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In this paper, the development of the conceptual and groundwater flow model for the coastal aquifer system of the alluvial plain of River Nestos (N. Greece), that suffers from seawater intrusion due to over-pumping for irrigation, is analyzed. The study area is a typical semi-arid hydrogeologic environment, composed of a multi-layer granular aquifers that covers the eastern coastal delta system of R. Nestos. This study demonstrates the results of a series of field measurements (such as geophysical surveys, hydrochemical and isotopical measurements, hydro-meteorological data, land use, irrigation schemes) that were conducted during the period 2009 to 2014. The synthesis of the above resulted in the development of the conceptual model for this aquifer system, that formed the basis for the application of the mathematical model for simulating groundwater flow. The mathematical modeling was achieved using the finite difference method after the application of the USGS code MODFLOW-2005.
Ioannis Gkiougkis; Christos Pouliaris; Fotios-Konstantinos Pliakas; Ioannis Diamantis; Andreas Kallioras. Conceptual and Mathematical Modeling of a Coastal Aquifer in Eastern Delta of R. Nestos (N. Greece). Hydrology 2021, 8, 23 .
AMA StyleIoannis Gkiougkis, Christos Pouliaris, Fotios-Konstantinos Pliakas, Ioannis Diamantis, Andreas Kallioras. Conceptual and Mathematical Modeling of a Coastal Aquifer in Eastern Delta of R. Nestos (N. Greece). Hydrology. 2021; 8 (1):23.
Chicago/Turabian StyleIoannis Gkiougkis; Christos Pouliaris; Fotios-Konstantinos Pliakas; Ioannis Diamantis; Andreas Kallioras. 2021. "Conceptual and Mathematical Modeling of a Coastal Aquifer in Eastern Delta of R. Nestos (N. Greece)." Hydrology 8, no. 1: 23.
The views and perceptions of the civil protection community have a central position in any risk management process or initiative, and are crucial to its success. However, knowledge of the views and perceptions of officials, and what affects them remains limited in the current literature. This work uses questionnaires to explore the views of civil protection personnel in Greece on different elements of flood risk management and identify factors that influence them. Results provide a basic understanding of officials’ views, indicating certain shortcomings in various sectors and dissatisfaction in several aspects of everyday practice. Interestingly, responses of participants to perception- and knowledge-related questions show a pattern, relating to respondents’ attributes and characteristics, such as experience, age, qualifications, and others. On the contrary, their views on everyday practice issues of flood risk management are associated with the type of position they have in the civil protection community. The findings contribute to the overall effort to improve the understanding of the characteristics of civil protection organizations across Europe, as a means to enhance cooperation.
Michalis Diakakis; Dimitris Damigos; Andreas Kallioras. Identification of Patterns and Influential Factors on Civil Protection Personnel Opinions and Views on Different Aspects of Flood Risk Management: The Case of Greece. Sustainability 2020, 12, 5585 .
AMA StyleMichalis Diakakis, Dimitris Damigos, Andreas Kallioras. Identification of Patterns and Influential Factors on Civil Protection Personnel Opinions and Views on Different Aspects of Flood Risk Management: The Case of Greece. Sustainability. 2020; 12 (14):5585.
Chicago/Turabian StyleMichalis Diakakis; Dimitris Damigos; Andreas Kallioras. 2020. "Identification of Patterns and Influential Factors on Civil Protection Personnel Opinions and Views on Different Aspects of Flood Risk Management: The Case of Greece." Sustainability 12, no. 14: 5585.
This paper demonstrates the application of a recently developed free and open-source GIS-integrated hydrochemical–hydrogeological analysis tool (named AkvaGIS) for the management and interpretation of hydrogeological data with respect to a coastal aquifer system. The aforementioned tool is composed of a geospatial database implemented in Spatialite, complemented with a set of developed tools for the analysis, interpretation, and visualization of groundwater quality parameters and hydrogeological data. This ICT tool is part of the FREEWAT platform, an open-source and public domain GIS-integrated modelling environment based on groundwater flow and solute transport numerical models, including a water management and planning module. The case study that was used to perform a demonstration of the aforementioned tool, is a coastal aquifer system in Greece, suffering from both seawater intrusion and nitrate contamination as a result of extensive agricultural activities. It involves a complex hydrogeological environment incorporating karst and granular aquifer layers, subjected to different exploitation conditions. AkvaGIS was proved a useful ICT tool for the analysis and interpretation of the collected hydrogeological/hydrochemical data and results, which may be considered as a valuable tool for analyzing different aspects of aquifer systems.
M. Perdikaki; R. Criollo Manjarrez; C. Pouliaris; R. Rossetto; A. Kallioras. Free and open-source GIS-integrated hydrogeological analysis tool: an application for coastal aquifer systems. Environmental Earth Sciences 2020, 79, 1 -16.
AMA StyleM. Perdikaki, R. Criollo Manjarrez, C. Pouliaris, R. Rossetto, A. Kallioras. Free and open-source GIS-integrated hydrogeological analysis tool: an application for coastal aquifer systems. Environmental Earth Sciences. 2020; 79 (14):1-16.
Chicago/Turabian StyleM. Perdikaki; R. Criollo Manjarrez; C. Pouliaris; R. Rossetto; A. Kallioras. 2020. "Free and open-source GIS-integrated hydrogeological analysis tool: an application for coastal aquifer systems." Environmental Earth Sciences 79, no. 14: 1-16.
Groundwater is a limited resource in coastal hydrogeological systems, especially in semi-arid environments where the irrigation demands are very high. Management of such hydrosystems is a very challenging process; while water conflict between different users as well as climate change conditions are magnifying this problem.
