Machine translation from English source
Owners/managers have information about a number of accidents where navigable river vessels collided with another vessel while overtaking. Such cases would never have happened if due diligence had been done beforehand.
Further examination of the circumstances surrounding these accidents reveals that one of the contributing factors was interaction.
As a result of model testing and practical experience, it is now generally accepted that when two ships pass alongside each other on nearly parallel courses, forces are generated between them causing the ships to attract and repel each other. This effect is called interaction, and it increases in shallow water when two vessels are moving in the same direction and when the difference in speed is small.
Vessels, when overtaking, should not be allowed to pass too close to the vessel being overtaken in open waters where there is sufficient room to navigate. In narrow waters, it can be dangerous to overtake and overtake another vessel.
Interaction on board
When a vessel is subjected to interaction, it appears to those on board to be unresponsive to the rudder. The interaction effect may be as follows
eliminated or reduced by reducing speed.
When navigating on rivers, the captain must keep the above in mind and take into account navigational information and pilot advice.
Avoid, as far as possible, being overtaken by your own vessel or being overtaken by another vessel.
In cases where it is not possible to avoid being overtaken by one's own ship or being overtaken by another ship, an early warning should be given to the master of the ship if he is not on the bridge.
Interaction also occurs between the vessel and the shore of a closed channel, a pier, especially on a river with a strong current, since at the point of maximum water speed the vessel will move towards the shore due to a decrease in pressure at this point. The deeper and shallower the channel, the more interaction and squatting occurs due to the increased "clogging" factor.
In a passing situation, the squatting effect is enhanced when the vessels pass closer to each other.
Note: Shallow water also reduces the effect of the stern drive and therefore, when approaching the berth, the boat's speed should be adjusted so that it can be stopped in time using only the "slow stern". Applicants for seafarer vacancies can send their resume to [email protected].
