T.M. No. 65 (Continued) 



winter season. Tiie sediments on iUe beach are highly variable and 

 the average variation within a distance of 16 feet of selected points 

 is 60 to 55 percent of the total variation encountered. Samples 

 taken in October are definitely more fine-grained than in June or 

 January. The sediments show a distinct relationship to position on 

 the beach; coarse on the lower foreshore, fine on the upper foreshore, 

 and slightly coarser on the berm than on the upper foreshore. The 

 grain size shows no variation with slope of the beach, which is 

 steep, sloping in general 5 to 1 2 degrees. 



T.M. No. 66 - December 1955 



Factors Affecting the Economic Life of Timber in Coastal Structures 

 by R. A. Jachowski 



Information concerning durability of timber in coastal structures 

 including such factors as marine borers, geographic factors affecting 

 deterioration, and methods of protection and treatment, is presented. 

 Appendixes show intensity of marine borer attack by geographic loca- 

 tion and data from service records of timber coastal structures. 



T. M. No. 67 - December 1955 



A Model Study of the Run-up of Wind-Generated Waves on Levees with 

 Slopes of 1:3 -and I :6 by Osva I d J. Sibul and Ernest G. Tickner 



Wave runup under wind action was investigated in a laboratory 

 wind tunnel to determine relative importance of the wind force in 

 increasing runup over that observed for mechanically generated waves 

 or that might be observed in nature under calm conditions. For lower 

 wind velocities relative runup values were indicated to be the same 

 as for mechanically generated uniform waves. For higher wind veloc- 

 ities the runup increases with increasing wind velocity and may reach 

 double the value of runup where no wind is involved. Runup on the 

 1:3 slope was found to be considerably higher than that on the 1:6 

 slope, confirming the trend found by others using uniform waves. 



T.M. No. 68 - February 1956 



Wave Action and Sand Movement near Anaheim Bay, California 

 by Joseph M. Ca I dwel I 



The purpose of the study was to determine the degree to which 

 mass alongshore sand movement on the beach and offshore bottom can 

 be correlated with characteristics of ocean waves impinging on the 

 beach. Field data were collected in connection with a beach fill 

 operation for shore protection immediately south of the Anaheim Bay 

 jetties. Analyses are made of wave energy, sand characteristics and 

 volumetric changes. An approximate relationship for net alongshore 

 sand movement in cubic yards per day in terms of intensity of net 



20 



