Konstantinos Voudouris
Aristotle University of Thessaloniki, Geology, Faculty Member
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Competing multi-sectorial water demands as well as demands for ecosystem services in coastal aquifers exert significant pressures to local water resources. Climate change is already altering spatiotemporal rainfall and runoff... more
Competing multi-sectorial water demands as well as demands for ecosystem services in coastal aquifers exert significant pressures to local water resources. Climate change is already altering spatiotemporal rainfall and runoff distributions intensifying the management challenge. In this context, this work is looking at the impact of water allocation practices on the aquifer of the Axios river delta under climate change impact scenarios. The area is characterized by agricultural activities, primarily water intensive rice cultivation. Urban water supply is supported by the exploitation of the local aquifer. Reduced precipitation is expected to increase the risk of salinisation of this coastal aquifer. At the same time, a decrease in river flow was recorded during the last decades. Numerical simulations of groundwater – surface water interactions are carried out to understand process dynamics. A drought scenario is simulated to assess the impact of climate change and the corresponding drought management response plan on the shifting fresh/saltwater interface. The drought response scenario involves banning irrigation and increasing groundwater abstraction. The groundwater model shows that flood irrigation forms a hydraulic barrier to saline intrusion. This type of groundwater model predictions can inform water resources management policies and examine the effectiveness of interventions to support sustainable socioeconomic activity while protecting environmental health.
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This paper investigates the suitability of a specific site for the construction of a sanitary landfill. The following works were performed: detailed geological mapping at a scale of 1:5,000, a geological-hydrogeological cross-section of... more
This paper investigates the suitability of a specific site for the construction of a sanitary landfill. The following works were performed: detailed geological mapping at a scale of 1:5,000, a geological-hydrogeological cross-section of the sanitary landfill, drilling exploration including the construction of a deep borehole for the detection of any perched aquifer, core logging and in situ permeability tests, implementation of the DRASTIC and EPIC methods to estimate the aquifer’s vulnerability. Finally estimation of the total annual amount of solid waste that will be deposited into the sanitary landfill and determination of the pollution load.
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... Mattas, M. Sotiriadis Aristotle University of Thessaloniki, Department of Geology gsoulios@geo.auth.gr Abstract This paper deals with the land subsidence due to groundwater overex-ploitation in Anargyri village (Florina prefecture,... more
... Mattas, M. Sotiriadis Aristotle University of Thessaloniki, Department of Geology gsoulios@geo.auth.gr Abstract This paper deals with the land subsidence due to groundwater overex-ploitation in Anargyri village (Florina prefecture, West Macedonia). ...
Research Interests: Geography, Geology, Hydrogeology, Groundwater, The, and 3 moreWater Table, AQUIFER, and Overexploitation
The Gallikos river basin is located in the northern part of Greece and discharges into the Thermaikos Gulf, North Aegean sea. Three main tributaries contribute to the river, the basin of which has a total areal extent of 930 km2. The... more
The Gallikos river basin is located in the northern part of Greece and discharges into the Thermaikos Gulf, North Aegean sea. Three main tributaries contribute to the river, the basin of which has a total areal extent of 930 km2. The basin of Gallikos river is formed of metamorphic rocks, limestones, Neogene and Quaternary deposits. Groundwater resources are mainly located within the carbonate rocks and the quaternary deposits. Water quality deterioration is documented based on the performed hydrochemical analyses of samples collected along the river course and its tributaries during the end of the wet and the dry seasons of year 2004. Results were correlated to the groundwater quality as this is reflected by analyses conducted on samples collected from wells adjacent to the river over the same periods. Samples were analyzed for major ions, nitrates, BOD5, COD, heavy metals and boron, whilst in situ measurements of pH, electrical conductivity and water temperature were performed. Ri...
