Bow Thruster Currents at Open Quay Constructions on Piles

The hydraulic loads on the slope at open quay constructions on piles is investigated. The propeller (bow thruster) jet induces hydraulic loads on the slope, which could result in scour holes and damage to the quay construction. Performed scale model tests provide details about the hydraulic loads in this specific situation with an inclining slope and piles. Measurements are compared to calculations with the equation for an unconfined propeller jet, to include in the design of open quay constructions on piles.

In many ports berths consist of a slope covered with a deck on piles. Usually the slope is protected with some armourstone. Because of an increase in the use of powerful bow thrusters, the load on the slope protection increases, which may require heavier armour. However, replacing the armour below a deck is complicated and consequently very costly.