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Text / A buoyant plume adjacent to a headland-Observations ofthe Elwha River plume

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Title
A buoyant plume adjacent to a headland-Observations ofthe Elwha River plume
Alternative Title
Continental Shelf Research, 2010
Creator
Andrew W. Stevens
Jonathan A. Warrick
Date Created and/or Issued
2010
Publication Information
Elsevier B.V.
Contributing Institution
UC Riverside, Library, Water Resources Collections and Archives
Collection
Clearinghouse for Dam Removal Information (CDRI)
Rights Information
Copyrighted
Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user.
Description
Scope/Content: Abstract: Small rivers commonly discharge into coastal settings with topographic complexities-such as headlands and islands - but these settings are under represented in river plume studies compared to more simplified, straightcoasts. The Elwha River provides a unique opportunity to study the effects of coastal topography on abuoyant plume, because it discharges into the Strait of Juande Fuca on the western side of its deltaic headland. Hereweshowthatthisheadlandinducesflowseparationandtransienteddiesinthetidally dominatedcurrents(O(100cm/s)),consistentwithotherheadlandsinoscillatoryflow.Theseflow conditionsareobservedtostronglyinfluencethebuoyantriverplume,aspredictedbythe''small-scale'' or ''narrow''dynamicalclassificationusing Garvine's(1995) system. Becauseofthetransienteddiesand the locationoftherivermouthontheheadland,flowimmediatelyoffshoreoftherivermouthisdirected eastwardtwiceasfrequentlyasitiswestward.Thisresultsinabuoyantplumethatismuchmore frequently''bentover''towardtheeastthanthewest.Duringbentoverplumeconditions,theplumewas attachedtotheeasternshorelinewhilehavingadistinct,cuspatefrontalongitswesternmostboundary. The locationofthefrontwasfoundtoberelatedtothemagnitudeanddirectionoflocalflowduringthe precedingO(1h),andincreasesinalongshoreflowresultedindeeperfreshwatermixing,stronger baroclinicanomalies,andstrongerhuggingofthecoast.Duringbentoverplumeconditions,weobserved significantconvergenceofriverplumewatertowardthefrontalboundarywithin1kmoftherivermouth. Theseresultsshowhowcoastaltopographycanstronglyinfluencebuoyantplumebehavior,andthey shouldassistwithunderstandingofinitialcoastalsedimentdispersalpathwaysfromtheElwhaRiver during apendingdamremovalproject.
Scope/Content: Author affiliation: USGS
Type
text
Identifier
ark:/86086/n27p8z0n
1131
Language
English
eng
Subject
Sediment and channel dynamics
Dams
Dam retirement
Place
Elwha River, WA
Elwha Dam
Glines Canyon Dam

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