NO. 30 - February 1953 



II-A "Annotated Bibliography on Tsunamis" by Marcial P. Cuellar 

 F 



A bibliography of 195 items prepared and annotated as 

 a project of the Committee for the Study of Tsunamis, 

 American Geophysical Union. 



NO. 31 - February 1953 



I-A "Laboratory Study of Wave Energy Losses by Bottom Friction 

 and Percolation" by Rudolph P. Savage 



The theory for dissipation of wave energy by bottom 

 friction (Putnam and Johnson) and by percolation in a 

 permeable sea bottom (Putnam) were checked by laboratory 

 experiment. The experimental data were obtained in a 

 wave flume divided by a splitter wall, one side of which 

 had a smooth bottom with essentially no bottom friction 

 or percolation and the other side a rough (rippled) or 

 a permeable sand bottom. Energy losses were measured as 

 reduction in wave height. £:q>erimental losses due to 

 friction agreed reasonably well with those given by theory 

 for conditicHis of natural ripples, but were substantially 

 greater for artificial ripples dissimilar to natural 

 ripples. Experimental losses due to percolation were far 

 less than theoretical values, the difference apparently 

 varying with water depth. 



NO. 32 - March 1953 



II-D "Accuracy of Hydrographic Surveying in and Near the Surf Zone" 

 by Thomdike Saville, Jr., and Joseph M. Caldwell 



The results of a study to determine on a statistical basis 

 the degree of accuracy that can be expected in hydrographic 

 survey work where comparability of successive surveys is a 

 prime consideration are presented. Test surveys to deter- 

 mine the magnitude of sounding error (accuracy with which 

 the deduced profile actually represents the bottom hydro- 

 graphy along the particular range being sounded) and 

 spacing error (accuracy with which the particular profile 

 portrays the characteristics of its assigned section of 

 beach or bottom) were made at Missicm Beach, California. 

 Application of the results of these tests indicates that 

 serious misinterpretations of volumetric information de- 

 rived from comparative surveys can result in the probable 

 survey error is not considered. 



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