N. Lambrakis | University of Patras (original) (raw)

Papers by N. Lambrakis

Bulletin of the Geological Society of Greece, 2004

The aim of this study is to evaluate the potential of Therma Nigrita low-enthalpy geothermal fiel... more The aim of this study is to evaluate the potential of Therma Nigrita low-enthalpy geothermal field and to examine the possibility of exploitation. Six geothermal fluid samples and two cold-water samples were obtained from eight boreholes situated in the Therma field of Nigrita. Field measurements, as well as laboratory determinations using classic and modern methods of analyses were carried out. The temperature of the geothermal fluids ranges from 38,5 up to 62,5°C; the discharge rates of the boreholes range from 40 up to 70 m3/h. These data lead to the conclusion that the field is exploitable. Due to high As and Li contents and in order to avoid environmental impacts, it is essential to reinject the waste geothermal fluids into the geothermal reservoir. For the exploitation of the geothermal field, the applications of district heating and cooling of a part of Nigrita Municipality using heat pumps, in combination with greenhouse applications, are proposed. In order to save energy an...

Bulletin of the Geological Society of Greece, 2004

The lower Pinios basin at the eastern coast of the Peloponnesus, hosts a system of alternative aq... more The lower Pinios basin at the eastern coast of the Peloponnesus, hosts a system of alternative aquifers in the Pleistocene sediments of "Kalatha" formation. The elaboration of chemical analyses of the principal and trace elements of groundwater samples shown that a Redox environments and the presence of deep thermal water affect the groundwater quality. The aquifers sectors with reducing conditions are characterized by high concentrations of alkalinity, ammonia, total iron and total manganese groundwater. In the aquifers sectors with oxidizing conditions the values of the above parameters are low and the dominance of the chemical elements oxidizing forms are obvious.

Bulletin of the Geological Society of Greece, 2004

The aquifers of the Messini region were categorized on the basis of lithology of different geolog... more The aquifers of the Messini region were categorized on the basis of lithology of different geological formations and are presented in this study. They are classified in two main categories: the porous media aquifers, in which are included the alluvial deposits and the Pleio-pleistocene formations, and the karst aquifers of carbonate rocks. Based on field and laboratorial chemical analyses, a relatively increased salinity of the karst aquifer was confirmed and is attributed to natural mixing mechanisms between fresh and seawater. Also, high concentrations of nitrates and nitrites were determined in the groundwater of the Pleiopleistocene aquifer, as a consequence of intensive fertilization with ammonium and sulfate fertilizers.

The Muğla Basin is one of the most well-documented coal basins of Anatolia, SW Turkey. Previous s... more The Muğla Basin is one of the most well-documented coal basins of Anatolia, SW Turkey. Previous studies mainly focused on coal geology, as well as on the environmental impacts from trace elements emitted into the atmosphere during coal combustion. However, the environmental impacts from coal utilization also include groundwater contamination from hazardous trace elements leached from exposed lignite stockpiles or ash disposal dumps. In the present study a comparative assessment of the combustion, as well as the leaching behaviour of trace elements from sixteen lignite, fly ash and bottom ash samples under various pH conditions is attempted. The samples were picked up from three regions in the Muğla Basin, namely, these of Yeniköy, Kemerköy and Yatağan. Proximate and ultimate analyses were performed on all samples. Quantitative mineralogical analysis was carried out using a Rietveld-based full pattern fitting technique. The elements Ag, As, B, Ba, Be, Co, Cr, Cu, Fe, Ga, Hf, Li, Mn, ...

Geothermal Systems and Energy Resources, 2014

Hydrogeology Journal, 2014

The implementation of a geographic information system (GIS)/fuzzy spatial decision support system... more The implementation of a geographic information system (GIS)/fuzzy spatial decision support system in the selection of sites for drinking-water pumping boreholes is described. Groundwater is the main source of domestic supply and irrigation in Korinthia prefecture, southeastern Greece. Water demand has increased considerably over the last 30 years and is mainly met by groundwater abstracted via numerous wells and boreholes. The definition of the most "suitable" site for the drilling of new boreholes is a major issue in this area. A method of allocating suitable locations has been developed based on multicriteria analysis and fuzzy logic. Twelve parameters were finally involved in the model, prearranged into three categories: borehole yield, groundwater quality, and economic and technical constraints. GIS was used to create a classification map of the research area, based on the suitability of each point for the placement of new borehole fields. The coastal part of the study area is completely unsuitable, whereas high values of suitability are recorded in the southwestern part. The study demonstrated that the method of multicriteria analysis in combination with fuzzy logic is a useful tool for selecting the best sites for new borehole drilling on a regional scale. The results could be used by local authorities and decision-makers for integrated groundwater resources management.

