Impact of Debris-Flow Deposits on Hydrogeochemical Processes and the Developement of Dryland Salinity in the Yass River Catchment, New South Wales, Australia

1997 ◽  
Vol 5 (4) ◽  
pp. 71-88 ◽  
Author(s):  
J. Jankowski ◽  
R. Ian Acworth
Keyword(s):  
Debris Flow ◽  
New South ◽  
New South Wales ◽  
Hydrogeochemical Processes ◽  
Dryland Salinity ◽  
River Catchment ◽  
South Wales

Salt source for dryland salinity - evidence from an upland catchment on the Southern Tablelands of New South Wales

Soil Research ◽  
2001 ◽  
Vol 39 (1) ◽  
pp. 39 ◽  
Author(s):  
R. I. Acworth ◽  
J. Jankowski
Keyword(s):  
New South ◽  
New South Wales ◽  
Dust Storms ◽  
Dryland Salinity ◽  
Heterogeneous Distribution ◽  
Small Catchment ◽  
South Wales ◽  
Bedrock Weathering ◽  
Salt Distribution ◽  
The Last Glacial

A detailed study involving drilling, geophysics, hydrogeochemistry, and groundwater monitoring over a 10-year period has been carried out at a small catchment south-east of Yass on the Southern Tablelands of New South Wales to investigate the source of salt causing dryland salinity. The catchment is within 2 km of the top of a regional groundwater and surface water divide and remains substantially tree covered. The investigations have found a highly heterogeneous distribution of salt, most of which is associated with swelling clay. Dispersion of this clay causes the surface features commonly associated with dryland salinity. There is no hydrogeochemical evidence to suggest evaporative or transpirative concentration of salt in the groundwater. The short flow path from the top of the catchment cannot provide a significant source of salt from bedrock weathering. An alternative model of salt accumulation is proposed with the salt imported into the catchment with silt during dust storms in the arid and windy conditions during the last glacial. The management implications of this model of salt distribution and the associated dryland salinity development are discussed.

Distribution of the Platypus (Ornithorhynchus anatinus) in the Bombala River Catchment, South-Eastern New South Wales.

1998 ◽  
Vol 20 (2) ◽  
pp. 251
Author(s):  
R.W. Turnbull
Keyword(s):  
New South ◽  
New South Wales ◽  
River Catchment ◽  
South Eastern ◽  
South Wales ◽  
Ornithorhynchus Anatinus ◽  
The Difference

Distribution of the platypus (Ornithorhynchus anatinus) in the Bombala River catchment in south-eastern New South Wales was surveyed using questionnaires. Platypuses were reported from all streams in the catchment. The majority of positive sightings were from downstream areas whereas very few positive sightings were reported from headwater areas. The difference between frequencies of headwater and downstream reports of sightings was significant. The platypus was considered common throughout the catchment.

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