EGU General Assembly 2022
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Inertial waves excited by topography 

Fabian Burmann and Jerome Noir
Fabian Burmann and Jerome Noir
  • ETH Zürich, Institute of Geophysics, Department of Earth Sciences, Zürich, Switzerland (

We bring together two important features of planetary cores: 1) wave propagation in the fluid and 2) topography of the fluid-solid interface. On one hand, inertial waves contribute to the maintenance of quasi geostrophic motions or to the formation of elongated structures in rotating turbulence. On the other hand, topography of the core-mantle boundary has been prososed in various seismological and geodynamical studies and can modify the fluid flow in the core, for example, by altering global fluid modes. Here, we focus on inertial waves excited by topography.

We present results from a combined numerical and experimental investigation of inertial wave motion which is forced by an oscillating topography. To allow comparison with the theory of linear inertial waves, we use a complex topography characterised by a single wavenumber in the spectral domain. Both, the wavenumber and the frequency of the oscillations are varied, allowing us to characterise the transport of kinetic energy at different length scales as well as the interactions of direct and reflected inertial waves. 

How to cite: Burmann, F. and Noir, J.: Inertial waves excited by topography , EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-8071,, 2022.

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