Hillblock model tests, 2D model testing report

Report (2011)

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Copyright: © 2011 Hans Hill
Block revetment Hillblock Revetment block
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Published Date

15-03-2011

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000365-rap-u-0001 for Hans Hill Innovations

Abstract

The Hillblock is a concrete element for the protection of dike slopes. Delta Marine Consultants (DMC) investigated the hydraulic properties of the Hillblock in 2D model tests. Wave run-up measurements have been performed on dike slopes with Hillblock revetment and on a smooth impermeable reference slope. The model tests have been carried out at the DMC wave laboratory in Utrecht. Three different dike slopes have been tested: 1:2, 1:3 and 1:4. Two different Hillblock placement patterns have been tested on a 1:4 slope: Standard placement (with relatively large permeability in cross direction) and modified placement (with relatively large permeability in up-slope direction). The wave run-up has been recorded on the reference slope (smooth slope) and on the Hillblock slope by a video camera; the wave run-up heights have been determined from the video records. The run-up heights (with 2% probability of exceedence) on the Hillblock slope are in average 27% smaller than on the reference slope. The reduction may vary from 15% to 35%.