Groundwater Flow Modelling of the Alluvial Aquifer in the Mouria Area, SW Greece (original) (raw)
Related papers
2011
The aim of this paper is to characterize the regional groundwater flow system in the Tirnavos alluvial basin, and to develop and apply appropriate models for assessing artificial recharge as a way to restore and manage regional groundwater resources in eastern Thessaly-central Greece. Simulation of the aquifer system in the study area was performed on FEFLOW and the calibrated model was then used for the feasibility assessment of alternative groundwater management strategies based on groundwater artificial recharge. It was demonstrated that groundwater artificial recharge is technically feasible and financially reasonable, thus presents a viable solution to restoration of the aquifer system in the study area.
The continuous over-exploitation of groundwater resources due to the increased demand for irrigation water has lowered water tables in many riparian areas, threatening thus many water-stressed regions. This over-exploitation, especially when combined with quality degradation, has significant ecological and economic implications. Therefore, future water management requires both environmental and economic information. The simulation of a real situation, by means of a mathematical model, contributes to this direction. Namely, a two-dimensional transient flow simulation in the aquifer of N. Moudania was performed, in order to assess: (a) the impact of hydraulic head distribution on the pumping depth of groundwater, as well as, (b) its relative (long-term) effect on pumping costs. The simulation was carried out using the modular three-dimensional finite-difference groundwater flow model MODFLOW, while the economic cost was estimated based on the energy (electricity) cost for pumping irri...
bio.auth.gr
The aim of this paper is to characterize the regional groundwater flow system in the Tirnavos alluvial basin, and to develop and apply appropriate models for assessing artificial recharge as a way to restore and manage regional groundwater resources in eastern Thessaly-central Greece. Simulation of the aquifer system in the study area was performed on FEFLOW and the calibrated model was then used for the feasibility assessment of alternative groundwater management strategies based on groundwater artificial recharge. It was demonstrated that groundwater artificial recharge is technically feasible and financially reasonable, thus presents a viable solution to restoration of the aquifer system in the study area.
Water Supply, 2017
The purpose of this study is to investigate the saltwater intrusion phenomenon in the alluvial aquifer of Katapola, on Amorgos Island, under current and future climatic conditions and to provide groundwater management options for alleviating this problem. To this end, a groundwater flow model was developed and the sharp-interface approximation combined with the Ghyben–Herzberg equation was used. A correction factor that accounts for the hydrodynamic dispersion occurring at the brackish zone was also incorporated in the analysis. The model results show that under the current pumping strategy, the saltwater intrusion front extent is vast, posing a serious threat to the quality of groundwater used for drinking and irrigation in the area. The management goal is to find the alternative pumping scenarios for the existing well network that will prevent further spreading of saltwater intrusion. Several water management scenarios were developed, taking into account the effects of climate cha...
geolib.geo.auth.gr
FEFLOW is a relatively new simulation code that was applied and tested systematically for the first time in Greece at Tirnavos alluvial basin, which is part of the eastern Thessaly plain. The aim of this exercise is to apply and test the applicability and versatility of FEFLOW in the simulation of groundwater flow of the Tirnavos basin aquifer system, which is located in eastern Thessalycentral Greece. From the compilation and calibration of the mathematical model, it can be concluded that FEFLOW is a very powerful tool with many practical applications and capabilities. Application of FEFLOW at Tirnavos basin was successful. As deduced by field data analysis, groundwater resources of the study area are overexploited, a fact which bears negative effects not only for the study area, but also for the surrounding area, which is much greater in extent. This fact was well reproduced in the simulation. It is therefore of utmost importance to rationally manage regional groundwater resources aiming at aquifer restoration (quantity and chemical quality) and the environmental protection of both the aquifer system and the depended and interrelated ecosystems, in accordance to the water related EC Directives.
