Numerical modeling of waves for a tsunami early warning system

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ηR1(m) ηR2(m) Numerical modeling of waves for a tsunami early warning system 0.02 0.01 0 −0.01 −0.02 0 2 4 6 8 10 12 14 16 18 20 0.02 0.01 0 −0.01 −0.02 0 2 4 6 8 10 12 14 16 18 20 Figure 4.22: Comparison of the numerical data (thick black line) and the analytical solution one (black thin line) The general properties of the wave field are predicted with satisfactory accuracy by both mathematical models. Quantities of fundamental engineering insterest such as the maximum elevation are very well reproduced. The biggest difference in the comparison of figure 4.22 appears in the first incoming wave, which is overestimated in the analytical model based on shallow water equations. 4.5 Landslide generated waves around a conical island Further physical experiments which aims at studying the tsunami wave field generated by landslide have been carried out in a large wave tank at the Research and Experimentation Laboratory for Coastal Defence (LIC) of the Technical University of Bari, Italy, in cooperation with the Environmental and Maritime Hydraulics Laboratory Umberto Messina (LIAM) of the University of L’Aquila, Italy. They simulate landslide body falling on the flank of a conical island. The conical island was built in order to approximatly Università degli Studi di Roma Tre - DSIC 67 t(s)
Numerical modeling of waves for a tsunami early warning system reproduce in scale 1:1000 Stromboli island, south Tyrrhenian Sea, Italy (Tinti et al., 2006b). As mentioned in the Introduction Stromboli is a volcanic island, that was interested by landslide dislocations which falling into the sea, provocates tsunami waves, dangerous especially for the island shoreline. Most of the tsunamis studies pose attention to the wave propagation and the inundations of the coasts ahead the landslide/earthquake which generate it. The case when the tsunami is generated close to a small island needs of detailed analysis for the wave field entrapped close to the shoreline. Two different wave pattern are generated when aerial or partially submerged landslides impact the sea water surface: one which propagates toward the direction of the landslide motion and has circular fronts, the other which is entrapped close to the shoreline, i.e. around the island. The physical model results have been used to validate the numerical model, in terms of results reliability and application’s methods, and to further comprend and characterize the phenomena. Figure 4.23: Sketch of the layout of the conical island experiments. Università degli Studi di Roma Tre - DSIC 68
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Università degli studi ROMA TRE Ph
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To my father Michele, my mother Ant
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Abstract A numerical model based on
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Sommario Un modello numerico basato
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Contents 1 Introduction 3 1.1 Tsuna
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List of Figures 1.1 Principal phase
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xiii 4.13 Panels a and b: absolute
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4.32 Comparison of the free surface
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xvii 5.8 Numerical results of the S
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List of Tables 4.1 Radial and Angul
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Numerical modeling of waves for a t
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Numerical modeling of waves for a tsunami early warning system

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