Physical Evaluation Of The Hydrodynamic Stability Of An Eco-engineered Armouring Unit

Jorge Gutiérrez Martínez, Maor Bezner, Auke Molenkamp, Jeroen van den Bos, Bas Hofland, Philippe Leblanc, Andrew Rella, Yaeli Rosenberg, Ido Sella

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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ECOncrete®‘s Coastalock is an ecologically designed armour unit, providing an alternative and/or a complement to traditional armour layers with ecologically enhanced armouring that provides shoreline stabilization, while also creating well-defined local ecosystems that mimic natural rock pools. The 2D physical model tests performed at TU Delft focused on the stability, reflection and overtopping of a slope with regularly placed single layer Coastalock armour. The 2V:3H slope had an impermeable core, no wave breaking on the foreshore and no rock toe. The stability was seen to double, with stability number Ns (Ns= Hs/ΔDn50) increasing from roughly 2 to 4 and above, by increasing the porosity between the blocks from spacing the units from 0percent to 25percent. So less concrete use led to more stability. The mean overtopping discharge could be characterized by a roughness factor of gamma_f = 0.610 (for 25percent spacing). A key goal of the Coastalock development is to demonstrate that with the use of innovative eco-engineered armour unit design it is now possible to add ecological considerations into the design process to promote biodiversity and provide ecosystem services, achieving both structural and ecological goals.
Original languageEnglish
Title of host publicationCoastal Engineering 2022
Subtitle of host publicationProceedings of 37th International Conference
EditorsDan Cox
PublisherASCE - COPRI
Number of pages11
ISBN (Electronic)978-0-9896611-6-4
Publication statusPublished - 2023
EventICCE 2022: 37th Conference on Coastal Engineering - International Convention Centre, 14 Darling Drive, Sydney, Australia
Duration: 4 Dec 20229 Dec 2022

Publication series

NameProceedings of the Coastal Engineering Conference
PublisherASCE - COPRI
ISSN (Print)0161-3782


ConferenceICCE 2022
Abbreviated titleICCE 2022
Internet address


  • Nature Inclusive Design (NID)
  • biodiversity
  • marine habitat
  • ecological engineering
  • coastal protection
  • bioenhancing concrete
  • single layer armour unit
  • physical modelling


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