Managed aquifer recharge – storing water in aquifers during times of excess – is considered as a sound engineering technique and a key strategy to support groundwater resources in such hydrologically sensitive regions by providing intermediate storage, bridging the gap between water demand and availability. In addition to the above, innovative modelling techniques that apply participatory approaches can be proved a valuable supporting tool for the management of groundwater resources within an optimized manner.
The coastal field of Argolis (S. Greece) is used as a reference site to illustrate the above, where Managed Aquifer Recharge is applied on a full-scale mode since 1990, using karst groundwater as a recharge water source. The study area involves an extended and complex water infrastructure systems that includes: (a) a main intake structure -a submarine dam exploiting a system of submarine karstic springs-; (b) a conveyance system -mainly open canal structures- that assures the transport of water from the main intake structure and main pumping station up to the agricultural area; and (c) a cluster of Managed Aquifer Recharge facilities that divert water towards the subsurface either through deep groundwater wells or infiltration ponds at selected parts of the aquifer.
This research presents the results of hydro‐environmental modelling activities of Managed Aquifer Recharge and the preliminary work on participatory driven water resources modelling scenarios. This study is envisaged to contribute in the identification and valuation of socio‐economic and environmental processes and linkages of groundwater uses and services.
Andreas Kallioras; Efthymios Chrysanthopoulos; Anastasios Mitropapas; Epaminondas Floros; Sofia Nalbadi; Paraskevi Seferou; Christos Pouliaris; Konstantinos Markantonis. Water resources management of coastal semi-arid environments using Managed Aquifer Recharge and participatory modelling approaches. 2020, 1 .
AMA StyleAndreas Kallioras, Efthymios Chrysanthopoulos, Anastasios Mitropapas, Epaminondas Floros, Sofia Nalbadi, Paraskevi Seferou, Christos Pouliaris, Konstantinos Markantonis. Water resources management of coastal semi-arid environments using Managed Aquifer Recharge and participatory modelling approaches. . 2020; ():1.
Chicago/Turabian StyleAndreas Kallioras; Efthymios Chrysanthopoulos; Anastasios Mitropapas; Epaminondas Floros; Sofia Nalbadi; Paraskevi Seferou; Christos Pouliaris; Konstantinos Markantonis. 2020. "Water resources management of coastal semi-arid environments using Managed Aquifer Recharge and participatory modelling approaches." , no. : 1.
Because of the spatial nature of groundwater-related data and their time component, effective groundwater management requires the application of methods pertaining to the Information and Communication Technologies sector, such as spatial data management and distributed numerical modelling. The objective of this paper is to demonstrate the effectiveness of the QGIS-integrated FREEWAT platform and an approach combining spatial data management and numerical models to target groundwater management issues. FREEWAT is a free and open source platform integrated in a Geographic Information System environment and embedding tools for pre- and post-processing of spatial data and integrating numerical codes for the simulation of the hydrological cycle, with a main focus on groundwater. To this aim, this paper briefly presents the FREEWAT platform, introduces the FREEWAT approach, and showcases 13 case studies in European and non-European countries where the FREEWAT platform was applied. Application of the FREEWAT platform to real-world case studies is presented for targeting management of coastal aquifers, ground- and surface-water interaction, climate change impacts, management of transboundary aquifers, rural water management and protection of groundwater-dependent ecosystems. In this sense, compared to other existing software suites, FREEWAT allows data analysis and visualization to accomplish each step of the modelling workflow, i.e., from data analytics, to conceptual model definition, to numerical modelling and reporting of results. The presented experiences demonstrate that improved access to data and the portability of models and models’ results can help to promote water sustainability from the local- to the basin-scale. Furthermore, FREEWAT may represent a valuable tool to target the objective of increasing the capabilities of public authorities and private companies to manage groundwater resources by means of up-to-date, robust, well-documented and reliable software, without entailing the need of costly licensing, nowadays seldom affordable by public water authorities. Based on the strengths highlighted, the FREEWAT platform is a powerful tool for groundwater resources management, and for data collection, sharing, implementation and comparison of scenarios, for supporting planning and decision-making.
Giovanna De Filippis; Christos Pouliaris; Daniel Kahuda; Teodora Alexandra Vasile; Valentina Adriana Manea; Florian Zaun; Björn Panteleit; Filiz Dadaser-Celik; Pio Positano; Marco Saulo Nannucci; Mykhailo Grodzynskyi; Andres Marandi; Manuel Sapiano; Irena Kopač; Andreas Kallioras; Massimiliano Cannata; Youssef Filiali-Meknassi; Laura Foglia; Iacopo Borsi; Rudy Rossetto. Spatial Data Management and Numerical Modelling: Demonstrating the Application of the QGIS-Integrated FREEWAT Platform at 13 Case Studies for Tackling Groundwater Resource Management. Water 2019, 12, 41 .
AMA StyleGiovanna De Filippis, Christos Pouliaris, Daniel Kahuda, Teodora Alexandra Vasile, Valentina Adriana Manea, Florian Zaun, Björn Panteleit, Filiz Dadaser-Celik, Pio Positano, Marco Saulo Nannucci, Mykhailo Grodzynskyi, Andres Marandi, Manuel Sapiano, Irena Kopač, Andreas Kallioras, Massimiliano Cannata, Youssef Filiali-Meknassi, Laura Foglia, Iacopo Borsi, Rudy Rossetto. Spatial Data Management and Numerical Modelling: Demonstrating the Application of the QGIS-Integrated FREEWAT Platform at 13 Case Studies for Tackling Groundwater Resource Management. Water. 2019; 12 (1):41.
