NDLI: Assessment of the Capoterra coastal plain (southern Sardinia, Italy) by means of hydrogeological and geophysical studies

Content Provider	Springer Nature Link
Author	Balia, R. Ardau, F. Barrocu, G. Gavaudo, E. Ranieri, G.
Copyright Year	2008
Abstract	Hydrogeological and geophysical surveys confirm that the aquifers of the Capoterra plain in Sardinia (Italy) constitute a complex, multilayer system. In the north-east of the plain, this system is composed of a shallow aquifer of recent alluvium and a deeper aquifer separated from the former by a clay layer; in the south-west there is no separation between the two aquifers. The deepest and most important member of the multilayer aquifer system is situated at the transition from Quaternary to Miocene sediments. With respect to deep structures and stratigraphy, several differentiations inside the Miocene sedimentary filling, whose overall thickness is in the order of 300 m, have been found. The combined interpretation of several datasets allows the Capoterra plain to be reliably modelled from surface to a depth of several hundreds of metres and provides the possibility of finding deeper groundwater resources. Concerning the latter, since Miocene materials are known to be impermeable in the middle of the plain, in contrast to the aquifers hosted in the Quaternary sediments and alluvium, the probability of finding fresh water at a depth of less than 350–400 m is very low. The condition of seawater intrusion affecting the aquifers is also elucidated.Les études hydrogéologiques et géophysiques confirment que les aquifères de Capoterra, plaine de Sardaigne (Italie), constituent un système complexe et multicouches. Au nord-est de la plaine, ce système est constitué d’un aquifère superficiel d’alluvions récentes séparé d’un aquifère profond par des argiles. Il existe une continuité entre ces deux aquifères dans sa partie sud-ouest. La partie profonde de l’aquifère composée de dépôts sédimentaires du Quaternaire et Miocène est la plus importante du système multicouche. Plusieurs différences dans la stratigraphie et les structures profondes peuvent être mises en évidence au sein du remplissage Miocène qui est d’épaisseur globale de l’ordre de 300m. L’interprétation de l’ensemble des données permet la modélisation de la plaine de Capoterra depuis la surface jusqu’à plusieurs centaines de mètres de profondeur ce qui donne la possibilité de trouver des ressources en eaux à grande profondeur. Toutefois, du fait que le matériel composant le Miocène est connu comme étant imperméable au centre de la plaine au contraire de l’aquifère quaternaire et alluvions, la probabilité de trouver de l’eau douce à des profondeurs de moins de 350–400 m est faible. La dynamique de l’intrusion marine affectant l’aquifère est également comprise.Los relevamientos hidrogeológicos y geofísicos confirman que los acuíferos de la planicie de Capoterra en Cerdeña (Italia) constituyen un sistema multicapa complejo. En el noreste de la llanura, este sistema está compuesto por un acuífero somero aluvial reciente y un acuífero profundo separado del anterior por una capa arcilla; en el sudoeste no existe separación entre los dos acuíferos. El miembro más importante y más profundo del sistema acuífero multicapa está situado en la transición de los sedimentos Cuaternarios a los Miocenos. Con respecto a las estructuras profundas y a la estratigrafía, se han encontrado varias diferenciaciones dentro del relleno sedimentario Mioceno, cuyo espesor total es del orden de 300 metros. La interpretación combinada de varios conjuntos de datos permite modelar en forma confiable a la llanura de Capoterra desde la superficie hasta una profundidad de varios cientos de metros y ofrece la posibilidad de localizar recursos de agua subterránea a mayor profundidad. En relación con estos últimos, puesto que se conoce que los materiales del Mioceno son impermeables en la parte media de la llanura, en contraste con los acuíferos reconocidos en los sedimentos Cuaternarios y aluviales, la probabilidad de encontrar agua dulce a profundidades menores de 350–400 m es muy baja. Se analizó también la posibilidad de afectación de la intrusión marina en los acuíferos.Levantamentos hidrogeológicos e geofísicos confirmam que os aquíferos da planície de Capoterra na Sardenha (Itália) constituem um sistema complexo e multicamada. No nordeste da planície, este sistema é composto por um aquífero superficial aluvionar de idade recente e um aquífero mais profundo, separado do primeiro por uma camada de argila; a sudoeste esta separação entre os dois aquíferos não existe. A mais profunda e principal zona do sistema aquífero multicamada situa-se na transição dos sedimentos Quaternários para Miocénicos. No que diz respeito a estratigrafia e estruturas profundas, foram encontradas várias diferenciações no preenchimento sedimentar Miocénico, cuja espessura total é da ordem de 300 m. A interpretação articulada de vários conjuntos de dados permite a modelação fiável da planície de Capoterra, desde a superfície até uma profundidade de várias centenas de metros, e fornece a possibilidade de encontrar águas subterrâneas mais profundas. Relativamente a esta última questão, uma vez que os sedimentos Miocénicos são conhecidos por serem impermeáveis no centro da planície, em contraste com os aquíferos instalados nos sedimentos Quaternários e no aluvião, a probabilidade de encontrar água doce a uma profundidade inferior a 350–400 m é muito reduzida. Também é esclarecida a intrusão marinha que afecta os aquíferos.
Starting Page	981
Ending Page	997
Page Count	17
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	17
Issue Number	4
e-ISSN	14350157
Language	Portuguese
Publisher	Springer-Verlag
Publisher Date	2008-12-06
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Coastal aquifers Geophysical methods Groundwater exploration Salt-water/fresh-water relations Italy Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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