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Triggering hydrological simulations with climate change gridded datasets is one of the prevailing approaches in climate change impact assessment at a river basin scale, with bias correction and spatio-temporal interpolation being... more
Triggering hydrological simulations with climate change gridded datasets is one of the prevailing approaches in climate change impact assessment at a river basin scale, with bias correction and spatio-temporal interpolation being functions routinely used on the datasets preprocessing. The research object is to investigate the dilemma arisen when climate datasets are used, and shed light on which process—i.e., bias correction or spatio-temporal interpolation—should go first in order to achieve the maximum hydrological simulation accuracy. In doing so, the fifth generation of the European Centre for Medium Range Weather Forecasts (ECMWF) Reanalysis v5 (ERA5) temperature and precipitation products of 9 × 9 km spatial resolution, which are considered as the reference data, are initially compared with the same hindcast variables of a regional climate model of 12.5 × 12.5 km spatial resolution over a specific case study basin and for a 10-year period (1991–2000). Thereafter, the climate m...
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The application of multivariate statistical analyses of hydrochemical data has proved to bemost successful in the assessment of groundwater hydrochemistry, especially in situationswhere numerous samples are available. Fifteen (15)... more
The application of multivariate statistical analyses of hydrochemical data has proved to bemost successful in the assessment of groundwater hydrochemistry, especially in situationswhere numerous samples are available. Fifteen (15) hydrochemical parameters were considered(pH, E.C., T.D.S., T.H, Ca, Mg, Na, K, HCO3, Cl, SO4, NO3, NO2, NH4, PO4) in 131 samplescollected from the alluvial aquifer of NE Korinthia, during May 1997. Simple and multipleregression, factor, and trend-surface analyses were applied in order to examine the importance ofeach parameter, investigate correlations among them, and separate them into groups. Statisticalfactors were selected and their geographical distribution was mapped. It was concluded thatuse of such methods reveal the prevailing evolutionary mechanisms of the studied system,thus enabling accurate and relatively quick hydrochemical assessments.
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Millstones were water powered, horizontal or vertical wheeled, since the 1st century BC, according to written documents. The raw materials used in ancient Greece for manufacturing millstones since the Prehistoric times, were very... more
Millstones were water powered, horizontal or vertical wheeled, since the 1st century BC, according to written documents. The raw materials used in ancient Greece for manufacturing millstones since the Prehistoric times, were very restricted, mainly sandstones and volcanic or pyroclastic rocks. The sources of the raw materials for the millstones in Greece varied throughout the times depending on the quality and suitability of the rocks. The Aegean islands Milos, Kimolos, Polyaigos, Santorini, Nisyros, Skyros, Aigina, Limnos, Mytilini, and other areas such as Poros and Methoni in Peloponnesos were some of the provenance locations where the millstones were quarried and exported in other areas. In Macedonia and Thrace the main raw materials were from local sources in the beginning, during the Prehistoric times. Later, a more intense production of millstones started in various areas depending on the rock type of the raw materials. Representative examples for millstones made of sandstones...
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Groundwater potential maps constitute a valuable tool for groundwater sustainable management in arid regions. In this study, a groundwater potential map was developed for the Asadabad plain (Iran). The method deployed remote sensing... more
Groundwater potential maps constitute a valuable tool for groundwater sustainable management in arid regions. In this study, a groundwater potential map was developed for the Asadabad plain (Iran). The method deployed remote sensing techniques and hierarchical analysis, while geoelectric data were used to verify the results of the study. The methodology used extracted information from thematic maps including lithology, the density of lineaments, drainage density, topography, slope, slope aspect, land use, distance from streams, distance from lineaments, rainfall, and air temperature. All different layers of information were classified as standard maps by expert judgment and field visits, and each category is ranked from 1 to 10 according to its degree of importance. Also, each layer is assigned an appropriate weight based on the groundwater potential using the hierarchical analysis process. The resulting map of the study area was quantitatively and qualitatively zoned into five classes: excellent, good, moderate, very low, and poor. The results obtained were compared with field electrical resistivity surveys and a high correlation was found. The results obtained from the groundwater potential map were validated by comparison with lithologic and water-level data, thus demonstrating the accuracy of the applied method.