Chicago/Turabian StyleGiovanna De Filippis; Christos Pouliaris; Daniel Kahuda; Teodora Alexandra Vasile; Valentina Adriana Manea; Florian Zaun; Björn Panteleit; Filiz Dadaser-Celik; Pio Positano; Marco Saulo Nannucci; Mykhailo Grodzynskyi; Andres Marandi; Manuel Sapiano; Irena Kopač; Andreas Kallioras; Massimiliano Cannata; Youssef Filiali-Meknassi; Laura Foglia; Iacopo Borsi; Rudy Rossetto. 2019. "Spatial Data Management and Numerical Modelling: Demonstrating the Application of the QGIS-Integrated FREEWAT Platform at 13 Case Studies for Tackling Groundwater Resource Management." Water 12, no. 1: 41.
Advanced sensing technologies, combined with wireless sensor networks, have already demonstrated their value in monitoring urban water systems, where management is rather centralized within water utility organizations. Environmental water resources, characterized by more diverse stakeholders and overlapping management responsibilities of different agencies, present more challenging contexts for implementing novel sensing technologies. Crowdsourcing by citizens has been proposed as an alternative approach for adaptive data collection that can augment the amount of data collected, as well as bring together the diverse stakeholders and citizens in more participatory water resources management processes. This article first introduces the challenges of designing citizens’ campaigns for collecting data on environmental waters. A set of developed mobile phone and web applications is then introduced, integrated within a specific platform, as it was used in the execution of citizens’ campaigns for data needed in flood analysis and management. Experiences and lessons learned are presented from the field execution of citizens’ campaigns in two pilot areas located in Europe - the Danube Delta in Romania, and the Kifissos catchment in Greece. Two of the campaigns are on river data collection – water levels and water velocities, and two on collecting land use/land cover data. Surveys carried out with campaign participants indicate their appreciation of the initiative, but challenges remain regarding user-friendliness of the applications. Logistic issues such as timing, duration, and pathways for data collection impacted the motivation of participants. Overall, a unique and large dataset was obtained in terms of quantitative water measurements, despite data losses due to low raw data quality. Further work lies in evaluating the usability of this dataset for local authorities.
Thaine H. Assumpcao; Andreja Jonoski; Iouliani Theona; Chrysovalantis Tsiakos; Maria Krommyda; Stefano Tamascelli; Andreas Kallioras; Marian Mierla; Harris V. Georgiou; Maria Miska; Christos Pouliaris; Cristian Trifanov; Kinga Timea Cimpan; Athanasia Tsertou; Eugenia Marin; Michalis Diakakis; Iulian Nichersu; Angelos J. Amditis; Ioana Popescu. Citizens’ Campaigns for Environmental Water Monitoring: Lessons From Field Experiments. IEEE Access 2019, 7, 134601 -134620.
AMA StyleThaine H. Assumpcao, Andreja Jonoski, Iouliani Theona, Chrysovalantis Tsiakos, Maria Krommyda, Stefano Tamascelli, Andreas Kallioras, Marian Mierla, Harris V. Georgiou, Maria Miska, Christos Pouliaris, Cristian Trifanov, Kinga Timea Cimpan, Athanasia Tsertou, Eugenia Marin, Michalis Diakakis, Iulian Nichersu, Angelos J. Amditis, Ioana Popescu. Citizens’ Campaigns for Environmental Water Monitoring: Lessons From Field Experiments. IEEE Access. 2019; 7 (99):134601-134620.
Chicago/Turabian StyleThaine H. Assumpcao; Andreja Jonoski; Iouliani Theona; Chrysovalantis Tsiakos; Maria Krommyda; Stefano Tamascelli; Andreas Kallioras; Marian Mierla; Harris V. Georgiou; Maria Miska; Christos Pouliaris; Cristian Trifanov; Kinga Timea Cimpan; Athanasia Tsertou; Eugenia Marin; Michalis Diakakis; Iulian Nichersu; Angelos J. Amditis; Ioana Popescu. 2019. "Citizens’ Campaigns for Environmental Water Monitoring: Lessons From Field Experiments." IEEE Access 7, no. 99: 134601-134620.
FREEWAT is a free and open source QGIS-integrated platform, developed to simulate several hydrological processes by combining the capabilities of geographic information system (GIS) for geo-processing and post-processing tools with several codes of the well-known USGS MODFLOW ‘family’. FREEWAT platform was applied for the groundwater flow simulation of a coastal aquifer system, located in northern Greece. The simulation was conducted using the MODFLOW_2005 code, the Observation Analysis Tool (a FREEWAT module facilitating the integration of time series observations into modeling), while the UCODE_2014 code was used as the main module for the sensitivity analysis and parameter estimation. The statistics used include composite scaled sensitivities, parameter correlation coefficients, and leverage. The simulation of the investigated aquifer system was found to be satisfactory, indicating that the simulated level values were slightly greater than the observed values after the optimization.
Evgenia Koltsida; Andreas Kallioras. Groundwater flow simulation through the application of the FREEWAT modeling platform. Journal of Hydroinformatics 2019, 21, 812 -833.
AMA StyleEvgenia Koltsida, Andreas Kallioras. Groundwater flow simulation through the application of the FREEWAT modeling platform. Journal of Hydroinformatics. 2019; 21 (5):812-833.
