3D Model of the Torrevieja Tertiary aquifer. Geometry of the aquifer
DOI:
https://doi.org/10.21701/bolgeomin.120.1.005Keywords:
aquifer geometry, geostatistics, salt water intrusion, three-dimensional model, TorreviejaAbstract
The Torrevieja coastal aquifer is located in Alicante, SE Spain. Intensive exploitation of the aquifer began in the 1960s, mainly in order to meet agricultural needs. During these last four decades, the hospitality industry has also experienced a dramatic boost in the area, which in turn has led to a further increase in groundwater abstraction. About 5 million cubic metres per year are currently pumped, leading to seawater intrusion concerns. According to the existing estimates, the average thickness of the sandstone/limestone aquifer level ranges between 30 and 100 m over an area of approximately 167 km2. This level is underlain by an impervious Upper Miocene marl layer, whilst a white Pliocene marl layer partially confines the aquifer top. There are about 13 km2 of permeable outcrops which allow for rain water recharge to take place. Impervious boundaries completely surround the aquifer, except along the eastern side, where it is in contact with the sea. Newly obtained borehole data however seems to modify these, and suggests that the aquifer area might be significantly smaller. This paper presents an analysis of new and old borehole records that ultimately aims at developing a 3D representation of the in-depth geometry of the system.
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