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Influence of logjam-formed hard points on the formation of valley-bottom landforms in an old-growth forest valley, Queets River, Washington, USA

Published online by Cambridge University Press:  20 January 2017

David R. Montgomery  and
Tim B. Abbe
David R. Montgomery*
Affiliation:
Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195, USA
Tim B. Abbe
Affiliation:
Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195, USA
*
*Corresponding author.Email Address:dave@ess.washington.edu(D.R. Montgomery)
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Abstract

Field surveys and radiocarbon dating of buried logjams in the floodplain of an old-growth forest river demonstrate the formation of erosion-resistant “hard points” on the floodplain of the Queets River, Washington. These hard points provide refugia for development of old-growth forest patches in frequently disturbed riparian environments dominated by immature forest. Our surveys show that local bed aggradation associated with logjams not only influences channel patterns and profiles but leads to development of a patchwork of elevated landforms that can coalesce to form portions of the valley bottom with substantial (i.e., 1 to > 4 m) relief above the bankfull elevation. In addition, logjam-formed hard points promote channel avulsion, anastomosing morphology, and growth of mature patches of floodplain forest that, in turn, provide large logs needed to form more logjam-formed hard points. Hence, our findings substantiate the potential for a feedback mechanism through which hard points sustain complex channel morphology and a patchwork floodplain composed of variable-elevation surfaces. Conversely, such a feedback further implies that major changes in riparian forest characteristics associated with land use can lead to dramatic simplification in channel and floodplain morphology.

Keywords

Woody debrisFluvialFloodplainTerracesLogjamsAggradation
Type
Original Articles
Information
Quaternary Research , Volume 65 , Issue 1 , January 2006 , pp. 147 - 155
Copyright
University of Washington

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Footnotes

1 Present address: Herrera Environmental, Inc., 2200 Sixth Avenue, Suite 1100, Seattle, WA 98121, USA.

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