How does multiscale modelling and inclusion of realistic palaeobathymetry affect numerical simulation of the Storegga Slide tsunami?. Hill, J., Collins, G. S, Avdis, A., Kramer, S. C, & Piggott, M. D Ocean Modelling, 83(0):11–25, November, 2014.
doi  abstract   bibtex   
Abstract The ∼8.15 ka Storegga submarine slide was a large (∼3000 km3), tsunamigenic slide off the coast of Norway. The resulting tsunami had run-up heights of around 10–20 m on the Norwegian coast, over 12 m in Shetland, 3–6 m on the Scottish mainland coast and reached as far as Greenland. Accurate numerical simulations of Storegga require high spatial resolution near the coasts, particularly near tsunami run-up observations, and also in the slide region. However, as the computational domain must span the whole of the Norwegian-Greenland sea, employing uniformly high spatial resolution is computationally prohibitive. To overcome this problem, we present a multiscale numerical model of the Storegga slide-generated tsunami where spatial resolution varies from 500 m to 50 km across the entire Norwegian-Greenland sea domain to optimally resolve the slide region, important coastlines and bathymetric changes. We compare results from our multiscale model to previous results using constant-resolution models and show that accounting for changes in bathymetry since 8.15 ka, neglected in previous numerical studies of the Storegga slide-tsunami, improves the agreement between the model and inferred run-up heights in specific locations, especially in the Shetlands, where maximum run-up height increased from 8 m (modern bathymetry) to 13 m (palaeobathymetry). By tracking the Storegga tsunami as far south as the southern North sea, we also found that wave heights were high enough to inundate Doggerland, an island in the southern North Sea prior to sea level rise over the last 8 ka.
@ARTICLE{Hill2014-jo,
  title    = "{How does multiscale modelling and inclusion of realistic
              palaeobathymetry affect numerical simulation of the Storegga
              Slide tsunami?}",
  author   = "Hill, Jon and Collins, Gareth S and Avdis, Alexandros and Kramer,
              Stephan C and Piggott, Matthew D",
  abstract = "Abstract The ∼8.15 ka Storegga submarine slide was a large (∼3000
              km3), tsunamigenic slide off the coast of Norway. The resulting
              tsunami had run-up heights of around 10--20 m on the Norwegian
              coast, over 12 m in Shetland, 3--6 m on the Scottish mainland
              coast and reached as far as Greenland. Accurate numerical
              simulations of Storegga require high spatial resolution near the
              coasts, particularly near tsunami run-up observations, and also
              in the slide region. However, as the computational domain must
              span the whole of the Norwegian-Greenland sea, employing
              uniformly high spatial resolution is computationally prohibitive.
              To overcome this problem, we present a multiscale numerical model
              of the Storegga slide-generated tsunami where spatial resolution
              varies from 500 m to 50 km across the entire Norwegian-Greenland
              sea domain to optimally resolve the slide region, important
              coastlines and bathymetric changes. We compare results from our
              multiscale model to previous results using constant-resolution
              models and show that accounting for changes in bathymetry since
              8.15 ka, neglected in previous numerical studies of the Storegga
              slide-tsunami, improves the agreement between the model and
              inferred run-up heights in specific locations, especially in the
              Shetlands, where maximum run-up height increased from 8 m (modern
              bathymetry) to 13 m (palaeobathymetry). By tracking the Storegga
              tsunami as far south as the southern North sea, we also found
              that wave heights were high enough to inundate Doggerland, an
              island in the southern North Sea prior to sea level rise over the
              last 8 ka.",
  journal  = "Ocean Modelling",
  volume   =  83,
  number   =  0,
  pages    = "11--25",
  month    =  nov,
  year     =  2014,
  keywords = "Submarine slide; Storegga; Tsunami; Numerical modelling;
              Multiscale",
  issn     = "1463-5003",
  doi      = "10.1016/j.ocemod.2014.08.007"
}

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