Great Artesian Basin

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

Great Artesian Basin
Great Artesian Basin.png
Great Artesian Basin in Australia
LocationAustralia
Area1,700,000 km2 (660,000 sq mi)
Lightning Ridge bathing thermes supplied by artesian bore water
Hot water bore hole into the Great Artesian Basin in Thargomindah
Beel's Bore, Hariman Park near Cunnamulla.

The Great Artesian Basin (GAB[1]), located in Australia, is the largest and deepest artesian basin in the world, stretching over 1,700,000 square kilometres (660,000 sq mi), with measured water temperatures ranging from 30–100 °C (86–212 °F). The basin provides the only source of fresh water through much of inland Australia.[2]

The Basin underlies 22% of the continent,[3] including the states and territories of Queensland (most of), the Northern Territory (the south-east corner of), South Australia (the north-east part of), and New South Wales (northern part of). The basin is 3,000 metres (9,800 ft) deep in places and is estimated to contain 64,900 cubic kilometres (15,600 cu mi) of groundwater.[4] The Great Artesian Basin Coordinating Committee (GABCC)[5] coordinates activity between the various levels of government and community organisations.

Physiography[edit]

This area is one of the distinct physiographic provinces of the larger East Australian Basins division, and includes the smaller Wilcannia Threshold physiographic section.

Geology[edit]

The water of the GAB is held in a sandstone layer laid down by continental erosion of higher ground during the Triassic, Jurassic, and early Cretaceous periods. During a time when much of what is now inland Australia was below sea level, the sandstone was then covered by a layer of marine sedimentary rock shortly afterward, which formed a confining layer, thus trapping water in the sandstone aquifer. The eastern edge of the basin was uplifted when the Great Dividing Range formed. The other side was created from the landforms of the Central Eastern Lowlands and the Great Western Plateau to the west.

Most recharge water enters the rock formations from relatively high ground near the eastern edge of the basin (in Queensland and New South Wales) and very gradually flows toward the south and west.[6] A much smaller amount enters along the western margin in arid central Australia, flowing to the south and east. Because the sandstones are permeable, water gradually makes its way through the pores between the sand grains, flowing at a rate of one to five metres per year.

Discharge water eventually exits through a number of springs and seeps, mostly in the southern part of the basin. The age of the groundwater, determined by carbon-14 and chlorine-36 measurements combined with hydraulic modelling, ranges from several thousand years for the recharge areas in the north to nearly 2 million years in the south-western discharge zones.[7]

Water source[edit]

Prior to European occupation, waters of the GAB discharged through mound springs, many in arid South Australia, such as Witjira-Dalhousie Springs. These springs sustained a variety of endemic invertebrates, such as molluscs, and supported extensive Aboriginal communities and trade routes.[8] After the arrival of Europeans, the springs facilitated exploration, and allowed the provision of faster communications between south-eastern Australia and Europe, via the Australian Overland Telegraph Line.[8] The Great Artesian Basin became an important water supply for cattle stations, irrigation, and livestock and domestic purposes, and is a vital life line for rural Australia.[9] To tap it, boreholes are drilled down to a suitable rock layer, and the pressure of the water often forces it up without the need for pumps.

The discovery and use of the water in the Great Artesian Basin allowed the settlement of thousands of square kilometres of country away from rivers in inland New South Wales, Queensland, and South Australia, that would otherwise have been unavailable for pastoral activities. European discovery of the basin dates from 1878 when a shallow bore near Bourke produced flowing water. There were similar discoveries in 1886 at Back Creek east of Barcaldine, and in 1887 near Cunnamulla.[9][10]

In essence, water extraction from the GAB is a mining operation, with recharge much less than current extraction rates. In 1915, there were 1,500 bores providing 2,000 megalitres (1,600 acre⋅ft) of water per day, but today the total output has dropped to 1,500 megalitres (1,200 acre⋅ft) per day.[4] This included just under 2000 freely-flowing bores and more than 9000 that required mechanical power to bring water to the surface. Many bores are unregulated or abandoned, resulting in considerable water wastage. These problems have existed for many decades, and in January 2007 the Australian Commonwealth Government announced additional funding in an attempt to bring them under control. However, many of the mound springs referred to above have dried up due to a drop in water pressure, probably resulting in extinction of several invertebrate species.[11][12]

The Olympic Dam mine in South Australia is permitted to extract up to 42 million litres of water daily from the Great Artesian Basin under the Roxby Downs (Indenture Ratification) Act 1982. The underground copper and uranium mine commenced operations in 1988 and is expected to continue operating until approximately 2060.[citation needed]

In addition, the Basin provides water, via a 1.2 km (0.75 mi)-deep bore, for a geothermal power station at Birdsville. Water emerges from the bore at 98 °C (208 °F) and provides 25% of the town's electricity needs. After being cooled, the water is also the source of the town's drinking water.[13]

Whole of Basin management[edit]

As the Great Artesian Basin underlies parts of Queensland, New South Wales, South Australia and the Northern Territory, which each operate under different legislative frameworks, policies and resource management approaches, a coordinated "whole-of-Basin" approach to the management of this important natural resource is required.[according to whom?] The Great Artesian Basin Coordinating Committee (GABCC) provides advice from community organisations and agencies to State, Territory and Australian Government Ministers on efficient, effective and sustainable whole-of-Basin resource management and to coordinate activity between stakeholders.[5]

Membership of the Committee comprises all State, Territory, and Australian Government agencies with responsibilities for management of parts of the Great Artesian Basin, community representatives nominated by agencies; and sector representatives.[5]

Environmental concerns[edit]

There is a strong debate surrounding coal seam gas (CSG) drilling and hydraulic fracturing.[when?]

