. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography HIGH HITO«Al 0«IFI DISCHARGE FIGURE 10. Dynamic and stratigraphic models for (A) a retrograding and (B) a prograding coast during a rise in sea level. IJ coastwise sand imports are balanced by or are less than coastwise sand exports, the hydraulically maintained coastal profile must translate upward and landward by a process of gradient is perhaps originally the result of progressive sorting (see p. 162) operating on the suspended sand load of rip c
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography HIGH HITO«Al 0«IFI DISCHARGE FIGURE 10. Dynamic and stratigraphic models for (A) a retrograding and (B) a prograding coast during a rise in sea level. IJ coastwise sand imports are balanced by or are less than coastwise sand exports, the hydraulically maintained coastal profile must translate upward and landward by a process of gradient is perhaps originally the result of progressive sorting (see p. 162) operating on the suspended sand load of rip current plumes; the underlying deposit be- comes finer down the transport direction in the manner of loess or volcanic ash deposits. It is perhaps secondarily the result of adjustment to the landward increase in bot- tom orbital velocity, and to the mechanism of ripple sorting (p. 117). On retrograding coasts such as the North Carolina and Dutch coasts (Fig. 8), the lower shoreface consists of variable but generally coarser sand. It is texturally adjusted to the coastal boundary currents associated with peak flow events. This material is of negligible thickness and constitutes a residuum mantling the erod- ing surface of the underlying older deposits. Its final resting place appears to be the adjacent seafloor, where it forms a discontinuous layer up to 10 m thick (Stahl et al., 1974). Bimodal sands tend to occur at the contact between the two provinces, where the rip current fallout blanket thins to a feather edge. This contact advances down- slope during fair-weather periods of upper shoreface ag- gradation, and retreats upslope during periods of storm erosion of the entire shoreface erosion and concomitant aggradation of the adjacent seafloor (Brunn, 1962). If coastwise sand imports exceed exports, as is the case for deltaic coasts, then the profile must translate seaward and upward. Based on Curray et al. (1969). On prograding coasts, such as the western Gulf o
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