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Vertical Hydrochemical Zonation in a Coastal Section of the Botany Sands Aquifer, Sydney, Australia

Content Provider	Springer Nature Link
Author	Lavitt, N. Acworth, R.I. Jankowski, J.
Copyright Year	1997
Abstract	Near Sydney, Australia, unconsolidated aeolian and alluvial sediments of Quaternary age form the Botany Sands aquifer and lie unconformably on Triassic-age sandstone (Narrabeen Group). Botany Bay is an inlet of the Pacific Ocean about 10 km south of the city centre. Reclamation of the northern foreshore of Botany Bay commenced in 1979. One impact of this reclamation was to move the saline interface in the aquifer southward.In 1993, a multi-level piezometer and a cored borehole were installed at a location coincident with the foreshore position, prior to reclamation. Analysis of data from this site indicates that distinctive hydrochemical zonation now exists within the aquifer. Southward-flowing groundwater has removed the saline water from the upper 24 m of the sand column. Below this depth, peat beds occur that appear to form the base of active aquifer flushing. Groundwater from beneath the peat beds has the chemical characteristics of partially flushed sea water. At a depth interval of 14–21 m, a contaminant plume has been identified; its probable source is a non-putrescible landfill, about 2.5 km up the groundwater gradient. Près de Sydney, en Australie, des sédiments quaternaires non consolidés d'origine éolienne et alluviale constituent l'aquifère des sables de Botany, qui reposent en discordance sur les grès triasiques de la série de Narrabeen. La baie de Botany est ouverte sur l'Océan Pacifique, à 10 km environ du centre de la ville. L'aménagement de la plage nord a débuté en 1979. Il a provoqué la progression du biseau salé dans la partie sud de l'aquifère.En 1993, un piézomètre à niveaux multiples et un forage carotté ont été mis en place, dans une situation correspondant à la position originelle de la plage, avant l'aménagement. L'analyse des données de ce site montre qu'il existe actuellement une zonation hydrochimique dans l'aquifère. L'eau souterraine s'écoulant vers le sud a repoussé l'eau salée des 24 m supérieurs de la colonne de sable. Au dessous, il existe des niveaux de tourbe qui paraissent constituer la base du drainage actif de l'aquifère. L'eau souterraine sous les niveaux de tourbe présente les caractères chimiques d'eau de mer partiellement entraînée. A la profondeur de 14–21 m, un panache de pollution a été observé; son origine probable est une décharge de produits non fermentescibles, à 2,5 km en amont. Cerca de Sidney, Australia, el acuífero de Botany Sands, formado por sedimentos eólicos y aluviales no consolidados, se dispone discordantemente sobre unas areniscas de edad triásica (Grupo Narrabiense). La Bahía de Botany Bay es una ensenada del Océano Pacífico situada a unos 10 km al sur del centro de la ciudad. La recuperación de la línea de costa al norte de Botany Bay comenzó en 1979, y su mayor impacto consistió en desplazar la interfaz salina hacia el sur.En 1993, un piezómetro puntal de medida multi-nivel y un sondeo estaban instalados coincidiendo con la línea de costa, previo al inicio de la recuperación. El análisis de los datos en estos sondeos indican que existe una zonación hidroquímica en el acuífero. El flujo de agua subterránea en dirección sur ha desplazado el agua salina de los 24 m superiores de la columna arenosa. Por debajo existen niveles de turba que forman la base de la zona de lavado del acuífero. El agua subterránea bajo los niveles de turba muestra las características químicas de agua de mar parcialmente lavada. Se ha identificado un penacho de contaminación a una profundidad entre 14 y 21 m, que puede tener su origen en un relleno de materiales inertes situado unos 2.5 km aguas arriba.
Starting Page	64
Ending Page	74
Page Count	11
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	5
Issue Number	2
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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