10c). The north-eastern coast of the UK experienced waves between 3–6 m, much like the eastern coast of Scotland, although only one possible deposit has so far been found (Boomer et al., 2007). The southern North Sea, especially the coasts of the UK and Dogger Bank show significant differences, largely due to the alteration of the coastline, but there are no known observations here. Wave heights are predicted to be around 1 m on the UK coast and up to 5 m on the northern coast of Doggerland. The maximum elevation of Doggerland here is less than 10 m, with large areas of less than 5 m. It is therefore possible that much of Doggerland would have
been flooded by such a wave. Due to the inclusion of the Doggerland island, the northern Selleckchem Saracatinib coast of mainland Europe experiences maximum wave heights of 1 m or less – much lower than if modern bathymetry is used. The wave also reaches the western coast of the UK, with maximum wave heights of around 1 m on the Cornwall and Devon coasts. Similarly we predict waves of up to 5 m on the western coast of the Republic of Ireland. On a more local scale locations such as gauge 7 show a significant shift in the arrival time of the waves (9). Many locations show a slight increase (e.g. 30) of a few metres, which improves the match to estimated
run-up heights (9), whilst a number show very little difference (e.g. 15). All other locations selleck where Storegga tsunami deposits are found show a good match to observed data using either palaeo- or modern bathymetry, with the exception of the Faroe Islands where the wave height is underestimated and the inclusion of palaeobathymetry makes little difference. The modern result is very similar to that of Bondevik et al. (2005) who postulate that the wave is amplified in the fjord. We therefore conclude that palaeobathymetry can have a significant effect old at a local scale, similar to the increase in bathymetric and coastal resolution, but has little effect on the basin-scale results.
We also note that at some locations, such as the Faroe Islands there is little difference in the modelled wave height, despite a significant drop in relative sea level of around 20 m in the region. However, the changes in relative sea level also affect the propagation of the wave along the wave path to the Faroe Islands, so it is overly simplistic to use the modern bathymetry and account for the change in relative sea level at a single location. The discrepancy here may be due to local funnelling or amplification effects and a further increase of resolution may resolve this. Videos of these two simulations are available in the supplementary material. The idea behind multiscale resolution simulations is that areas of interest can be simulated at an appropriate resolution without the expense of computational effort in areas where high resolution is not required.