Chicago/Turabian StyleEvgenia Koltsida; Andreas Kallioras. 2019. "Groundwater flow simulation through the application of the FREEWAT modeling platform." Journal of Hydroinformatics 21, no. 5: 812-833.
The management of groundwater resources in coastal environments within the Mediterranean basin has become of paramount importance, especially in the light of global changes. A typical example of such a hydrosystem is the Lavrio basin in Greece. This research site involves two aquifer types—granular and karstic formations—that are hydraulically interconnected. Furthermore, the proximity to the sea and the abstractions for irrigation and drinking water supply have led to the phenomenon of seawater intrusion. The present study aims at analyzing the hydraulic, hydrological, and hydrogeological conditions of the area by means of hydrochemical and isotopical data interpretation as supporting tools, which will inform and support the development of an integrated conceptual hydrogeological model of the area. Field investigations were conducted in order to collect piezometric and chemical data and use them to retrieve the quantitative and qualitative status of the local aquifer units. New interpretation of an older dataset gave an insight into how the karstic aquifer behaves in terms of hydraulics. The results have also demonstrated that there is a hydraulic connection between the different aquifers and the Mediterranean Sea, while natural recharge was quantified for both aquifer types.
Christos Pouliaris; Martha Perdikaki; Laura Foglia; Christoph Schüth; Andreas Kallioras. Hydrodynamic analysis of a Mediterranean aquifer system with the use of hydrochemical and isotopical analysis as supporting tools. Environmental Earth Sciences 2018, 77, 237 .
AMA StyleChristos Pouliaris, Martha Perdikaki, Laura Foglia, Christoph Schüth, Andreas Kallioras. Hydrodynamic analysis of a Mediterranean aquifer system with the use of hydrochemical and isotopical analysis as supporting tools. Environmental Earth Sciences. 2018; 77 (6):237.
Chicago/Turabian StyleChristos Pouliaris; Martha Perdikaki; Laura Foglia; Christoph Schüth; Andreas Kallioras. 2018. "Hydrodynamic analysis of a Mediterranean aquifer system with the use of hydrochemical and isotopical analysis as supporting tools." Environmental Earth Sciences 77, no. 6: 237.
Un-managed surface and groundwater exploitation in coastal areas usually leads to deterioration of such sensitive ecosystems by means of water resources degradation and/or increased salinity. The coastal partof Marathon is a typical Mediterranean hydro-environment that hosts a naturally occurring coastal wetland linked to a typical coastal and today degraded hydrogeological system of a semi-arid region. A smart engineered Subsurface-Water-Solution (SWS)system composed ofan optimised Pump & Treat componentintegrated with an Aquifer Storage and Recovery (ASR) scheme in this area is envisagedcontribute to the remediationof the groundwater system and the wetland.
Martha Perdikaki; Andreas Kallioras; Klio Monokrousou; Christoforos Christoforidis; Dimitris Iossifidis; Eri Bizani; Anastasios Zafeiropoulos; Klisthenis Dimitriadis; Klaasjan Raat; Gerard Van Den Berg; Christos Makropoulos. Integrated Subsurface Water Solutions for Coastal Wetland Restoration through Integrated Pump&Treat and Aquifer Storage and Recovery (ASR). Proceedings 2018, 2, 665 .
AMA StyleMartha Perdikaki, Andreas Kallioras, Klio Monokrousou, Christoforos Christoforidis, Dimitris Iossifidis, Eri Bizani, Anastasios Zafeiropoulos, Klisthenis Dimitriadis, Klaasjan Raat, Gerard Van Den Berg, Christos Makropoulos. Integrated Subsurface Water Solutions for Coastal Wetland Restoration through Integrated Pump&Treat and Aquifer Storage and Recovery (ASR). Proceedings. 2018; 2 (11):665.
Chicago/Turabian StyleMartha Perdikaki; Andreas Kallioras; Klio Monokrousou; Christoforos Christoforidis; Dimitris Iossifidis; Eri Bizani; Anastasios Zafeiropoulos; Klisthenis Dimitriadis; Klaasjan Raat; Gerard Van Den Berg; Christos Makropoulos. 2018. "Integrated Subsurface Water Solutions for Coastal Wetland Restoration through Integrated Pump&Treat and Aquifer Storage and Recovery (ASR)." Proceedings 2, no. 11: 665.
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.
Efthymia Zavridou; Konstantinos Markantonis; Ioannis Argyrokastritis; Konstantinos Voudouris; Andreas Kallioras. Preliminary Results from Unsaturated Zone Studies in Unconfined Unconsolidated Coastal Aquifers. Proceedings 2018, 2, 642 .
AMA StyleEfthymia Zavridou, Konstantinos Markantonis, Ioannis Argyrokastritis, Konstantinos Voudouris, Andreas Kallioras. Preliminary Results from Unsaturated Zone Studies in Unconfined Unconsolidated Coastal Aquifers. Proceedings. 2018; 2 (11):642.
Chicago/Turabian StyleEfthymia Zavridou; Konstantinos Markantonis; Ioannis Argyrokastritis; Konstantinos Voudouris; Andreas Kallioras. 2018. "Preliminary Results from Unsaturated Zone Studies in Unconfined Unconsolidated Coastal Aquifers." Proceedings 2, no. 11: 642.
