωσης Α, Β, Η • Ειδικές παραμετροποι...

Spectral wave models have experienced constant development and vast improvements over the past decades. They are constantly being extended and refined in order to cover the complex wave transformation processes that take place in the coastal zone. Nevertheless, wave transmission due to overtopping has not been treated similarly yet. In this paper,...

Η παρούσα Τεχνική Έκθεση αποτελεί το παραδοτέο Π1.3, το οποίο περιγράφει αναλυτικά τα ακόλουθα σημεία: Περιγραφή και αλυσίδα εφαρμογής μοντέλων Δεδομένα εισαγωγής στα μοντέλα Μετασχηματισμός και προσαρμογή των ατμοσφαιρικών και θαλασσίων παραμέτρων Καθορισμός οριακών και αρχικών συνθηκών Επιλογή λιμένων και καθορισμός βυθομετρικών και γεωμετρικών χ...

Spectral wave models have experienced constant development and vast improvements over the past decades. They are continuously extended in order to model the complex wave transformation processes that are present in the coastal zone. Nevertheless, wave transmission due to overtopping has not been included properly yet. In the present paper a new met...

The paper presents a decision support tool being developed to provide reliable forecasts on sea states prevailing at selected ports worldwide. The application will support approaching procedures of vessels to ports. It is based on cooperating , hydrodynamic models that derive data from global scale, open sea forecasts. The implementation of the pro...

In this paper we present the evolvement of an integrated numerical model (WAVE-L) for the simulation of wave propagation and transformation in areas around and inside ports and harbors. WAVE-L is a high-resolution phase-resolving wave model based on the hyperbolic mild-slope equations, capable of simulating the transformation of complex wave fields...

The seabed evolution due to wave-current interaction is examined in the case of a gently sloping bottom in a shallow water coastal area. In this study, an attempt has been made to estimate bed level changes over a time period of 96 hours, under accretive and erosive wave sequences. A numerical model based on the non-linear shallow water equations (...