selection and placement of individual armor stones to achieve a higher degree
of interlocking. Such attempts to increase interlocking should be encouraged
both in the specification and by the Corps inspectors because of the increase
in structure stability. Specific values of the stability coefficient KD have
not been developed for the selected placement method because of the variation
which may occur from project to project. Structures built above water, e.g.,
riprap bank protection, can generally be constructed with more careful
placement than structures built below water. In general, additional
laboratory testing will be required to determine possible increases in the
values of KD above the values shown for random placement.
ADDITIONAL INFORMATION:
Contact Mr. D. D. Davidson, Chief, Wave Research
Branch, (601) 634-2722 or Dr. F. E. Camfield, Chief, Coastal
Design Branch, (601) 634-2012
REFERENCES:
Kidby, H. A., Powell, S. B., and Roberts, A. L. 1964 (Nov). "Placed-Stone
Jetty, Stone Weight Coefficients," Journal of the Waterways and Harbors
Division, ASCE, Vol 90, No. WW4, pp 77-86.
Debok, D. H., and Sollitt, C. K.
1 9 7 4 . "A Large-Scale Model Study of Placed
Stone Breakwaters," Ocean Engineering Department, Oregon State University,
Unpublished.
Jackson, R. A. 1968. "Design of Cover Layers for Rubble-Mound Breakwaters
Subjected to Nonbreaking Waves"' CERC Research Report No. 2-11, US Army
Engineer, Waterways Experiment Station, Vicksburg, Miss.
Markle, D. G., and Davidson, D. D. 1979. "Stability Coefficient for Placed
Stone Jetties," Engineering Technical Letter (ETL) 1110-2-242, Headquarters,
US Army Corps of Engineers, Washington, DC.
Shore Protection Manual. 1984. 4th ed., 2 vols, US Army Engineer Waterways
Experiment Station, Coastal Engineering Research Center, US Government
Printing Office, Washington, DC.
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