Table 7-3. Some considerations of breakwater selection. 



Increasing Permeability 



-> 



00 



•H 

 01 



(U 



u 



u 

 u 



3 



u 



Submerged 



Subaerial 



Impermeable 



High wave transmission (K >0.4) 



Low reflection 



Low amount of material 



Does not obstruct view 



May be a navigation hazard 



V 



Low transmission except where 

 runup is extreme 



Good working platform 



High reflection 



Occupies little space 



Failure may be dramatic 

 Inhibits circulation 



Permeable 



Same 



Same 



Same 



Same 



Same 



Provides habitat for 

 marine life 



Excellent dissipator of 

 wave energy 



Low transmission 



Low reflection 



Deserves serious considera- 

 tion if adequate armor 

 material is available 



Structure can be functional 

 even with some failure 



Provides habitat for marine 

 life 



Allows circulation due to 

 low-steepness waves 



7-64 



