Papers by Konstantinos Albanakis
Επιστημονική Επετηρίδα του Τμήματος Γεωλογίας (Α.Π.Θ.), 2010
The chemical composition of Suspended Particulate Matter (SPM) in the northern Thermaikos Gulf wa... more The chemical composition of Suspended Particulate Matter (SPM) in the northern Thermaikos Gulf was studied during a six month experiment, carried out from June 2004 to November 2004. Water samples were collected from three different depths (1 m bellow sea-surface, 10 m depth, 2 m above sea-bottom) and filtered to obtain SPM elemental and Particulate Organic Carbon (POC) concentrations. The geochemical properties of SPM were determined by thin-film X-ray Fluorescence spectrometry. SPM and POC concentrations exhibited strong spatial and temporal variations, related to the different environmental characteristics such as river discharge, wind/wave-induced resuspension of bottom sediment, biological productivity and anthropogenic interference. Correlation analysis showed that the elements Al, Si, Fe, Ti, K, Mg, V and Ba, have terrigenous origin, i.e. detrital aluminosilicates minerals. Chromium, Ni and Co, are of natural origin; they are derived from Axios and Aliakmon watersheds as mafic and ultramafic detrital material. Sulphur, Zn and Cu are derived from partly treated domestic and industrial effluents. The vertical distribution of POC implies higher biological activity at the upper layer of the water column. A part of Ca represents the autocthonous biogenic fraction i.e. biogenic carbonates. Phosphorus is mainly in the form of organic phosphate.
Preliminary report on the suspended sediment load distribution and quality in the river Strymon-lake Kerkini hydrosystem
Bulletin of the Geological Society of Greece, Jul 23, 2018
Γεωμορφολογικές παρατηρήσεις στην ευρύτερη περιοχή του Καβαλλαρίου, βασισμένες σε διαχρονικά ψηφιακά μοντέλα αναγλύφου και εκτεταμένες μετρήσεις GNSS
Οικολογική ποιότητα του Ρήχειου ποταμού και του Ρέματοςτης Απολλωνίας σύμφωνα με την Οδηγία 2000/60/ΕΚ, κατά τις περιόδους Ιουνίου- Οκτωβρίου 2009
Flood risk assessment using remote sensing and geographical information systems (GIS). An example from Kassandra peninsula, Chalkidiki, Greece
Πανελλήνια και Διεθνή Γεωγραφικά Συνέδρια, Συλλογή Πρακτικών, 2015
Floods are natural phenomena and are an integral part of the water cycle. The majority of them ar... more Floods are natural phenomena and are an integral part of the water cycle. The majority of them are the result of climatic conditions, but are also affected by the geology and geomorphology of the area, topography and hydrology, the water permeability of the soil and the vegetation cover, as well as by all kinds of human activities and structures. However, from the moment that human lives are at risk and significant economic impact is recorded, this natural phenomenon becomes a natural disaster. Flood management is now a key issue at regional and local level around the world, affecting human lives and activities. The majority of floods are unlikely to be fully predicted, but it is feasible to reduce their risks through appropriate management plans and constructions. This study was carried out due to the repeated catastrophic floods that have occured in Kassandra peninsula, Halkidiki, Greece and more specifically in the area of Fourka, causing numerous damages. The main purpose of this study is to evaluate the contribution of remote sensing technology and Geographic Information Systems (GIS) in assessing the susceptibility of this region to flood events. Kassandra is facing anthropogenic floods; human intrventions on streams, the beds of which have been trampled to build houses and hotels or have been converted into roads, are causing flooding after every heavy rainfall. The streams crossing settlements and areas with high touristic development have been intensively modified by humans, as the pressure for real estate development land is growing. In particularly, several areas in Kassandra are facing high risk of extensive flood occurrence, since fires happened in the past and flood protection infrastructure has been seriously damaged.. Such examples are the catastrophic fires in August 2006, which destroyed 60 % of the forested area of Kassandra and the dramatic floods that followed in September 2007. This study concentrates on the construction of a flood susceptibility map, of the study area, by combining vulnerability elements, using the Analytical Hierarchy Process/ AHP (Saaty, 1980). After processing of a digital elevation model (DEM), important secondary data were extracted, such as the slope map, the flow direction and the flow accumulation. Together with additional thematic information (e.g. geological maps, land cover etc.), these led to the final four major factors for creating the flood susceptibility map,i.e. the Topographic wetness index, Lithology, Roughness - Land cover and Vegetation cover index (NDVI). These factors were co-evaluated, in order to produce the final map, which categorizes the area into zones of higher to lower flood susceptibility.
