Institutional Repository
Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/3B258812-35CC-4D0C-BA0C-D604597A97D6 | ||
| Year | 2022 | ||
| Type of Item | Master Thesis | ||
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| Bibliographic Citation | Ourania Mourkakou, "Vulnerability mapping of karst aquifer and delineation of protection zones for springs and wells", Master Thesis, School of Mineral Resources Engineering, Technical University of Crete, Chania, Greece, 2022 https://doi.org/10.26233/heallink.tuc.92946 | ||
| Appears in Collections |
The purpose of this work is to establish an investigation framework) for the protection against pollution of the karstic aquifer, assessing the vulnerability of the aquifer and delineating protection zones for the springs and pumping wells.The study area is located in the northern part of Chania prefecture (Crete, Greece). It is characterized by difference in elevation from north towards south, due to tectonic evolution and karstification of the area. The aquifer is installed in karstic limestones and dolomites of the geotectonic unit of Trypali and is discharged mainly by a cluster of springs in Agyia area. At the same time, the system is being exploited through a series of wells, upstream of the springs.Initially, the vulnerability of Agyia’s aquifer was studied using three index methods (EPIK, PRESK and DRISTPi) that have been developed specifically for karst systems. The results showed the DRISTPi method is the most reliable, as it takes into account the net recharge and the groundwater flow in the karst.Subsequently, isochrone contours (contours of equal travel time of groundwater movement - hence pollutant movement too), were delineated around the springs and the pumping wells through two methods: a) by simulating groundwater flow using the MODFLOW-2000 software, and b) by empirical equations. The methods gave similar results.From the combination of the vulnerability mapping of karst aquifer and the isochrone zones of groundwater movement, three protection zones were designed around the water points of the karstic aquifer of Agyia.
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