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The scope of this study is to assess the effects of agronomic and water resources management scenarios on groundwater balance, seawater intrusion, and nitrate pollution and the comparison of the developed scenarios relative to the current... more
The scope of this study is to assess the effects of agronomic and water resources management scenarios on groundwater balance, seawater intrusion, and nitrate pollution and the comparison of the developed scenarios relative to the current crop production and water management regime in the coastal agricultural Almyros basin in the Thessaly region, Greece. Agronomic and water resources scenarios have been simulated and analyzed for a period of 28 years, from 1991 to 2018. The analysis has been conducted with the use of an Integrated Modeling System for agricultural coastal watersheds, which consists of coupled and interlinked simulation models of surface water hydrology (UTHBAL), reservoir operation (UTHRL), agronomic/nitrate leaching model (REPIC), and groundwater models for the simulation of groundwater flow (MODFLOW) and contaminant transport of nitrates (MT3DMS) and chlorides (SEAWAT). The pressure on water resources has been estimated with the Water Exploitation Index (WEI+) and ...
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Many springs have been recorded in Greece; some of them are characterized as thermo-mineral springs and are associated with their position between Eurasia and Africa, the volcanic activity, and the presence of tectonic faults. The... more
Many springs have been recorded in Greece; some of them are characterized as thermo-mineral springs and are associated with their position between Eurasia and Africa, the volcanic activity, and the presence of tectonic faults. The therapeutic use of water (hydrotherapy) has been recorded in ancient Greece since at least 1000 BC. Asclepius was the god of medicine in ancient Greek religion and priests operated his worship centers (Asclepieia) offering medical services in areas with proper climatic conditions. In historical times, Hippocrates from the Aegean island of Kos (460–375 BC) is considered the father of scientific medicine as well as hydrotherapy. During the Hellenistic period, the significance of water in health was widely recognized. In the Roman era, many doctors evolved hydrotherapy treatment and the use of hot baths continued in the early Byzantine period until the sixth century AD. Finally, during the Ottoman period, the kind of respiratory bath, named Hamam, was the dom...
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Nowadays, the reuse of built agricultural/industrial heritage has been a common practice worldwide. These structures represent excellent symbols of the great agricultural/industrial past. These agricultural/hydro-technologies also serve... more
Nowadays, the reuse of built agricultural/industrial heritage has been a common practice worldwide. These structures represent excellent symbols of the great agricultural/industrial past. These agricultural/hydro-technologies also serve as monuments of socio-cultural identities, especially in rural areas and on small farms. One example of a successful application of agricultural technologies for small farms is the water mill. By harnessing the water energy, they were used for traditional flour and other goods production (e.g., olive oil) and works requiring energy, with the main role in the evolution of the traditional/cultural landscape. Water mills have been used to drive a mechanical process of milling, hammering, and rolling and are a portion of the agricultural, cultural, and industrial heritage. For approximately two millennia, the vertical mill water wheel prepared the initial source of mechanical power in many regions of the world. Water mills were the first device that conv...
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The prospect of the global population reaching 9 billion by 2050, in addition to growing urbanisation, intensive irrigated agriculture and climate change, will add extra pressures on water resources and the environment [...]
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This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
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Groundwater potential maps constitute a valuable tool for groundwater sustainable management in arid regions. In this study, a groundwater potential map was developed for the Asadabad plain (Iran). The method deployed remote sensing... more
Groundwater potential maps constitute a valuable tool for groundwater sustainable management in arid regions. In this study, a groundwater potential map was developed for the Asadabad plain (Iran). The method deployed remote sensing techniques and hierarchical analysis, while geoelectric data were used to verify the results of the study. The methodology used extracted information from thematic maps including lithology, the density of lineaments, drainage density, topography, slope, slope aspect, land use, distance from streams, distance from lineaments, rainfall, and air temperature. All different layers of information were classified as standard maps by expert judgment and field visits, and each category is ranked from 1 to 10 according to its degree of importance. Also, each layer is assigned an appropriate weight based on the groundwater potential using the hierarchical analysis process. The resulting map of the study area was quantitatively and qualitatively zoned into five classes: excellent, good, moderate, very low, and poor. The results obtained were compared with field electrical resistivity surveys and a high correlation was found. The results obtained from the groundwater potential map were validated by comparison with lithologic and water-level data, thus demonstrating the accuracy of the applied method.
