. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography AUTOCHTHONOUS PATTERNS OF SEDIMENTATION 329 75°48' /S' • / I • • • •. 36°32' SIZE CLASS COARSE SAND MEDIUM SAND CLASS % VOLUME BOUNDARIES EXCEEDENCE TRANSPORT jFINE SAND jVERY FINE J SAND (PHI) 0-1 1-2 2-3 3-4 (m3/m/T) 75 30 u u 20 S 10 CURRENT METER STATION • STATIONS J NET TRANSPORT DIRECTION 12 16 DAYS 20 24 28 FIGURE 19- Sediment transport in response to the unidirectional component offlow during the month oj No
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography AUTOCHTHONOUS PATTERNS OF SEDIMENTATION 329 75°48' /S' • / I • • • •. 36°32' SIZE CLASS COARSE SAND MEDIUM SAND CLASS % VOLUME BOUNDARIES EXCEEDENCE TRANSPORT jFINE SAND jVERY FINE J SAND (PHI) 0-1 1-2 2-3 3-4 (m3/m/T) 75 30 u u 20 S 10 CURRENT METER STATION • STATIONS J NET TRANSPORT DIRECTION 12 16 DAYS 20 24 28 FIGURE 19- Sediment transport in response to the unidirectional component offlow during the month oj November 1972, in an inner shelf ridge field, False Cape, Virginia. Estimates based on Shield's threshold criterion, a drag coeffi- cient of i X 10~3, and Laursen's (2958) total load equation. Values expressed as cubic meters of quartz per meter transverse to transport direction for time elapsed. Solid line is the 10 m isobath. commonly as linear erosional furrows. They may trend parallel to the trend of the ridge topography, or may cut across it, so as to make a larger acute angle with the shoreline (Fig. 22). Toward the southern end of the Middle Atlantic Bight, the shelf surface shoals, narrows and curves to the east. Sand wave fields appear, perhaps indicative of the acceleration of storm flows in response to the decreasing cross-sectional area of the shelf water cokimn. Ridges molded into the Albermarle shoal retreat massif bear sand waves on their crests (Fig. 23). Sand waves locally attain 2 m heights and angle of repose slopes. Sand wave crestlines are not quite normal to shore, suggesting that the ridge crests on which they are found experience a seaward component of flow during storms. At Diamond Shoals, the southern extremity of the Middle Atlantic Bight, sand waves up to 7 m high occur between sand ridges, forming a reticulate pattern (see Fig. 27, Chapter 16). Grain-size patterns in the Middle Atlantic Bight suggest that the storm flows that interact wi
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