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|Title:||Scale effects in rubble-mound breakwater stability models caused by variations in the specific gravity of the armor units and underlayer stones|
|Authors:||Public Service Electric and Gas Company.|
Hudson, Robert Y.
|Publisher:||Hydraulics Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; H-75-4.|
Abstract: The analytical bases for obtaining dynamic similarity between model and prototype for rubble-mound stability studies were reviewed, and the results of available small-scale tests were analyzed to determine whether variations in the specific gravity of the armor units in the model, compared with the correspending specific gravity of the prototype units, resulted in undesirable scale effects. It was concluded that: (A.) considering the Kydland and Sodefjed data, the stability number, as defined in this report, varies with the specific gravity of the armor units relative to the water in which the structure is situated, (B.) considering the Waterways Experiment Station data and the relatively small variations in the specific gravities of the armor units, model to prototype, that have occurred in the model studies conducted to determine the design of the proposed Public Service Electric and Gas Company of New Jersey breakwaters, the scale effects due to the specific gravity ratio are negligible, (C.) the conclusions of (A.) and (B.) above also apply to the underlayer and core materials when they are exposed to wave action by damage to the armor-unit cover layer, and (D.) until more detailed and general tests have been conducted concerning the effects of the specific gravity ratio on the stability of rubble-mound structures exposed to wave action, model studies which present large differences between model and prototype specific gravities of armor units and exposed underlayer materials should not be performed.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Miscellaneous Paper|
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|MP-H-75-4.pdf||2.82 MB||Adobe PDF|