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Book Chapter

Model

Published:
January 01, 1987

Abstract

Each of the images created for this publication is the result of a geometry experiment conducted by computer. For each experiment, the code uses a list of parameters that define the morphology and behavior of a particular bedform or assemblage of bedforms. The parameters specified for each experiment include the spacing, steepness, asymmetry, migration direction, migration speed, plan-form shape, and along-crest migration speed of plan-form sinuosities of each set of bedforms (Appendix A). Because bedform morphology and behavior can vary through time, the code is capable of varying most of these parameters cyclically through time; the magnitude, period, and phase of variations in any changing parameter must be specified. Specifying these parameters for as many as three sets of simultaneously or alternately active bedforms, specifying how the various bedforms are to be superimposed, specifying the rate of deposition, and specifying changes through time in the rate of deposition requires 75 geometric parameters.

With these input specifications, the code uses sine curves to create surfaces that approximate the shape of bedforms. Di splacement of the sine curves simulates bedform migration, changing amplitude simulates changing bedform height, and combining separate sets of sine curves simulates superpositioning of bedforms. The code is capable of combining the curves according to several different rules: simple addition, adding a percentage of the superimposed curve that is either proportional or inversely proportional to the local elevation of the main curve, or selecting the curve that locally has the greatest elevation (Appendix A). All rules except the latter produce bedforms that generate foresets with tangential basal contacts; the latter rule produces foresets with angular basal contacts.

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Contents

SEPM Concepts in Sedimentology and Paleontology

Cross-Bedding, Bedforms, and Paleocurrents

David M. Rubin
David M. Rubin
U.S. Geological Survey, Santa Cruz, California
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Carissa L. Carter
Carissa L. Carter
U.S. Geological Survey, Santa Cruz, California
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SEPM Society for Sedimentary Geology
Volume
1
ISBN electronic:
9781565761018
Publication date:
January 01, 1987

GeoRef

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