Journal of Hydrology, 2006

Seawater intrusion in porous media and accompanying transport processes were investigated. The pr... more Seawater intrusion in porous media and accompanying transport processes were investigated. The present study concerns the coastal area of the Thrace region, Greece that is a typical Mediterranean coastal aquifer system. This aquifer system consists of several highly permeable zones separated by less-permeable layers. The aquifer system is hydraulically interconnected in variable ways. The intensive pumping together with the absence of any integrated water resources management plan, resulted in the permanent presence of a reverse regional cone of depression and the degradation of the groundwater quality. The decline in water level reached K40 m in the centre of the study area. Hydrochemical diagrams and ion balance demonstrated that cation exchange phenomena take place due to salinization processes in the coastal zone and refreshening processes in recharge areas. In these areas, groundwater is locally characterized by increased salinity, which may be partly connate in origin. The code PHREEQC, which is suitable for transport modeling, successfully simulated the extent of the saline front from Vistonis Lagoon to approximately 6 km inland. The application of the code proved that the aquifer system has properties of a dual porosity medium, where exchanges of chemical species take place between flowing and stagnant water through the process of diffusion. The current chemical characteristics of the groundwater under the simulated conditions were achieved when the amount of groundwater equals 1.7 times the pore water volume of the aquifer system.

Hydrogeology Journal, 2004

A large number of chemical analyses of Greek thermal waters were evaluated in order to investigat... more A large number of chemical analyses of Greek thermal waters were evaluated in order to investigate spring water origin, water-rock interaction mechanisms, and estimate the thermal potential of the geothermal areas. Four water types were distinguished from geochemical diagrams. The relatively fresher waters include samples of Ca-HCO 3 and Mg-HCO 3 type waters originating from the schistose Rhodope Massif and the Quaternary basin of Aridea, respectively. Samples of the Na-HCO3 water type are typical of springs located in the post-orogenic basins of northern Greece. These hot, deep-rising Na-HCO 3 waters circulate in a CO 2-rich environment that favours the solubility of alkaline ions such as Na from siliceous rocks. Most of the samples belong to the Na-Cl water type and originate from Greek islands and coastal springs. These are characterized by the mixing of deep thermal solutions with seawater and fresh water. The presence of CO 2 in thermal and mineral springs is due to the metamorphism of buried marine carbonate horizons while H 2 S is due to both local pyrite oxidation and the reduction of sulphates. The use of geothermometers suggested that the investigated geothermal areas have low enthalpy fluids at depth, while higher temperatures are likely present in Milos, Lesvos, Nisyros islands and Xanthi Basin.

Hydrogeology Journal, 2017

Karst aquifers are very complex due to the presence of dual porosity. Rain-runoff hydrological mo... more Karst aquifers are very complex due to the presence of dual porosity. Rain-runoff hydrological models are frequently used to characterize these aquifers and assist in their management. The calibration of such models requires knowledge of many parameters, whose quality can be directly related to the quality of the simulation results. The Sacramento Soil Moisture Accounting (SAC-SMA) model includes a number of physically based parameters that permit accurate simulations and predictions of the rain-runoff relationships. Due to common physical characteristics of mature karst structures, expressed by sharp recession limbs of the runoff hydrographs, the calibration of the model becomes relatively simple, and the values of the parameters range within narrow bands. The most sensitive parameters are those related to groundwater storage regulated by the zone of the epikarst. The SAC-SMA model was calibrated for data from the mountainous part of the Louros basin, northwestern Greece, which is considered to be representative of such geological formations. Visual assessment of the hydrographs as statistical outcomes revealed that the SAC-SMA model simulated the timing and magnitude of the peak flow and the shape of recession curves well.

