Settlement of Cylindrical Mines into the Sea Bed Gravity Waves
Abstract
Three simplications were employed in the model tests: (1) the undisturbed velocity approaching the mine was made to correspond to the bottom velocity under a first-order Stokian gravity wave; (2) the lenghth-to-diameter ratio of the cylinder was four; and (3) the bed materials were limited to being well-rounded and uniformly sized having mean diameters of 0.297 mm and 0.585 mm. The test was conducted in the bottom horizontal section 1 ft (vertical) by 4 ft (horizontal)of a large U tube; the test section in which water oscillated over a 4-in thick bed of sand. Settlement was observed under waves with total amplitude of water motion at the bed of 2.8 ft and 1.0 ft and with a period of 3.6 seconds. Settlement and turning occured spasmodically when the support under the cylinder collasped as the surrounding scour hole deepened and laterally expanded. Sediment transport out of the scour hole was observed to be bed-load movement with the lower amplitude waves and to be suspendedload movement with the higher amplitude waves. Rate of sediment removal functions were formulated and incorporated into the equation of continuity which was then integrated. Data on mine settlement, bottom velocity, and bed material were obtained. The agreement between the predicted settlement and the observed settlement was good.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1963
- Accession Number
- AD0350001
Entities
People
- C. S. Martin
- M. R. Carstens
Organizations
- Georgia Tech