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This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
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This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Research Interests:
This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Research Interests:
Many springs have been recorded in Greece; some of them are characterized as thermo-mineral springs and are associated with their position between Eurasia and Africa, the volcanic activity, and the presence of tectonic faults. The... more
Many springs have been recorded in Greece; some of them are characterized as thermo-mineral springs and are associated with their position between Eurasia and Africa, the volcanic activity, and the presence of tectonic faults. The therapeutic use of water (hydrotherapy) has been recorded in ancient Greece since at least 1000 BC. Asclepius was the god of medicine in ancient Greek religion and priests operated his worship centers (Asclepieia) offering medical services in areas with proper climatic conditions. In historical times, Hippocrates from the Aegean island of Kos (460-375 BC) is considered the father of scientific medicine as well as hydrotherapy. During the Hellenistic period, the significance of water in health was widely recognized. In the Roman era, many doctors evolved hydrotherapy treatment and the use of hot baths continued in the early Byzantine period until the sixth century AD. Finally, during the Ottoman period, the kind of respiratory bath, named Hamam, was the dominant form in public baths. Their temperature ranges between 20.5 and 83 °C, and the dominant hydrochemical type is Na-Cl. This review describes the history of hydrotherapy in Greece through the centuries, the physicochemical characteristics of thermal springs, as well as contemporary and future trends and challenges are presented. Keywords Asclepieia • Balneotherapy • Classical and Hellenistic periods • Medicine • Water …του δε ύδατος χρεία και χειμώνος και θέρους, και νοσούσι και υγιαίνουσι, νυκτός και μεθ'ημέραν…. …water is important both in winter and summer, in patients and healthy, in night and day…. Plutarch (Ploutarchos) (46-120 AD), ancient Greek Historian and Philosopher.
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Evaluation of the hydraulic parameters of aquifers is essential for estimating and developing groundwater resources. Constant discharge pumping tests, monitoring the groundwater level variations in observation wells, can be expensive and... more
Evaluation of the hydraulic parameters of aquifers is essential for estimating and developing groundwater resources. Constant discharge pumping tests, monitoring the groundwater level variations in observation wells, can be expensive and time consuming. This paper introduces an approach that is efficient and economical and probably can replace the full pumping test. Well- choosing through field survey, constant discharge pumping tests and step drawdown tests are used in this study to determine the transmissivity (T) of the Kangavar aquifer, located in western Iran. To describe the geological characteristics of the subsurface formations, 16 vertical electrical soundings were performed and interpreted using Schlumberger array. To estimate the transmissivity by a step drawdown test, the aquifer coefficient (n) in well was computed by solving the Miller and Weber equation, through Fixed Point Iteration numerical method by using Visual Basic 6.5 programming. Contours of transmissivity attained through constant discharge and step drawdown tests were plotted for the study area, using kriging method. The results obtained were analyzed applying statistical comparisons, through which no significant difference was observed. Finally, it is concluded that step drawdown test can be used as an alternative to the expensive and time consuming constant discharge tests.
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This article deals with the impacts of past mining activities andinefficient water resources management on groundwater quality inthe Lavrio area. Thirty-three water samples were collectedduring March 1998 and were analyzed for major ions... more
This article deals with the impacts of past mining activities andinefficient water resources management on groundwater quality inthe Lavrio area. Thirty-three water samples were collectedduring March 1998 and were analyzed for major ions (Ca, Mg, Na,K, HCO3, Cl, NO3, SO4, PO4), trace elements(Fe, Pb, Ni, Zn, Mn, Cu, Cr, Cd) and water parameters (Temperature,pH, conductivity, hardness and SiO2). High concentrationsof heavy metals (lead, cadmium, zinc, nickel) are recorded ingroundwater samples in the Lavrio area. The highestconcentrations are recorded in the unconfined aquifer (alluvialdeposits and schists), due to mining activities. Qualitydeterioration of groundwater is also decumented and attributedto seawater intrusion and nitrate pollution of agriculturalorigin. The data were subjected to simple correlation analysisand R-mode factor analysis in order to examine the relationshipsbetween the parameters. There is a relationship between theelements participating in the sulfide (Pb, ...
