. Raccolte le ristampe / Atlantic oceanografia e laboratori meteorologici [e] Pacifico laboratori oceanografici. Oceanografia periodici.. 46 Geological Society of American Bulletin 88, 299-311. Ripiano costruttiva della topografia, Diamond barene, Nord Atlantico CaroHna oceanografia e laboratori meteorologici, è Rickenbacker Causeivay, Miami, Florida 3M49 Robert E. HUNT DONALD J. P. SWIFT HAROLD PALMER Dames e Moore. Inc., 7101 Wisconsin Avenue. Washington, DC, 20014. La figura 1. A. regionali di batimetria di Carolina Nonh costa, che indica l'area di studio. Contorni in piedi. B. Relationshi

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. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Periodicals.. 46 Geological Society of American Bulletin 88, 299-311. Constructional shelf topography, Diamond Shoals, North CaroHna Atlantic Oceanographic and Meteorological Laboratories, IS Rickenbacker Causeivay, Miami, Florida 3M49 ROBERT E. HUNT DONALD J. P. SWIFT HAROLD PALMER Dames and Moore. Inc., 7101 Wisconsin Avenue. Washington, D.C., 20014. Figure 1. A. Regional bathymetry of Nonh Carolina coast, indicating study area. Contours in feet. B. Relationship of outer shelf ridge topography (o Diamond Shoals. Arrows indicate mean annual littoral drift in millions of cubic yards per year. Ridges are stippled; lows are ruled. Contours in feet. From Swift and others (1972). ABSTRACT The surficial sand sheet seaward of Diamond Shoals on the North Carolina shelf is molded into a series of coast-parallel ridges as much as 10 m high and 5 km apart. An older cohesive substrate is ex- posed in the troughs. Fields of sand waves as much as 7 m high occur on the ridges and in the troughs. Their crests are normal to the ridges. Sand size varies across the sea floor in sympathy with the ridge topog- raphy. The gently inclined landward flanks are coarser grained; the steeper seaward flanks are finer grained. There is evidence to indicate that the sand ridges, like the sand waves with which they are associated, are responses to flow. However, it is not possible to demonstrate the nature of coupling between fluid motion and substrate morphology on the basis of the existing data. The landward part of the study area is subjected to a southward water drift that during winter is punctuated by intense southward pulses associated with storms. The seaward part experiences a strong, predommantly northward flow throughout most of the year, and the zone of shear ap- pears to migrate back and forth across the study area. Regional considerations suggest a sou

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