The International Database on Wave Overtopping

Abstract

One of the main objectives within the EU-project CLASH (www.clash-eu.org) was to create a generic prediction method for wave overtopping at coastal structures by means of the Neural Network technique. An extensive and homogeneous database on wave overtopping was set up within CLASH, mainly with the aim to be used for the training process of the Neural Network (NN). A total number of 10,532 tests from 163 independent test series were screened and included in the database. The final database consists of far more information than needed for the training of the NN: 31 parameters are included to describe each overtopping test of which only 17 are used for the NN development. This explains the possible use of the overtopping database on its own. Plotting various parameters of the database together in graphs gives a clear view on the contents of the database. Also the ranges covered by the parameters can be detected in this way. The creation of the database, the analysis of the database, and the possible use of the database on its own are described in this paper.

Wave reflection from coastal structures in design conditions

“…The wave reflection database (Zanuttigh and Van der Meer, 2006) includes part of the DELOS wave transmission database ( , part of the CLASH wave overtopping database (general presentation in Steendam et al, 2004;armour unit data in Bruce et al, 2006), data acquired from model testing in European facilities (among the others, Lissev,1993), field measurements (at Elmer, UK, see Davidson et al,1996), recent tests on low-crested structures (Cappietti et al, 2006) for a total of more than 4000 data. A synthesis of data type and quantity is given in Table 1.…”

Atoll lagoon flushing forced by waves

“…These two forms were originally developed by Weggel (1976), Owen (1980), and van der Meer and Janssen (1995). Recently, Steendam et al (2004) plotted relative crest height, R c H s against dimensionless flow rate, q i ffiffiffiffiffiffiffiffi ffi gH 3 s p for more than ten thousand test results, their Fig. 3, which shows significant scatter when geometry and other parameters are ignored (five orders of magnitude in dimensionless flow rate for relative height (R c / H s ) in the range 0.3 up to 3.5).…”

Analysis of Wave Reflection From Structures With Berms Through an Extensive Database and 2dv Numerical Modelling

“…The reflection behaviour for various types of straight slopes, such as smooth structures, rock slopes (permeable and impermeable core), slopes with all kind of artificial armour units, has been analysed in depth by Zanuttigh and Van der Meer (2006) by means of an extensive reflection database, which includes part of the DELOS wave transmission database (Van der Meer et al, 2005) and of the CLASH wave overtopping database (Steendam et al, 2004;Bruce et al, 2006). They developed a new formula for all types of straight slopes in design conditions and performed a preliminary analysis on the extension to non-straight slopes (Zanuttigh and Van der Meer, 2007).…”