The Muğla Basin is one of the most well-documented coal basins of Anatolia, SW Turkey. Previous s... more The Muğla Basin is one of the most well-documented coal basins of Anatolia, SW Turkey. Previous studies mainly focused on coal geology, as well as on the environmental impacts from trace elements emitted into the atmosphere during coal combustion. However, the environmental impacts from coal utilization also include groundwater contamination from hazardous trace elements leached from exposed lignite stockpiles or ash disposal dumps. In the present study a comparative assessment of the combustion, as well as the leaching behaviour of trace elements from sixteen lignite, fly ash and bottom ash samples under various pH conditions is attempted. The samples were picked up from three regions in the Muğla Basin, namely, these of Yeniköy, Kemerköy and Yatağan. Proximate and ultimate analyses were performed on all samples. Quantitative mineralogical analysis was carried out using a Rietveld-based full pattern fitting technique. The elements Ag, As, B, Ba, Be, Co, Cr, Cu, Fe, Ga, Hf, Li, Mn, ...

Environmental Earth Sciences, 2019

Neogene formations display complex structure, and host confined aquifers that are alternated, and... more Neogene formations display complex structure, and host confined aquifers that are alternated, and very often interrupted by impermeable clay layers. In many cases, the lack of hydrogeological information and data on those aquifers hinders research and planning of exploitation projects. This study attempts to exploit the available information that can be derived from a sampling, and the corresponding chemical analyses, to reconstruct the hydrogeological image of such areas. Thus, the chemical composition is used as a tool for natural tracing of the groundwater origin and movement in a previously unknown environment such as that of Ilia region, which was selected as the application area. The distribution maps of certain hydrochemical parameters, combined with the appropriate hydrochemical and isotopic data, contributed to the classification of the groundwater samples by linking the hydrochemical processes with the samples' locations as well as the origin of the aquifers' recharge water. At the same time, the effectiveness of the used methodology was evaluated. The use of R-mode factor analysis led to the determination of the basic hydrochemical processes that shape the groundwater quality. The analysis showed that the reducing environment is the defining factor that regulates the presence of the various chemical compounds. Finally, the conceptual model of the aquifers emerged from the analysis of all the data. This analysis also pointed out that the recharge of the local aquifers takes place mainly through the river beds and laterally from their contact with the carbonate rocks.

Bulletin of the Geological Society of Greece, 2007

Farsala Basin presents a remarkable geothermal interest. Areas exhibiting geothermal potential ar... more Farsala Basin presents a remarkable geothermal interest. Areas exhibiting geothermal potential are directly related to faulted zones, represented mainly by cross-faulted systems of E-W, NW-SE and NNE-SSW direction. Thermal waters occur in the areas of Ampelia and Krini in boreholes of 420 m depth. Their temperature ranges between 20,5° and 39,1° C. Thermal waters originate from meteoric waters, which have been infiltrated and heated in great depths, moved towards the surface through faults and hosted in the aquifers of coarse - grained formations find in the area. Their chemical composition is controlled by their contact with the volcanic parts (pillow lavas) of the ophiolithic series. They show alkaline character and low salts concentration. Waters of Ampelia region, which belong to Na-HCO^ type, exhibit temperatures from 27,9° to 39,1° C and low salt concentrations (405- 607 mg/l TDS). On the contrary, waters of Krini area present lower temperatures (20,5° -26,2° C) and higher sal...

Journal of Environmental Radioactivity, 2018

Results of measurements of radon around of the Black Sea are shown. Radon stations in zones of ac... more Results of measurements of radon around of the Black Sea are shown. Radon stations in zones of active faults were placed. Simultaneous hourly measurements of soil radon in 2005 were carried out in the Sivrice Fault Zone that is a segment of East Anatolian Fault System, in the town of Tbilisi (Georgia) and in the South Russia. In 2008 simultaneously hourly measurements of soil radon were carried out in the Western Caucasus (Russia) and in the Mytilene Island (Greece). In 2013 radon in underground waters simultaneously in midday was measuring in Crete (Greece), in the Pamukkale geothermal region (Southwest Turkey) and in the Western Caucasus. Measurements of radon concentration in the points located around of the Black Sea have shown identical regularities in changes of the data. Influence of meteorological, tidal and solar factors on changes of water radon concentrations and soil radon concentrations was observed in all researches points. But this influence was insignificant. Seismological application of observed results also was considered. Various mathematical methods of definition of anomaly in the radon data during earthquakes were considered. During researches in the Black Sea region basically earthquakes with M from 2.0 up to 5.0 and in a depth about 10 km were occurred. For these earthquakes method of daily subtraction of the data of the next and previous day was used. This method has allowed solving a problem with a choice of average value. Probability up to 0.69 (number of earthquakes with radon anomalies/total number of earthquakes) of detection of radon anomalies before earthquakes was achieved applying this method. Changes of radon maps before regional earthquakes were also observed. The frequency analysis of variations of the radon data on the basis of the Wavelet analysis was carried out. Occurrence of the short periods (about 2 days) was observed during regional earthquakes. the Russian Academy of Sciences (GS RAS)). One feature of the Black Sea is the extraordinarily extensive presence of gas emissions from rocks in waters of the Black Sea (Esipovich, 2003). Gas emissions have been observed from the coast of Turkey up to the coast of Georgia in the east and up to the Bulgarian shelf in the west. Gas streams of methane in seawater are connected with mud volcanoes of the Kerch-Taman province and with faults. Therefore, measurements of underground gas concentrations are very important for tectonic and seismological studies. In previous seismological studies performed in

