N. Lambrakis
University of Patras, Department of Geolgy, Faculty Member
- Dr. Nikos Lambrakis is Professor at the Section of Applied Geology and Geophysics and head of the laboratory of Hydro... moreDr. Nikos Lambrakis is Professor at the Section of Applied Geology and Geophysics and head of the laboratory of Hydrogeology at at the Department of Geology of the University of Patras. His scientific interests are dealing with the study, the management and the protection of the natural water resources, i.e. the surface water, the groundwater, as well as the mineral and thermal water. He has an extensive expertise on the above mentioned subjects being closely related to important environmental issues. In the last years he is particularly interested on the study of the human impacts on natural water resources such as the impact of the intense groundwater pumping from coastal aquifers. He has been granted more than 30 projects both from State and Industry affiliations and published more than 130 papers in Greek and international journals and congress proceedings, in subjects of his interests. He also published from Liberal Books in Greek the Book “Courses of Applied and Environmental Hydrogeology”. His papers received more than 1100 citations in the SCI system. Prof. Lambrakis is member of the Geological Society of Greece, the Hellenic Committee of Hydrogeology and the International Association of Hydrogeologists.(Dr. Nikos Lambrakis is Professor at the Section of Applied Geology and Geophysics and head of the laboratory of Hydrogeology at at the Department of Geology of the University of Patras. His scientific interests are dealing with the study, the management and the protection of the natural water resources, i.e. the surface water, the groundwater, as well as the mineral and thermal water. He has an extensive expertise on the above mentioned subjects being closely related to important environmental issues. In the last years he is particularly interested on the study of the human impacts on natural water resources such as the impact of the intense groundwater pumping from coastal aquifers. He has been granted more than 30 projects both from State and Industry affiliations and published more than 130 papers in Greek and international journals and congress proceedings, in subjects of his interests. He also published from Liberal Books in Greek the Book “Courses of Applied and Environmental Hydrogeology”. His papers received more than 1100 citations in the SCI system. Prof. Lambrakis is member of the Geological Society of Greece, the Hellenic Committee of Hydrogeology and the International Association of Hydrogeologists.)edit
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... 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, ...
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Research Interests: Environmental Science, Geology, Hydrology, Groundwater, Multidisciplinary, and 15 moreGroundwater recharge, Factor analysis, Seawater Intrusion, Porous Media, Groundwater Quality, Coastal Aquifer, AQUIFER, Coastal Zone, Water Level, Elsevier, Cation Exchange, Integrated Water Resource Management, Pore Water, Coastal Area, and transport process
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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... 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, ...
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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... 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...
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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... 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...
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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... 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, ...
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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... 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...
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ABSTRACT This paper presents the structure and contents of a hydro - geological GIS database that stores hydro - geological data and constitutes the basis for processing and extracting spatial and non spatial data. The geodatabase... more
ABSTRACT This paper presents the structure and contents of a hydro - geological GIS database that stores hydro - geological data and constitutes the basis for processing and extracting spatial and non spatial data. The geodatabase contains information on hydrology, hydrography, hydrochemistry, geology, topography, land use, protected area, administration as well as the maps that were produced using the data from the base. Additional data that related to hydrogeological study of the lakeside area located at the NW part of lake Trichonida and DEMs are also included at this database. Then a part of these files were used to make hyper- links whose objective was to give direct access to tables of precipitation and chemical data. With the SQL, various queries have been set in order to lead to the data retrieval. This hydrogeological database is implemented within a GIS (geographic information system) framework coupled to a Relational Database Management System (RDBMS) as a file geodatabase (ESRI format) GIS technology. At this point must be emphasized the dynamic nature of the database as well as provide support for a multiuser environment. The structure of the hydro - geological database presented at this paper is exemplified for a study site around Aitoloakarnania in Western Greece.