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... groundwater). The construction of Durov and Piper graphs to classify the water samples (Lloyd and Heathcote, 1985), and the presentation of the results, were carried out using Excel, SPSS and Aquachem software. Techniques ...
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... 75, GR-118 55, Athens, Greece 2 Department of Geology, University of Patras GR 261 10, Patras,Greece ... In this paper the groundwater quality of the southern part of Korinthos region (north-east ... The area is crossed by a fault... more
... 75, GR-118 55, Athens, Greece 2 Department of Geology, University of Patras GR 261 10, Patras,Greece ... In this paper the groundwater quality of the southern part of Korinthos region (north-east ... The area is crossed by a fault system parallel to the coastline, and the Quaternary ...
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Research Interests: Civil Engineering, Geology, Hydrogeology, Groundwater, Economic Development, and 10 moreGroundwater recharge, Field Experiment, AQUIFER, Borehole, Groundwater flow, Industrial Location, Water Resource, Integrated Water Resource Management, Bulletin of Engineering Geology and the Environment", and dry period
International audienc
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Uranium (U) pollution in groundwater has become a serious problem worldwide. Even in low concentrations, U has both radiological and toxicological impacts on human health. In this study an integrated hydrogeological approach was applied... more
Uranium (U) pollution in groundwater has become a serious problem worldwide. Even in low concentrations, U has both radiological and toxicological impacts on human health. In this study an integrated hydrogeological approach was applied to conceptualize an aquifer system, and determine the origin of U detected in the aquifer of the eastern Halkidiki region in northern Greece. Data from measurements of groundwater level and hydrochemical and stable isotope analyses of groundwater samples were applied to perform geochemical modeling and multivariate statistical analysis. The modeling and statistical analysis identified three hydrogeochemical groups within the studied hydro-system, and U(VI) as the dominant U species. The first group is linked to the deeper aquifer which is characterized by water-rock interactions with weathering products of granodiorite. In this group the dominant U species is uranyl phosphate and U concentration is 3.7 μg/L. The upper aquifer corresponds to the second hydrogeochemical group where U concentrations are mainly influenced by high concentrations of nitrogen species (NO3- and NO2-). Factor analysis further discriminated the upper aquifer into a saline coastal zone and an inland zone impacted by agricultural activities. The third hydrogeochemical group presents the highest concentration of U (up to 15 μg/L) in groundwater and corresponds to the internal aquifer system. The U within this system is triggered by the presence of Mn2+, while the long residence time of the groundwater contributes synergistically to the hydrogeochemical process. Manganese triggers U oxidation in parallel with Fe2+ precipitation that acts as a regulator of U concentration. Groundwater depletion of the upper aquifers promotes the up-coning of geothermal fluids from fault zones leading to increased concentrations of U in the mid-depth aquifers.
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Advanced, well organized, and operated urban water supply systems existed in Greece from the Bronze Age (ca. 3200–1100 BC). At the dawn of human history, surface water and groundwater, principally springs, were the most common water... more
Advanced, well organized, and operated urban water supply systems existed in Greece from the Bronze Age (ca. 3200–1100 BC). At the dawn of human history, surface water and groundwater, principally springs, were the most common water supply sources. As the population grew, periodic water shortages occurred. In Early Minoan times (ca. 3200–2100 BC), these water shortages led to the development of sophisticated hydraulic structures for importing water and for the harvesting and storage of rainwater. In addition, the water treatment technologies and water distribution techniques developed at that time served as the basis for the advanced technological progress in the development of the urban water supply systems in the centuries that followed. In this paper, an overview of the evolution of public water supplies and water treatment technologies in the Hellenic world through the centuries up to modern times is presented. Some of the most significant innovations in the provision of water, ...
