Downloaded from orbit.dtu.dk on: Oct 05, 2021 D5.3 Interaction between currents, wave, structure and subsoil Christensen, Erik Damgaard; Sumer, B. Mutlu; Schouten, Jan-Joost; Kirca, Özgür; Petersen, Ole; Jensen, Bjarne; Carstensen, Stefan; Baykal, Cüneyt; Tralli, Aldo; Chen, Hao Total number of authors: 19 Publication date: 2015 Document Version Publisher's PDF, also known as Version of record Link back to DTU Orbit Citation (APA): Christensen, E. D., Sumer, B. M., Schouten, J-J., Kirca, Ö., Petersen, O., Jensen, B., Carstensen, S., Baykal, C., Tralli, A., Chen, H., Tomaselli, P. D., Petersen, T. U., Fredsøe, J., Raaijmakers, T. C., Kortenhaus, A., Hjelmager Jensen, J., Saremi, S., Bolding, K., & Burchard, H. (2015). D5.3 Interaction between currents, wave, structure and subsoil. 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MERMAID mermaidproject.eu Seventh Framework Programme Theme [OCEAN.2011-1] “Innovative Multi-purpose off-shore platforms: planning, design and operation” Grant Agreement no.: 288710 Start date of project: 01 Jan 2012 - Duration: 48 month D5.3 Interaction between currents, wave, structure and subsoil Deliverable: D5.3 Interaction between currents, wave, structure and subsoil Nature of the Deliverable: Report/D5.3 Due date of the Deliverable: July 2014 Actual Submission Date: 26th of February 2015 Dissemination Level: Public Produced by: Erik Damgaard Christensen Erik Damgaard Christensen, B. Mutlu Sumer, Jan‐Joost Schouten, V.S. Özgür Kirca, Ole Petersen, Bjarne Jensen, Stefan Carstensen, Cüneyt Contributors: Baykal, Aldo Tralli, Hao Chen, Pietro Danilo Tomaselli, Thor Ugelvig Petersen, Jørgen Fredsøe, Tim C. Raaijmakers, Andreas Kortenhaus, Jacob Hjelmager Jensen, Sina Saremi, Karsten Bolding, Hans Burchard Work Package Leader Jan‐Joost Schouten (Deltares) Responsible: Erik Damgaard Christensen Reviewed by: B Mutlu Sumer/Erik Damgaard Christensen Version Date Revised Pages Description of Changes 1.0 14 May 2014 1st layout released, (J. Schouten) 1.1 26 Feb. 2015 All Final report MERMAID 288710 2 Table of contents 1 Introduction .................................................................................................................................. 4 1.1 Background ........................................................................................................................... 4 1.2 MERMAID and Work Package 5 ......................................................................................... 4 1.2.1 Deliverable D5.3 ............................................................................................................ 4 2 Dispersion processes related to Multi-use offshore platforms ..................................................... 7 2.1 Modelling of dispersion processes related to marine operations .......................................... 7 2.1.1 Introduction .................................................................................................................... 7 2.1.2 Spill during dredging operations .................................................................................... 9 2.1.3 Sedimentation inside the barge ...................................................................................... 9 2.1.4 Overflow plumes .......................................................................................................... 11 2.1.5 Air entrainment in overflow shafts .............................................................................. 17 2.1.6 Dumping of sediment spoils ........................................................................................ 19 2.1.7 Conclusions .................................................................................................................. 21 2.1.8 References .................................................................................................................... 21 2.2 Dispersion in wave boundary layers ................................................................................... 23 2.2.1 The process of longitudinal dispersion in an oscillatory boundary layer .................... 24 2.2.2 Description of the numerical model ............................................................................. 26 2.2.3 Results .......................................................................................................................... 30 2.2.4 Summary and Conclusion ............................................................................................ 39 2.2.5 References .................................................................................................................... 40 3 Current with varying density interaction with vertical piles ...................................................... 43 3.1 Physical and numerical modelling ...................................................................................... 43 3.1.1 Physical models............................................................................................................ 46 3.1.2 Numerical models ........................................................................................................ 51 3.2 Parameterisation of the effect of unresolved structures on stratified flow .......................... 66 3.2.3 Discussion .................................................................................................................... 72 3.3 Modelling of mixing of saline layers, Ocean-models ......................................................... 73 3.4 References ........................................................................................................................... 79 3.5 Modelling of flow through a mussel farm ........................................................................... 82 3.5.1 Introduction .................................................................................................................. 82 3.5.2 Methodologies .............................................................................................................. 83 3.5.3 Example applications ................................................................................................... 85 3.5.4 Borssele Offshore Wind Farm ..................................................................................... 91 3.5.5 Discussion and further work ........................................................................................ 94 MERMAID 288710 3 3.5.6 References .................................................................................................................... 95 4 Wave-structure interaction with structural components in a Multi-Use platform ..................... 97 4.1 Hydraulic model tests on OWC modules of platforms ....................................................... 97 4.1.1 Literature review of OWC devices .............................................................................. 97 4.1.2 Set-up of model tests and test programme ................................................................. 100 4.2 Breaking wave interaction with secondary structures- physical and numerical analyses . 103 4.2.1 Introduction ................................................................................................................ 103 4.2.2 Breaking Waves ......................................................................................................... 103 4.2.3 Air-entrainment in breaking waves ............................................................................ 107 4.2.4 Wave loads on a vertical structure ............................................................................. 110 4.2.5 Breaking waves-induced forces ................................................................................. 112 4.2.6 A CFD approach to design the secondary structures of MUP's ................................. 113 4.2.7 References .................................................................................................................. 119 4.3 Methods for current and wave interaction with fish cages: A review ............................... 123 4.3.1 Introduction ................................................................................................................ 123 4.3.2 Main parameters in the analysis of fish cages ............................................................ 124 4.3.3 Hydrodynamic Flow Model ....................................................................................... 127 4.3.4 Hydrodynamic force model ....................................................................................... 128 4.3.5 Structural model ......................................................................................................... 130 4.3.6 Hydroelastic analysis of net structure ........................................................................ 132 4.3.7