NDLI: Testing Alternative Conceptual Models of Seawater Intrusion in a Coastal Aquifer Using Computer Simulation, Southern California, USA

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The Relationship Between Bulk Electrical Conductivity and Dryland Salinity in the Narrabri Formation at Breeza, Liverpool Plains, New South Wales, Australia

Samuel Mandel: International Teacher of Hydrogeology

Konrad Keilhack: Pioneer of German Hydrogeology

Hydrogeology Journal : Volume 5, Issue 2, February 1997

Hydrogeology Journal : Volume 5, Issue 1, January 1997

Testing Alternative Conceptual Models of Seawater Intrusion in a Coastal Aquifer Using Computer Simulation, Southern California, USA

Content Provider	Springer Nature Link
Author	Nishikawa, Tracy
Copyright Year	1997
Abstract	Two alternative conceptual models of the physical processes controlling seawater intrusion in a coastal basin in California, USA, were tested to identify a likely principal pathway for seawater intrusion. The conceptual models were tested by using a two-dimensional, finite-element groundwater flow and transport model. This pathway was identified by the conceptual model that best replicated the historical data. The numerical model was applied in cross section to a submarine canyon that is a main avenue for seawater to enter the aquifer system underlying the study area.Both models are characterized by a heterogeneous, layered, water-bearing aquifer. However, the first model is characterized by flat-lying aquifer layers and by a high value of hydraulic conductivity in the basal aquifer layer, which is thought to be a principal conduit for seawater intrusion. The second model is characterized by offshore folding, which was modeled as a very nearshore outcrop, thereby providing a shorter path for seawater to intrude. General conclusions are that: 1) the aquifer system is best modeled as a flat, heterogeneous, layered system; 2) relatively thin basal layers with relatively high values of hydraulic conductivity are the principal pathways for seawater intrusion; and 3) continuous clay layers of low hydraulic conductivity play an important role in controlling the movement of seawater. Deux modèles conceptuels alternatifs pour décrire les processus physiques contrôlent l'intrusion d'eau de mer dans un bassin littoral en Californie ont été testés, afin d'identifier le cheminement principal probable de l'intrusion marine. Ces modèles ont été testés en utilisant un modèle de transport et d'écoulement d'eau souterraine en éléments finis en 2-D. Ce cheminement a été identifié par le modèle conceptuel qui a le mieux reproduit les données historiques. Le modèle numérique a été appliqué en section transversale à un canyon sous-marin qui est le principal accès de l'eau marine dans le système aquifère de la région étudiée.Les deux modèles sont caractérisés par un aquifère hétérogène,, multicouche. Cependant, le premier modèle décrit un aquifère à couches horizontales, à forte valeur de la conductivité hydraulique dans son niveau de base dont on suppose que c'est le principal axe d'intrusion marine. Le second modèle est caractérisé par un pli au large, qui a été représenté en affleurement très proche de la côte, et créant un cheminement plus court permettant à l'eau marine de pénétrer. Les conclusions générales sont les suivantes: 1) le système aquifère est modélisé le mieux comme un aquifère multicouche, plat et hétérogène; 2) les niveaux fins de la base, avec des valeurs relativement fortes de la conductivité hydraulique sont les principaux axes de l'intrusion marine; 3) des niveaux argileux continus à faible conductivité hydraulique jouent un rôle important dans le contrôle des mouvements de l'eau marine. Se han estudiado dos modelos conceptuales alternativo sobre los procesos físicos que controlan la intrusión marina en una cuenca costera en California, Estados Unidos de América, para identificar la probable vía principal de intrusión. Estos modelos conceptuales se han verificado mediante un modelo de flujo y transporte bidimensional en elementos finitos. Como vía de intrusión se considera la identificada por el modelo conceptual que ajusta mejor los datos históricos. El modelo numérico fue aplicado en una sección vertical de un cañón submarino, que es una vía principal de entrada de agua de mar al acuífero de la zona estudiada.Ambos modelos se caracterizan por un acuífero heterogéneo, estratificado. El primer modelo se basa en un acuífero formado por estratos planos, con una alta permeabilidad en el acuífero basal inferior, a través del cual se produce la principal entrada de agua marina. El segundo modelo se caracteriza por la presencia de pliegues marinos, que se han modelado como un afloramiento cercano a la costa, resultando en una vía de intrusión. Las conclusiones generales son: 1) El acuífero se modela mejor como estratificado y heterogéneo; 2) las vías principales de intrusión son capas, relativamente poco potentes, de niveles basales con mayor conductividad hidráulica; 3) capas continuas de arcilla, de baja conductividad, condicionan el movimiento del agua marina.
Starting Page	60
Ending Page	74
Page Count	15
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	5
Issue Number	3
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-11-20
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogeology Geology Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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