averages for each of 4 years of temperature measurements made in the LWT from 

 1969 to 1973. The wave generator was run to mix the water prior to measure- 

 ment. A clear seasonal cycle was apparent, and the four averages for each 

 month showed relatively small differences. Therefore, a grand average for 

 each month is expected to provide a reasonable estimate of water temperature 

 in the LWT during the movable-bed tests. Fall velocities for the 0.22-mm and 

 0.40-mm sands were measured by Seelig using the CERC Rapid Sediment Analyzer 

 and water at 20° C. Fall velocities were then estimated at the other temper- 

 atures. This material was reviewed in the course of preparing this report and 

 compiled in Table A17 for direct reference to the various cases. 



Table A17 



Representative Average Monthly Water Temperatures 

 and Sand Fall Velocities 











Case 



Approx. Date 



Temperature 



Fall Velocity 



No. 



month-year 

 3-56 



deg C 



cm/sec 



100 



6 



3.1 



110 



7-56 



26 



3.8 



200 



5-56 



18 



3.6 



300 



11-56 



12 



• 3.3 



400 



12-56 



7 



3.1 



500 



3-57 



6 



3.1 



510 



5-57 



18 



3.6 



600 



6-56 



22 



3.7 



610 



6-56 



22 



3.7 



700 



6-56 



22 



3.7 



101 



7-62 



26 



5.9 



201 



7-62 



26 



5.9 



301 



6-62 



22 



5.7 



401 



5-62 



18 



5.5 



501 



7-62 



26 



5.9 



701 



7-62 



26 



5.9 



801 



7-62 



26 



5.9 



901 



8-62 



26 



5.9 



911 



8-62 



26 



5.9 



5. Water temperature in the LWT was recorded in the logbooks for 

 Case 300. Elapsed time of wave action and water temperature are given in 

 Table A18. Table A18 shows measured temperatures of about 5° C, whereas the 

 estimate for this case in Table A 1 7 gives 12° C. This difference has a small 

 effect on fall velocity for the 0.22-mm sand. 



A16 



