Sand ripple growth in an oscillatory-flow water tunnel /
by Karl E.B. Lofquist ; prepared for U.S. Army, Corps of Engineers, Coastal Engineering Research Center.

Description

Main Author

Lofquist, Karl E. B.

Related Names

Coastal Engineering Research Center (U.S.)

Language(s)

English

Published

Fort Belvoir, Virginia : U.S. Army Coastal Engineering Research Center ; 1978.

Subjects

Civil Engineering.
Physical and Dynamic Oceanography.
Ripple-marks.
Coast changes.
Water tunnels.
Beaches.
Oscillation.
Transport properties.
Grain size.
Coastal regions.
Laboratory tests.
Beach erosion.
Ripples.
Sand.
Ocean waves.
Coast changes > Coast changes / United States.
Ripple-marks.
United States.

Summary

The development of sand ripples in an oscillatory-flow water tunnel was observed in 104 laboratory experiments approximating conditions at the seabed under steady progressive surface waves. The period, T, and amplitude, a, of the water motion were varied over wide ranges. Three quartz sands were used, with mean grain diameters, D = 0.55, 0.21, and 0.18 millimeter. In 24 experiments, with the bed initially leveled, T was reduced until ripples appeared, and their development to final equilibrium form was observed without further change in T. The remaining 80 experiments investigated the response of previously established bed forms to changes in T or a or both. The ripple length, lambda, and height, eta, were measured from photos, except when bed forms were three dimensional.

Note

"August 1978."
Cover title.

Physical Description

101 pages : illustrations ; 27 cm.

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