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

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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

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

Content Provider	Springer Nature Link
Author	Acworth, R. Ian Jankowski, Jerzy
Copyright Year	1997
Abstract	Dryland salinity occurs in some areas of the Liverpool Plains in northern New South Wales, Australia. Soils on the Plains comprise deep self-mulching Black Earths and form some of the country's most productive agricultural land. A survey of bulk electrical conductivity using an EM-31 was carried out over parts of the Plains with the intention of identifying areas at risk of developing salinity due to rising saline groundwater. Large variations in bulk electrical conductivity were identified by the EM-31 work, but interpretation of the data was uncertain. A trial site was selected for detailed study and a programme of additional surface geophysics, borehole geophysics, coring, laboratory measurements of chemical and physical properties of the cores, and chemical analysis was carried out. The results indicate that the ground associated with high values of bulk electrical conductivity is dominated by smectite clay containing high levels of entrained salts. Ground associated with low bulk electrical conductivity contains a fine-to-medium sand mixed with smectite clay. The data set demonstrates that clay content, and the salt entrained in the clay, is the dominant factor determining the bulk electrical conductivity in this area. The area may not, therefore, be a risk of developing dryland salinity. La salinité des régions sèches apparaît dans certains secteurs de plaines de Liverpool, dans le nord des Nouvelles Galles du Sud (Australie). Les sols de ces plaines sont formés de terres noires épaisses, constituant un paillage naturel, et sont parmi les terres agricoles les plus productives du pays. Un levé de terrain de la conductivitéélectrique globale, au moyen d'un EM-31, a été entrepris sur certaines parties des plaines, dans le but d'identifier les zones présentant un risque de salinisation par remontée d'eau souterraine salée. De larges variations de la conductivitéélectrique globale ont été mises en évidence au moyen du EM-31, mais l'interprétation de ces données est difficile. Un site expérimental a été défini pour une étude de détail et un programme de géophysique de surface complémentaire, avec des diagraphies de forages, du carottage, des mesures de laboratoire des propriétés chimiques et physiques des carottes et des analyses chimiques a été entrepris. Les résultats indiquent que le sol associé aux fortes valeurs de conductivitéélectrique est dominé par des smectites contenant des teneurs élevées en sels eintraînés. Le sol associéà des valeurs basses de la conductivitéélectrique contient un sable fin à moyen, mélangéà des smectites. L'ensemble des données montre que la teneur en argile et les sels entrînés dans l'argile est le facteur essentiel déterminant la conductivitéélectrique dans ce secteur. La salinización de tierras de secano tiene lugar en algunas zonas de las Llanuras de Liverpool en la parte norte de Nueva Gales del Sur, Australia. Los suelos de las Llanuras comprenden tierras negras de gran profundidad y forman algunas de las tierras de mayor productividad agrícola del país. Se realizó una campaña de conductividad eléctrica utilizando un EM-31 en algunas áreas de la Llanura, con la intención de identificar áreas de riesgo potencial de desarrollo de salinidad por el aumento de los niveles de agua subterránea salina. Se identificaron grandes variaciones de conductividad eléctrica, pero la interpretación de los datos estaba ligada a una gran incertidumbre. Se seleccionó una zona experimental para hacer estudios más de detalle, en la que adicionalmente se llevaron a cabo campañas geofísicas de superficie y en profundidad, testificación, medidas en laboratorio de las propiedades físico-químicas de los testigos y análisis constituidos por esmectita, con altos contenidos en sales de formación. En cambio, los suelos con valores bajos de conductividad eléctrica contienen arenas entre finas y medias, mezclada con esmectita. Se ha comprobado que el contenido de arcilla y de sales de formación es el factor determinante en los valores de conductividad eléctrica que se observan en este área. En consecuencia, este área posiblemente no presente riesgo de salinización.
Starting Page	109
Ending Page	123
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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