Managed Aquifer Recharge is a wide-spread well-established groundwater engineering method which is largely seen as sound and sustainable solution to water scarcity hydrologically sensitive areas, such as the Circum Mediterranean. The process of site selection for the installation of a MAR facility is of paramount importance for the feasibility and effectiveness of the project itself, especially when the facility will include the use of waters of impaired quality as a recharge source, as in the case of Soil-Aquifer-Treatment systems. The main objective of this study is to present the developed framework of a multi-criteria Decision Support System (DSS) that integrates within a dynamic platform the main groundwater engineering parameters associated with MAR applications together with the general geographical features which determine the effectiveness of such a project. The proposed system will provide an advanced coupled DSS-GIS tool capable of handling local MAR-related issues -such as hydrogeology, topography, soil, climate etc., and spatially distributed variables -such as societal, economic, administrative, legislative etc., with special reference to Soil-Aquifer-Treatment technologies.
P. Tsangaratos; A. Kallioras; Th. Pizpikis; E. Vasileiou; I. Ilia; F. Pliakas. Multi-criteria Decision Support System (DSS) for optimal locations of Soil Aquifer Treatment (SAT) facilities. Science of The Total Environment 2017, 603-604, 472 -486.
AMA StyleP. Tsangaratos, A. Kallioras, Th. Pizpikis, E. Vasileiou, I. Ilia, F. Pliakas. Multi-criteria Decision Support System (DSS) for optimal locations of Soil Aquifer Treatment (SAT) facilities. Science of The Total Environment. 2017; 603-604 ():472-486.
Chicago/Turabian StyleP. Tsangaratos; A. Kallioras; Th. Pizpikis; E. Vasileiou; I. Ilia; F. Pliakas. 2017. "Multi-criteria Decision Support System (DSS) for optimal locations of Soil Aquifer Treatment (SAT) facilities." Science of The Total Environment 603-604, no. : 472-486.
Groundwater resources assessment has resulted in development of models that help identify the vulnerable zones. This paper presents a GIS-based hydrogeological index, named GALDIT, aiming at the assessment of aquifer vulnerability to seawater intrusion in Atalanti coastal aquifer, Central-Eastern Greece. The above acronym is formed from the most important factors controlling seawater intrusion, that is, four intrinsic hydrogeological parameters, one spatial parameter and one boundary parameter including Groundwater occurrence (aquifer type), Aquifer hydraulic conductivity, depth to groundwater Level above the sea (hydraulic head), Distance from the shore, Impact of seawater intrusion and aquifer’s Thickness. These factors nclude the basic requirements needed to assess the general salinization potential of each hydrogeological setting. Each parameter is evaluated with respect to the other to determine the relative importance of each factor. GALDIT model is described to assess and quantify the significance of vulnerability to seawater intrusion due to excessive groundwater withdrawals. Different thematic maps are prepared for seawater intrusion indicators and overlaid to develop the final vulnerability map. The derived map can be used as a tool for coastal groundwater resources management and areas’ determination of potential saltwater intrusion since the result of GALDIT ndex is classified based on vulnerability rate.
I. Lappas; A. Kallioras; F. Pliakas; Th. Rondogianni. GROUNDWATER VULNERABILITY ASSESSMENT TO SEAWATER INTRUSION THROUGH GIS - BASED GALDIT METHOD. CASE STUDY: ATALANTI COASTAL AQUIFER, CENTRAL GREECE. Bulletin of the Geological Society of Greece 2017, 50, 798 .
AMA StyleI. Lappas, A. Kallioras, F. Pliakas, Th. Rondogianni. GROUNDWATER VULNERABILITY ASSESSMENT TO SEAWATER INTRUSION THROUGH GIS - BASED GALDIT METHOD. CASE STUDY: ATALANTI COASTAL AQUIFER, CENTRAL GREECE. Bulletin of the Geological Society of Greece. 2017; 50 (2):798.
Chicago/Turabian StyleI. Lappas; A. Kallioras; F. Pliakas; Th. Rondogianni. 2017. "GROUNDWATER VULNERABILITY ASSESSMENT TO SEAWATER INTRUSION THROUGH GIS - BASED GALDIT METHOD. CASE STUDY: ATALANTI COASTAL AQUIFER, CENTRAL GREECE." Bulletin of the Geological Society of Greece 50, no. 2: 798.
Sound groundwater resources management is a matter of paramount importance in Circum-Mediterranean, for the ecologic status of the underlying aquifer systems. Freshwater resources in Greece are identified within all types of aquifer formations, however two distinct types are the ones that draw the attention of the scientific and the engineering community; the granular as well as the karst aquifers. This paper describes the groundwater resources potential that are found within granular aquifer formations, in combination with the major environmental threats associated with their exploitation and management.
A. Kallioras; F. Pliakas; P. Marinos. GROUNDWATER RESOURCES ASSESSMENT OF GRANULAR AQUIFERS IN GREECE. Bulletin of the Geological Society of Greece 2017, 50, 701 .
AMA StyleA. Kallioras, F. Pliakas, P. Marinos. GROUNDWATER RESOURCES ASSESSMENT OF GRANULAR AQUIFERS IN GREECE. Bulletin of the Geological Society of Greece. 2017; 50 (2):701.
Chicago/Turabian StyleA. Kallioras; F. Pliakas; P. Marinos. 2017. "GROUNDWATER RESOURCES ASSESSMENT OF GRANULAR AQUIFERS IN GREECE." Bulletin of the Geological Society of Greece 50, no. 2: 701.
