Bar-pool morphology in rivers can provide vital habitat to aquatic species, notably salmonids, which require gravel riffles to bury eggs and pools for hydraulic and cold-water refuge. In some cases, the erosion and subsequent deposition of coarse sediment downstream of a dam removal can modify habitat by inundating bar-pool structure,...
Floodplain forests play many important roles in the fluvial processes and environments of large alluvial rivers, including acting as geomorphological influences and habitat for native fish during high flows. Many large, gravel-bed river systems have undergone substantial change in recent centuries, resulting in loss of forested area to agriculture, reduction...
The one-dimensional numerical model developed by Carl R.
Goodwin is applied to the Siuslaw estuary. Vertical displacement,
horizontal velocity and flow of the water as a function of time and
distance from the mouth given by the model are compared with field
observations taken under different water mixing conditions in...
Time trends in flow and channel characteristics were evaluated for the Middle Fork Willamette (MFW) River, which drains a 668 km2 forested watershed in the Cascade Mountains of western Oregon. Timber
production is the primary land use in the watershed. Analysis of precipitation and peak flow data from 1959 to...
The lower Willamette River, located between river mile 4.0
and 26.5, is the most seriously polluted section of the Willamette
River Basin.
Low dissolved oxygen concentrations of 2.0 to 3.0 mg/1 are
observed annually in this section of the river due to the pollutional
loads discharged into it. Waste discharges...
Effects of habitat and season on guild structure of avian
communities were examined for islands in the estuary zone of the
Columbia River, Oregon. Bird species were classified into guilds
according to their major food item, typical foraging substrate, and
foraging behavior. Variation in community structure indices (number of
guilds,...