Food and Environmental Virology, 2019

The purpose of this study is to assess the overall impact of different anthropogenic activities i... more The purpose of this study is to assess the overall impact of different anthropogenic activities in the Vouraikos River basin (southwestern Greece, Natura 2000 area). Virological quality of river water samples was investigated. Positive samples for human adenoviruses were found occasionally, while porcine adenoviruses and bovine polyoma viruses were not detected. It is the first time that virological data are collected in the study area.

Bulletin of the Geological Society of Greece, 2017

In the present study the relationship between Rn and hydrochemical parameters in groundwater samp... more In the present study the relationship between Rn and hydrochemical parameters in groundwater samples with the intense tectonics that prevail in the broader region of Aigion were investigated. Radon concentrations were measured in water samples collected from the unconfined aquifer, hosted in Plio-Pleistocene deposits, along the major faults of the research area. The spatial distribution of radon concentrations revealed the existence of three distinct zones along Aigion, Pyrgaki and Helike faults, respectively. The first two zones are characterized by high radon concentrations, whereas the third by low radon concentrations. It is also shown that 222Rn and CO2 concentrations display similar spatial distribution suggesting a common origin for these two gases, with CO2 being the major carrier gas for radon in deep fluids. The deformation and fragmentation of rocks along the fault zones enables the circulation of those fluids resulting in elevated radon concentrations in groundwater. How...

Bulletin of the Geological Society of Greece, 2017

The Muğla Basin is one of the most well-documented coal basins of Anatolia, SW Turkey. Previous s... more The Muğla Basin is one of the most well-documented coal basins of Anatolia, SW Turkey. Previous studies mainly focused on coal geology, as well as on the environmental impacts from trace elements emitted into the atmosphere during coal combustion. However, the environmental impacts from coal utilization also include groundwater contamination from hazardous trace elements leached from exposed lignite stockpiles or ash disposal dumps. In the present study a comparative assessment of the combustion, as well as the leaching behaviour of trace elements from sixteen lignite, fly ash and bottom ash samples under various pH conditions is attempted. The samples were picked up from three regions in the Muğla Basin, namely, these of Yeniköy, Kemerköy and Yatağan. Proximate and ultimate analyses were performed on all samples. Quantitative mineralogical analysis was carried out using a Rietveld-based full pattern fitting technique. The elements Ag, As, B, Ba, Be, Co, Cr, Cu, Fe, Ga, Hf, Li, Mn, ...

Bulletin of the Geological Society of Greece, 2017

The objective of this paper is to study the impact of a reflooding of the former Mouria Lake on t... more The objective of this paper is to study the impact of a reflooding of the former Mouria Lake on the hydraulic state of the Pyrgos area. The hydrogeological data acquired through field work were combined with the volumetric budget and the hydrological data from the entire Alfios River catchment in order to build the conceptual and numerical model of the groundwater flow system, which confirmed the hydraulic state before the drainage of the Mouria Lake. The model was also used to predict the future hydraulic state in case stresses change. For this purpose, Flowpath II, a numerical groundwater flow model, was used to evaluate the impacts of groundwater exploitation in the alluvium unconfined aquifer that is developing in the Holocene deposits. Due to the connection of the aquifer with the surface drainage canals near the coastal zone, the conceptual model was built upon irrigation data, rainfall data, and pumping rate data from the pumping stations that drain the area of the former Mou...

