Wave-induced migration of grounded ships.

摘要

An improved understanding of the behavior of ships after running aground could lessen the environmental and economic damage caused by ship groundings. Wave forces often push grounded ships towards the beach, sometimes so far ashore that they become unreachable by salvage vessels. An estimate of the distance a grounded ship may migrate in a given time would help ship owners, insurers, and government officials make critical decisions in the initial hours after a ship grounding. The present study analyzes linear and nonlinear grounded ship motions, both experimentally and theoretically. Experiments were conducted to measure the motion response of an embedded ship hull at model-scale to both small-amplitude and solitary waves. The predicted oscillatory motion responses, based upon prior theoretical work on the linear motion of grounded ships, are compared to results from the small-amplitude wave experiments. A new method is presented to predict the distance a grounded ship will migrate ashore in a given time. This method shows good correlation with the migration distances observed in the solitary wave experiments.