Abstract
This article describes the investigation of average wave overtopping performance for sloping coastal structures characterised by very steep slopes (typically cot α < 0.5) and very small freeboards. Based on experimental tests, performed in the large wave flume of Ghent University, the influence of the relevant hydraulic and geometrical parameters on overtopping is examined. Test set-up and test parameters are presented and discussed in detail in this paper. Furthermore, the established dataset, called UG13 dataset, is compared to prediction formulae from existing literature, including the limiting cases of zero freeboard and vertical wall.
Highlights
Overtopping is a governing process in the protection against flooding
This article extends earlier research of Victor & Troch (2012a, 2012b), who investigated the cases of steep slopes and small freeboards for smooth sloping coastal structures
The main goal of the research presented in this paper is to extend the existing overtopping datasets to steep slopes and vertical walls for the case of relatively deep water wave conditions by performing additional overtopping experiments in the wave flume of Ghent University using a set-up as presented in detail in Victor & Troch (2010)
Summary
Overtopping is a governing process in the protection against flooding. Coastal defence structures should be built from an economic and aesthetic point of view. The main goal of the research presented in this paper is to extend the existing overtopping datasets to steep slopes and vertical walls for the case of relatively deep water wave conditions by performing additional overtopping experiments in the wave flume of Ghent University using a set-up as presented in detail in Victor & Troch (2010). The test set-up, as used by Victor & Troch (2010) in the wave flume of Ghent University, is re-used to determine the average overtopping rates for two cases, a general case and a case for zero freeboard and vertical walls. First of all the general case of steep slopes with 0 ≤ cot α ≤ 2.14 and 0 ≤ Rc/Hm0 ≤ 2 is considered, where α is the slope angle, Rc is the crest freeboard and Hm0 is the incident wave height. The formulae of Victor & Troch (2012b) predict the average overtopping rate good (not shown in Fig. 4 for clarity as formula varies with slope angle) the formulae slightly underestimate the average overtopping rate for the steeper slopes
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