Bulletin of the Geological Society of Greece, 2004

The aim of this study is to evaluate the potential of Therma Nigrita low-enthalpy geothermal fiel... more The aim of this study is to evaluate the potential of Therma Nigrita low-enthalpy geothermal field and to examine the possibility of exploitation. Six geothermal fluid samples and two cold-water samples were obtained from eight boreholes situated in the Therma field of Nigrita. Field measurements, as well as laboratory determinations using classic and modern methods of analyses were carried out. The temperature of the geothermal fluids ranges from 38,5 up to 62,5°C; the discharge rates of the boreholes range from 40 up to 70 m3/h. These data lead to the conclusion that the field is exploitable. Due to high As and Li contents and in order to avoid environmental impacts, it is essential to reinject the waste geothermal fluids into the geothermal reservoir. For the exploitation of the geothermal field, the applications of district heating and cooling of a part of Nigrita Municipality using heat pumps, in combination with greenhouse applications, are proposed. In order to save energy an...

Bulletin of the Geological Society of Greece, 2004

The lower Pinios basin at the eastern coast of the Peloponnesus, hosts a system of alternative aq... more The lower Pinios basin at the eastern coast of the Peloponnesus, hosts a system of alternative aquifers in the Pleistocene sediments of "Kalatha" formation. The elaboration of chemical analyses of the principal and trace elements of groundwater samples shown that a Redox environments and the presence of deep thermal water affect the groundwater quality. The aquifers sectors with reducing conditions are characterized by high concentrations of alkalinity, ammonia, total iron and total manganese groundwater. In the aquifers sectors with oxidizing conditions the values of the above parameters are low and the dominance of the chemical elements oxidizing forms are obvious.

Bulletin of the Geological Society of Greece, 2004

The aquifers of the Messini region were categorized on the basis of lithology of different geolog... more The aquifers of the Messini region were categorized on the basis of lithology of different geological formations and are presented in this study. They are classified in two main categories: the porous media aquifers, in which are included the alluvial deposits and the Pleio-pleistocene formations, and the karst aquifers of carbonate rocks. Based on field and laboratorial chemical analyses, a relatively increased salinity of the karst aquifer was confirmed and is attributed to natural mixing mechanisms between fresh and seawater. Also, high concentrations of nitrates and nitrites were determined in the groundwater of the Pleiopleistocene aquifer, as a consequence of intensive fertilization with ammonium and sulfate fertilizers.

The Muğla Basin is one of the most well-documented coal basins of Anatolia, SW Turkey. Previous s... more The Muğla Basin is one of the most well-documented coal basins of Anatolia, SW Turkey. Previous studies mainly focused on coal geology, as well as on the environmental impacts from trace elements emitted into the atmosphere during coal combustion. However, the environmental impacts from coal utilization also include groundwater contamination from hazardous trace elements leached from exposed lignite stockpiles or ash disposal dumps. In the present study a comparative assessment of the combustion, as well as the leaching behaviour of trace elements from sixteen lignite, fly ash and bottom ash samples under various pH conditions is attempted. The samples were picked up from three regions in the Muğla Basin, namely, these of Yeniköy, Kemerköy and Yatağan. Proximate and ultimate analyses were performed on all samples. Quantitative mineralogical analysis was carried out using a Rietveld-based full pattern fitting technique. The elements Ag, As, B, Ba, Be, Co, Cr, Cu, Fe, Ga, Hf, Li, Mn, ...

Geothermal Systems and Energy Resources, 2014

Hydrogeology Journal, 2014

The implementation of a geographic information system (GIS)/fuzzy spatial decision support system... more The implementation of a geographic information system (GIS)/fuzzy spatial decision support system in the selection of sites for drinking-water pumping boreholes is described. Groundwater is the main source of domestic supply and irrigation in Korinthia prefecture, southeastern Greece. Water demand has increased considerably over the last 30 years and is mainly met by groundwater abstracted via numerous wells and boreholes. The definition of the most "suitable" site for the drilling of new boreholes is a major issue in this area. A method of allocating suitable locations has been developed based on multicriteria analysis and fuzzy logic. Twelve parameters were finally involved in the model, prearranged into three categories: borehole yield, groundwater quality, and economic and technical constraints. GIS was used to create a classification map of the research area, based on the suitability of each point for the placement of new borehole fields. The coastal part of the study area is completely unsuitable, whereas high values of suitability are recorded in the southwestern part. The study demonstrated that the method of multicriteria analysis in combination with fuzzy logic is a useful tool for selecting the best sites for new borehole drilling on a regional scale. The results could be used by local authorities and decision-makers for integrated groundwater resources management.

