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Relief resolution effect on the tsunami numerical modelling
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 10th Congress of the Balkan Geophysical Society, Sep 2019, Volume 2019, p.1 - 5
Abstract
The relief resolution effect on the tsunami numerical modelling was evaluated in this study. One hypothetical tsunamigenic source with earthquake magnitude 7.5 was modelled in the area of the Shabla-Kaliakra seismic zone in the northeastern Bulgarian Black Sea coast. The resolution of computational grids on which the numerical simulations were made are 50 m, 250 m and 500 m. Synthetic mareograms were calculated at a number of points near the coastline and the results obtained by different grids, were compared. The vertical water column on the coastline generated by the modelled event is evaluated, indicating that higher resolution in the finer grid leads to more realistic results. Radiation pattern of the tsunami waves has insignificant changes using relief grids with different steps. In general the extreme amplitudes of the modelled tsunami vary with different relief resolution. The phase shift in the wave trains is more significant for a specific location that causes important changes in the estimation of vertical water column on the shore at this point. Further that it is a basis of over or underestimation of the local tsunami hazard.