Sedimentological and mineralogical study of the distribution of heavy metals in the gulf of Ierissos
Πανελλήνια και Διεθνή Γεωγραφικά Συνέδρια, Συλλογή Πρακτικών, 2015
In the present work, the coastal sediments of the Gulf of Ierissos from the coast to a depth of 1... more In the present work, the coastal sediments of the Gulf of Ierissos from the coast to a depth of 10m are studied. Aim of this study is to determine the positions that are rich in heavy minerals, their identification and study their impact in the sediments of the area. For the purposes of work performed sampling and grain size analysis of the samples. The identified of magnetic separator and method of settling for the separation of heavy minerals from the mineral aggregates were used. The positions deposition of heavy minerals and their concentrations within the coastal sediments of the Gulf of Ierissos were identified. The minerals contained in the sediments were identified. Finally, experiments were conducted to determine the fractions of aggregates sand hydrodynamic equivalent with fractions rich in heavy minerals.
Bulletin of the Geological Society of Greece, Aug 1, 2018
Η τροφοδοσία σε νερό του νέου ταμιευτήρα της Πλατανόβρυσης από το ενδιάμεσο βάθος του ανάντη ταμι... more Η τροφοδοσία σε νερό του νέου ταμιευτήρα της Πλατανόβρυσης από το ενδιάμεσο βάθος του ανάντη ταμιευτήρα του Θησαυρού στον ποταμό Νέστο, ευθύνεται για τη διαμόρφωση ιδιαίτερων λιμνολογικών χαρακτή ρων σ'αυτόν, που δεν συναντώνται σε φυσικές λίμνες, με κυριότερη την θερμοκρασιακή κατανομή. Στο ανάντη αβαθές τμήμα παρατηρείται μετατόπιση των εποχών με ψυχρότερη τη θερινή περίοδο (7°C) και θερμότερη τη φθινοπωρινή περίοδο (15° C). Στο κατάντη βαθύτερο τμήμα δημιουργείται επιλίμνιο με τη μορφή εγκλωβισμέ νης θερμής σφήνας ως αποτέλεσμα της έντονης ροής του ψυχρού υπολίμνιου προς την υπόγεια έξοδο του φράγματος και την κοίτη του Νέστου. Για την αποφυγή περιβαλλοντικών προβλημάτων από τη ροή του ψυχρού νερού στα κατάντη την θερμότερη εποχή του έτους είναι αναγκαία η κατασκευή του αναρυθμιστικού ταμιευτή ρα του Τεμένους στα κατάντη.
