207. WADA, A., "On a Method Of Solution Of Diffraction Problems," Coastal 

 Eng-ineexn.ng in Japans Tokyo, Japan, Vol. 8, 1965, pp. 1-19. 



Keywords: Detached breakwater. Wave diffraction 



The technique presented here provides a significant extension of 

 the range of diffraction problems that can be solved by the use of a 

 Fourier transform; e.g., the problem of diffraction of sea waves by an 

 insular breakwater is treated. Approximate expressions, taking into 

 account the interaction between the edges, are derived. Some numerical 

 results are also presented in which the interaction solution significantly 

 improves the noninteraction approximation. 



208. WADA, Y., NISHIMURA, H., and NIREI, Y. , "Scour Around Breakwaters 

 and Erosion of Adjacent Beaches," Pvooeedings of the 17th. Conference 

 on Coastal Engineering In Japan, Japan Society of Civil Engineers, 

 1970, pp. 311-316 (in Japanese). 



209. WALKER, J.R., PALMER, R.Q., and DUNHAM, J.W., "Breakwater Back 

 Slope Stability," Proceedings of Civil Engineering in the Oceans 

 III, American Society of Civil Engineers, 1975, pp. 878-898. 



Keywords: Armor stability. Armor units, Design guidelines. Hydraulic 

 model (two-dimensional). Local scour. Rubble mound. Wave 

 overtopping 



This paper summarizes factors governing the stability of low-crest 

 breakwaters subjected to overtopping waves. Both model experiments and 

 prototype experience indicate that the backslope armor units of such 

 breakwaters may be more susceptible to damage than those on the seaward 

 slope. It is often desirable to lower the crest elevation to reduce the 

 first cost where partial protection from the incident waves is required. 

 Such applications occur in water intakes for powerplants, small -craft 

 harbor entrance channels, beach protection projects, and hard-surfaced 

 offshore fills. 



210. WALTON, T.L., Jr., "Equilibrium Shores and Coastal Design," Coastal 

 Sediments '7? , Fourth Annual Syrmposiun of the Waterways, Port, 

 Coastal and Ocean Division, American Society of Civil Engineers, 

 1977, pp. 1-16. 



Keywords: Crenulate-shaped bay 



Logarithmic spiral curves approximate equilibrium shoreline shapes 

 for areas of Florida's coast which are sheltered by natural reefs and 

 capes. However, the log spiral curve lacks physical justification for 

 describing the phenomena of an equilibrium coast. A model is postulated 

 for an equilibrium coast which uses a continuous wave height energy dis- 

 tribution from visual ship wave observations to predict the stable, 

 sheltered shoreline and is found to provide shoreline shapes similar to 

 the logarithmic spiral shape for sheltered coasts in Florida, The method 



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