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The alluvial aquifer system of the Florina basin (320 km2) in North Greece is a representative area where irrigated agriculture is applied. Groundwater is the main source of water. The highest and mean nitrate concentrations in... more
The alluvial aquifer system of the Florina basin (320 km2) in North Greece is a representative area where irrigated agriculture is applied. Groundwater is the main source of water. The highest and mean nitrate concentrations in groundwater are 67.9 mg/L and 25 mg/L, respectively. High values could be associated with the use of nitrogen fertilizers from agricultural activities. This study deals with the evaluation of the groundwater quality. For this reason, hydrochemical analyses from 29 groundwater samples and water level measurements were performed for the wet and dry periods of 2016. The suitability of groundwater quality for irrigation purposes is examined by using different indices (Chlorinity Index, SAR, Sodium Percentage, Potential Salinity and Kelly’s index). In addition, the DRASTIC method was modified by using statistical methods, land use map and nitrate concentrations and applied in order to assess the groundwater vulnerability to external pollution. Notably, there was n...
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Karst aquifers are valuable water resources in terms of quantity and quality, hence, their protection and rational management is of utmost importance to sustain water supply. An overview of research articles regarding Karst aquifers in... more
Karst aquifers are valuable water resources in terms of quantity and quality, hence, their protection and rational management is of utmost importance to sustain water supply. An overview of research articles regarding Karst aquifers in Greece was obtained revealing that progressively the initial simple statistical analysis was replaced from advanced tools but rarely coupled. Additionally, a combined approach including the concept of groundwater vulnerability and pollution risk in conjunction with statistical and hydrodynamic analysis was performed in the complex karst aquifer of Damasi-Titanos in Thessaly Central Greece. The karst aquifer discharges via three springs and it is in dynamic interaction with one of the two rivers that cross the system. The water demands of the area are mainly met with groundwater from the karst aquifer rendering its protection fundamental priority for the sustainability of the area. The hydrodynamic analysis of the karst system was performed by pairing ...
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Shallow aquifers are the most accessible reservoirs of potable groundwater; nevertheless, they are also prone to various sources of pollution and it is usually difficult to distinguish between human and natural sources at the watershed... more
Shallow aquifers are the most accessible reservoirs of potable groundwater; nevertheless, they are also prone to various sources of pollution and it is usually difficult to distinguish between human and natural sources at the watershed scale. The area chosen for this study (the Campania Plain) is characterized by high spatial heterogeneities both in geochemical features and in hydraulic properties. Groundwater mineralization is driven by many processes such as, geothermal activity, weathering of volcanic products and intense human activities. In such a landscape, multivariate statistical analysis has been used to differentiate among the main hydrochemical processes occurring in the area, using three different approaches of factor analysis: (i) major elements, (ii) trace elements, (iii) both major and trace elements. The elaboration of the factor analysis approaches has revealed seven distinct hydrogeochemical processes: i) Salinization (Cl, Na); ii) Carbonate rocks dissolution; iii)...
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The aim of this study is to evaluate climate model hydrological parameters in comparison to recorded hydrological data and estimate the impacts of climate change on water balance. For this purpose, a combination of climate model... more
The aim of this study is to evaluate climate model hydrological parameters in comparison to recorded hydrological data and estimate the impacts of climate change on water balance. For this purpose, a combination of climate model precipitation and temperature data and Thornthwaite method was applied for the period 1988-2000 and the future periods 2028-2040, 2058-2070 and 2088 2100. The application of this combination was carried out in a coastal region in Southeastern part of Korinthiakos Gulf (southern Greece). The area is suitable for this target, because it is characterized by urbanization, intensive agriculture and tourism development, with increasing water demands. The evaluation of climate model parameters in comparison to observed data shows that the RegCM3 model is a reliable model. According to the future projections and the Thornthwaite method, the real evapotranspiration is estimated to increase, as a result precipitation decrease and temperature increase.
