. Beach and nearshore survey data, 1981-1984, CERC Field Research Facility. Coast changes; Ocean waves. Figure 4. The CRAB 12. Total vehicle weight is about 8,200 kg; the distance between the rear wheels is m. Though it appears top heavy, the liquid-filled tires and wide wheelbase make it very stable. It has passed a 20-deg tilt test and is designed to withstand even steeper angles. 13. Top speed of the CRAB is km/hr on land and somewhat less in the water. Since the maximum significant wave height for operation is 2 m, the CRAB is capable of operating in all but the most severe east co
. Beach and nearshore survey data, 1981-1984, CERC Field Research Facility. Coast changes; Ocean waves. Figure 4. The CRAB 12. Total vehicle weight is about 8,200 kg; the distance between the rear wheels is m. Though it appears top heavy, the liquid-filled tires and wide wheelbase make it very stable. It has passed a 20-deg tilt test and is designed to withstand even steeper angles. 13. Top speed of the CRAB is km/hr on land and somewhat less in the water. Since the maximum significant wave height for operation is 2 m, the CRAB is capable of operating in all but the most severe east coast storms. The large tires have a negligible effect on a hard rippled sand bottom; how- ever, scour around the tires has been observed in areas of active wave break- ing or strong currents if the CRAB remains motionless. The CRAB cannot be used on soft silty or loose bottoms. 14. All beach and dune surveying was accomplished with the standard 10. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Howd, Peter A; Birkemeier, William A. (William Allen), 1951-; U. S. Army Engineer Waterways Experiment Station; United States. Army. Corps of Engineers; Coastal Engineering Research Center (U. S. ). [Vicksburg, Miss. : U. S. Army Engineer Waterways Experiment Station ; Springfield, Va. : available from National Technical Information Service]
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