V. ' ] Leu] b ural a nd Mech anic al College of Tcxae; , Co ntract ;,c. 



' ! ' ' ' '" ! ! • '' ' ' eport for period ending 31 Oct 1953 . 



^ • Field. Operations. Field operations were continued from July 21, 

 1953 through this o.uarter at the Pure Oil Structures A and 13. The third 

 recorder was installed recently at the end of Sun Oil Pier. Wave records 

 were obtained for 20 minute intervals once every 6 hours at all sites curing 

 operation. 



Field Operations have temporarily been curtailed at the Fare Oil Structures, 

 and are being resumed at the Sun Gil Pier. It is felt that for the time 

 being, efforts should be made to get some comprehensive wave data at the Sun 

 Oil Pier before resuming operations at the Pure Oil Structure, in audition 

 funds are running low for transportation and boat rental (the cost of which 

 is greater) for operations at the Pure Oil sites. 



Analysis had begun of the wave records obtained at the Pure Oil 

 Structures A and B during this quarter. 



2, T heoretical Investigations . Work has continued on the theoretical 

 investigation of the effect of bottom fluctuations on the change in wave 

 height. 



Computations involving the combinations of wave generation andw ave 

 energy loss due to bottom friction has been continued. Relationships for 

 the steady state conditions of wave generation over a flat bottom have 

 been developed. That is, dimensionless relationships of gH/U^ and gT'/U 

 versus gd/lK have been developed for unlimited fetch length and unlimited 

 wind duration and for bottom friction factors cf .01 and .06. The Lake 

 Okeechobee wave data as well as the' wind wave data obtained in the 

 Atchafalaya Bay during the fall of 1952, seem to fit the above relationships 

 best for a bottom friction factor of .01 or .02. 



3. Technical Papers and Ke ports . Work has progressed slowly on the 

 technical report "Change in Wave Height Due to Bottom Friction, Percolation 

 and Refraction 11 . The reason for the slow down is that most of the time had 

 been spent completing another technical report "Surface Waves and Offshore 

 Structures; the Design Wave in Deep or Shallow rfater, Storm Tide, and r orces 

 on Vertical Piling and Large Submerged Objects'', by R. 0. Reid and C. I. 



B r e t s chne i de r . 



A third technical report, ir Wave Energy Loss of Wind Generated waves Over 

 a Shallow Bottom" has been initiated. This report summarizes the analytical 

 relationships developed for shallow water wind wave generations, as well as 

 the results of the analysis of the wind wave records obtained in the shallow 

 water of the Atchafalaya Bay. 



A fourth technical report has been initiated on the effect of bottom 

 fluctuations on wave heights. 



2h 



