Overtopping 



Major 



Figure 19. Wave overtopping at breakwater head, plan 2 series waves 



Table 4 



Summary of Stability Experiments 



Plan 



Main Features 



Figure 



Photos 



1 



Initial Plan 



Profiles 1 - 4: 6.25-tonne Tetrapods 

 Profiles 4 - 6/7: 8-tonne Core-Locs 

 Profiles 6/7 to head: 1 1 -tonne Core-Locs 

 Crest: +5 m CD south of elbow 

 Packing density (4)): 



8-tonne Core-Locs - 0.55 



1 1 -tonne Core-Locs - 0.59 



10 



A1 through A6 



1A 



Same as Plan 1 except: 



Profiles 4 through 10: 



Toe Protection: buttress of 0.75- to 1 .8-tonne stone 



<$> = 0.60 (8-tonne Core-Locs) 



11 



A7 through A1 2 



1B 



Same as Plan 1 except: 



Toe Protection: chain (Profile 4 to elbow) 



12 



A13 through A1 6 



1C 



Same as Plan 1 B except: 



Toe Protection: anchored chain (Profiles 4 to 1 1) 



4> = 0.62 (8-tonne Core-Locs) 



12 



A1 7 through A22 



2 



Same as Plan 1C except: 



Crest elevation raised from +5 m CD to + 8 m CD 

 1 1 -tonne Core-Locs used on entire structure 

 Toe Protection: Single row of 1 1 -tonne Core-Locs 

 4> = 0.62 



13 



A23 through A27 



2A 



Same as Plan 2 except: 



Toe Protection: Toe trench with 45-deg bevel 



4) = 0.61 



14 



A28 through A33 



2B 



Same as Plan 2A except: 



Toe Protection: Toe trench with vertical face 



<J> = 0.63 



15 



A34 through A36 



2C 



Same as Plan 2A except: 

 Toe protection: Concrete-filled containers spaced 

 1 m apart (Profile 4 to 70 m north of elbow) 



16 



A37 through A42 



2D 



Same as Plan 2C except: 



Toe protection: Containers spaced end to end 



<b = 0.62 



16 



A43 through A46 



Chapter 3 Results 



27 



