Modelling of wave overtopping flow over complex dike geometries: case study of the Afsluitdijk

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

13 Downloads (Pure)

Abstract

Grass cover erosion by overtopping waves is one of the main failure mechanisms of dikes. Transitions in cover type and geometry can increase the hydraulic load and are therefore identified as vulnerable locations for grass cover erosion. Two models are applied to the inner slope of the Afsluitdijk in the Netherlands to show how transitions can be included in overtopping models. Firstly, the analytical grass-erosion model is used to simulate the erosion depth along the profile for a six-hour storm. The model results show that the erosion depth is maximal at the end of the two slopes in the profile. Secondly, the effect of transitions on the hydraulic load is computed with a detailed hydrodynamic model. The model results show that geometric transitions significantly influence the shear stress, the normal stress and the pressure. Four vulnerable locations for grass cover erosion are identified based on the model results that are related to slope changes along the profile. Furthermore, the model results show that the overtopping flow is mainly affected by geometric transitions, while no effect of roughness transitions on the modelled forces was observed.
Original languageEnglish
Title of host publicationCoastal Engineering 2020
Number of pages9
DOIs
Publication statusPublished - 31 Dec 2020
Event37th International Conference on Coastal Engineering, ICCE 2020 - Virtual Conference
Duration: 13 Sep 202018 Sep 2020
Conference number: 37

Publication series

NameInternational Conference Proceedings of Coastal Engineering
PublisherAmerican Society of Civil Engineers
Volume36
ISSN (Print)0589-087X

Conference

Conference37th International Conference on Coastal Engineering, ICCE 2020
Abbreviated titleICCE 2020
CityVirtual Conference
Period13/09/2018/09/20

Fingerprint

Dive into the research topics of 'Modelling of wave overtopping flow over complex dike geometries: case study of the Afsluitdijk'. Together they form a unique fingerprint.

Cite this