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Μοντελοποίηση του φαινομένου της υφαλμύρινσης με χρήση του προσομοιωτή MODFLOW - SEAWAT στην περιοχή Τυμπακίου, Κρήτης

Valsamidou Archontoula

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URI: http://purl.tuc.gr/dl/dias/5AC27E90-2DDE-4BBB-92D5-2DD43AEE0DEA
Year 2017
Type of Item Diploma Work
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Summary

The present study investigates the salinization problem in aquifers, i.e. the saltwater intrusion in a water body. The method used is based on the three dimensional variable density groundwater flow. Salinization is an important environmental problem caused by human activities and natural reasons. It often occurs in coastal aquifers that lie close to big bodies of brine. In this study, the place examined is Tymbaki, in Heraklion, Crete. Tymbaki is particularly important due to the agricultural and touristic activities. To cover the needs from these activities, the needed amount of water that is being pumped from the aquifer and the natural characteristics of the area result in the salinization problem that has progressed inland. Firstly there are described the basic concepts and equations regarding the groundwater flow, the salinization problem and how it can be investigated. Additionally there are presented the results of various studies regarding the salinization problem on the island of Crete. Moreover the place of interest is presented along with all its characteristics that interact in the saltwater intrusion. At this point results from previous studies are presented and explained. For the simulation of the groundwater flow and the contaminant (salt) the mathematical problem is solved with a numerical model, MODFLOW – SEAWAT. The problem solved is that of three – dimensional, finite difference groundwater flow. Initial conditions, boundary conditions, and hydraulic conductivity values fow the basin were used in order to perform the model calibration and simulation. The results of the simulation are then collated with those of a study that examines the saltwater intrusion with spatial distribution maps of electrical conductivity measures of the area. The goal of this is to check how well the simulation of the saltwater intrusion front is presented. Lastly, the conclusions of the simulation are presented and there are given proposals for the solution and prevention of the problem.

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