Nikolaos Nagkoulis

Aristotle University of Thessaloniki | AUTH

Systematic conservation planning (SCP) is essential for meeting global conservation goals and mitigating anthropogenic impacts on biodiversity. Effective conservation planning should incorporate the threedimensional nature of ecosystems, including species distribution by depth. Recent advancements, like the 3D prioritization approach, address this...

Satellite data are extensively used for water quality monitoring purposes, offering a significantly reduced cost compared to in situ data sampling. Using past measurements to predict future conditions remains a challenging task, because of the complexity of the natural phenomena that are involved, with great potential in terms of water resources ma...

COVID-19 pandemic has raised concerns for a number of strategical social interactions. From quarantines and social distancing to vaccination and geopolitics, the cooperation or even the coordination of efforts has been challenging, as governments, economic sector, institutions, and individuals, often have conflicting interests. Game theory, which i...

Rainfall has a dominant role in rainfall-runoff models, with the rendering of these models depending both on the accuracy of the data and on the way that rainfall is spatially allocated. The research proposes a methodological framework where a genetic algorithm (GA)-based method responsible for the spatial distribution of gauge observations at the...

This paper examines the reduction of pump energy consumption at existing water distribution networks through a selective pipes' replacement with new pipes of greater diameter. The selection of diameter is conducted via a Genetic Algorithm which searches for pipes and their diameters that will have the biggest impact in the increase of pressures, on...

Introduction This paper introduces an innovative method to reduce car accidents by employing mechanical concepts and energy conservation to model drivers’ reactions in unexpected scenarios. Methodology The approach involves formulating equations to define drivers’ “internal stress energy,” indicative of their propensity for aggressive driving unde...

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...

In this paper, we examine the accuracy of estimating the hydrogeological parameters, transmissivity (T) and storativity (S), in a confined aquifer, when there are not enough available data for pumping flow rate values. While the most popular methods, used to estimate aquifer characteristics, assume that the pumping flow rate is constant during pump...

In this paper, an integrated methodology is developed to determine optimum areas for Photovoltaic (PV) installations that minimize the relevant visual disturbance and satisfy spatial constraints associated with land use, as well as environmental and techno-economic siting factors. The visual disturbance due to PV installations is quantified by intr...

In this paper, groundwater pumping schedules are examined, in terms of pumping energy consumption minimization. Chromatic graphs are used for the first time to assign groundwater pumping schedules. Assuming that a finite number of users pumps from a common aquifer, we examine the following three pumping scenarios: (a) all users pump simultaneously,...

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...

Το εργαλείο Accu-Waves παρέχει αξιόπιστα δεδομένα σχετικά με την επικρατούσα κατάσταση θαλάσσης τόσο σε πραγματικό χρόνο όσο και σε τριήμερη πρόγνωση ανά 3 ώρες. Τα αποτελέσματα του έργου υποστηρίζουν τις διαδικασίες πλοήγησης σκαφών σε 50 διεθνώς σημαντικούς λιμένες. Το παραχθέν υπολογιστικό προϊόν βασίζεται σε υδροδυναμικά μοντέλα πολύ υψηλής ανά...

In this paper alternate pumping is studied as a means used to reduce the salinity concentration in coastal aquifers, pumped using a system of wells. This approach has been applied to a hypothetical confined coastal aquifer. Flow has been modeled, using SEAWAT. Two strategies are proposed based on cooperative game theory, to promote alternate pumpin...

This paper examines the increase of average pressures at existing water distribution networks through a selective pipes' replacement with new pipes of greater diameter. The selection of diameter is conducted via a Genetic Algorithm which searches for pipes and their diameters that will have the biggest impact in the increase of pressures on conditi...

TIMMOD Research Project presentation in Newsletter#25 of AUTh's Research Committee. Το ερευνητικό έργο TIMMOD χρηματοδοτείται από την ΕΕ μέσω του ΠρογράμματοςBSB 2014-2020 (Προτεραιότητα 2: Προώθηση του συντονισμού της προστασίας τουπεριβάλλοντος και της από κοινού μείωσης απορριμμάτων στη λεκάνη της ΜαύρηςΘάλασσας).Ο γενικός στόχος του έργου είναι...

This paper deals with optimization of extracting groundwater by a number of users (stakeholders) from a common aquifer. The aim is to reduce their pumping cost and the respective energy consumption, taking into account the schedule preferences of the users (e.g. pumping during the day instead of during the night). Moreover, it is postulated that al...

This article investigates the errors occurring when applying the Cooper-Jacob method to calculate the transmissivity (T) and storativity (S), of a confined aquifer, when there is a second pumping well, apart from the one taken into account in the calculations. In our research, field measurements were substituted by synthetic values, produced by an...

In this paper we present the setup, calibration, and validation of an advanced 3-D ocean circulation model to further seek the potential for operational forecasting applications and investigate the coastal hydrodynamic processes in selected areas of the Black Sea. The extents of the studied areas refer to typical mid-range depths in a microtidal op...

Minimization of groundwater exploitation cost is examined, considering: (a) pumping from a system of wells up to a central water tank, including friction losses along the connecting pipe network and (b) amortization of network construction. Assuming that the wells are located symmetrically around the tank and directly connected to it, we derived 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 R package includes the code built using the equations proposed in this paper to solve the second example. The script is uploaded to GitHub and corrected thanks to our dear colleague Aristotelis Dossas. More info can be found using the following link: https://github.com/teldosas/wellsolve The package can be used to find the pumping flow rate a...

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...

In this paper a new method is proposed, using genetic algorithms, to get the Transmissivity (T) and the storativity (S) of a confined aquifer, supposing that a system of wells pumps from the aquifer. Specifically, supposing that the following parameters are available: the hydraulic drawdowns at the location of one piezometer, the daily `volume of w...

This paper deals with water pumping cost minimization, in a confined infinite aquifer, proposing an alternate pulsed pumping schedule. The transient flow analysis is conducted for two wells with equal pumping rates. Specifically, two pumping schedules are analytically compared. In the first case, well users pump simultaneously, and in the second on...

In this paper, we have investigated minimization of total cost to pump a given flow rate from any number (n) of wells up to a water tank, under steady-state flow conditions. Regarding groundwater flow, we have considered infinite or semi-infinite aquifers, to which the method of images applies. Additional regional groundwater flow can be taken into...