Citation: RENZI, E. ... et al, 2014. Wave-power absorption from a finite array of oscillating wave surge converters. Renewable Energy, 63, Additional Information:• NOTICE: this is the author's version of a work that was accepted for publication in Renewable Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Re-
AbstractSemi-analytical and fully numerical modelling is developed in the framework of the inviscid potential flow theory to investigate the dynamics of a wave farm made by flap-type wave energy converters in the nearshore. The hydrodynamic parameters and the efficiency of the system in typical layouts are calculated with both models. Good agreement is shown between the two approaches. Parametric analysis undertaken with the semi-analytical model allows to identify a near-resonant phenomenon which is responsible for increasing the absorbed power by the single elements of the array. Such result could be used as a preliminary design criterion. The numerical model is then applied to analyse a configuration of practical engineering interest, i.e. an array of two staggered converters. The dynamics arising in this more complex system is explained, showing that non-symmetric layouts can be less effective.
[1] This paper presents new physical model experiments on tsunamis generated by landslides at the coast of a conical island. The experiments have been carried out in a large wave tank; the radius of the island coastline and the falling height of the landslide have been varied during the experimental campaign. The landslide is reproduced by a solid body shaped as a half of an ellipsoid. Tsunami runup is measured using special wave gauges; a detailed analysis of the runup along the coastline is presented, with special attention to the role of each wave in the packet and to the evolution of the envelope of the first group of waves.
We present a depth-integrated equation for the mechanics of propagation of lowfrequency\ud
hydroacoustic waves due to a sudden bottom displacement associated with\ud
earthquakes. The model equation can be used for numerical prediction in large-scale\ud
domains, overcoming the computational difficulties of three-dimensional models and so\ud
creating a solid base for tsunami early warning systems
[1] The role of free modes of oscillation of coastal areas in tsunami amplification at the coast is investigated here. A finite element numerical model for modal analysis was applied and the numerically calculated natural frequencies were compared to those resulting from the spectra of measured sea level time series. Two case studies have been selected: that of Poverty Bay (New Zealand); and that of Kuluk Bay (Adak Island, Alaska, USA). The natural modes of the sea areas that extend in front of these locations are shown to play an important role in tsunami amplification at both the considered bays. In fact, the enhancement of wave height is found to be related to both the small-scale resonance controlled by the coastal shape, and the large-scale one governed by the continental shelf bathymetry. In particular, the model application to Poverty Bay reveals that some of the continental shelf modes are more energetic and occur at frequencies higher than the bay fundamental one. These modes are identified as both cross-shelf modes and trapped edge waves. On the other hand, the application to Kuluk Bay shows that geographical entrapment can be relevant for chain islands, making the bay and the continental shelf modes almost coincident.Citation: Bellotti, G., R. Briganti, and G. M. Beltrami (2012), The combined role of bay and shelf modes in tsunami amplification along the coast,
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