Citizen participation in the environmental policy making process is a new concept still in development, however there is a growing interest in it. Present paper presents the newly funded H2020 EU project SCENT, which aims to use smart collaborative technologies, to enable citizens to become the 'eyes' of the authorities and policy makers and to monitor land-cover/use changes through everyday activities. In particular, SCENT will design and implement a toolbox of innovative technologies to improve current maps and make flooding prediction models more accurate. Such technologies include low-cost and portable sensors, an innovative crowd sourcing platform, serious gaming applications for large-scale image collection, machine learning for image and text classification, numerical models for mapping land-cover changes to quantifiable impact on flood risks and a harmonization platform, consolidating data and adding it to Global Earth Observation System of Systems (GEOSS).
A. Tserstou; A. Jonoski; I. Popescu; T. Herman Asumpcao; G. Athanasiou; Andreas Kallioras; I. Nichersu. SCENT: Citizen Sourced Data in Support of Environmental Monitoring. 2017 21st International Conference on Control Systems and Computer Science (CSCS) 2017, 612 -616.
AMA StyleA. Tserstou, A. Jonoski, I. Popescu, T. Herman Asumpcao, G. Athanasiou, Andreas Kallioras, I. Nichersu. SCENT: Citizen Sourced Data in Support of Environmental Monitoring. 2017 21st International Conference on Control Systems and Computer Science (CSCS). 2017; ():612-616.
Chicago/Turabian StyleA. Tserstou; A. Jonoski; I. Popescu; T. Herman Asumpcao; G. Athanasiou; Andreas Kallioras; I. Nichersu. 2017. "SCENT: Citizen Sourced Data in Support of Environmental Monitoring." 2017 21st International Conference on Control Systems and Computer Science (CSCS) , no. : 612-616.
This paper deals with the hydrogeological study of the evolution of groundwater salinisation - degradation at the eastern Nestos River Delta. Relevant field works including in-situ measurements of groundwater level, pH, Specific Electrical Conductivity (SEC) and temperature took place in the years 2008 and 2009. Groundwater samples were also collected for chemical analysis at the Engineering Geology Laboratory of the Department of Civil Engineering of D.U.Th. (July of 2009). Important conclusions regarding the progress of the groundwater degradation at the study area were drawn based on the analysis of all the available data and the elaboration of the designed piezometric maps and the various maps showing the distribution of SEC, Chloride, SAR (Sodium Absorption Ratio) and Revelle coefficient values. Some managerial suggestions for the confrontation of the seawater intrusion regime of the study area are also included.
I. Gkiougkis; G. Mwila; F. Pliakas; A. Kallioras; I. Diamantis. HYDROGEOLOGICAL ASSESSMENT OF GROUNDWATER DEGRADATION AT THE EASTERN NESTOS RIVER DELTA, N.E. GREECE. Bulletin of the Geological Society of Greece 2017, 43, 1697 -1706.
AMA StyleI. Gkiougkis, G. Mwila, F. Pliakas, A. Kallioras, I. Diamantis. HYDROGEOLOGICAL ASSESSMENT OF GROUNDWATER DEGRADATION AT THE EASTERN NESTOS RIVER DELTA, N.E. GREECE. Bulletin of the Geological Society of Greece. 2017; 43 (4):1697-1706.
Chicago/Turabian StyleI. Gkiougkis; G. Mwila; F. Pliakas; A. Kallioras; I. Diamantis. 2017. "HYDROGEOLOGICAL ASSESSMENT OF GROUNDWATER DEGRADATION AT THE EASTERN NESTOS RIVER DELTA, N.E. GREECE." Bulletin of the Geological Society of Greece 43, no. 4: 1697-1706.
Managed Aquifer Recharge is a wide-spread well-established groundwater engineering method which is largely seen as an alternative potential major source for water and this conclusion becomes even more pronounced in semi-arid and/or arid areas, such as the Mediterranean Basin. The process of site selection for the installation of a MAR facility is of paramount importance for the feasibility and effectiveness of the project itself, especially when the facility will include the use of waters of impaired quality as a recharge source. The main objective of this study is to present the developed framework of a multicriteria Decision Support System (DSS) that integrates within a dynamic platform: the main groundwater engineering parameters associated with MAR applications together with the general geographical features which determine the effectiveness of such a project. The proposed system will provide an advanced coupled DSS-GIS tool capable of handling local MAR-related issues -such as hydrogeology, topography, soil, climate etc., and spatially distributed variables -such as societal, economic, administrative, legislative etc., with special reference to Soil-Aquifer- Treatment technologies. The new SAT-selection tool in question is integrated in ArcGIS software -within a user friendly environment- where data can be processed and displayed using Arc tools for spatial analysis.
P. Tsangaratos; T. Pizpikis; E. Vasileiou; F. Pliakas; C. Schuth; A. Kallioras. Development of multi-criteria decision support system (DSS) coupled with GIS for identifying optimal locations for soil aquifer treatment (SAT) facilities. Bulletin of the Geological Society of Greece 2017, 47, 789 .
AMA StyleP. Tsangaratos, T. Pizpikis, E. Vasileiou, F. Pliakas, C. Schuth, A. Kallioras. Development of multi-criteria decision support system (DSS) coupled with GIS for identifying optimal locations for soil aquifer treatment (SAT) facilities. Bulletin of the Geological Society of Greece. 2017; 47 (2):789.
Chicago/Turabian StyleP. Tsangaratos; T. Pizpikis; E. Vasileiou; F. Pliakas; C. Schuth; A. Kallioras. 2017. "Development of multi-criteria decision support system (DSS) coupled with GIS for identifying optimal locations for soil aquifer treatment (SAT) facilities." Bulletin of the Geological Society of Greece 47, no. 2: 789.
R. Rausch; C. Schüth; Α. Kallioras. GROUNDWATER RESOURCES MANAGEMENT IN ARID COUNTRIES. Bulletin of the Geological Society of Greece 2017, 43, 69 .