Recent changes in sedimentation rates and water residence time in Lysimachia Lake due to anthropogenic influence
Bulletin of the Geological Society of Greece, 1998
Πανελλήνια και Διεθνή Γεωγραφικά Συνέδρια, Συλλογή Πρακτικών, 2010
Πεπίληψη Ζ ππνιεθάλε Λαγθαδά (Κνξώλεηαο) κε ηελ νκώλπκε ιίκλε εληνπίδεηαη πεξίπνπ 15Km ΒΑ ηεο Θεζ... more Πεπίληψη Ζ ππνιεθάλε Λαγθαδά (Κνξώλεηαο) κε ηελ νκώλπκε ιίκλε εληνπίδεηαη πεξίπνπ 15Km ΒΑ ηεο Θεζζαινλίθεο. Ζ άξδεπζε έρεη αλακθηζβήηεηα ηελ κεγαιύηεξε ζπκβνιή ζηελ πνζνηηθή ππνβάζκηζε ηεο ιίκλεο Κνξώλεηαο, κε ηελ ύπαξμε 2.000 θαη πιένλ, λόκηκσλ θαη παξάλνκσλ γεσηξήζεσλ πεξηθεξεηαθά ηεο ιίκλεο. Έλα από ηα πνιιά εξσηήκαηα πνπ εγείξνληαη, είλαη ην εάλ ε αιόγηζηε άληιεζε ησλ πδξνθόξσλ νξηδόλησλ έρεη νδεγήζεη ζε πςνκεηξηθέο κεηαβνιέο (θαζίδεζε) ζηελ πεξηνρή, νη νπνίεο λα έρνπλ απνηππσζεί θαη λα είλαη αληρλεύζηκεο ζε ζεηξέο ςεθηαθώλ πςνκεηξηθώλ δεδνκέλσλ ησλ ηειεπηαίσλ 40 εηώλ. θνπόο ηεο παξνύζαο εξγαζίαο είλαη ε αμηνπνίεζε δηαρξνληθώλ Φεθηαθώλ Μνληέισλ Δδάθνπο (Digital Elevation Models/DEMs) θαη δεδνκέλσλ από ηα Παγθόζκηα Γνξπθνξηθά πζηήκαηα Πινήγεζεο (Global Navigation Satellite Systems/GNSSs) γηα ηνλ εληνπηζκό ελδείμεσλ, νη νπνίεο λα ππνδεηθλύνπλ θαηλόκελα θαζίδεζεο, γηα ηελ πεξίνδν 1970-2010 ζηελ επξύηεξε πεξηνρή Καβαιιαξίνπ-Λαγθαδά, εμαηηίαο ηεο ππεξεθκεηάιιεπζεο ησλ πδξνθόξσλ νξηδόλησλ.
Bulletin of the Geological Society of Greece, Feb 1, 2017
In this article, the author suggests the creation of a protocol for grain size distribution analy... more In this article, the author suggests the creation of a protocol for grain size distribution analysis by pipette method, using specialized software and hardware for minimizing the time needed for analysis. The suggested protocol needs less than 45 minutes for analyzing the size distribution 4Φ to 8Φ sizes since it uses short setting distances, in relation to small pipetting volume, with increased volumetric accuracy and weighting. An Eppendorf Multipette ® Stream, electronic pipette, was used with syringe type tips of 2.5 ml. The tip of this electronic pipette was modified and extended, to create a usable length of 6 cm. Small cylindrical setting tubes, 170 ml, were constructed from transparent Plexiglas, with a special cap on the top, to help smooth insertion of the pipette tip. The electronic pipette was programmed to disperse exactly 2000 μl out of 2500 μl of the total tip. Each 2000 μl pipetting had and accuracy in the order of +/-4 μl. The samples were placed into small metallic containers and placed on top of heating plates with temperature of 65 ο C, for drying. The small volume of the samples accelerates further the whole process. The weighting was performed by an electronic balance with a resolution of 0.1 μl. Using Folk (1980) equation, for setting time calculation and tables for temperature dependence of the setting time, the author created an equation that approximates the settling time for each grain size with temperature. The equation is: = 1500 × (0,0004× + 0,0715× + 1,9826)×. , where t is the time needs a particular diameter d to settle down to a depth h, at temperature T. The equation is valid particle density 2.65 g/cm 3 , at temperature from 16 ο C to 32 ο C with a regression coefficient R 2 = 1.00. The equation was used into a Microsoft EXEL calculation sheet, to calculate automatically the setting times (the time intervals needed to withdraw each size fraction). The samples were withdrawn at different depths, since the tip of the pipette is inserted into the setting cylinder, through a holder and sits on a firm position to minimize disturbance. The whole process and seems to work well and minimizes the time for a whole analysis, needing only the one tenth of the time of the classical pipette method (20 ml pipette, 10 cm withdrawn depths). The new suggested protocol (by the use of Multipette ®), keeps the same concentration per unit volume of sediment in the settling tube and the same concentration of the dispersing factor (calgon). It looks promising especially to sedimentological laboratories that do not have access to expensive automated instrumentation like sedigraph or laser grannulometer.
