US Army Corps of Engineers
Portland District

Columbia River Estuary model components

Click any component to navigate to that section

Graphical depiction of the various elements in the estuary systemYou can also navigate using the text links below:

Stressors:

  1. Agriculture
  2. Diking
  3. Dredging
  4. Extreme climatic events
  5. Filling
  6. Flow regulation
  7. Logging
  8. Marinas and overwater structures
  9. Seismic activity
  10. Shoreline armoring
  11. Urbanization
  12. Volcanic activity
  13. Wastewater discharges
  14. Water diversion

 

Controlling factors: 

Ecosystem-complex structure

Ecosystem-complex processes

Ecosystem-complex functions 

1. Currents  1. Deep channel  1. Element cycling  1. Aesthetics and recreation
2. Elevation / depth / bathymetry  2. Emergent marsh  2. Food web support  2. Avifauna production
3. Hydrodynamics  3. Mud / sand flat  3. Primary production  3. Biodiversity maintenance

4. Light

 4. Plankton  4. Refuge  4. Flood attenuation
5. Nutrients

 5. Scrub-shrub forested flow wetland

 5. Reproduction  5. Other fish production
6. Salinity  6. Shallow slope  6. Sediment supply and trapping  6. Salmonid production
7. Sediment quality  7. Submerged aquatic vegetation  7. Successful development  7. Water quality maintenance
8. Temperature    8. Water storage  8. Wildlife production
9. Turbidity      

Contact information

Ronald Thom, Ph.D
360-681-3657

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