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The hydrochemical character of the Zacharo basin groundwaters and their suitability for drinking and irrigation purposes are evaluated in this paper. The Pindos karst aquifer, the Neogene and the alluvial aquifer are the three most... more
The hydrochemical character of the Zacharo basin groundwaters and their suitability for drinking and irrigation purposes are evaluated in this paper. The Pindos karst aquifer, the Neogene and the alluvial aquifer are the three most mportant aquifers of the study area. 46 water samples were taken from wells, boreholes and spring and they analyzed for the physicochemical parameters (pH, EC and TOC), major ions (Ca2+, Mg2+, Na+, K+, NH4+, HCO3-, Cl-, F-, SO4 2- and NO3-) and trace metals (B, Fe, Mn, Cr, Pb, Se, Ni). The suitability of groundwaters for drinking and irrigation is evaluated by the calculation of Water Quality Index and the indices SAR, %Na, RSC and KR. The water of the karstic and alluvial aquifer is of “excellent” quality for both uses. On the other hand, the Neogene aquifer shows serious problems in respect with the degradation of water quality, since 20% of the samples are of “poor” and “extremely poor” quality for drinking purposes and 33% are “unsuitable” for irrigat...
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A hydrogeological study took place in the broader area of Mesologgi – Aitoliko lagoons (West Greece) aiming at the investigation of a) the hydrogeological conditions of the area as well as the surface and groundwater influences on the... more
A hydrogeological study took place in the broader area of Mesologgi – Aitoliko lagoons (West Greece) aiming at the investigation of a) the hydrogeological conditions of the area as well as the surface and groundwater influences on the quality of the clay deposits found in the lagoons and b) the properties of the clay in order to be identified as "therapeutic peloids". Due to their location, the clay deposits could be influenced and possibly polluted from the surface waters. The aquifer of the unconsolidated formations presents low hydraulic conductivity, while the carbonate aquifer is bounded from the foregoing aquifer and therefore the possibility of clay pollution from the ground-water is very limited. pH of the sediments showing neutral and alkaline values, limits the mobility of some pollutants. Seawater affects some of the clay samples, which present high electrical con-ductivity. Iron and manganese show also high concentrations, while some of trace elements such as C...
Research Interests: Geology, Water, Statistical Analysis, Agriculture, Environmental Monitoring, and 13 moreMultidisciplinary, Factor analysis, Discriminant Analysis, Water Supply, Nitrates, Cluster Analysis, Fertilizers, Five Factor Model, Water Movements, Organic Matter, Geographic Information Systems, Environmental Parameter, and Unsaturated Zone
The assessment of groundwater vulnerability to pollution has proved to be an effective tool for the delin-eation of protection zones in areas affected by groundwater contamination due to intensive fertilizer applications. By modifying and... more
The assessment of groundwater vulnerability to pollution has proved to be an effective tool for the delin-eation of protection zones in areas affected by groundwater contamination due to intensive fertilizer applications. By modifying and optimizing the well known and widely used DRASTIC model it was possible to predict the intrinsic vulnerability to pollution as well as the groundwater pollution risk more accurately. This method incorporated the use of simple statistical and geostatistical techniques for the revision of the factor ratings and weightings of all the DRASTIC parameters under a GIS environment. The criterion for these modifications was the correlation coefficient of each parameter with the nitrates concentration in groundwater. On the basis of their statistical significance, some parameters were subtracted from the DRASTIC equation, while land use was considered as an additional DRASTIC parameter. Following the above-mentioned modifications, the correlation coefficient between groundwater pollution risk and nitrates concentration was considerably improved and rose to 33% higher than the original method. The model was applied to a part of Trifilia province, Greece, which is considered to be a typical Mediterranean region with readily available hydrogeological and hydrochemical data.
Abstract The Louros Basin hosts one of the most important karst systems of Epirus Prefecture (Greece) and plays a key role in supplying three counties with drinking water. Aiming to investigate the origin of groundwater and its flow... more
Abstract
The Louros Basin hosts one of the most important karst systems of Epirus Prefecture (Greece) and plays a key role in supplying three counties with drinking water. Aiming to investigate the origin of groundwater and its flow patterns, a multi-tracer approach was used to describe and evaluate the hydrogeology of the system. Therefore, 271 surface water and groundwater samples were collected and analyzed for physicochemical parameters, major ions, and trace and rare earth elements, as well as stable isotopes (δ18O and δ2H). These data provided meaningful tracing of the water origin, water–rock interaction processes, and relationships among the aquifers. In particular, the elaboration of the major ions supported by the distribution of rare earth elements indicated that there are three aquifers located at different levels hosted in the Senonian and Pantokrator limestone formations. These aquifers are hydraulically interconnected by a cascade and constitute the Louros karst system which is drained by the homonymous river. Hydrochemical and isotopic data revealed that the Louros karst system is isolated from the adjacent northern Ioannina Basin and it is being recharged by precipitation. Higher groundwater salinity, where present, is mainly associated with increased water–rock interaction due to longer and deeper hydrologic flow, favoring the dissolution of evaporitic, carbonate and phosphate minerals.
