PART II: TESTS 



Stability Scale Effects 



5. If the absolute sizes of experimental breakwater materials and wave 

 dimensions become too small, flow around the armor units enters the laminar 

 regime; and the induced drag forces become a direct function of the Reynolds 

 number. Under these circumstances prototype phenomena are not properly simu- 

 lated, and stability scale effects are induced. Hudson (1975) presents a 

 detailed discussion of the design requirements necessary to ensure the preclu- 

 sion of stability scale effects in small-scale breakwater tests and concludes 

 that scale effects will be negligible if the Reynolds stability number (Rj,)* 



gl/2Hl/2,^ 



where 



2 

 g = acceleration due to gravity, ft/sec 



H = wave height, ft 



I = characteristic length of armor unit, ft 



V = kinematic viscosity 



is equal to or greater than 3 x 10 . For all tests reported herein, the sizes 



of experimental armor and wave dimensions were selected such that scale 



4 

 effects were insignificant (i.e., R^ was greater than 3 x 10 ) . 



Test Procedures 



Method of constructing test sections 



6. All experimental breakwater sections were constructed to reproduce 

 as closely as possible results of the usual methods of constructing full-scale 

 breakwaters. The core material was dampened as it was dumped by bucket or 

 shovel into the flume and was compacted with hand trowels to simulate natural 

 consolidation resulting from wave action during construction of the prototype 



* For convenience, symbols and unusual abbreviations are listed and defined 

 in the Notation (Appendix A) . 



