Field Measurements of Flow Velocities in Propeller Jets

Conference paper (2023)

Authors

Irene Cantoni Student

A.J. van der Hout Deltares

E.J. Houwing Ministry of Infrastructure and the Environment

A.A. Roubos Port or Rotterdam Authority

Michel Ruijter Ministry of Infrastructure and the Environment

Affiliation

External organisation

Bed protection Quay wall Field measurement Propeller jet Bow thruster

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Published Date

2023

Language

English

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Affiliation

External organisation

Abstract

Propellers of ships generate high velocities adjacent to quay walls, jetties and locks. Generally, a bottom protection is installed in order to prevent instability due to scour. Although design guidance exist, propeller-induced loads are far from fully understood and have predominantly been derived on the basis of model tests. The validation of the existing design methods is lacking, especially for specific types of bow thrusters. In this research, field measurements of flow velocities induced by a 4-channel bow thruster system against a vertical quay wall have been performed. Test results showed a flow characterized by low mean velocities and large fluctuations, with the extent of reflected flow limited to few meters from the quay wall and inflow beneath the suction points playing a role.