Physics
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30qoce7l&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 17, pp. OCE 7-1, CiteID 1897, DOI 10.1029/2003GL018087
Physics
1
Oceanography: General: Analytical Modeling, Oceanography: Physical: Turbulence, Diffusion, And Mixing Processes, Oceanography: Physical: Surface Waves And Tides (1255)
Scientific paper
Bottom drag coefficient is usually estimated from vertical structures of horizontal flows. Analytic models have demonstrated that bottom friction causes cross channel variations of velocity such that the amplitude of the along channel velocity increases with depth, and the velocity in shallow water has a phase lead, i.e. flood and ebb occur earlier in shallow water along the same cross channel transect. Based on these facts, we have developed a simple method to estimate the drag coefficient using lateral flow structure. The method is verified by data from a vessel-towed acoustic Doppler current profiler (ADCP) in unstratified tidal channels of Georgia, US. The cross channel average of the drag coefficient is 4.55 × 10-3 (1 +/- 18.6%), a reasonable value compared to previous results.
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