Papers by Andreas Kallioras
Environmental Earth Sciences
For the determination of groundwater recharge processes in arid environments, vadose zone water f... more For the determination of groundwater recharge processes in arid environments, vadose zone water fluxes and water storage should be considered. To better understand and quantify vadose zone processes influencing groundwater recharge, a soil column experimental setup has been developed that mimics arid atmospheric conditions and measures water and temperature fluxes in high temporal and spatial resolution. The focus of the experiment was on the determination of water infiltration, redistribution, evaporation and percolation under non-isothermal conditions. TDR rod sensors and a specific TDR “Taupe” cable sensor were used for water content measurements and allowed the infiltration fronts to be traced over the whole column length. Applying single irrigations of different amount and intensity showed the applicability of the experimental setup for the measurement of water movement in the unsaturated soil column.
Water Resources Management
PrefaceThe 5th Dubrovnik Conference on Sustainable Development of Energy, Water and Environment S... more PrefaceThe 5th Dubrovnik Conference on Sustainable Development of Energy, Water and Environment Systems (held in 2009) was attended by 307 scientists from 55 countries and 6 continents. The majority of the participants focused on methods, policies and technologies for increasing the sustainability of development, while always considering the economic, environmental and social aspects involved. With special reference to water science, the presented articles considered the link of both pillars of the conference (i.e. water and energy) all under the prism of environmental sustainability. The selected papers mainly discuss state-of-the-art water resources management issues which refer to applied international approaches and policies. Among others, they discuss water resources management issues in the framework of the European Water Framework Directive (WFD) 2000/60/EC, advanced technologies in the field of wastewater treatment (WWT) as well as engineering water works for water storage tech
SWOT analysis in groundwater resources management of coastal aquifers: a case study from Greece
Water International, 2010
This paper applies a SWOT (strengths, weaknesses, opportunities and threats) analysis to groundwa... more This paper applies a SWOT (strengths, weaknesses, opportunities and threats) analysis to groundwater resources management of a coastal aquifer in northern Greece typical of those subjected to seawater intrusion. SWOT analysis is found to be a useful managerial tool, incorporating interdisciplinary issues – engineering, scientific, legislative, economic and social – which are difficult to quantify, in order to identify the main environmental problem of the study area, which is overexploitation of the groundwater resources (and seawater intrusion as a consequence). Based on the main outcomes of the SWOT model, specific countermeasures are suggested in order to combat the over-pumping of the aquifer's resources which leads to overexploitation of the groundwater potential.
Simulation of Groundwater Flow in a Sedimentary Aquifer System Subjected to Overexploitation
Water Air and Soil Pollution, 2010
Groundwater flow models are applied to a large variety of hydrogeological conditions in different... more Groundwater flow models are applied to a large variety of hydrogeological conditions in different aquifer types, in order to simulate the groundwater flow of the investigated system. This paper aims to present the application of a groundwater flow model for the simulation of a sedimentary aquifer, located in Northern Greece. The simulation involves the period between April 2003 and April 2004, and the model is divided into two distinct stress periods, each containing two different time steps. The simulation of the aquifer is found to be satisfactory, conclusion which is based on both graphical as well as arithmetical verifications. The groundwater flow simulation was achieved by the application of the MODFLOW code.
The legislative framework and policy for the water resources management of transboundary rivers in Europe: the case of Nestos/Mesta River, between Greece and Bulgaria
Environmental Science & Policy, 2006
This paper describes the current legislative framework with respect to the management of transbou... more This paper describes the current legislative framework with respect to the management of transboundary river basins within the geographical area of Europe. It analyses the main aspects of the European Water Framework Directive as well as the important role of the United Nations Economic Commission for Europe (UN/ECE) on the management of international rivers. Finally, it presents the case study of the transboundary river Mesta/Nestos which flows through Bulgaria and Greece. It describes the cooperation of the two countries since 1964, when the negotiations started, and the current situation, whereas Bulgaria is a candidate Member State of the European Union and a new regime on the cooperation of the two countries will be developed.
Journal of Environmental Science and Health Part A-toxic/hazardous Substances & Environmental Engineering, 2006
In this paper a spatially distributed hydrologic model (WetSpa) is used to estimate daily river w... more In this paper a spatially distributed hydrologic model (WetSpa) is used to estimate daily river water discharge in Gorganrood river basin, Iran. The model combines topography, land use and soil maps, and observed daily meteorological time series to predict discharge hydrographs and the spatial distribution of hydrological parameters in the catchment. WetSpa model uses a modified rational method to calculate runoff and degree-day coefficient method to estimate the snow melt runoff based on temperature data. The runoff is routed through the basin along flow paths using a diffusive wave transfer method that enables to calculate response functions between any start and end point, depending upon slope, flow velocity and dissipation characteristic along the flow lines. The digital maps of topography, land use and soil type are 3 base maps used in the model in geographical information system (GIS) form using 90 × 90 m cell size. Results of the simulations show a good agreement between calculated and measured hydrographs at the outlet of the basin. The model predicts the daily hydrographs with a good accuracy, between 71 to 76% according to the Nash-Sutcliff criteria.
Environmental Earth Sciences, 2006
This paper refers to the development of a conceptual model for the management of a coastal aquife... more This paper refers to the development of a conceptual model for the management of a coastal aquifer in northern Greece. The research presents the interpretation and analysis of the quantitative (groundwater level recordings and design of piezometric maps) regime and the formation of the upcone within the area of investigation. Additionally it provides the elaboration of the results of chemical analyses of groundwater samples (physicochemical parameters, major chemical constituents and heavy metals and trace elements) of the area which were taken in three successive irrigation periods (July–August 2003, July–August 2004 and July 2005), in order to identify areas of aquifer vulnerability. The study identifies the areas where ion exchange phenomena occur, as well as the parts of the aquifer where the qualitative degradation of the aquifer system is enhanced. The paper, finally, assesses the lack of any scientific groundwater resources management of the area by the local water authorities, as well as the current practices of the existing pumping conditions scheme as applied by groundwater users.
Environmental Earth Sciences, 2005
This paper provides a detailed analysis of the geologic, hydrologic and hydrogeologic characteris... more This paper provides a detailed analysis of the geologic, hydrologic and hydrogeologic characteristics of Nestos River basin, which is formed within the Greek mountainous part of the river. The quantitative analysis was mainly based on the data of the river flow in different gauging points across the rivercourse as well as on the data of groundwater discharge from karst springs of the mountainous area while important conclusions were made regarding the hydraulic connection between the surface waters of the river and the groundwater of the karst aquifers of the basin. The qualitative analysis has shown that the quality of both surface waters and groundwaters of the investigated basin is high, whereas, no sources of contamination were indicated during this research. The possible effects of the two large dams of Platanovrisi and Thesavros are also analysed as they strongly affect the quantitative and qualitative regime of the river delta.
Water Resources Management, 2005
This paper refers to the development and verification of a groundwater artificial recharge model ... more This paper refers to the development and verification of a groundwater artificial recharge model in Xanthi plain, Thrace, Greece. The relative geological and hydrogeological research of the study area is described, as well as the artificial recharge application by reactivating an old stream bed of Kosynthos River, since 1994. The simulation of the aquifer system of the study area was achieved by the use of MODFLOW and involves both the model calibration and prediction of the aquifer system response. The verification of the 9-year-period model prediction for the first 7 years (1995–2001) proved successful, while the respective procedure for the last 2 years, 2002 and 2003, could not result in acceptable estimations.
Uploads
Papers by Andreas Kallioras