Publication: Modelización 3D del acuífero Terciario de Torrevieja.
Geometría del acuífero
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2009-07
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Instituto Geológico y Minero de España
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Abstract
El acuífero costero de Torrevieja se encuentra localizado en Alicante, al SE de España. La explotación intensiva de los acuíferos tiene lugar a comienzos de 1960, principalmente para cubrir las necesidades agrícolas de la zona. Durante estas últimas cuatro décadas, la industria hotelera ha sufrido un gran impulso en la zona, lo cual ha incrementado también la extracción de agua subterránea para consumo. Cerca de 5 millones de metros cúbicos por año son bombeados, provocando el efecto de intrusión marina. De acuerdo con las estimaciones existentes, la media de espesores de areniscas-calcáreas del acuífero está comprendida entre 30 y 100 m en un área de unos 167 km2 aproximadamente. Este nivel acuífero se encuentra sobre margas impermeables del Mioceno Superior, y confinado parcialmente a techo por margas blancas del Plioceno. Hay cerca de 13 km2 de afloramientos permeables los cuales permiten la recarga del acuífero mediante el agua de precipitación. Los límites impermeables rodean al acuífero completamente, excepto a lo largo en su borde oriental, donde está en contacto con el mar. Los nuevos datos obtenidos de los sondeos de investigación sugieren que el área del acuífero debería ser mucho menor. En este trabajo se presenta un análisis de los nuevos y los viejos sondeos de investigación que nos ayudarán a componer una representación 3D en profundidad de la geometría del sistema acuífero.
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.
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.