Utilising airborne electromagnetic data to map groundwater salinity and salt store at Chowilla, SA.

KokPiang Tan; Tim Munday; Larysa Halas; Kevin Cahill

doi:10.1071/ASEG2009ab135

ISSN: 2202-0586
E-ISSN:

oa Utilising airborne electromagnetic data to map groundwater salinity and salt store at Chowilla, SA.
Authors KokPiang Tan^a, Tim Munday^b, Larysa Halas^a and Kevin Cahill^b
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^a Geoscience Australia,, [email protected],, [email protected] ^b CSIRO Exploration and Mining,, Tim.Munday@csiro,au, , [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2009, Issue ASEG2009 - 20th Geophysical Conference, Dec 2009, p. 1 - 6
DOI: https://doi.org/10.1071/ASEG2009ab135
- Published online: 01 Dec 2009

Abstract

Introduction

The Chowilla floodplain in South Australia (Figure 1) is part of the Bookmark Biosphere Reserve with wetlands supporting a wide range of plants and animals, and has provided recreational opportunities to the general public (MDBC, 2006). However, the threats from saline groundwater and salt accumulation at the surface, combined with the overall low rainfall and the lack of natural flooding events in the recent past, have had a negative consequence for vegetation health, especially the river red gums. Information on the spatial patterns of groundwater salinity and the near surface (top 15 m) salt stores in the floodplain is integral to our understanding of floodplain hydrological processes that may be active in the Lower Murray Basin of Australia. This information can be used to help develop appropriate remedial activities for the management of ecologically important wetlands and in particular assist in the maintenance of a healthy vegetation community.

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References

Brodie, R.C., and Sambridge, M., 2006, A holistic approach to inversion of frequency-domain airborne EM data, Geophysics, v. 71(6), 301-312
Finnan, J.B. 1966. Stratigraphy of the Chowilla area in the Murray Basin. Quarterly Geological Notes. Geological Survey of South Australia. 20, 3-7.
Gill, E.D. 1973. Geology and geomorphology of the Murray River region between Mildura and Renmark, Australia. Memoirs of the National Museum of Victoria. 34, 1-97.
Lawrie, K.C., Gibson, D., Wilford, J., Tan, K.P., Pain, C., Munday, T., 2003. flapping salinity and groundwater systems: a mulit-disciplinary approach integrating geophysics and regolith geoscience. 16th ASEG, Adelaide.
Macnae, J.C., King, A., Stolz, N., Osmakoff, A. and Blaha, A., 1998. Fast AEM data processing and inversion. Expl. Geophys., 29, 163-169.
Murray-Darling Basin Commission 2006. The Chowilla Floodplain and Lindsay-Wallpolla Islands Icon Site Environmental Management Plan 2006-2007. MDBC Publication No. 33/06.
Tan, K.P., Berens,V., Hatch, M, and Lawrie, K., 2006, Determining the suitability of In Stream NanoTEM for delineating zones of salt accession to the River Murray: A review of survey results from Loxton, South Australia, CRCLEME Open File Report 192, 24pp.

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Article Type: Research Article

Keyword(s): Airborne Electromagnetic; Chowilla; floodplain; Salinity; Salt store

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oa Utilising airborne electromagnetic data to map groundwater salinity and salt store at Chowilla, SA.

Abstract

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