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GLIN==> Seminar Announcement (Modeling of Sedimentation) - Ann Arbor, MI



Posted on behalf of David Reid <david.reid@noaa.gov>

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NOAA GREAT LAKES SEMINAR SERIES

SEMINAR ANNOUNCEMENT
WHEN: WEDNESDAY, FEBRUARY 6, 2002
TIME: 10:30 A.M.
TITLE: MODELING OF SEDIMENTATION AT RIVER DELTAS, WITH APPLICATION TO THE
NEMADJI RIVER AT LAKE SUPERIOR

SPEAKER: Gary Parker (Sea Grant scientist)
St. Anthony Falls Laboratory, University of Minnesota, Minnesota Sea Grant

WHERE: GLERL Main Conference Room
2205 Commonwealth Blvd.
Ann Arbor, MI 48105

ABSTRACT: Deltas flowing into lakes and reservoirs have long been
characterized
in terms of coarse topset and foreset deposits and fine bottomset deposits.
Yet to date remarkably little effort has been expended to model these
features
in a mechanistic way. The Nemadji River as it flows into Lake Superior
provides an example of such a delta, with the topset and foreset consisting
mostly of the ten percent of the delivered sediment that is sand, and the
bottomset consisting mostly of the ninety percent that is mud (silt or
clay). The topset deposit is emplaced by fluvial deposition, and the foreset
by avalanching. The bottomset deposit is emplaced by either rainout from
a surface plume or a plunging turbidity current. A moving-boundary numerical
model of deltas which captures these features is presented and used to
study various scenarios of lake sedimentation.

CONTACT: Dr. Rochelle Sturtevant, NOAA/GLERL, 734-741-2287



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