Hydrodynamic erosion process of undisturbed clay

Hydrodynamic erosion process of undisturbed clay

Zhao, G.
Visser, P.J.
Vrijling, J.K.

Civil Engineering and Geosciences

Hydraulic Engineering

2011-12-31

This paper describes the hydrodynamic erosion process of undisturbed clay due to the turbulent flow, based on theoretical analysis and experimental results. The undisturbed clay has the unique and complicated characteristics of cohesive force among clay particles, which are highly different from disturbed clay and non-cohesive sand. Based on momentum equilibrium, the critical incipient velocity is derived from the forces of particle weight under water, cohesive force among particles around the clay particle, uplift force and drag force. Via the turbulent boundary layer flow theory, the critical stress can be connected with these forces. The formulae for the incipient stress and the critical velocity have been calibrated and validated with the results of undisturbed clay tests. A new formula for the erosion rate is proposed. The study gives a new insight into the erosion process of undisturbed clay and the resulting sediment transport

erosion process
undisturbed clay
turbulent boundary-layer flow
incipient stress

http://resolver.tudelft.nl/uuid:acce69fb-86c6-403f-a972-0735df7218e9

978-0-85825-868-6

Proceeding of the 34th IAHR World Congress, 2011, June/July, Brisbane

Institutional Repository

conference paper

(c) 2011 Zhao, G., Visser, P.J., Vrijling, J.K.