AMA StyleR. Rausch, C. Schüth, Α. Kallioras. GROUNDWATER RESOURCES MANAGEMENT IN ARID COUNTRIES. Bulletin of the Geological Society of Greece. 2017; 43 (1):69.
Chicago/Turabian StyleR. Rausch; C. Schüth; Α. Kallioras. 2017. "GROUNDWATER RESOURCES MANAGEMENT IN ARID COUNTRIES." Bulletin of the Geological Society of Greece 43, no. 1: 69.
Precise measurements of the downward movement of precipitation through the unsaturated zone, as well as return flow of moisture to the atmosphere via evaporation, have always been challenging in regard to in-situ monitoring techniques. This study investigates the profile of volumetric water-content fluctuations within the unsaturated zone through a combination of field techniques, including in-situ measurements of the volumetric porewater content at different depths using specially designed time-domain reflectometry (TDR) probes. The probes are installed through direct-push vibro-coring methods, at significant depths within the unsaturated zone, providing continuous readings of the soil-moisture content throughout the unsaturated column. The measured waveform is analyzed by using the inverse modeling approach resulting in an apparent relative dielectric permittivity profile of the surrounding medium along the TDR probe length. The approach sufficiently analyzes the mechanisms of water fluxes through significant depths within the unsaturated zone, which in turn can be used to quantify groundwater recharge at areas where the unsaturated zone hydrology plays a key role in the recharge of the underlying aquifers (such as arid and hydrologically sensitive areas). The approach was applied at an experimental field site in the Upper Rhine Valley, Germany.La réalisation de mesures précises de l’infiltration de précipitations à travers la zone non saturée, de même que les flux de retour d’eau de l’humidité vers l’atmosphère par évaporation, a toujours constitué un véritable défi en matière de techniques de suivi in situ. Cette étude explore le profil des fluctuations de la teneur volumique en eau au sein de la zone non saturée, au travers de la combinaison de plusieurs techniques de terrain, avec notamment des mesures in-situ de la teneur volumique de l’eau interstitielle à différentes profondeurs en utilisant des sondes de réflectométrie dans le domaine du temps (TDR), spécialement conçues. Les sondes sont installées selon des méthodes de carottage assistées par vibration, à des profondeurs significatives dans la zone non saturée, permettant une lecture continue de la teneur de l’humidité du sol le long de la colonne non saturée. La forme d’onde mesurée est analysée en utilisant une approche de modélisation inverse qui se traduit par un profil de permittivité diélectrique relative apparente de l’environnement moyen le long de la sonde TDR. L’approche analyse de manière suffisante les mécanismes des flux d’eau jusqu’à des profondeurs significatives au sein de la zone non saturée, qui peuvent être utilisés pour quantifier la recharge des eaux souterraines dans des secteurs où l’hydrologie de la zone non saturée joue un rôle clef dans la recharge des aquifères sous-jacents (tels que les secteurs arides ou en situation hydrologique sensible). L’approche a été utilisée sur un site expérimental de la haute vallée du Rhin, en Allemagne.Las mediciones precisas del movimiento descendente de la precipitación a través de la zona no saturada, así como flujo de retorno de la humedad a la atmósfera a través de la evaporación, han sido siempre difíciles desafíos en relación a las técnicas de monitoreo in situ. Este estudio investiga el perfil de las fluctuaciones volumétricas del contenido de agua dentro de la zona no saturada a través de una combinación de técnicas de campo, incluyendo mediciones in situ del contenido volumétrico del agua poral a diferentes profundidades utilizando sondas de reflectometría especialmente diseñadas en el dominio del tiempo (TDR). Estas sondas se instalan a través de métodos de empuje directo o de extracción de sacatestigos, a profundidades significativas dentro de la zona no saturada, proporcionando lecturas continuas del contenido de humedad del suelo a través de la columna no saturada. La forma de onda medida se analizó utilizando el enfoque del modelado inverso que resultante en un perfil de permitividad aparente dieléctrica relativa del medio circundante a lo largo de la longitud de la sonda TDR. El enfoque analiza suficientemente los mecanismos de flujos de agua a través de las profundidades significativas dentro de la zona no saturada, lo cual a su vez puede ser utilizado para cuantificar la recarga de las aguas subterráneas en zonas donde la hidrología de la zona no saturada desempeña un papel clave en la recarga de los acuíferos subyacentes (tales como zonas áridas ó hidrológicamente sensibles). El enfoque se aplicó a un sitio de un campo experimental en el valle del Rin, Alemania.降水通过非饱和带向下运移以及水分通过蒸发回流的精确测量一直是现场测量技术上的挑战。通过综合野外技术,包括采用特别设计的时域反射计探头对不同深度的容积孔隙水进行现场测量,调查了非饱和带内容积水含量波动的剖面。通过直推式震动采芯法在非饱和带内的重点深度安装探头,提供整个非饱和土柱土壤水分含量的连续读数。利用反演模拟方法分析了测量的波形,得到沿整个时域反射计探头长度周围介质明显的相对介电常数剖面。该方法充分地分析了水通量通过非饱和带内重点深度的机理,反过来,机理可以用来对非饱和带水文条件在下伏含水层(如干旱和水文上敏感区)补给中发挥关键作用的地下水补给区进行量化。该方法应用于德国莱茵河谷上游的野外试验场。.Medições precisas do movimento descendente da precipitação através da zona não saturada, bem como o fluxo de retorno da umidade para atmosfera por meio da evaporação, sempre foram desafiadas em detrimento à técnicas de monitoramento in-situ. Este estudo investigou a flutuação do conteúdo volumétrico de água dentro do perfil da zona não saturada através da combinação de técnicas de campo,...
