--> Abstract: Dynamic Scale Modeling of Bed Configurations, by Lawrence A. Boguchwal, John B. Southard; #90961 (1978).
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Abstract: Dynamic Scale Modeling of Bed Configurations

Previous HitLawrenceTop A. Boguchwal, John B. Southard

A test was conducted proving (a) that dynamic scale modeling of bed configurations using hot water and quartz sand is possible and (b) that the following set of seven independent variables must fully characterize bed configurations: gravitational acceleration, mean-flow velocity, mean-flow depth, fluid density, fluid viscosity, sediment density, and median sediment size.

Existing flume data measured at different temperatures were scaled to their dynamic equivalents at 10°C so that they could be compared dimensionally at one temperature in a depth-velocity-size diagram. Boundaries were fully delineated through the volume of the diagram up to 50-cm flow depth and were extended to a flow depth of 2.5 m.

A pilot study demonstrated the practicality of dynamic scale modeling using hot water with a flume and scale ratio larger than were used for the modeling test. For scale ratios up to about 2.5, natural depths can be simulated in very large flumes, and large flumes can be simulated by small flumes. During the pilot study, the following sequence of bed phases were observed with increasing flow velocity for fine to medium-fine sand sizes: ripples, bars (similar to sand waves), dunes, flattened dunes, upper flat bed, antidunes. For very fine sand sizes (about 0.1 mm), the sequence of bed phases observed with increasing flow velocity was ripples, upper flat bed, antidunes.

AAPG Search and Discovery Article #90961©1978 AAPG Annual Convention and Exhibition, Oklahoma City, Oklahoma