Test conditions and results 



Three sets of four tests each were conducted with each set consisting of 

 one wave height at each of two wave periods at each of two swl's. Test 

 conditions were the highest obtainable wave height at each of the wave 

 periods and swl's listed in Table 17, with the exception of swi = +17.6 ft 

 mlw, which exceeds the design storm conditions and was not tested in this 

 series. Tests 46 through 49 were conducted with the beach elevation at 

 +9.3 ft mlw (1978 survey). Tests 50 through 53 repeated the wave condi- 

 tions but with the beach elevation raised to +14.3 ft mlw, and Tests 54 

 through 57 raised the beach elevation to +16.7 ft mlw. Test conditions, 

 measured overtopping rates, and number of armor stones displaced are 

 listed in Table 18. 



Although the rubble-mound dike never approached a failure condition, 

 with failure defined as having the underlayer exposed, armor stones were 

 displaced during several of the tests. Displaced armor stones were re- 

 placed on the structure only after each set of four tests. 



Tests 46 through 49 (beach elevation as measured in the 1978 survey) 

 all produced overtopping. Some armor stones were displaced, with 



Table 18 



Test Conditions, Overtopping Rates, and Armor Stone Displacement 



for Rubble-mound Dike with 1978 Profile 



Run 

 No. 



SWL 

 ft mlw 



Wave 



Height 



ft 



Wave 



Period 



sec 



Seawall 

 Crest 

 Elev. 

 ft mlw 



Dike 

 Crest 

 Elev. 

 ft mlw 



Beach 



Elev. 



Hmlw 



Over- 

 topping 

 cfs/ft 



Armor Stone Displacement 



Seaward 



Shoreward 



46 



16.6 



11.0 



15.9 



21.3 



25.4 



9.3 



0.0618 



15 



18 



47 



16.6 



11.4 



13.0 



21.3 



25.4 



9.3 



0.0446 



9 







48 



14.8 



9.6 



15.9 



21.3 



25.4 



9.3 



0.0026 











49 



14.8 



9.9 



13.0 



21.3 



25.4 



9.3 



0.0024 



3 







50 



14.8 



9.9 



13.0 



21.3 



25.4 



14.3 



0.0000 











51 



14.8 



9.6 



15.9 



21.3 



25.4 



14.3 



0.0000 











52 



16.6 



11.4 



13.0 



21.3 



25.4 



14.3 



0.0166 



6 



8 



53 



16.6 



11.0 



15.9 



21.3 



25.4 



14.3 



0.0067 



2 







54 



16.6 



11.0 



15.9 



21.3 



25.4 



16.7 



0.0054 



2 







55 



16.6 



11.4 



13.0 



21.3 



25.4 



16.7 



0.0045 











56 



14.8 



9.6 



15.9 



21.3 



25.4 



16.7 



0.0000 











57 



14.8 



9.9 



13.0 



21.3 



25.4 



16.7 



0.0000 











Chapter 5 Revere Dike Study 



55 



