1,721,029 research outputs found
Preannuncio di un evento di maremoto. Parte 2: Previsione in tempo reale delle onde in costa con un nuovo modello numerico dispersivo in frequenza
No full textApplication of wavelet transform analysis to landslide generated waves
No full textThe aim of this paper is to illustrate the results of a preliminary study on aerial landslide-generated waves, which has been mainly intended to establish a method for analyzing water surface records. Some simple physical experiments, reproducing the Scott Russell's wave generator, were carried out in a small two-dimensional wave flume; the Wavelet Transform (WT) is applied to analyze wave measurements and it is shown that useful information can be obtained by means of this technique, The celerity of impulsively generated waves, reflection by an overflow structure and seiching phenomena of the flume are studied. A discussion of the results along with some remarks about ongoing research is also given. (C) 2002 Elsevier Science B.V. All rights reserved
Studio sperimentale delle onde impulsive generate dalla caduta di frane nei bacini artificiali. Parte I: Descrizione del modello fisico e delle metodologie di analisi dei dati
No full textStudio della penetrazione del moto ondoso nei porti mediante l’ applicazione di un modello di boussinesq
No full textNuovi esperimenti tridimensionali sulle onde di maremoto generate da frane su una costa rettilinea
No full textThree-dimensional experiments on landslide generated waves at a sloping coast
No full textThis paper describes new three dimensional experiments on water waves generated by landslides. The landslide is reproduced by a rigid elliptical body, sliding along an inclined plane (slope of 1/3, 1 vertical, 3 horizontal). The generated water waves are free to propagate both offshore and alongshore, since the plan dimensions of the used wave tank are of at least one order of magnitude larger than the width of the landslide, which can be considered to be a scale of the wave length. The experimental study has been carried out reproducing both subaerial and partially submerged landslides. The wave generation process is studied by means of video records of the near field flow and measurement of the landslide movement; the properties of the waves propagating along the coast are described on the basis of runup gauges. The waves observed during the experiments always present first a crest and then a trough; as the first wave propagates away from the generation area the crest tends to become smaller than the trough and the maximum runup along the coast is given by the second or by the third wave. An important feature is that the observed runup along the coast firstly grows with the distance from the generation area, it reaches a maximum value at about two times the width of the landslide. and then decreases. An estimate of the celerity at which the waves propagate along the coast is given on the basis of gauge measurements: it results that the crests propagate faster than the troughs, and the wave period increases. (C) 2009 Elsevier B.V. All rights reserved
Trattamento del frangimento e della condizione di riflessione in un modello di integrazione agli elementi finiti della mild-slope equation
No full textClosure to "Treatment of wave breaking and total absorption in a mild-slope equation FEM model" by Gian Mario Beltrami, Giorgio Bellotti, Paolo De Girolamo, and Paolo Sammarco
No full textPreannuncio di un evento di maremoto. Parte 3: SPH modelling of non linear shallow water equations
No full textMorphological changes of a beach cross-shore profile under the attack of different sequences of sea-states
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