{"refrec":{"BRefID":450209,"RR":"<b>Gruwez, V.; Adeli, A.; Willems, M.; Aertsens, T.; Sevindik, C.; Hofland, B.; Troch, P.; Reniers, A.; Lojek, O.; Tissier, M.; Verwaest, T.</b> (2026). Physical modelling of the Belgian Demonstrator(s): dune-dike interactions - the DUKEx-dataset. DuneFront report D12.3. Version 4.0. <i>FH reports</i>, 23_031_1. Flanders Hydraulics: Antwerp. 92 + 5 p. app. pp. <a href=\"https://dx.doi.org/10.48607/409\" target=\"_blank\">https://dx.doi.org/10.48607/409</a>","BEntID":448061,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". Version 4.0. <i>FH reports</i>, 23_031_1. Flanders Hydraulics: Antwerp. 92 + 5 p. app. pp. <a href=\"https://dx.doi.org/10.48607/409\" target=\"_blank\">https://dx.doi.org/10.48607/409</a>","DocTypID":13,"DocType":"Reports","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Gruwez, V.; Adeli, A.; Willems, M.; Aertsens, T.; Sevindik, C.; Hofland, B.; Troch, P.; Reniers, A.; Lojek, O.; Tissier, M.; Verwaest, T.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Gruwez, V. <i>et al.</i>","Englishabstract":"<span lang=\"EN-US\" dir=\"ltr\">Coastal communities need protection systems that remain reliable under extreme storms while retaining the capacity of sandy coasts to adapt. Dune-dike hybrid Nature-based Solutions (DD-Hybrid NbS) combine a hard dike with a dynamic dune. These can therefore contribute to both flood safety and nature-inclusive coastal management. Their design requires a quantitative understanding of how storm waves erode the dune, expose and load the dike, generate overwash and overtopping, and transport sediment. This report is DuneFront Deliverable D12.3 and presents the wave flume scale modelling experiments done in the DuneFront project to increase this understanding. The report includes: the experimental modelling setup, the test program and the experimental DUKEx-dataset (DUne diKE Experiments). The test program includes the</span><!--[endif] <!--[if !supportAnnotations] <!--[endif] <!--[if !supportAnnotations] Belgian Physical Twin to demonstrate the performance of Belgian demonstrators under design storm conditions.<br>The experiments were conducted from March to June 2026 in the 84 m long Large Wave Flume at Flanders Hydraulics. A 1:12.5 Froude-scaled mobile-bed model combined a 1/40 sandy foreshore slope and an erodible dune with a fixed, smooth and impermeable <!--[endif] <!--[if !supportAnnotations] <!--[endif] <!--[if !supportAnnotations] 1/2 dike slope. The test program comprised 15 (re)shaped dune geometry cases and in total 156 wave tests based on nine principal physical dune geometries. The tested dune geometries <!--[endif] <!--[if !supportAnnotations] were roughly derived (or schematized) from the demonstrators at Raversijde (BE), Middelkerke (BE), Katwijk (NL) and Dunkerque (FR). The test program was focused on varying dune volume (and dune crest width), keeping dune volume constant but varying the dune crest level and the distance between the dune and dike. Test conditions covered swash, collision, overwash and transition-to-inundation conditions. The HybridDune field configuration at the Sand Engine in the Netherlands was also reproduced at model scale.<br>Most tests used the same design-storm conditions to allow direct comparison between geometries. Additional tests examined experimental repeatability, a lower incident wave height, a changing tide and storm-surge level, and the influence of added free infragravity waves at the wave paddle. <!--[endif] <!--[if !supportAnnotations] The HybridDune tests reproduced wave conditions measured during a field storm and provide a basis for evaluating the transferability of laboratory results to prototype scale.<br>An integrated measurement system captured water-surface elevations, near-bed horizontal velocities and suspended-sediment response over the foreshore, pore-water pressures in the dune, dune and foreshore evolution, water temperature, and overtopping and overwash. An innovative robust measurement system was developed for the overtopping and overwash: an instrumented collection tank (overtopping tank) combined load-cell and <!--[endif] <!--[if !supportAnnotations] acoustic measurements to separate and determine the overtopped water volume and the dry mass of overwashed sediment. Dedicated Python workflows were developed for signal filtering, LiDAR data-p<!--[endif] <!--[if !supportAnnotations] rocessing and bed-profile reconstruction. The report also derives the procedure for calculating mean overtopping discharge and overwashed sediment mass. Data gaps and faulty records are documented so that appropriate tests can be selected for subsequent analyses.<br>This campaign provides the experimental foundation for future validation of XBeach-SB, XBeach-NH (or SWASH) and for numerically extending the experimental database beyond the tested conditions to demonstrate the efficiency of the hybrid system compared to standalone dune and dike coastal defense systems (D12.5). For coastal authorities, the acquired DUKEx-dataset can support transparent comparison of adaptation options before field implementation. It can also contribute to designs that combine a dependable hard safety line with the adaptive and ecological value of dunes. The present report does not yet identify an optimal geometry. Design and policy decisions should therefore use the su<!--[endif] <!--[if !supportAnnotations] <!--[endif] <!--[if !supportAnnotations] bsequent validated-model analyses, accounting explicitly for scale effects, long-crested flume waves and measurement limitations, and remain tailored to local storm climate, bathymetry, sediment characteristics and maintenance requirements (D14.5).<br>The DUKEx-dataset presented here will also be used further in other work packages in the DuneFront project: in the development of the Predictive Digital Twin (WP13) and consequently the development of the Decision Support System (WP14).</span><!--[endif] <!--[if !supportAnnotations] <!--[endif] <!--[if !supportAnnotations] <!--[endif] <!--[if !supportAnnotations] <!--[endif] <!--[if !supportAnnotations] </body> </body> </body> ","AbstractOtherLang":null,"BibLvlCode":"MS","StandardTitle":"Physical modelling of the Belgian Demonstrator(s): dune-dike interactions - the DUKEx-dataset. 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