Laboratory and Numerical Studies of Hydrodynamics Near Jetties
ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS
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Numerical and physical modeling studies were performed by the Coastal Inlets Research Program CIRP of the U.S. Army Corps of Engineers to investigate the spatial and temporal behavior of waves and wave-induced currents near jetties of an idealized coastal inlet. Hydrodynamics were examined in the vicinity of two extreme types of jetty structure a highly absorbing jetty resembling fairly porous rock rubble structure and a fully reflective jetty resembling a vertical sheet pile or caisson type breakwater. Laboratory experiments in a Froude scale of 150 were conducted with regular and irregular shore-normal 0 deg and obliquely incident 20 deg unidirectional waves. Current and wave measurements were made on the up-wave side and inside the inlet as well as in the bay, along a number of cross-shore and along-shore transects. Wave directions were measured by a remote-sensing video-camera system and Acoustic Doppler Velocimeters ADV. Numerical modeling was performed with the Coastal Modeling System CMS consisting of a two-dimensional circulation model coupled to a spectral wave model. Calculated current and wave fields from CMS in the area around and between absorbing or reflected jetties were compared to measurements. The highly reflecting jetty created a circulation cell on the up-wave side of the inlet, whereas the absorbing jetty did not.
- Operations Research
- Civil Engineering
- Fluid Mechanics