Bangor P990 Big Quilcene River Floodplain and Delta Restoration Feasibility, Fluvial and Tidal Hydrodynamic Modeling

cbec performed detailed field data collection, and 2-dimensional hydrodynamic modeling of the complex fluvial and tidal deltaic reaches of the Big Quilcene River proposed restoration site, Jefferson County, Washington.

cbec assisted the prime contractor to NAVFAC (U.S. Navy) with mitigation assessment and planning services in association with implementation of a new facility at the Bangor Submarine Base in the Hood Canal, Puget Sound, Washington.

At the Big Quilcene River and delta project site, field data collection included fluvial bedload and suspended load measurements, installation of turbidity sondes, installation of numerous stage (water level) recorders, sediment sampling of ocean bed and fluvial systems including pebble counts and grab samples, detailed single beam and multi-beam bathymetric surveys, extensive topographic surveys using RTK GPS and total station, and multiple Acoustic Doppler Current Profiler (ADCP) transects in the Quilcene Bay. cbec developed a 2-dimensional (3-D capable) hydrodynamic model to characterize fluvial, floodplain and deltaic conditions in the Big Quilcene River. cbec modeled existing conditions and performed a geomorphic assessment of this dynamic project site.

The Big Quilcene River model extends from the fluvially dominated reach (approximately 4.5 km) to the delta and surrounding Quilcene Bay.  Tidal boundary conditions for the Big Quilcene model were derived from a larger model of the Puget Sound and Hood Canal inlet system. Floodplain inundation and tidal fluxes were modeled using the Delft3D 2-dimensional hydrodynamic model.

Details

River/Watershed: Hood Canal
Project: 11-1005