geographic characteristics of sub regions in the mdb
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Geographic Characteristics of sub regions in the MDB. Sub Regions in the MDB. Key Skills and knowledge. Definition of a region Identification and classification of selected regions. The upper Darling. Majority of Australia's Cotton Industry - PowerPoint PPT PresentationTRANSCRIPT
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Geographic Characteristics of sub regions in the MDB
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Sub Regions in the MDB
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Key Skills and knowledge
•Definition of a region
• Identification and classification of selected regions
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The upper Darling• Majority of Australia's Cotton Industry
• 91% located along tributaries of the upper darling
Balonne River
Upper Darling
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The Lower Darling
• Arid
• 6 million Hectares
• Native Vegetation (Mallee, salt bush, red gum)
• Mungo National Park, Walls of china, Willandra
lakes World Heritage Area provide records of
Indigenous life
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The Lower Darling cont..
Mungo National Park Wine grapes
Menindee lakes store water for irrigation and for Broken hill Pleistocene human footprints –
Willandra Lakes
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Lower Darling Cont…
Produce Includes • Wheat• Cotton• Vegetables • Wool • Meat• Wine grapes• Stone fruits• Apples
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The upper Murray
• The Murray begins its 2375 km journey
• three springs south of Mt Kosciusko
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Upper Murray cont…
The Hume Dam
• This sub region makes up less than 2% of
the Murray Darling catchment
• But contributes 37% of the rivers total
flow• Hume and
Dartmouth Dams control flow and generate hydro electricity
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The Riverine Plains
• Flat
• Sediment eroded from
the Great dividing
Range and deposited
• Cadell tilt block changed the course of the rivers and helped produce Australia's largest red gum forest (Barmah)
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Riverine plains cont…
Barmah Forest
• Barmah forest occupies 60 000 hectares
• Shepparton and Cobram orchards produce
80% of Australia's canning fruit • Rice is grown in
Deniliquin and Wakool regions
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The Mallee zone and the Riverland / Sunraysia region
• Murrumbidgee and
Darling rivers join the
Murray
• Semi Arid region
• Sandy soils, dunes, slat
lakes, shrubs, sparse
distribution of trees
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The Mallee, Riverland, Sunraysia region cont…….
Confluence of Murrumbidgee and darling rivers
• Ancient sea deposited large amounts of
salt, present in soil and ground water
• Extensive Irrigation allows:• Grapes• Citrus fruits• Stone fruit• Flowers• Vegetables
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The Murray Gorge• River has cut through
Hard limestone
• The Valley is 1.5 -2 km
wide
• 30 – 40 meters deep
• Vertical cliffs and
elongated wetlands
border
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The Murray Gorge cont…
• The gorge is approximately 280 km long
• The regional water table and river
intersect
• Salty water enters the river through
aquifers exposed in the cliff face
• The river turns sharply at Morgan
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The lower Murray, the lower lakes and the Coorong
• Wetlands have been
drained and reclaimed
for pasture and dairying
• At Goolwa, barrages
prevent salt water from
extending upstream
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The lower Murray, the lower lakes and the Coorong cont….
• The barrages also keep water levels high
enough for irrigation
• The river enters the lower lakes and finally
the southern ocean
Mouth of the Murray and the Coorong
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The Coorong
• Some water flows into the Coorong
• The Coorong is a 140 km lagoon behind
the coastal dunes