In 2011, ABC TV's public affairs program Four Corners revealed that significant concerns were being expressed about depletion and chemical damage to the Basin as a result of coal seam gas extraction. In one incident, reported in the program, the Queensland Gas Company (QGC) "fracked" its Myrtle 3 well connecting the Springbok aquifer to the coal seam below (the Walloon Coal Measures) in 2009. A local farmer was concerned that the process may have released 130 litres (29 imp gal; 34 US gal) of a potentially toxic chemical into the Basin. QGC admitted the incident, but "did not alert authorities or nearby water users about the problem until thirteen months after the incident."[14] The safety data sheet QGC had submitted for the hydraulic fracturing chemical was derived from the United States, incomplete and ten years out of date.[14]

Over thirty chemicals may be used in the process of hydraulic fracturing and their long-term impact on aquifers, agriculture and people supported by them has been quantifiable and verified for quite some time, yet largely covered up by interested parties.[15] Lead, aluminium, arsenic, barium, boron, nickel and uranium have all been found beyond recommended levels in the groundwater contaminated by CSG.[16] Instances of groundwater being contaminated and by extension poisoning the ecosystems sustained by the availability of groundwater has been widely documented, and is an exacerbating factor in regards to the population's capability to cope with drought through usage of groundwater sources in Australia.[17]

See also[edit]

References[edit]

  1. ^ "Great Artesian Basin". Water. Geoscience Australia. Retrieved 19 March 2017.
  2. ^ Spanevello, M. D. (November 2001). The phylogeny of prokaryotes associated with Australia's Great Artesian Basin (PDF) (Ph.D.). Griffith University. Retrieved 20 September 2014.
  3. ^ http://www.agriculture.gov.au/water/national/great-artesian-basin
  4. ^ a b "Underground water factsheets: Great Artesian Basin" (PDF). Department of Environment and Resource Management. Archived from the original (PDF) on 23 September 2010. Retrieved 30 September 2010.
  5. ^ a b c GABCC website Archived 7 February 2007 at the Wayback Machine
  6. ^ http://www.gabcc.org.au/tools/getFile.aspx?tbl=tblContentItem&id=96 page 40 Archived 4 February 2014 at the Wayback Machine
  7. ^ Mudd, G.M. (March 2000). "Mound springs of the Great Artesian Basin in South Australia:a case study from Olympic Dam". Environmental Geology. Springer Berlin / Heidelberg. 39 (5). doi:10.1007/s002540050452.
  8. ^ a b Harris, Colin (2002). Culture and geography: South Australia’s mound springs as trade and communication routes Archived 16 November 2005 at the Wayback Machine, Historic Environment, 16 (2), 8-11. ISSN 0726-6715.
  9. ^ a b Environmental Protection Agency (Queensland) (2002). Heritage Trails of the Queensland Outback. State of Queensland. p. 9. ISBN 0-7345-1040-3.
  10. ^ Nicol, Sally (2005). "The Great Artesian Basin: past, present and future". Water management. The State of Queensland (Department of Natural Resources and Water). Archived from the original on 15 March 2007. Retrieved 2 March 2007.
  11. ^ Ponder, Winston. Mound Springs in Arid Australia, Australian Museum.
  12. ^ Artesian springs ecological community - endangered ecological community listing - final determination, NSW Scientific Committee, Minister for the Climate Change and the Environment, New South Wales Government. Gazetted 15 June 2001. Page updated 12 February 2008.
  13. ^ "Birdsville geothermal power station (pdf)" (PDF). Queensland Sustainable Energy Innovation Fund. September 2007. Archived from the original (PDF) on 16 July 2006. Retrieved 7 January 2007.
  14. ^ a b "Farmers count cost of coal seam gas rush". ABC News. Australia. 21 February 2011. Retrieved 21 May 2011.
  15. ^ Robertson, Josh (26 May 2019). "New CSG no-go zone aimed to quarantine contaminated Queensland groundwater". ABC News. Retrieved 23 November 2019.
  16. ^ Nicholls, Sean (7 March 2014). "Santos coal seam gas project contaminates aquifer". The Sydney Morning Herald. Retrieved 23 November 2019.
  17. ^ Chan, Gabrielle (26 May 2017). "Toxic waste could endanger drinking water if Santos CSG project goes ahead – report". The Guardian. ISSN 0261-3077. Retrieved 23 November 2019.

External links[edit]