The Louros Basin hosts one of the most important karst systems of Epirus Prefecture (Greece) and plays a key role in supplying three counties with drinking water. Aiming to investigate the origin of groundwater and its flow patterns, a multi-tracer approach was used to describe and evaluate the hydrogeology of the system. Therefore, 271 surface water and groundwater samples were collected and analyzed for physicochemical parameters, major ions, and trace and rare earth elements, as well as stable isotopes (δ18O and δ2H). These data provided meaningful tracing of the water origin, water–rock interaction processes, and relationships among the aquifers. In particular, the elaboration of the major ions supported by the distribution of rare earth elements indicated that there are three aquifers located at different levels hosted in the Senonian and Pantokrator limestone formations. These aquifers are hydraulically interconnected by a cascade and constitute the Louros karst system which is drained by the homonymous river. Hydrochemical and isotopic data revealed that the Louros karst system is isolated from the adjacent northern Ioannina Basin and it is being recharged by precipitation. Higher groundwater salinity, where present, is mainly associated with increased water–rock interaction due to longer and deeper hydrologic flow, favoring the dissolution of evaporitic, carbonate and phosphate minerals.
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Research Interests: Civil Engineering, Environmental Geology, Groundwater Pollution, Earth and Environmental Sciences, Seawater Intrusion, and 9 moreWater balance, Groundwater Quality, Drinking Water Quality, Human Activity, Interdisciplinary Engineering, Long Term Effect, Boundary Condition, Cation Exchange, and Coastal Area
... Almyros springs' recharge area is situated in the area of Drasi and Selena. ... Acta, 61:17, 3605-3618 Johannesson, KH, Farnham, IM, Guo, C, and Stetzenbach, KJ (1999) Rare earth element fractionation and concentration variations... more
... Almyros springs' recharge area is situated in the area of Drasi and Selena. ... Acta, 61:17, 3605-3618 Johannesson, KH, Farnham, IM, Guo, C, and Stetzenbach, KJ (1999) Rare earth element fractionation and concentration variations along a groundwater flow path within a shallow ...
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Page 1. Nonlinear analysis and forecasting of a brackish karstic spring N. Lambrakis,1,2 AS Andreou,2,3 P. Polydoropoulos,2,4 E. Georgopoulos,3 and T. Bountis2,5 Abstract. Nonlinear methods and artificial neural network ...
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The Kokkino Stefani spring is located in western Greece on the NE shore of Trichonis Lake, which is the largest lake of the country. The climate is semi-arid with water excess and deficiency during winter and summer, respectively. The... more
The Kokkino Stefani spring is located in western Greece on the NE shore of Trichonis Lake, which is the largest lake of the country. The climate is semi-arid with water excess and deficiency during winter and summer, respectively. The area belongs to the Olonos-Pindos isopic zone consisting of a pre-orogenic sequence of deep-sea sediments successed by syn-orogenic flysch deposits. The contact of karstified Upper Cretaceous limestones with cherts gives rise to most of the springs in Trichonis catchment area with Myrtia spring as a typical example. According to the geological setting, a similar mechanism could also be applied for Kokkino Stefani. However, the discharge values are not consistent with this scenario. Hydrochemical analyses performed on samples collected on a 20-day basis showed that the Kokkino Stefani spring is classified to the Na–Ca–HCO3 type, displays higher temperature, negative Eh values and is enriched in H2S, F, Na, B and Li; thus being totally different from the Myrtia spring and Trichonis Lake. H2S is of biogenic origin, whereas high F concentrations are due to Ca precipitation. High B and Li values enabled the suggestion of an alternative function mechanism, which involves the existence of a deep aquifer with restricted size and the development of the spring at its current site due to isostatic pressure.