Papers by Konstantinos Katsifarakis
Environmental processes, Feb 5, 2024
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WIT Transactions on Ecology and the Environment, 1970
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Authorea (Authorea), Jan 20, 2023
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Global Nest Journal, Apr 30, 2013
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This paper focuses on deriving new approximate analytical solutions in wedge-shaped aquifers. The... more This paper focuses on deriving new approximate analytical solutions in wedge-shaped aquifers. The proposed methodology is applicable to any type of aquifer namely, leaky, confined and unconfined, under both steady state and transient flow conditions. By applying the method of images and seperating the flow field into sections using physical arguements, analytical expressions are obtained for the drawdown function. In contrast to the conventional theory, the proposed solutions are applicable to arbitrary wedge angle. Comparison of the results of the derived approximate analytical solutions to numerical ones, is considered necessary to ensure its validity. MODFLOW, a well-known numerical tool is used to calculate the numerical results. The results indicate that the boundary conditions are fully observed, the drawdown is feasible to be calculated at any point of the real flow field (continuity of the drawdown function) and discrepancies compared to numerical results are considered negl...
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Procedia environmental sciences, 2017
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Operational Research, Feb 13, 2019
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Water Resources Management, Mar 1, 2022
This paper deals with optimization of extracting groundwater by a number of users (stakeholders) ... more This paper deals with optimization of extracting groundwater by a number of users (stakeholders) from a common aquifer. The aim is to reduce their pumping cost and the respective energy consumption, taking into account the schedule preferences of the users (e.g. pumping during the day instead of during the night). Moreover, it is postulated that alternate pumping reduces pumping cost. To facilitate the participation of stakeholders in achieving the best alternate pumping schedule, the problem is formulated as an anti-coordination game. Using vertices to represent the players (users) and weighted edges to represent their interactions we have created an algorithm that can be used to get players’ payoffs. Then, assuming that the players are allowed to improve their payoffs by playing consecutive moves, we use our algorithm to find the Nash equilibria of the game. However, not all games converge to the same Nash equilibria, as changing the sequence of the players can result in different solutions. Therefore, we use Genetic Algorithms to find the sequence of the players that minimizes the overall pumping cost or the energy consumption, using the least possible game rounds. The algorithm proposed can be used by researchers and authorities to promote cooperation between well users, leading to financial and environmental benefit.
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Water Resources Management, Apr 16, 2013
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Hydrological Sciences Journal-journal Des Sciences Hydrologiques, Sep 4, 2017
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Journal of Hydrology, Oct 1, 2009
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Engineering Analysis With Boundary Elements, Jul 1, 1999
The boundary element method (BEM) can be used very efficiently, in solving groundwater flow probl... more The boundary element method (BEM) can be used very efficiently, in solving groundwater flow problems. Genetic algorithms (GAs) constitute a very efficient optimization tool. In this paper, BEM and GAs have been combined to find optimal solutions in three classes of commonly encountered groundwater flow and mass transport problems: (a) determination of transmissivities in zoned aquifers (inverse problem), based on a restricted number of field measurements; (b) minimization of pumping cost from any number of wells under various constraints; and (c) hydrodynamic control of a contaminant plume, by means of pumping and injection wells. Application examples show that the proposed combination is very efficient in optimizing development and protection of groundwater resources.
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International Journal of Sustainable Development and Planning, 2007
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Water Resources Management, Sep 12, 2020
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WIT transactions on state-of-the-art in science and engineering, Jul 11, 2012
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Papers by Konstantinos Katsifarakis