Towards a Faster and Cleaner Fairway Maintenance of Dutch Rivers
Type:
Presented during:
WODCON XX: "The Art of Dredging" - 2013, Brussels, Belgium
Authors:
Talmon A, Sieben J, Van der Lugt T
Abstract: The demand for fairway maintenance dredging will increase in The Netherlands because of a National river-widening program (Room for the River program). This applies to the rivers Rijn, Waal and Ijssel. There is however only a limited operation window for dredging in the fairway. Therefor this activity will have to be conducted faster, but it also has to be conducted cleaner (less CO2 emission). Implementation of existing knowledge can optimize Trailing Suction Hopper Dredger activities. Scaled laboratory testing (1:10) of potential innovations, at Deltares, showed that ploughing of river dune tops in shallow area offers the best opportunities for innovations. This study led to the conclusion that the addition of a sliding bottom plate could significantly reduces forces, providing a good chance to increase efficiency. The friction force of such a plate with river bed sand was measured at Deltares on a 1:1 scale. Results exceed expectations, particularly when water is actively injected underneath the plate. In the year 2012 the contractor of Waal dredging designed, constructed and deployed the first prototype of an improved plough for use in a monitoring program. Some features of this monitoring campaign are also reported.
Keywords: river dredging, plough, friction angle, measurements