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The aim of this study was to determine the extent and geometrical characteristics of seawater intrusion in the coastal aquifer of the eastern Thermaikos Gulf, Greece. Hydrochemical data and geoelectrical measurements were combined and... more
The aim of this study was to determine the extent and geometrical characteristics of seawater intrusion in the coastal aquifer of the eastern Thermaikos Gulf, Greece. Hydrochemical data and geoelectrical measurements were combined and supplemented to determine the hydrochemical regime of the study site in regard to seawater phenomena. Chemical analysis of groundwater was performed in 126 boreholes and fifteen electrical resistivity tomographies (ERT) were measured, whereas in two sites the ERT measurements were repeated following the wet season. The Cl(-) concentrations recorded reached 2240 mg/L indicating seawater intrusion which was also verified by ionic ratios. The ionic ratios were overlapped and a seawater intrusion map (SWIM) was produced. A significant part of the coastal aquifer (up to 150 km(2)) is influenced by seawater intrusion. The areas with the most intensive salinization are located between Nea Kallikratia-Epanomi and Aggelochori-Peraia. According to the ERTs, in the influenced areas the salinization of the aquifer exceeds 1 km toward the mainland and its depth reaches 200 m. In the area surrounding Thessaloniki airport, the ERTs revealed salinization of the upper aquifer to depths of up to 40 m, whereas the lower aquifer is uninfluenced. This abnormal distribution of seawater intrusion demonstrates the value of geoelectrical methods in the study of seawater intrusion especially in areas with limited available hydrochemical data.
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This paper aims at presenting the study of groundwater quality and more specifically of the aquifer and the leachates of subsoil at the central part of Viotikos Kifisos river basin-central Greece. Quality characterization of the aquifer... more
This paper aims at presenting the study of groundwater quality and more specifically of the aquifer and the leachates of subsoil at the central part of Viotikos Kifisos river basin-central Greece. Quality characterization of the aquifer system was based on the principles set in the Water Framework Directive-WFD (2000/60/EC), adopting as standards the maximum admissible concentrations for water intended for human consumption. Results were based on the analysis of hydrochemical determinations carried out in 194 water samples collected from the vadose zone (through a prototype sampling system) and the shallow wells of the saturated zone, over the period 2009-2011. Spatio-temporal study of water quality characteristics was performed and the hydrochemical character of water samples was assessed using the expanded Durov diagram. As suggested by the analysis of the hydrochemical data, the bedrock of the basin that is formed of carbonate rocks and a schist-chert formation with ultrabasic bl...
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Groundwater and saline intrusion. Selected papers from the 18th Salt Water Intrusion Meeting. Cartagena, Spain. Publ. Geological Survey of Spain (ed. L. Araguas, E. Custodio, M. Manzano), 465-480. ... Enter the email address you signed up... more
Groundwater and saline intrusion. Selected papers from the 18th Salt Water Intrusion Meeting. Cartagena, Spain. Publ. Geological Survey of Spain (ed. L. Araguas, E. Custodio, M. Manzano), 465-480. ... Enter the email address you signed up with, and we'll send an ...
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The provision of water has been a major enterprise in human history. Groundwater was one of the first sources since the prehistoric times to cover human needs. Initially, the exploitation of groundwater has been made by shallow wells and... more
The provision of water has been a major enterprise in human history. Groundwater was one of the first sources since the prehistoric times to cover human needs. Initially, the exploitation of groundwater has been made by shallow wells and later by boreholes. A water well is constructed through excavation in the ground by digging, driving, boring, or drilling to access groundwater in aquifers. Groundwater wells were used in the Helladic world since Neolithic times. Ancient China developed a sophisticated tool for drilling water wells that is similar to modern machines. Qanat, a system of wells, originated in Iran (Persia), but was adopted by other countries. Moreover, the Indus valley civilization had well-constructed wells mainly for drinking purposes. The construction of wells varied according to local conditions, determined by geology, hydrogeology, and morphology, as well as by local tradition. Furthermore, a well was not just a water source but also became a cultural symbol throu...
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During the last decades, climate change impacts on hydrology have been assessed by coupling the Regional correction methods were developed to overcome this issue. In this paper, the delta change, the linear scaling, and the empirical... more
During the last decades, climate change impacts on hydrology have been assessed by coupling the Regional correction methods were developed to overcome this issue. In this paper, the delta change, the linear scaling, and the empirical quantile mapping were applied to climate input data to a semi distributed hydrological model. The Regional simulation was enhanced after the bias correction methods application. The discrepancies in simulated and observed precipitation, temperature).
