Analysing the impact of bottom friction on shallow water waves over idealised bottom topographies. (English) Zbl 1528.76009
Summary: Analysing the impact of bottom friction on shallow water waves over bottom terrains is important in areas including environmental and coastal engineering as well as the oceanic and atmospheric sciences. However, current theoretical developments rely on making certain limiting assumptions about these flows and thus more development is needed to be able to further generalise this behaviour. This work uses Adomian decomposition method (ADM) to not only develop semi-analytical formulations describing this behaviour, for flat terrains, but also as reverse-engineering mechanisms to develop new closed-form solutions describing this type of phenomena. Specifically, we respectively focus on inertial geostrophic oscillations and anticyclonic vortices with finite escape times in which our results directly demonstrate the direct correlation between the constant Coriolis force, the constant bottom friction, and the overall dynamics. Additionally, we illustrate elements of dissipation-induced instability with respect to constant bottom friction in these types of flows where we also demonstrate the connection to the initial dynamics for certain cases.
MSC:
| 76B15 | Water waves, gravity waves; dispersion and scattering, nonlinear interaction |
| 76U05 | General theory of rotating fluids |
| 76M45 | Asymptotic methods, singular perturbations applied to problems in fluid mechanics |
| 86A05 | Hydrology, hydrography, oceanography |
Keywords:
rotating shallow water flow; linear friction law; Adomian decomposition method; inertial geostrophic oscillation; anticyclonic vortex; Coriolis forceSoftware:
FullSWOFReferences:
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