Bulletin of the Geological Society of Greece, Sep 10, 2005
Thermaikos Gulf receives sediment fluxes from major rivers at its western side, where a thick Hol... more Thermaikos Gulf receives sediment fluxes from major rivers at its western side, where a thick Holocene deltaic sequence has been developed. The eastern site of the gulf is characterized by al ternating erosional and depositional coastlines with the formation of marine terraces and lagoons respectively. Application of the Bruun equilibrium profile model to eastern side of the gulf indicated that the terraces are retreating with high rates of erosion in response to Holocene sea level rise. The mean retreat rate is approximately 0.15 m/y for the last 10000 years, but the recent rate must be lower at about 0.10 m/y. Significant part of the ancient town Aineia, which was build on the eroding terrace, has already been disappeared. The recent low depositional coastlines with lagoons are found in the axis of old valleys, where depositional processes created low morphological profile, which is in equilibrium with the wave processes, according to Bruun model. The recent form of eastern Thermai kos coastline, where the low coastal areas form headlands is the result of faster retreat of coastal terraces, leaving the depositional low coastal regions as promontories. ΠΕΡΙΛΗΨΗ Ο Θερμαϊκός Κόλπος αποτελεί αποδέκτη μεγάλων ποσοτήτων ιζημάτων τα οποία μεταφέρονται από μεγάλα ποτάμια συστήματα που εκβάλλουν στην δυτική πλευρά του κόλπου όπου και έχει σχηματιστεί μια ταχέως προωθούμενη δελταϊκή πεδιάδα με αντίστοιχο μεγάλο πάχος ολοκαινικών προδελτάίκών αποθέσεων. Αντίθετα το ανατολικό τμήμα του κόλπου χαρακτηρίζεται από εναλλαγές διαβρωσιγενών και αποθετικών ακτών με σχηματισμό παράκτιων αναβαθμίδων και χαμηλών ακτών οι οποίες εγκλωβίζουν πίσω τους λιμνοθάλασσες και έλη. Μετά από την εφαρμογή του μοντέλου του Bruun για την ισορροπία του παράκτιου μορφολογικού προφίλ, στις ανατολικές ακτές του Θερμαϊκού φάνηκε ότι οι αναβαθμίδες υποχωρούν με ταχύτατο ρυθμό διάβρωσης ανταποκρινόμενες στην ολοκαινική συνεχή άνοδο της στάθμης της θάλασσας. Ο μέσος ρυθμός διάβρωσης τα τελευταία 10000 χρόνια είναι περίπου 0.15 m/y, αλλά ο πρόσφατος ρυθμός διάβρωσης πρέπει να μικρότερος, περίπου στο 0.10 m/y. Σημαντικό τμήμα της παράκτιας αρχαίας πόλης Αινείας, η οποία βρισκόταν κτισμένη επάνω στην αναβαθμίδα, πρέπει να έχει ήδη εξαφανιστεί. Οι σύγχρονες αποθετικές ακτές με τις λιμνοθάλασσες και τα έλη βρίσκονται σε ισορροπία με το μορφολογικό προφίλ του μοντέλου του Bruun και δεν διαβρώνονται. Οι ακτές αυτές βρίσκονται στους άξονες κοιλάδων και σήμερα προεξέχουν σαν ακρωτήρια γιατί δεν διαβρώνονται αλλά υποχωρούν με πολύ μικρότερο ρυθμό ανταποκρινόμενες στην εκάστοτε άνοδο της μέσης στάθμη της θάλασσας. Η σημερινή μορφή της ακτογραμμής των ανατολικών ακτών του Θερμαϊκού, όπου οι χαμηλές ακτές προεξέχουν σαν ακρωτήρια οφείλεται στην πολύ μεγαλύτερη υποχώρηση, λόγω διάβρωσης, των υψηλών ακτών σε σχέση με τις χαμηλές όπου υπάρχει ισορροπία.
