Bank Effects

Question 1

Contributing factors for Bank Effects.

Answer 1

• Depth/draft ratio.
• Depth of water over a bank of greatest influence.
• Distance between ship and bank of greatest influence.
• Vessel’s speed.
• In a canal, the blockage factor.

Question 2

Navigating within a confined waterway.

Answer 2

• Stay near the centerline.
• Use rudder to maintain equilibrium if force close to the bank.
• Use small amounts of rudder.
• Passing other vessels will magnify the situation.
• The closer to the bank the greater the effect.
• Ships with larger beams are more prone to the effect and squat.
• If situation gets out of control, slow down.

Question 3

Possible pressure regions

Answer 3

Question 4

Ship to ship interaction

Answer 4

• Meeting end on
• Overtaking
• Passing

Question 5

Small vessel being overtaken

Answer 5

• Stay on the centerline for as long as possible.
• Keep low speed.
• The smaller vessel will be most effective.
• Return to the centre of the channel ASAP.

Question 6

Bernoulli theorem

Answer 6

Bernoulli’s principle states that when there is an increase in the speed of a fluid, it simultaneously decreases the static pressure it exerts. Therefore, if there is a faster-moving water between two ships, the water pressure against the side of the ships facing the faster-moving water will decrease.