Wavenumber–frequency analysis of the landslide-generated tsunamis at a conical island |
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| Institution: | 1. University of Roma Tre, DSIC, Via Vito Volterra, 62, Rome 00146, Italy;2. University of L''Aquila, DICEAA-LIAM, Piazzale Pontieri 1, L''Aquila 67100, Italy;1. Departamento de Análisis Matemático, Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos s/n, 29080 Málaga, Spain;2. Instituto Español de Oceanografía, Centro Oceanográfico de Málaga, Puerto Pesquero s/n, 29640 Fuengirola, Spain;3. Instituto Español de Oceanografía, Centro Oceanográfico de Cádiz, Puerto Pesquero, Muelle de Levante s/n, 11006 Cádiz, Spain;4. Departamento de Matemática Aplicada, Escuela Politécnica Superior, Universidad de Málaga, Campus de Teatinos s/n, 29071 Málaga, Spain;5. Instituto de Ciencias del Mar, CSIC, Passeig Maritim, 37–49, 08003, Barcelona, Spain;1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;2. Hydro-environmental Research Centre, School of Engineering, Cardiff University, Cardiff CF10 3AT, United Kingdom |
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| Abstract: | In this paper we investigate the propagation of tsunamis generated by landslides around the coast of an island to understand the propagation and trapping mechanisms of the waves. Records of shoreline displacement have been processed using the wavenumber–frequency analysis (k–f). We identify the dispersion relation followed by the waves that propagate alongshore. It appears that the 0th-order edge wave mode is the only one relevant for shoreline run-up. Furthermore, it is shown that the edge wave dispersion relation is a quantitative tool to estimate the phase and group wave celerities. A very good agreement is found when comparing the wave celerities as calculated from the experimental records, against those predicted by the edge wave theory. Furthermore the analysis of the tsunami around the island has been carried out by means of the two-dimensional k–f. Using as input data a high-space resolution dataset of free surface elevations it is found that other modes, both trapped (1st-order edge waves) and non-trapped (free radiating waves), occur during the propagation. |
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