Multi-scale modelling of waves propagation on the Norwegian Coast

Sánchez, Alonso Madrigal

http://hdl.handle.net/10400.1/12363

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Authors

Sánchez, Alonso Madrigal

Advisor(s)

Bihs, Hans

Jacob, José

Abstract(s)

Fjords coastlines are attributed to glaciers as the main agent of erosion. Thus, fjords are characterised by an irregular coastline con guration and rapid changes in their deep and steep slopes. These features generate a unique behaviour on the ocean wave propagation and on the water hydrodynamics. Norwegian coastline has environmental conditions to support diverse aquaculture developments along the coast. Therefore, aquaculture in Norway is considered a growing eld with an enormous potential especially in o shore locations. The development of numerical tools, such as wave models, will produce a huge improvement on the di erent technologies used nowadays. To achieve this huge engineering challenge a simulation of the ocean waves reaching the Norwegian fjords will be analysed using coupled numerical models. This study proposed a combined use of two di erent numerical models, cascade of wave models, to utilise the strengths of the models while reducing their disadvantages. For example, spectral wave model such as STWAVE is fast in open ocean but not able to capture the di raction phenomenon, shallow water model such as REEF3D::SFLOW is able to capture most wave transformation phenomenon but limited by water depth; Computational Fluid Dynamic (CFD) model such as REEF3D::CFD captures threedimensional details of water wave but is computationally costly. The results obtained from the large domain and coarse grid model will serve as the input to the next region with middle resolution and a re ned grid size. This is carried on until the results for the area of interest are obtained. A rst step validating the reliability of REEF3D::SFLOW was carried out through the use of a submerged bar case. During the process of testing the feasibility of the cascade of wave models methodology, di erent models were evaluated for speci c domain and topography. As a result, only two models were applied on the nal simulation: STWAVE and REEF3D::CFD. Thus, the combined methodology resulted useful to obtain a rough estimation of the wave propagation and transformation outside the fjords and its potential e ects over Flat ya sh farm development. It can be also an important input for their sh cage design.