Frederik Bisschop, Paul Visser, Cees van Rhee, Henk Jan Verhagen


Convential models for the erosion of non-cohesive sediments overestimate the erosion rate induced by high flow velocities. These high flow velocities occur, for instance, in breaching of embankments or dunes (flow velocities up to 10 m/s) or in jetting sand with a trailing suction hopper dredger (30 to 60 m/s). At these very large flow velocities the erosion process is significantly influenced by the properties of the soil mass (non-cohesive particles). Governing parameters at higher flow velocities are dilatancy, permeability and the (un)drained shear strength of the soil. The sediment concentration in the water also influences the erosion process, especially in case of higher erosion rates. Based on the concept of Van Rhee (2007, 2010) a simple analytical formula is derived that gives a clear insight into the parameters influencing hindered erosion. The concept of hindered erosion is explained by two properties of granular soils: dilatancy and permeability. This implicates that the erosion behaviour of granular soils cannot be described by the behaviour of single particles alone. The properties of the whole soil mass should be considered in predicting erosion at higher flow velocities. Results of a large-scale breach experiment performed in 1994 in the Zwin Channel in the Netherlands (Visser, 1998) are analyzed to evaluate the formula.


(hindered) erosion; granular sediments; breaching; jetting

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Batu, V. 1998. Aquifer Hydraulics; A Comprehensive Guide to Hydrogeologic Data Analysis, John Wiley & Sons, New York, NY, USA. PMid:9689423

Bear, J. 1972. Dynamics of Fluids in Porous Media, American Elsevier, New York, NY, USA.

Carrier, W.D. 2003. Goodbye, Hazen; Hello, Kozeny-Carman, Journal of Geotechnical and Environmental Engineering, ASCE, vol. 129, no. 11, pp. 1054-1056.

CROW, 2004. Handboek Zandboek (in Dutch), CROW, Ede, the Netherlands.

Lambe, T.W. and R.W. Whitman. 1969. Soil Mechanics, John Wiley & Sons, New York, NY, USA.


Van Rhee, C. 2007. Erosion of granular sediments at high flow velocity, Hydrotransport 17, The 17th International Conference on the Hydraulic Transport of Solids, Cape Town, South Africa.

Van Rhee, C. 2010. Sediment entrainment at high flow velocity, Journal of Hydraulic Engineering, ASCE, vol. 136, no. 9, pp. 572-582.

Van Rhee, C. and A. Bezuijen. 1992. Influence of seepage on stability of sandy slope, Journal of Geotechnical Engineering, ASCE, vol. 118, no. 8, pp. 1236-1240.

Van Rijn, L.C. 1993. Principles of Sediment Transport in Rivers, Estuaries and Coastal Seas, Amsterdam, the Netherlands. PMCid:1005200

Visser, P.J. 1998. Breach growth in sand-dikes, PhD thesis, Delft University of Technology, Delft, the Netherlands.