Investigation of groundwater flow in Krokos aquifer, Greece, to protect a springs’ area
This paper deals with the water quality problem of Krokos aquifer, in Western Macedonia, Greece. In this aquifer, concentrations of nitrates, exceeding the legislation limits, had been occasionally detected. At first, some additional water quality measurements took place, which confirmed rather high concentrations of nitrates that although close, do not exceed though the allowed level limit of 50 mg/L. Then, numerical simulation of groundwater flow in Krokos aquifer, took place, whose springs provide water to Krokos town. GMS software, which allows for construction of a three dimensional flow model, was used in this task. First, the boundaries of the aquifer and the respective boundary conditions were defined, based on available field data. Then the required hydraulic head and groundwater velocity values were calculated. Finally, by using the particle-tracking package MODPATH, the spring protection area from pollution sources was defined.
Bulletin of the Geological Society of Greece, 2017
FEFLOW is a relatively new simulation code that was applied and tested systematically for the first time in Greece at Tirnavos alluvial basin, which is part of the eastern Thessaly plain. The aim of this exercise is to apply and test the applicability and versatility of FEFLOW in the simulation of groundwater flow of the Tirnavos basin aquifer system, which is located in eastern Thessaly-central Greece. From the compilation and calibration of the mathematical model, it can be concluded that FEFLOW is a very powerful tool with many practical applications and capabilities. Application of FEFLOW at Tirnavos basin was successful. As deduced by field data analysis, groundwater resources of the study area are overexploited, a fact which bears negative effects not only for the study area, but also for the surrounding area, which is much greater in extent. This fact was well reproduced in the simulation. It is therefore of utmost importance to rationally manage regional groundwater resource...
The aim of this study is to simulate the groundwater flow in the Elassona-Tsaritsani basin aquifer with the MODFLOW code. The basin of Elassona – Tsaritsani is located in the central part of Thessaly and belongs to the prefecture of Larissa. In the last years, a continuous increase in water demands for irrigation use is observed in this basin. The water demands of the basin are mainly met by the alluvial aquifer which is located in the central part of the basin and which consists of pebbles, gravel and sand. The karstic aquifer of Tirnavos-Damasio is located in the southeastern part of the basin, while aquifers of fissured rocks - which are of local interest in fault zones - are located in the northwestern part. The groundwater flow simulation of the Elassona unconfined alluval aquifer was obtained with the MODFLOW code. The model was applied in steady state and the results presented a reliable model of the basin aquifer. In order to estimate the sensitivity of the model groundwater flow, three different scenarios were applied in which precipitation was decreased by 25% and 50% and the pumping rate was increased by 50%. The results of the steady-state MODFLOW model approach the observation data sufficiently. Moreover, the lateral subsurface recharge of the alluvial aquifer from the fissured rocks aquifer (NW) and the outflow to the karst aquifer in the southwestern part was confirmed. Also, the groundwater flow of the study area proved to be more sensitive to the increase of the pumping rates than to the decrease of precipitation. Finally, what is emphasized in this paper is the importance of reliable, continuous and high frequency monitoring of the hydraulic and hydrological parameters of the aquifers of Greece.
Environmental Earth Sciences, 2006
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.
International conference: Protection and restoration of the environment XIV, Thessaloniki, Greece, 2018
The need of integrated surface water-groundwater management is well recognized, since this type of management can provide a comprehensive and coherent understanding of the water cycle on catchment-level, leading to the proper and efficient use of water. Moreover, integrated water resources management (IWRM) is strictly imposed by the European Union Framework Directive 2000/60/EC and all relevant European and national legislation. An important role towards the successful implementation of IWRM plays the application of numerical modeling, through the coupling of hydrological models with groundwater flow models. Model coupling, even though it is a complex procedure including a number of conceptual and computational challenges, is widely used in modern IWRM. In this perspective, the present study investigates the interaction between surface water and groundwater on catchment-level by developing an integrated modeling system consisting of a hydrological and a groundwater model. The hydrological model was constructed within the framework of the widely used software Soil and Water Assessment Tool (SWAT), while the groundwater model was formed applying the MODFLOW code, which has evolved into the worldwide standard computer program used in groundwater modeling. The aforementioned models were interlinked and applied for the combined simulation of hydrological processes and groundwater flow in Upper Anthemountas basin. Moreover, a sensitivity analysis was performed in the case of groundwater flow model in order to investigate the impact of various model parameters (e.g. hydraulic conductivity, storativity, wells pumping rates, boundary conditions) on the model results (hydraulic head), which will be helpful in the case of a future calibration of the model.