Print Email Facebook Twitter On the mean overtopping rate of rubble mound structures Title On the mean overtopping rate of rubble mound structures Author Etemad-Shahidi, Amir (Griffith University; Edith Cowan University) Koosheh, Ali (Griffith University) van Gent, M.R.A. (TU Delft Coastal Engineering; Deltares) Date 2022 Abstract Estimation of the mean overtopping discharge is a major task in the design and assessment of the crest level of rubble mound structures such as breakwaters and seawalls. The tolerable mean overtopping rates are given based on the associated risk and wave characteristics. Several empirical formulas have been developed for the prediction of mean overtopping discharge at coastal structures. These formulas can be applied to a wide variety of coastal structures, but have limited accuracy and/or do not reflect the physics of the phenomena. The main aim of this study is to overcome these issues for rubble mound structures by considering the physics of the process in the formula development. To achieve this, first, the references used in the extended CLASH database (also called the EurOtop-2018 database), were scrutinized, the reported wave characteristics were corrected (if required) and the rubble mound structure subset was extended using a recent study. Then noting that overtopping occurs when the wave runup exceeds the freeboard, the difference between the maximum wave runup and crest freeboard was considered as the governing parameter in the mean overtopping discharge formula. In the developed formula, a semi-empirical relationship between the mean overtopping and wave runup has been established. The performances of the developed formulas and existing ones were evaluated both qualitatively and quantitively. Accuracy metrics such as RMSE and BIAS indicated the superiority of the developed simple formula. Finally, a design formula to consider uncertainty and some guidelines are provided for practitioners. Subject BreakwaterHydraulic responseMean overtopping dischargeProbabilistic designRubble moundSeawall To reference this document use: http://resolver.tudelft.nl/uuid:13be7707-79d9-4f2a-b77f-533994449296 DOI https://doi.org/10.1016/j.coastaleng.2022.104150 Embargo date 2023-07-01 ISSN 0378-3839 Source Coastal Engineering, 177 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2022 Amir Etemad-Shahidi, Ali Koosheh, M.R.A. van Gent Files PDF 1_s2.0_S0378383922000655_main.pdf 4.7 MB Close viewer /islandora/object/uuid:13be7707-79d9-4f2a-b77f-533994449296/datastream/OBJ/view