THE PERFORMANCE OF MODEL SHIPS IN RESTRICTED CHANNELS IN RELATION TO THE DESIGN OF A SHIP CANAL
DAVID TAYLOR MODEL BASIN WASHINGTON DC
Pagination or Media Count:
In this investigation a series of tests were made with selected ship models operating in restricted channels. The tests were made to determine the effect of channel dimensions on the relative controllability and the sinkage of ships in straight channels and to determine the effect of channel-bend design on the controllability of ships. The hydrodynamic phenomena of major importance in the study are bank suction, interaction between ships, and the change of level of the water surface in the vicinity of a moving vessel. The major test variables include the width and depth of the channel, bend design, ship speed, position of the ships in the channel, type of ships represented, and the velocity and direction of channel currents. Most of the tests were conducted in model channels representing full-scale channels ranging from 268 to 770 feet in width and from 45 to 80 feet in depth. The major emphasis was on ship speed between 5 and 10 knots with respect to the water, but the change-of-level tests were made at speeds up to 20 knots in some channels. The channel currents ranged between 5 knots following current and 5 knots ahead current. The ships represented in the tests were selected because of their extreme size, their poor handling characteristics in restricted channels, or because they were representative of a large number of ships.
- Marine Engineering