Abstract
A dike or levee will protect a polder to build in a tropical country against coastal flooding. To ensure that the performance of the dike is in accordance with the safety standard, wave overtopping tests with a wave overtopping simulator have been performed on a mock-up dike. These wave overtopping tests will guide the selection of the grass species and topsoil for the grass cover of the landward side of the dike. The paper describes the design of a new dedicated wave overtopping simulator, the construction of the mock-up dike, the results of the eight tests on the mock-up dike and the critical velocities (strength indicator of the grass cover) established with the cumulative overload method.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/MCuKojNyNyQ
Highlights
The tests on grass cover with the wave overtopping simulator in the Netherlands have resulted in a method that describes the strength of a grass cover as a function of the wave overtopping
The method is called the cumulative overload method. It considers the front velocity along the crest and landward slope of the dike for each overtopping wave volume with a strength indicator for the grass, the so-called critical velocity
Α2 = influence factor on the critical velocity Uc by transitions or obstacles [-] Small overtopping wave volumes with a front velocity smaller than the critical velocity of the grass cover do not add to the cumulative overload
Summary
It considers the front velocity along the crest and landward slope of the dike for each overtopping wave volume with a strength indicator for the grass, the so-called critical velocity. Α2 = influence factor on the critical velocity Uc by transitions or obstacles [-] Small overtopping wave volumes with a front velocity smaller than the critical velocity of the grass cover do not add to the cumulative overload.
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