. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 10-. FIGURE 4. Size-frequency curves of sands from various environments. Curves have been dissected to indicate subpopulations. From McKinney and Friedman (1970). cumulated, it will be buried beneath further layers of A population grains. It is important to assess the relationship between Moss* rather sophisticated theory of subpopulation genesis, and the prevailing equation of transport modes with sub- population characteristics. It has been genera
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 10-. FIGURE 4. Size-frequency curves of sands from various environments. Curves have been dissected to indicate subpopulations. From McKinney and Friedman (1970). cumulated, it will be buried beneath further layers of A population grains. It is important to assess the relationship between Moss* rather sophisticated theory of subpopulation genesis, and the prevailing equation of transport modes with sub- population characteristics. It has been generally assumed [see the review by Yisher (1969)] that the contact popu- lation represents particles moved by dragging; or rolling, the framework population represents particles moving by saltation, and the interstitial population represents par- ticles traveling in suspension. There is a correlation be- tween these differing modes of transport and the per- centage of respective subpopulations in the deposit, be- cause each of these modes is most likely to carry the appropriate size of material for the subpopulations with which they have been correlated. The relative percent- ages of subpopulations, however, are a direct consequence of mechanisms of bed construction, and only indirectly reflect modes of transport. Moss has shown, for instance, that both B and A subpopulations may be generated from saltative transport alone. The percentages of these three populations in a given deposit will vary, within limits set by grain geometry and grain interaction processes, according to the regional TABLE 1. Nomenclature and Grain-Size Characteristics of Sediment Flow Regimes Population Southard and Moss (1972) Boguchwal (197 3) A Fine ripple stage Ripples Dominant Coarse ripple stage Ripples Dominant Dune stage Dunes Dominant Rheologic stage Transition Upper flat Antidunes bed Dominant Mean Diameter (Moss. 1972) Abundant Scarce Scarce Scarce Scarce Scarce Abundant Abundant mm (
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