Geomorphic and hydrologic conditions for cold pool formation on Redwood Creek, California
Ozaki VL. 1987. Geomorphic and hydrologic conditions for cold pool formation on Redwood Creek, California. Pages 415-416. In Beschta RL, Blinn T, Grant GE, Swanson FJ, Ice GG: Erosion and sedimentation in the Pacific Rim. Corvallis, OR. August 3-7, 1987. IAHS. Wallingford, UK
Excerpts: "Widespread streambed aggradation in Redwood Creek, [in coastal northern California], during the last few decades severely impacted important nursery habitat for anadromous fish stocks. Aggradation caused decreased pool volumes, elevated mainstem temperatures, and loss of riparian vegetation and streamside canopy. Although few in number, cold pools on Redwood Creek provide quality summer rearing habitat and holding areas for juvenile fish and migrating adult anadromous fish. Favorable pool morphology and contribution of cold effluent groundwater and intragravel flow have been identified by Moses (1984) as important to cold pool formation. However, little research has been done to quantify or verify these observations. The objective of this study was to investigate the physical processes responsible for controlling and maintaining summer cold pools on Redwood Creek. The study focused on the relationship of temperature structure and mixing to pool morphology, and the occurrence and relationship of the cold water sources. Five pools were studied in the lower 21 km of the 108 km long main channel of Redwood Creek. Detailed morphologic and topographic maps were made of each pool. In addition, surface and subsurface water discharges and the spatial distribution of water temperatures throughout the pools were quantified. Channel morphology strongly influenced the occurrence and development of cold pools. Woody debris in pools provided shading, cover, and in some cases retarded mixing."
- Type
- Conference Proceeding Paper
- Authors
- Ozaki, Vicki
- Units
- REDW
- Keywords
- Channel Morphology, cross sections, Geomorphology, Hydrology, Physical Processes, pool formation, Pools, Redwood Creek, temperature structure, Water Discharge, Water Sources, Water Temperature, Woody Debris