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Full-Text Articles in Medicine and Health Sciences
Anabranching And Maximum Flow Efficiency In Magela Creek, Northern Australia, John D. Jansen, Gerald C. Nanson
Anabranching And Maximum Flow Efficiency In Magela Creek, Northern Australia, John D. Jansen, Gerald C. Nanson
Faculty of Science, Medicine and Health - Papers: part A
[1] Anabranching is the prevailing river pattern found along alluvial tracts of the world's largest rivers. Hydraulic geometry and bed material discharge are compared between single channel and anabranching reaches up to 4 times bank-full discharge in Magela Creek, northern Australia. The anabranching channels exhibit greater sediment transporting capacity per unit available stream power, i.e., maximum flow efficiency (MFE). Simple flume experiments corroborate our field results showing the flow efficiency gains associated with anabranching, and highlight the prospect of a dominant anabranch, which is found in many anabranching rivers. These results demonstrate that anabranching can constitute a stable river pattern …
Geomagnetic Activity Forcing Of The Northern Annular Mode Via The Stratosphere, Daniel Palamara, Edward Bryant
Geomagnetic Activity Forcing Of The Northern Annular Mode Via The Stratosphere, Daniel Palamara, Edward Bryant
Faculty of Science, Medicine and Health - Papers: part A
We consider various aspects of the link between solar-modulated geomagnetic activity and the Northern Annular Mode (NAM). Our results indicate that the geomagnetic forcing of atmospheric circulation in the Northern Hemisphere is temporally and seasonally restricted, modulated by the Quasi-Biennial Oscillation (QBO), and reliant on stratosphere-troposphere coupling. When the data are restricted to January values after 1965, for years in which the January QBO is eastwards, the correlation coefficient between the geomagnetic AA index and the NAM is 0.85. These results can account for many of the enigmatic features of Northern Hemisphere circulation.