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Glacial buzz-saws, gold in fool's gold, fingerprints in sea water, and fluvial iron
Date:10/19/2013

weakens the lower plate. Therefore, along-strike transfer of shortening from one plate to the other appears to be a manifestation of along-strike changes of rheology deep in the crust.


Altered regional sediment transport regime after a large typhoon, southern Taiwan
Michelle Y.-F. Huang, Research Center for Environmental Changes, Academia Sinica, Taipei 115, Taiwan; michelleyfhuang@gmail.com; ae2612@hotmail.com. Co-author: David R. Montgomery, Department of Earth and Space Sciences, University of Washington, Seattle, Washington 98195-1310, USA. Posted online ahead of print 16 Oct. 2013; http://dx.doi.org/10.1130/G34826.1.

Analyses of river-suspended sediment response to record-breaking regional rainfall in southern Taiwan during typhoon Morakot, 7-9 August 2009, reveal systematic changes in the regional sediment transport regime as characterized by rating curve parameters. These changes result in much greater sediment concentration, and thus sediment transport, in subsequent low-flow events after the typhoon, an effect that amplifies and extends the influence of such extreme events through increased low-flow sediment transport. Findings by Michelle Huang and David Montgomery show that the rating curve exponent is not constant contrasts with the conventional assumption that large events influence sediment yields through increased intercept values, thereby supporting the interpretation that basin sediment delivery influences both rating parameters, and increases post-event low-flow sediment transport. Surveys of landslide density and riverbed grain sizes before and after typhoon Morakot support the interpretation that the observed changes reflect an altered sediment transport regime and a shift from channel migration and bank erosion to reworking of landslide debris and enhanced b
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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