967 resultados para 290800 Civil Engineering


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Based on the authors' thesis, University of Illinois, Urbana.

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"Final report for the period June 15, 1955 to September 15, 1957 for American Association of Soap and Glycerine Producers."

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Thesis (M.S.)--University of Illinois.

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"UILU-ENG-71-2012."

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"Supported by Federal Water Pollution Control Administration Research Project WP-00047.

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Includes bibliographical references (p. 72-75).

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"Supported by Federal Water Pollution Control Administration Research Grant WP 1011."

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"Supported by Federal Water Pollution Control Administration ... research grant WP 01020."

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Issued October 1977.

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"July 1965."

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"May 1969."

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"July 1976."

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Includes bibliographical references.

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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.