RUN-UP, BOUNDARY LAYERS AND SHEAR STRESSES BENEATH SHOALING TSUNAMIS

  • Bjarke Eltard Larsen
  • David R. Fuhrman

Abstract

While the tsunami propagation, run-up and inundation has received considerable attention in literature, the associated boundary layer dynamics and induced sediment transport have received relatively little attention. Recently, Williams and Fuhrman (2016) simulated a series of tsunami scale boundary layers, emphasizing that they are simultaneously both current- and wave-like due to their long duration yet unsteady nature. They viewed the tsunami as a time varying current, something that has also been done by Larsen et al. (2017) and Larsen et al. (2018) in studies of tsunami-induced scour around monopile foundations. This approach is valid sufficiently far off-shore, but nearshore, the effects of the free-surface will inevitably become important. While difficult due to the large scales involved, the run-up and inundation can likewise be studied experimentally (Sriram et al. 2016). In this work the run-up process of full-scale tsunamis will be simulated in detail using CFD, which can naturally resolve shorter dispersive waves, wave breaking and boundary layer dynamics.

References

Fuhrman, D.R. & Larsen, B.E (2018). A solution to the over-production of turbulence beneath surface waves in RANS models. ICCE 2018, abstract no. 1467.

Larsen, B.E., Fuhrman, D.R. & Sumer, B.M (2017). Tsunami-induced scour around monopile foundations. Coast. Eng. 129. pp 36-49.

Larsen, B.E., Arbøll, L.K., Kristoffersen, S. F., Carstensen, S. & Fuhrman, D. R. (2018). Experimental study of tsunami-induced scour around a monopile foundation. Coast. Eng. 138. pp 9-21.

Larsen, B.E. & Fuhrman, D.R. (2018) On the overproduction of turbulence beneath surface waves in RANS models. J. Fluid Mech. (in revision).

Madsen, P.A., Fuhrman, D.R. & Schäffer, H. (2008) On the solitary wave paradigm for tsunamis. J. Geophys. Res. 113. Article no. C12012

Sriram, V., Didenkulova, I., Sergeeva, A, & Schimmels, S. (2016). Tsunami evolution and run-up in a large scale experimental facility. Coast. Eng. 111. pp 1-12.

Williams, I., & Fuhrman, D. R. (2016). Numerical simulation of tsunami-scale wave boundary layers. Coast. Eng. 110. pp 17-31.

Published
2018-12-30
How to Cite
Larsen, B. E., & Fuhrman, D. R. (2018). RUN-UP, BOUNDARY LAYERS AND SHEAR STRESSES BENEATH SHOALING TSUNAMIS. Coastal Engineering Proceedings, 1(36), currents.24. https://doi.org/10.9753/icce.v36.currents.24