Characterization of the vertical structure of tidal currents in the Mouth of the Columbia River and evaluation of the SELFE model
Oxendine, Joseph R.
Herbers, Thomas H. C.
Janssen, Tim T.
MetadataShow full item record
Lack of measurements has led to a poor understanding of tidal currents within the Mouth of the Columbia River (MCR). Shipboard ADCP measurements are a technically viable means to measure these currents and their vertical structures. Shipboard ADCP measurements from a three-week long cruise conducted by the R/V Point Sur are used in this study. Transects along the main shipping channel and across the bar were extracted using criteria of constant speed and heading. Vertical sections from each transect were compared with predictions from the SELFE model in order to evaluate the models’ ability to predict these currents. Observed flood currents within the river are bottom intensified with slight river outflow at the surface early in the flood cycle. Complete reversal of the flow throughout the column is experienced later as the flood fully develops. Ebb currents are much stronger and more homogenous throughout the water column due to the combination of river outflow and tidal current. Inside the river mouth, the SELFE model agrees qualitatively well with observations, with only a few discrepancies. Outside the river mouth, the SELFE model does not resolve the observed vertical structure, possibly due to coarse grid resolution and limited observational input.
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
An investigation of diurnal variability in wind and ocean currents off Huntington Beach, California Taylor, Kelly E. (Monterey, California. Naval Postgraduate School, 2003-03);In conjunction with the Huntington Beach Phase III Investigation, the diurnal variability in the wind and ocean currents from July 1 - October 12, 2001 over the San Pedro Shelf is investigated. Results suggest that the ...
Cushanick, Matthew Stephan (Monterey, California. Naval Postgraduate School, 2005-06);Accurate prediction of nearshore waves and currents is of critical importance in littoral naval operations. This study examines the effects of complex bathymetry on nearshore currents. Data collected by an array of 12 ...
Characterization of the vertical structure of tidal currents in the Golden Gate (San Francisco) inlet Khalid, Muhammad (Monterey, California. Naval Postgraduate School, 2012-12);In the Golden Gate (San Francisco) inlet, tidal currents are dominant and have complex spatial and temporal variations owing to the large size of estuary connected through a narrow channel and the shallow ebb shoal (bar) ...