US Army Corps of Engineers
Portland District

Process overview: sediment supply and trapping

Map showing affected sediment supply and trapping areaSediment supply and trapping refers to the dynamics of particulate organic matter, including drift and other geomorphological changes (i.e., bathymetric structure).

 

The top figure shows total sediment load in the Columbia estuary at Vancouver for observed flow, 1878-1999 (Log10) (Jay 2003).

 

The bottom figure shows net sediment accretion and erosion rates (cm/y) in the lower Columbia estuary between 1868 and 1958 (Sherwood et al. 1990).

 

Color chart showing total sediment load in the Columbia River Estuary for observed flowStructures that affect sediment supply and trapping:

  • Deep channel
  • Emergent marsh
  • Mud / sand flats
  • Scrub-shrub forest
  • Shallow slope
  • Submerged aquatic vegetation  

Sediment supply and trapping refers to the dynamics of particulate organic matter, including drift and other geomorphological changes (i.e., bathymetric structure).

Ecosystem functions that are affected by sediment supply and trapping:

  • Flood attenuation

Interactions and equations:

Contact information

Ronald Thom, Ph.D
360-681-3657

Marine Research Operations, PNNL
1529 W. Sequim Bay Rd.
Sequim, WA 98382