. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 0 12 3 PHI SCALE 4 - 15FEET â - 99 I PREDOM : SHELL i 90 50 10 1 0 1 LOW TIDE. FOREST BEACH S. FIGURE 11. Representative size frequency distributions of the shoreface. From Visher (i969). bution. A large C population is characteristic of Moss' rheologic regime; the B population, however, is less than 1%. While the hydraulic microclimate of rheologic flow is conducive to the incorporation of a large B popu- lation into the bed, such a response is
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 0 12 3 PHI SCALE 4 - 15FEET â - 99 I PREDOM : SHELL i 90 50 10 1 0 1 LOW TIDE. FOREST BEACH S. FIGURE 11. Representative size frequency distributions of the shoreface. From Visher (i969). bution. A large C population is characteristic of Moss' rheologic regime; the B population, however, is less than 1%. While the hydraulic microclimate of rheologic flow is conducive to the incorporation of a large B popu- lation into the bed, such a response is presumably in- hibited by the gross hydraulic structure of the surf zone; suspended fines are steadily flushed seaward through rip channels. Two framework (A) populations are locally present, reflecting perhaps discrete responses to swash and the slightly higher backwash velocities. Subtidal surf zone populations (5 and ft) are similar, but the framework population is better sorted (corresponding segment of the cumulative curve is steeper). This sorting is further improved in the upper foreshore sample (11 ft sample). This sample has a reduced contact (C) popu- lation and an enriched interstitial (B) population. B pop- ulation enrichment reflects the heavy rip current fallout of fine suspended sand experienced at this depth, and perhaps also the presence of Moss's fine ripple regime. BED FORMS OF THE SHOREFACE. CliftOn et al. (1971) have noted that the high-energy shoreface of southern Oregon is characterized by zones of primary structures that reflect the hydrodynamic subenvironment (Fig. 12). An "inner planar facies" occurs beneath the reversing supercritical flows of the swash zone; the associated structure within the deposit consists of thin beds and laminae of gently inclined sand. The rhomboid ripple marks and antidunes that form in each backwash are rarely preserved. Beneath the surf zone of gently sloping beaches lies an "inner rough facies" of
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