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CoMIBBS - 2008

Composite Modelling of the Interactions Between Beaches and Structures

The aim of CoMIBBS is to improve the service provided by hydraulic laboratories by developing techniques and good practice guidelines for composite modelling, which is the integrated and balanced use of physical and numerical models. Composite modelling techniques will be developed and tested for four generic types of seabed / fluid / structure interactions. A set of practical guidelines will be produced, detailing the composite modelling techniques tested during the project.

The main objectives of CoMIBBS are to:
  • Analyse the functionality of physical and numerical models and to outline the composite modelling approaches to be evaluated.
  • Investigate the optimum choice of models for addressing generic problems of seabed / structure interaction.
  • Produce guidelines on the strengths and weaknesses of a range of physical and numerical models.
Produce best practice guidelines on composite modelling techniques of the interactions between beaches and structures.

Within the CIEM an emerged (0.15m freeboard) and submerged (-0.25m freeboard) porous structure layout were tested in a sandy bottom with 250 µm size. Concrete blocks of 14.5Kg and 19.5Kg were used to build the structure and bestow a porosity value of about 0.4 for the structures. The structure was built on 1/15 slope at 1m water depth and nine irregular erosive wave conditions were tested (Hs ranging between 0.2 and 0.3 m and Tp between 1.63 and 3.5 s). The free surface was measure with 9 acoustic and 15 resistance gauges. Eight 3-D acoustic-Doppler velocimeters (Nortek Vectrino) and six electromagnetic current weters S-type were used to measure the current velocities around and inside the structures.