Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/7622
Title: Flow table study of Cook Inlet, Alaska
Authors: University of California, Berkeley. Department of Civil and Environmental Engineering
Hughes, Steven A.
Pizzo, Gian-Marco
Keywords: Alaska
Alaska District
Cook Inlet
Flow table
Physical model
Geometrical distortion
Port of Anchorage
Publisher: Coastal and Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: ERDC/CHL TR ; 03-6.
Description: Technical report
Complex flow patterns in upper Cook Inlet in the vicinity of the Port of Anchorage were simulated using a flow table. Initially, two idealized models of the inlet were constructed with terraced layers representing the bathymetry. Encouraging test results prompted construction of a model with three-dimensional bathymetry. Both ebb and flood maximum tide flows could be examined by reversing the models on the flow table. The intriguing flow patterns of Cook Inlet were visualized using floating particles and by dye injection. Strong horizontal and vertical mixing was evident through the model, particularly in the lee of headlands. The flow table models indicated that deposition of fine sediment at the Port of Anchorage may be caused, in part, by ebb flow separation at the upstream Cairn Point that creates a low-flow region at the port. Experimentation with the models also provided insight into potential improvements to dredge material disposal practices. Theoretical analyses examined potential turbulence scale effects caused by geometric model distortion, and extensive experiments were conducted on the flow table to gauge the scale effects. Various jet flow geometries were tested at different model distortions, and velocity measurements in the region of flow separation were co mpared and evaluated. Results indicated that turbulence generated by vertical edges and manifested primarily in the horizontal plane had no distorted models where the vertical and horizontal turbulence had similar strength such as occurs with flow separation at a sloping edge. The difference was most noticeable near the bottom, whereas comparisons near the free surface were reasonable. The scale effect appeared to be localized around the boundary of the jet.
URI: http://hdl.handle.net/11681/7622
Appears in Collections:Technical Report
Technical Report

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