It is estimated that this project report is approximately 60 per cent complete. 
Study of Wind Set-up and Wave Generation in Inland Waters - Arrangements 
are being made for additional laboratory study, probably by contract. 
Preparation of Reports Based on Mission Bay Field Data - A report on the 
probable magnitude of the errors involved in hydrographic surveying was pre-= 
sented at the Coastal Engineering Conference at MIT in October. Additional 
data on the error to be expected with lead line sounding is being analyzed, 
and will be incorporated in the final report. 
Statistical Wave Data on the Great Lakes = A report is being prepared on 
the data compiled for Lake Michigan and should be published early in 1953. 
The report will include an example showing how shallow water data at any 
point may be cbtained from the hindcast data at the five stations. Analysis 
of weather charts for the same three years (198-1950) has been initiated for 
the stations on Lake Ontario (Hamilton, Ontarios Rochester, N. Y.; Stony 
Point, Ne Ye) 
Statistical Data on the North Atlantic Coast ~ The three years of data 
obtained from the weather charts for each station is being compiled into a 
form suitable for engineering usage. 
= 
Wave Tank Study of Wave Energy Loss by Bottom Friction and Percolation = 
A report on the test results has been completed and is undér review by the 
staff. 
Study of Parailel Lines Method for Detecting and Measuring Wave Trains ~ 
Further work is in progress to determine the applicability of the method for 
practical use. The study of aerial photos is being continued, using the 
parallei line method to separate out the wave trains as a means of assessing 
the value of the method. 
Use of Raleigh Disc_as Wave Direction and Force Indicator - Study has been 
made of various damping systems and pressure celis for use with the Raleigh 
disc, and the component parts for a sensitive type pressure gage have been 
ordered. It isi believed this gage, when assembled, will record the very 
small pressures caused by the water motion. While awaiting delivery on these 
parts, a Rayleigh disc and damping system is being assembled, and will be 
tested initially without the pressure cell. 
Effect of Cylindrical Obstacles on Waves Passing Around Them = The tests 
have indicated that the energy distribution behind cylindrical obstacles 
can be predicted very closely by diffraction theory, at least for cases where 
the distance between obstacles is many times the obstacle diameter. The tests 
have shown the disirability of having the pipe supports in the ccast model 
basin not exceed 1 inch in diameter, and this size has been chosen for use there. 
Study of Methods of Sand Analysis by Sett, ing Tubes - Correspondence to 
other agencies concerning methods of sand size analysis applicable to beach 
45 