Journal of Hydrology, 2006

Seawater intrusion in porous media and accompanying transport processes were investigated. The pr... more Seawater intrusion in porous media and accompanying transport processes were investigated. The present study concerns the coastal area of the Thrace region, Greece that is a typical Mediterranean coastal aquifer system. This aquifer system consists of several highly permeable zones separated by less-permeable layers. The aquifer system is hydraulically interconnected in variable ways. The intensive pumping together with the absence of any integrated water resources management plan, resulted in the permanent presence of a reverse regional cone of depression and the degradation of the groundwater quality. The decline in water level reached K40 m in the centre of the study area. Hydrochemical diagrams and ion balance demonstrated that cation exchange phenomena take place due to salinization processes in the coastal zone and refreshening processes in recharge areas. In these areas, groundwater is locally characterized by increased salinity, which may be partly connate in origin. The code PHREEQC, which is suitable for transport modeling, successfully simulated the extent of the saline front from Vistonis Lagoon to approximately 6 km inland. The application of the code proved that the aquifer system has properties of a dual porosity medium, where exchanges of chemical species take place between flowing and stagnant water through the process of diffusion. The current chemical characteristics of the groundwater under the simulated conditions were achieved when the amount of groundwater equals 1.7 times the pore water volume of the aquifer system.

Hydrogeology Journal, 2004

A large number of chemical analyses of Greek thermal waters were evaluated in order to investigat... more A large number of chemical analyses of Greek thermal waters were evaluated in order to investigate spring water origin, water-rock interaction mechanisms, and estimate the thermal potential of the geothermal areas. Four water types were distinguished from geochemical diagrams. The relatively fresher waters include samples of Ca-HCO 3 and Mg-HCO 3 type waters originating from the schistose Rhodope Massif and the Quaternary basin of Aridea, respectively. Samples of the Na-HCO3 water type are typical of springs located in the post-orogenic basins of northern Greece. These hot, deep-rising Na-HCO 3 waters circulate in a CO 2-rich environment that favours the solubility of alkaline ions such as Na from siliceous rocks. Most of the samples belong to the Na-Cl water type and originate from Greek islands and coastal springs. These are characterized by the mixing of deep thermal solutions with seawater and fresh water. The presence of CO 2 in thermal and mineral springs is due to the metamorphism of buried marine carbonate horizons while H 2 S is due to both local pyrite oxidation and the reduction of sulphates. The use of geothermometers suggested that the investigated geothermal areas have low enthalpy fluids at depth, while higher temperatures are likely present in Milos, Lesvos, Nisyros islands and Xanthi Basin.

Hydrogeology Journal, 2017

Karst aquifers are very complex due to the presence of dual porosity. Rain-runoff hydrological mo... more Karst aquifers are very complex due to the presence of dual porosity. Rain-runoff hydrological models are frequently used to characterize these aquifers and assist in their management. The calibration of such models requires knowledge of many parameters, whose quality can be directly related to the quality of the simulation results. The Sacramento Soil Moisture Accounting (SAC-SMA) model includes a number of physically based parameters that permit accurate simulations and predictions of the rain-runoff relationships. Due to common physical characteristics of mature karst structures, expressed by sharp recession limbs of the runoff hydrographs, the calibration of the model becomes relatively simple, and the values of the parameters range within narrow bands. The most sensitive parameters are those related to groundwater storage regulated by the zone of the epikarst. The SAC-SMA model was calibrated for data from the mountainous part of the Louros basin, northwestern Greece, which is considered to be representative of such geological formations. Visual assessment of the hydrographs as statistical outcomes revealed that the SAC-SMA model simulated the timing and magnitude of the peak flow and the shape of recession curves well.