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this research is to evaluate well-known spatial interpolation methods on hindcast precipitation Thiessen polygons spatial distribution methods are implemented into the climate model derivatives. The methodology is applied in a watershed... more
this research is to evaluate well-known spatial interpolation methods on hindcast precipitation Thiessen polygons spatial distribution methods are implemented into the climate model derivatives. The methodology is applied in a watershed in Northern Greece, with the outputs of the interpolation techniques to be compared against gauged precipitation records. The reliability of the spatial interpolation results is estimated by using statistic metrics and method, future precipitation could be properly distributed at basin scales and hydrological modelling grids. Hence, the improve the accuracy of the simulation of river discharges under
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The purpose of this study is to present a robust methodology that can provide an accurate and reliable estimation of the lateral mobility and vertical scour at the crossing points of a pipeline with rivers/torrents. A new protocol is... more
The purpose of this study is to present a robust methodology that can provide an accurate and reliable estimation of the lateral mobility and vertical scour at the crossing points of a pipeline with rivers/torrents. A new protocol is proposed, which includes detailed description of the different steps of a proper hydrologic and hydraulic study at the areas of the crossing points. The rate and extent of the lateral movement of a river channel is controlled by the river discharge and the sediment load for a specific forecasting time period. The assessment of the lateral movement is based on field observations and analysis of Google Earth and satellite images. In order to assess the lateral mobility risk, a rating method was developed, which takes into account the following factors: Sediment load, Riparian vegetation, Type of Channel, Flow velocity and discharge, Civil works and Floodplain. Scour (vertical erosion) is the removal of material from the bed and banks of a channel, due to the physical action of flowing water, as well as to human activities. The total vertical scour depends on hydrological and geomorphological procedures, civil works, (constriction scour) climate change and human intervention. The aforementioned parameters are specified in the proposed methodology. The general scour was estimated by using different empirical methodologies, e.g. Blench, Lacey and Alvarez-Alfaro, which are widely used, according to the scientific literature. Finally, two indicative case studies from North Greece are presented.
Chloride concentration and salinity tend to vary spatially in depth within the unsaturated zone, according to the local hydrologic conditions; and therefore are widely used as naturally occurring environmental tracers. In this study,... more
Chloride concentration and salinity tend to vary spatially in depth within the unsaturated zone, according to the local hydrologic conditions; and therefore are widely used as naturally occurring environmental tracers. In this study, undisturbed material from the unsaturated zone was collected at regular intervals of 50 cm down to a maximum depth of 300 cm in 17 different locations. Vacuum filtration has been used for extraction of soil water from 75 soil samples, and chemical analyses showed that the chloride concentrations in soils range from 0.4 to 79 meq/L indicating the existence of soluble salts, also verified by elevated electrical conductivity values.
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ABSRACT: The provision of water has been a major enterprise in human history. Groundwater has been utilized since the Prehistoric times to cover the human needs. Initially, the exploitation of groundwater has been made by shallow wells... more
ABSRACT: The provision of water has been a major enterprise in human history. Groundwater has been utilized since the Prehistoric times to cover the human needs. Initially, the exploitation of groundwater has been made by shallow wells and later by boreholes. A water well is an excavation in the ground by digging, driving, boring, or drilling to access groundwater in aquifers. Groundwater wells were used in Helladic world since Neolithic times. Ancient Chinese also developed a drilling tool for water wells which, in principle, is similar to modern machines. Moreover, the Indus valley civilization had well-constructed wells mainly for drinking purposes. The construction of wells varied according to local conditions, determined by geology, hydrogeology, morphology, as well as to the local tradition. Furthermore, a well was not just a water source but also became a cultural symbol on the history, related to local religion and custom. For example, the stepwells in India became not only sources of drinking water, but cool sanctuaries for bathing, prayer, and meditation. In the present review the evolution of wells through the centuries is examined. The examples of water wells technologies demonstrate that the ancient people had an outstanding engineering knowledge of water supply, which is interesting for water engineering and hydrogeologists even nowadays.