HR: 1340h
AN: H43A-0365 [Abstracts]
TI: A Sediment Transport Based Geomorphic Analysis of the Skykomish River Braided Reach to Identify
"Restoration" Opportunities
AU: * DeVries, P
EM: pdevries@r2usa.com
AF: R2 Resource Consultants, 15250 NE 95th St, Redmond, WA 98033
United States
AU: Aldrich, R
EM: Bob.Aldrich@co.snohomish.wa.us
AF: Snohomish County Surface Water Management, 2731 Wetmore Ave
Suite 300, Everett, WA 98201
United States
AU: Brunzell, S
EM: suzy.brunzell@co.snohomish.wa.us
AF: Snohomish County Surface Water Management, 2731 Wetmore Ave
Suite 300, Everett, WA 98201
United States
AU: Purser, M
EM: Michael.Purser@co.snohomish.wa.us
AF: Snohomish County Surface Water Management, 2731 Wetmore Ave
Suite 300, Everett, WA 98201
United States
AB:
A study is underway to assess the driving sediment transport and hydraulic processes influencing channel changes in a braided
reach of the Skykomish River, Washington. The reach is located below a steeper, confined section of the river and has
likely been geomorphically active since the last glaciation. Bankfull widths range between roughly 100-350 m within, and
drainage area is 1,500 km2 above, the study reach. Analyses have been conducted at the reach scale, and include development
of a sediment transport model, historical photograph and survey overlays, and an accounting of where sediment deposition,
channel shifts and avulsions, and side channel connection are most and least likely to occur over reasonable design life
spans (e.g., between 10 and 50 years). The ultimate goal of the analysis is to identify suitable locations for projects that
will enhance, restore, or protect fish habitat as well as protect infrastructure, while considering constraints posed by
channel hydraulic, sediment transport/deposition, and stability characteristics. Our strategy is to determine what types of
projects are best suited for different locations in the reach based on the analysis results. The results can then be used to
prioritize and estimate costs for project alternatives.
DE: 1815 Erosion and sedimentation
DE: 1824 Geomorphology (1625)
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting