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Home / Hopper Sedimentation /

    06-The effect of the bed rise velocity on the sedimentation process in hopper dredges. (548)

In the last decennia there has been a strong development in the enlargement of TSHD’s (Trailing Suction Hopper Dredges) from roughly 10.000 m3 in the early 90’s up to 50.000 m3 expected loading capacity in 2010. Because of the economy of the loading process, but also environmental regulations, it is important to predict the overflow losses that are occurring. Van Rhee (2002) developed a sophisticated model, but this model is not easy to reproduce. The strong point of the Miedema & Vlasblom (1996) model is the simplicity, giving a transparent model where cause and result are easily related. The Miedema & Vlasblom model can be extended with a number of features that do not really influence the simplicity of the model. One can think of:
• Implementing the layer thickness of the layer of water above overflow level.
• Implementing a horizontal velocity distribution in the hopper that will result in a more gradual influence of the scour effect during the loading process.
• Implementing a storage effect.
• Implementing a starting volume of water when the loading process starts.
• Implementing a varying inflow and density of mixture.
As a first attempt an analytical model has been developed to predict the overflow losses with a single equation. This model has been verified with test data of van Rhee (2002) and Ooijens (2001). Other papers will follow describing the other effects as mentioned above.

Reference:

Miedema, S.A., "The effect of the bed rise velocity on the sedimentation process in hopper dredges". Journal of Dredging Engineering, Vol. 10, No. 1 , 10-31, 2009.



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