The Muğla Basin is one of the most well-documented coal basins of Anatolia, SW Turkey. Previous s... more The Muğla Basin is one of the most well-documented coal basins of Anatolia, SW Turkey. Previous studies mainly focused on coal geology, as well as on the environmental impacts from trace elements emitted into the atmosphere during coal combustion. However, the environmental impacts from coal utilization also include groundwater contamination from hazardous trace elements leached from exposed lignite stockpiles or ash disposal dumps. In the present study a comparative assessment of the combustion, as well as the leaching behaviour of trace elements from sixteen lignite, fly ash and bottom ash samples under various pH conditions is attempted. The samples were picked up from three regions in the Muğla Basin, namely, these of Yeniköy, Kemerköy and Yatağan. Proximate and ultimate analyses were performed on all samples. Quantitative mineralogical analysis was carried out using a Rietveld-based full pattern fitting technique. The elements Ag, As, B, Ba, Be, Co, Cr, Cu, Fe, Ga, Hf, Li, Mn, ...

Environmental Earth Sciences, 2019

Neogene formations display complex structure, and host confined aquifers that are alternated, and... more Neogene formations display complex structure, and host confined aquifers that are alternated, and very often interrupted by impermeable clay layers. In many cases, the lack of hydrogeological information and data on those aquifers hinders research and planning of exploitation projects. This study attempts to exploit the available information that can be derived from a sampling, and the corresponding chemical analyses, to reconstruct the hydrogeological image of such areas. Thus, the chemical composition is used as a tool for natural tracing of the groundwater origin and movement in a previously unknown environment such as that of Ilia region, which was selected as the application area. The distribution maps of certain hydrochemical parameters, combined with the appropriate hydrochemical and isotopic data, contributed to the classification of the groundwater samples by linking the hydrochemical processes with the samples' locations as well as the origin of the aquifers' recharge water. At the same time, the effectiveness of the used methodology was evaluated. The use of R-mode factor analysis led to the determination of the basic hydrochemical processes that shape the groundwater quality. The analysis showed that the reducing environment is the defining factor that regulates the presence of the various chemical compounds. Finally, the conceptual model of the aquifers emerged from the analysis of all the data. This analysis also pointed out that the recharge of the local aquifers takes place mainly through the river beds and laterally from their contact with the carbonate rocks.

Bulletin of the Geological Society of Greece, 2007

Farsala Basin presents a remarkable geothermal interest. Areas exhibiting geothermal potential ar... more Farsala Basin presents a remarkable geothermal interest. Areas exhibiting geothermal potential are directly related to faulted zones, represented mainly by cross-faulted systems of E-W, NW-SE and NNE-SSW direction. Thermal waters occur in the areas of Ampelia and Krini in boreholes of 420 m depth. Their temperature ranges between 20,5° and 39,1° C. Thermal waters originate from meteoric waters, which have been infiltrated and heated in great depths, moved towards the surface through faults and hosted in the aquifers of coarse - grained formations find in the area. Their chemical composition is controlled by their contact with the volcanic parts (pillow lavas) of the ophiolithic series. They show alkaline character and low salts concentration. Waters of Ampelia region, which belong to Na-HCO^ type, exhibit temperatures from 27,9° to 39,1° C and low salt concentrations (405- 607 mg/l TDS). On the contrary, waters of Krini area present lower temperatures (20,5° -26,2° C) and higher sal...

Journal of Environmental Radioactivity, 2018

Results of measurements of radon around of the Black Sea are shown. Radon stations in zones of ac... more Results of measurements of radon around of the Black Sea are shown. Radon stations in zones of active faults were placed. Simultaneous hourly measurements of soil radon in 2005 were carried out in the Sivrice Fault Zone that is a segment of East Anatolian Fault System, in the town of Tbilisi (Georgia) and in the South Russia. In 2008 simultaneously hourly measurements of soil radon were carried out in the Western Caucasus (Russia) and in the Mytilene Island (Greece). In 2013 radon in underground waters simultaneously in midday was measuring in Crete (Greece), in the Pamukkale geothermal region (Southwest Turkey) and in the Western Caucasus. Measurements of radon concentration in the points located around of the Black Sea have shown identical regularities in changes of the data. Influence of meteorological, tidal and solar factors on changes of water radon concentrations and soil radon concentrations was observed in all researches points. But this influence was insignificant. Seismological application of observed results also was considered. Various mathematical methods of definition of anomaly in the radon data during earthquakes were considered. During researches in the Black Sea region basically earthquakes with M from 2.0 up to 5.0 and in a depth about 10 km were occurred. For these earthquakes method of daily subtraction of the data of the next and previous day was used. This method has allowed solving a problem with a choice of average value. Probability up to 0.69 (number of earthquakes with radon anomalies/total number of earthquakes) of detection of radon anomalies before earthquakes was achieved applying this method. Changes of radon maps before regional earthquakes were also observed. The frequency analysis of variations of the radon data on the basis of the Wavelet analysis was carried out. Occurrence of the short periods (about 2 days) was observed during regional earthquakes. the Russian Academy of Sciences (GS RAS)). One feature of the Black Sea is the extraordinarily extensive presence of gas emissions from rocks in waters of the Black Sea (Esipovich, 2003). Gas emissions have been observed from the coast of Turkey up to the coast of Georgia in the east and up to the Bulgarian shelf in the west. Gas streams of methane in seawater are connected with mud volcanoes of the Kerch-Taman province and with faults. Therefore, measurements of underground gas concentrations are very important for tectonic and seismological studies. In previous seismological studies performed in