A. Kallioras; A. Khan; M. Piepenbrink; H. Pfletschinger; F. Koniger; Peter Dietrich; C. Schüth. Time-domain reflectometry probing systems for the monitoring of hydrological processes in the unsaturated zone. Hydrogeology Journal 2016, 24, 1297 -1309.
AMA StyleA. Kallioras, A. Khan, M. Piepenbrink, H. Pfletschinger, F. Koniger, Peter Dietrich, C. Schüth. Time-domain reflectometry probing systems for the monitoring of hydrological processes in the unsaturated zone. Hydrogeology Journal. 2016; 24 (5):1297-1309.
Chicago/Turabian StyleA. Kallioras; A. Khan; M. Piepenbrink; H. Pfletschinger; F. Koniger; Peter Dietrich; C. Schüth. 2016. "Time-domain reflectometry probing systems for the monitoring of hydrological processes in the unsaturated zone." Hydrogeology Journal 24, no. 5: 1297-1309.
In arid regions like the Arabian Peninsula, available water resources are essentially restricted to groundwater, requiring a detailed understanding of the local and regional hydrogeological conditions and water budgets. In the framework of the IWAS initiative, the 1.8 × 106 km2 large sedimentary Upper Mega Aquifer of the Arabian Peninsula was chosen as a model region to develop concepts and methodologies to quantify water fluxes in such an arid environment. Field and laboratory studies were conducted to analyse (i) precipitation patterns, (ii) groundwater recharge, (iii) the hydrochemical evolution of groundwater and (iv) evaporation particularly from Sabkhas in detail. Results were used as input parameters for a 3D groundwater model for the central part of the Peninsula, which was later extended to the full dimension of the Upper Mega Aquifer. It could be shown that in such a region different components of the water cycle have to be quantified with great care and several methods should be applied to reduce data uncertainty. It was not possible to make use out of satellite products to receive reliable actual precipitation patterns for the peninsula. It was observable; recharge estimations based on average annual precipitation are not applicable but should be based on singular precipitation events. A threshold of 6 mm/event was derived, below of which no recharge in sand seas occurs. The loss of water from UMA, due to sabkha evaporation reaches about 40 mm/a under the given recent climatic conditions.
Christian Siebert; Tino Rödiger; Stephan Schulz; Marcel Horovitz; Ralf Merz; Jan Friesen; Peter Dietrich; Nils Michelsen; Andreas Kallioras; Randolf Rausch; Irina Engelhardt; Mohammed Al-Saud; Christoph Schüth. New Tools for Coherent Information Base for IWRM in Arid Regions: The Upper Mega Aquifer System on the Arabian Peninsula. Integrated Water Resources Management: Concept, Research and Implementation 2016, 85 -106.
AMA StyleChristian Siebert, Tino Rödiger, Stephan Schulz, Marcel Horovitz, Ralf Merz, Jan Friesen, Peter Dietrich, Nils Michelsen, Andreas Kallioras, Randolf Rausch, Irina Engelhardt, Mohammed Al-Saud, Christoph Schüth. New Tools for Coherent Information Base for IWRM in Arid Regions: The Upper Mega Aquifer System on the Arabian Peninsula. Integrated Water Resources Management: Concept, Research and Implementation. 2016; ():85-106.
Chicago/Turabian StyleChristian Siebert; Tino Rödiger; Stephan Schulz; Marcel Horovitz; Ralf Merz; Jan Friesen; Peter Dietrich; Nils Michelsen; Andreas Kallioras; Randolf Rausch; Irina Engelhardt; Mohammed Al-Saud; Christoph Schüth. 2016. "New Tools for Coherent Information Base for IWRM in Arid Regions: The Upper Mega Aquifer System on the Arabian Peninsula." Integrated Water Resources Management: Concept, Research and Implementation , no. : 85-106.
A tailored geophysical investigation was designed to provide useful information in two of the activities/priorities of the Lavrion Technological and Cultural Park (LTCP): a) identification of optimal location for the construction of an advanced Soil-Aquifer-System (SAT) which will be used to monitor geo-purification processes within the unsaturated zone; b) detection and mapping of an old (abandoned) mining tunnel that is envisaged to serve the educational purposes of the LTCP. Electromagnetic measurements in a regional and local mode have given useful information as a reconnaissance method in the positioning of the best area for the first activity outlining mainly areas of problematic anthropogenic features. ERT method clarified in a great detail the underground features in order to better design the structures for the two activities/priorities of the LTCP.
G. Apostolopoulos; Andreas Kallioras; G. Amolochitis; G. Makris. Geophysical Investigation for Environmental and Geotechnical Projects in the Lavrion Technological and Cultural Park. 8th Congress of the Balkan Geophysical Society 2015, 1 .
AMA StyleG. Apostolopoulos, Andreas Kallioras, G. Amolochitis, G. Makris. Geophysical Investigation for Environmental and Geotechnical Projects in the Lavrion Technological and Cultural Park. 8th Congress of the Balkan Geophysical Society. 2015; ():1.
Chicago/Turabian StyleG. Apostolopoulos; Andreas Kallioras; G. Amolochitis; G. Makris. 2015. "Geophysical Investigation for Environmental and Geotechnical Projects in the Lavrion Technological and Cultural Park." 8th Congress of the Balkan Geophysical Society , no. : 1.