Jet scour

Journal article (2011)
Department
Hydraulic Engineering (CEG) (TU Delft)
Copyright: Verheij, H.J.
DOI: https://doi.org/doi:10.1680/maen.2011.164.4.185
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Published Date

01-12-2011

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Source:

Proceedings of the ICE - Maritime Engineering, Volume 164, Issue 4, 01 December 2011 , pages 185 –193

Faculty

Civil Engineering and Geosciences

Department

Hydraulic Engineering

Abstract

This paper discusses scour without bed protection, such as propeller scour, two-dimensional horizontal, three-dimensional horizontal scour generated by free jets downstream of gates and outlets, two-dimensional vertical and three-dimensional vertical scour. The flow velocities in two- and three-dimensional propeller and free jets are briefly summarised where special attention is paid to the Dutch and German approaches for calculating the near-bed load caused by propellers. The time scale of propeller scour is approximated by applying the Breusers' time-dependent scour equation. For the maximum scour depth in the equilibrium phase Newton's second law is used.