. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography I m/sec \dMAikl. 1â, ^ â 1 u- 0 5 10/24/72 25 30 11/23/72 Fig. 18.âA: 6-h vectors of winds at the Chesa- peake Light during November 1972. B: 6-h vectors of current measured 37 cm off the seafloor at False Cape by a Geodyne (Savonius rotor) meter. See Fig. 10 for location. C: Speed-time plot of current meter record. Height of vertical bars indicates percent of fine sand transport occurred during this particular threshold exceedence event; width of v
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography I m/sec \dMAikl. 1â, ^ â 1 u- 0 5 10/24/72 25 30 11/23/72 Fig. 18.âA: 6-h vectors of winds at the Chesa- peake Light during November 1972. B: 6-h vectors of current measured 37 cm off the seafloor at False Cape by a Geodyne (Savonius rotor) meter. See Fig. 10 for location. C: Speed-time plot of current meter record. Height of vertical bars indicates percent of fine sand transport occurred during this particular threshold exceedence event; width of vertical bars indicates duration of threshold as compared with total trans- port during duration of record. Transport is talcen as proportional to the cube of the velocity in excess of threshold See text. However, if the storm nests in the Middle Atlantic Bight for an appreciable period of time so that isobars of atmospheric pressure parallel the isobaths of the shelf surface (scale-matching storm), then the winds blow down the arc o+" he shelf. Landward Ekman transport of water results in 40 to 60 cm of coastal setup, and strong geostrophic coupling between wind and water results. Coherent southward water transport with mid-depth velocities in excess of 35 cm/sec may be sustained for hours or days. Boicourt and Hacker (1976) have examined in some detail the barotropic response of the water col- umn in the study area to strong northerly wind forcing during the storm of February 3-5, 1974. The most notable feature is a "wind- driven outflow surge of low salinity water from Chesapeake Bay which forms a south- ward flowing, high velocity jet along the Vir- ginia and North Carolina ; In addition to the strong downshelf flow, Boicourt and Hacker observed cross-shelf components of velocity up to 13 cm/sec. These are larger than necessary to account for setup against the coast, and suggest a return flow "perhaps in a bottom Ekman
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