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Underground flow simulation in the wider area of ​​Mallia and Xersonhsos, Crete, using the FEFLOW model

Karampelas Stefanos

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Summary

In the context of the elaboration of this diploma thesis, the simulation of the hydraulic height using the mathematical model of finite elements FEFLOW is examined. The simulation that took place concerns the area of the Municipality of Hersonissos and more specifically the areas of Hersonissos and Malia. The municipality of Hersonissos is located in the northeastern part of the prefecture of Heraklion.In order to stimulate the hydraulic height in the study area properly, data had to be processed before they were entered into FEFLOW. Much of the data imported into FEFLOW was pre-processed in Microsoft Excel. The data of the results, concerning the observation wells and the stimulated values, were also processed, which were in the form of tables and thus were easier to edit. The model introduced 14 observation wells, which had hydraulic height values for the years 2000 to 2012. Then the values of hydraulic conductivity for the geological formation of the area, the initial hydraulic heights as well as the altitudes in the area, were introduced. The boundary conditions were then introduced at the boundaries of the area. Two types of marginal conditions were defined in the model. The first one was of constant hydraulic height which was replaced by a cosine-shaped boundary condition defined to the south of the study area. Finally, the model was calibrated and tested.The results extracted from FEFLOW are presented in detail, followed by a detailed commentary on them. The results show the final values in the model calibration error, which amounts to 13.996 m. Also presented are the values of the hydraulic heigh and Darcy’s velocity for the winter and summer seasons for the years 2001 and 2011, the comparison of the observed and simulated values of the area, as well as the change in hydraulic conductivity values for area formations. Finally, the conclusions that emerged from the modeling of the hydraulic height in the study area are recorded.

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