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Aristotle University of Thessaloniki (AUTH) 2017

Temporal variability of hydrological parameters and their impact on the reservoirs of groundwater in coastal aquifers

Γαβριηλίδου Ελισάβετ Γαβριήλ

Titre : Temporal variability of hydrological parameters and their impact on the reservoirs of groundwater in coastal aquifers

Διαχρονική μεταβλητότητα των υδρολογικών παραμέτρων και επίπτωση στα αποθέματα υπόγειου νερού σε παράκτιους υδροφορείς

Auteur : Γαβριηλίδου Ελισάβετ Γαβριήλ

Etablissement de soutenance : Aristotle University of Thessaloniki (AUTH)

Grade : Postgraduate "Géologie appliquée et environnementale" (Μaster Τhesis) 2017

Résumé
The aim of this Μaster Τhesis is the long term study of the variability of hydrological parameters and their impacts on groundwater reserves at coastal aquifers, as applied on the coastal part of Sozopolis – N. Flogita. The study area has extends of 98.44 Km2 and is located on the southwestern part of coastal area of western Chalkidiki. It has a population of 7842 citizens. Geologically, it belongs to Paionia zone, and its biggest part is covered by Neogenic and Quaternary sediments. Both surface aquifers, at the coastal part, as well as deeper under pressure layers with changing width, are encountered at the study area, which are hydraulically connected. They recharge either laterally from the karstic aquifer which is formed in the limestone massif of Megali Katsika, but also in positions where sandy clays and conglomerates of low cohesiveness. Hydrochemically there is a qualitatively degradation because of the intensive agricultural activities, which result in high concentrations of nitrate in groundwater. Due to over-pumping the coastal aquifers have been salinized, while in the interior of the study area the geothermal fluids have surfaced and have been mixed with the surface cold aquifers. A decreasing trend in precipitation and real evapotranspiration has been found during the period of 1973 – 2015 according to the meteorological data and hydrological parameters rephrase. From processing results of the hydrological drought index of Palmer and by comparing the periods of 1973-1993 and 1994-2014 it seems that the study area has moved from a mildly wet spell to a mildly dry period respectively. Due to over-pumping, and on a smaller scale of climate change, a clear groundwater level drop has been observed by studying the 1983-2016 period. Lastly, by combining hydrochemical data and from geophysical surveys have been confirmed the phenomenon of seawater intrusion, while the front has been calculated to be as long as 1km from the coastline towards inland.

Mots clés : Groundwater depletion, Seawater intrusion, Chalkidiki, Μείωση αποθεμάτων υπόγειου νερού, Υφαλμύρινση, Χαλκιδική

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Page publiée le 28 février 2021