Bulletin of the Geological Society of Greece, Feb 1, 2017
The purpose of this paper is the geomorphological and sedimentological study of modern Nestos Riv... more The purpose of this paper is the geomorphological and sedimentological study of modern Nestos River Delta, to examine the effect of the dams to the sedimentological regime of the coastal zone. Nestos Delta suffered a series of anthropogenic influences; the most significant was the channelization of the river bed, which prevents avulsion and enforces the river to discharge to the sea with one main channel. A DGPS with accuracy better than 1m (GMS-2-Topcon), was used for mapping the coastline, along with sampling the coastal sediments. Sedimentological analysis revealed that the mean size of the sandy material of the coastline reduces with increasing the eastward distance from the river mouth. The western coastline revealed a more complex situation, since it had inherited characteristics from older, abandoned river mouths, bars, spits etc, existed prior to anthropogenic influence. Comparison between the DGPS survey and the 1970 topographic maps revealed some areas with erosional and some with depositional tendencies. A clear erosional tendency was not recorded. Furthermore comparison, between 2000 GPS survey, and the present 2009 DGPS survey, recorded a stability of the coastline within the resolution and the accuracy of the instruments. A possible explanation, is the dramatic reduction of the active area of the delta, due to anthropogenic influence, where at its natural stage, was dispersing sediments with avulsion and multiple river channels in an area of 500 km 2 , but now the active area, where deposition is possible, is only 45.84 km 2 .
Geomorphological research in Samothrace Island
Bulletin of the Geological Society of Greece, 2005
Coastal dynamic processes and human intervention in sandy beach of Pefkochori, Chalkidiki, Greece
Hellenic Journal of Geosciences, 1998
Γεωχημικοί και ισοτοπικοί δείκτες για τον προσδιορισμό της προέλευσης των θερμών ρευστών της Σαντορίνης
Designation of surface water body types according to Water Frame Directive 2000/60 ΕC
Bulletin of the Geological Society of Greece, 2008
Bulletin of the Geological Society of Greece, Feb 1, 2017
This paper deals with the palaeoenvironmental evolution of the Kitros Pierias Lagoon, located at ... more This paper deals with the palaeoenvironmental evolution of the Kitros Pierias Lagoon, located at the west coastline of the Thermaikos Gulf, during the upper Holocene. In addition, the palaeoenvironmental units distinguished in the study area were correlated with the Holocene sea level rise in Thermaikos Gulf. The study is based on the sedimentological and stratigraphical analysis of a core 9.5 m long. Sedimentological and palaeontological analysis was carried out in all selected core samples. The determination of the lithophases and biophases allowed the estimation of the stratigraphycal units, the interpretation of the geomorphological evolution and the characterization of the palaeoenvironmental conditions. According to the results, we can conclude that the area under investigation was a transitional lagoonal environment, semi-enclosed at its initial stage progressively transformed to an isolated sallow basin. The formation of the semi-enclosed lagoon has been commenced after the conclusion of the rapid phase of sea level rise i.e. 6,000 BP years. Finally, the gradual isolation of the lagoon is attributed to low rate of the sea level rise e.g. over the past 4,000 years..
Geomorphological changes in Thessaloniki gulf due to sea level rise the last 10.000 years
The effects of dams on rivers 'continuum
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Papers by Konstantinos Albanakis