Particle resuspension in the Columbia River plume near field Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/n870zs45v

Copyrighted by American Geophysical Union.

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Measurements of suspended sediment concentration, velocity, salinity, and turbulent microscale shear in the near-field region of the Columbia River plume are used to investigate the mechanisms of sediment resuspension and entrainment into the plume. An east-west transect was occupied during spring and neap tide periods in August 2005 and May 2006, corresponding to low and high river discharge conditions, respectively. During the high-discharge period the plume is decoupled from the bottom, and fine sediment resuspended from the bottom does not leave the benthic boundary layer. The primary modes of sediment transport associated with the plume are advection of sediment from the estuary and removal of sediment from the plume by gravitational settling and turbulent mixing. In contrast, the plume is much less stratified during low-discharge conditions, and large resuspension events are observed that entrained sediment through the water column and into the plume. Our measurements indicate that two factors control the magnitude and timing of sediment resuspension and entrainment: the supply of fine sediment on the seabed and the relative influence of tidal turbulence compared with buoyancy input from the river. The latter is quantified in terms of the estuary Richardson number RiE. The magnitude of vertical turbulent sediment flux is correlated with RiE during the low-flow period when there is a sufficient supply of bottom sediment in the near-field region. Such sediment resuspension may be an important mechanism for the delivery of bioavailable micronutrients to the plume during the summer.
Resource Type
DOI
Date Available
Date Issued
Citation
  • Spahn, E. Y., A. R. Horner-Devine, J. D. Nash, D. A. Jay, and L. Kilcher (2009), Particle resuspension in the Columbia River plume near field, J. Geophys. Res., 114, C00B14.
Series
Keyword
Rights Statement
Publisher
Language
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Sue Kunda(sue.kunda@oregonstate.edu) on 2010-07-22T20:30:56Z (GMT) No. of bitstreams: 1 Spahn_et_al_JGR_2009.pdf: 1851244 bytes, checksum: 96676f2c7fb64debc53e8e9b9871a1c4 (MD5)
  • description.provenance : Made available in DSpace on 2010-07-22T20:30:56Z (GMT). No. of bitstreams: 1 Spahn_et_al_JGR_2009.pdf: 1851244 bytes, checksum: 96676f2c7fb64debc53e8e9b9871a1c4 (MD5) Previous issue date: 2009-11-24
  • description.provenance : Submitted by David Moynihan (dmscanner@gmail.com) on 2010-07-22T17:27:06Z No. of bitstreams: 1 Spahn_et_al_JGR_2009.pdf: 1851244 bytes, checksum: 96676f2c7fb64debc53e8e9b9871a1c4 (MD5)

Relationships

Parents:

This work has no parents.

Last modified

Downloadable Content

Download PDF

Items