Food and Environmental Virology, 2019

The purpose of this study is to assess the overall impact of different anthropogenic activities i... more The purpose of this study is to assess the overall impact of different anthropogenic activities in the Vouraikos River basin (southwestern Greece, Natura 2000 area). Virological quality of river water samples was investigated. Positive samples for human adenoviruses were found occasionally, while porcine adenoviruses and bovine polyoma viruses were not detected. It is the first time that virological data are collected in the study area.

Bulletin of the Geological Society of Greece, 2017

In the present study the relationship between Rn and hydrochemical parameters in groundwater samp... more In the present study the relationship between Rn and hydrochemical parameters in groundwater samples with the intense tectonics that prevail in the broader region of Aigion were investigated. Radon concentrations were measured in water samples collected from the unconfined aquifer, hosted in Plio-Pleistocene deposits, along the major faults of the research area. The spatial distribution of radon concentrations revealed the existence of three distinct zones along Aigion, Pyrgaki and Helike faults, respectively. The first two zones are characterized by high radon concentrations, whereas the third by low radon concentrations. It is also shown that 222Rn and CO2 concentrations display similar spatial distribution suggesting a common origin for these two gases, with CO2 being the major carrier gas for radon in deep fluids. The deformation and fragmentation of rocks along the fault zones enables the circulation of those fluids resulting in elevated radon concentrations in groundwater. How...

Bulletin of the Geological Society of Greece, 2017

The Muğla Basin is one of the most well-documented coal basins of Anatolia, SW Turkey. Previous s... more The Muğla Basin is one of the most well-documented coal basins of Anatolia, SW Turkey. Previous studies mainly focused on coal geology, as well as on the environmental impacts from trace elements emitted into the atmosphere during coal combustion. However, the environmental impacts from coal utilization also include groundwater contamination from hazardous trace elements leached from exposed lignite stockpiles or ash disposal dumps. In the present study a comparative assessment of the combustion, as well as the leaching behaviour of trace elements from sixteen lignite, fly ash and bottom ash samples under various pH conditions is attempted. The samples were picked up from three regions in the Muğla Basin, namely, these of Yeniköy, Kemerköy and Yatağan. Proximate and ultimate analyses were performed on all samples. Quantitative mineralogical analysis was carried out using a Rietveld-based full pattern fitting technique. The elements Ag, As, B, Ba, Be, Co, Cr, Cu, Fe, Ga, Hf, Li, Mn, ...

Bulletin of the Geological Society of Greece, 2017

The objective of this paper is to study the impact of a reflooding of the former Mouria Lake on t... more The objective of this paper is to study the impact of a reflooding of the former Mouria Lake on the hydraulic state of the Pyrgos area. The hydrogeological data acquired through field work were combined with the volumetric budget and the hydrological data from the entire Alfios River catchment in order to build the conceptual and numerical model of the groundwater flow system, which confirmed the hydraulic state before the drainage of the Mouria Lake. The model was also used to predict the future hydraulic state in case stresses change. For this purpose, Flowpath II, a numerical groundwater flow model, was used to evaluate the impacts of groundwater exploitation in the alluvium unconfined aquifer that is developing in the Holocene deposits. Due to the connection of the aquifer with the surface drainage canals near the coastal zone, the conceptual model was built upon irrigation data, rainfall data, and pumping rate data from the pumping stations that drain the area of the former Mou...