0.001 0.01 0.1 1 10 100 



Particle Size (mm) 

 Figure 14. Erosion and deposition of various particle sizes as a function of 

 mean water velocity. (From 'Transportation of Detritus by Moving 

 Water," by F. Hjulstrom, in Recent Marine Sediments. © Society of 

 Economic Paleontologists and Mineralogists, 1955. Used by permission.) 



The measurement of surface phenomena is routine and therefore 

 needs no elaboration here. The U. S. Weather Bureau has standard procedures 

 for measuring those meteorological parameters of interest in site surveys. The 

 Weather Bureau also collects data for numerous locations from permanent 

 weather stations and from weather satellites. Forecasting techniques are also 

 available. Sea surface parameters measured with buoy systems are applicable 

 to detail site surveys for structures. 



MEASUREMENT OF PARAMETERS 



To conduct site surveys for ocean floor structures, specialized 

 equipment, vessels, and submersibles are required. A listing, therefore, 

 has been prepared to facilitate selection of equipment for site surveying 



27 



