Salinity monitoring of the Murray River using a towed TEM array

Brian Barrett; Michael Hatch; Graham Heinson; Andrew Telfer

doi:10.1071/ASEG2003ab009

ISSN: 2202-0586
E-ISSN:

oa Salinity monitoring of the Murray River using a towed TEM array
Authors Brian Barrett^a, Michael Hatch^b, Graham Heinson^c and Andrew Telfer^d
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^a University of Adelaide, , Australia, [email protected] ^b Zonge Engineering and Research Organisation, [email protected] ^c University of Adelaide, , Australia, [email protected] ^d Australian Water Environments, , Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2003, Issue ASEG2003 - 16th Geophysical Conference, Aug 2003, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2003ab009
- Published online: 01 Aug 2003

Abstract

Successful implementation of a salt interception schemes (SIS) requires monitoring to determine locations where the scheme needs revision. Current monitoring methods involve near-surface water-salinity measurements, which are affected by water-flow displacement. A survey method that can determine the salinity of water contained in the top few metres of alluvial sediments immediately beneath the river would be a more accurate tool for SIS monitoring.

A fast sampling Transient EM technique is investigated as a potential tool for imaging the conductivity of the top 5m of sediment, and thus monitoring the Waikerie SIS in South Australia’s Riverland. A towed TEM array was used to collect 9km of data that shows resistive anomalies correlating with SIS production bores. The system has the advantage of being a small, manageable array and the short inversion time allows same-day interpretation.

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References

Allan, D., Merrick, N., 2003, A floating electrode array for continuous geoelectrical imaging: this issue.
Barnett, S.R., 1989, The effect of land clearance in the Mallee region on River Murray salinity and land salinisation: BMR Journal of Australian Geology & Geophysics, 11, 205-208.
Barrett, B., Heinson, G., Hatch, G., Telfer, A., 2002, Geophysical methods in saline groundwater studies: locating perched water tables and fresh water lenses: Exploration Geophysics, 33, No. 2, 115-121.
Evans, R.S., 1989, Saline water diposal options: BMR Journal of Australian Geology & Geophysics, 11, 167-188.
Hatch, M., Barrett, B., Bennetts, D., Heinson, G., Telfer, A., Roberts, C, 2002, Improved Near Surface Mapping in Groundwater Studies: Application of Fast-Sampling Time-Domain EM Surveying Methods: Preview, No. 96, 25-29.
Lindsay, J.M., Barnett, S.R., 1989 Aspects of stratigraphy and structure in relation to the Woolpunda Groundwater Interception Scheme, Murray Basin, South Australia: BMR Journal of Australian Geology & Geophysics, 11, 219-226.
Machines, S., Raymond, M., 2001, STEMINV documentation - Smooth-Model TEM Inversion, version 3.00: Zonge Engineering and Research Organisation, inc.
Porter, B., 1997, Run of River Salinity Surveys - Data Collection and Calculations Results and Recommendations: Department for Environment, Heritage and Aboriginal Affairs, South Australia, Natural Resources Division, Murraylands Region, Water Resources report 2/97.
Telfer, A., Watkins, N., 1991, Waikerie Salt Interception Scheme - Final Design Report Hydrogeology: Engineering and Water Supply (EWS) Department, South Australia (Obtained from Australian Water Environments).
Trewhella, W., 1989, Irrigation recharge: BMR Journal of Australian Geology & Geophysics, 11, 205-208.
Wall, M., Bone, Y., Hopkins, B., Telfer, A., 2001, Murray Basin stratigraphy and its relevance to the Waikerie Salt Interception Scheme, Waikerie, South Australia: B.Sc. (Hon) Thesis, University of Adelaide, Department of Geology and Geophysics, Adelaide (unpublished).

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Article Type: Research Article

Keyword(s): salt interception; towed geophysics; transient EM

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