1,721,166 research outputs found
Prove su modello fisico e matematico per lo studio della circolazione idrodinamica e della navigabilità a seguito della realizzazione di un sistema di dighe a scogliera distanziate, parzialmente sommerse, a Bagheria (PA), in località ASPRA. Rapporto di ricerca del Dipartimento di Difesa del Suolo dell'Università della Calabria
No full textProve su modello fisico e matematico per lo studio della circolazione idrodinamica e della navigabilità a seguito della realizzazione di un sistema di dighe a scogliera distanziate, parzialmente sommerse, a Bagheria (PA), in località ASPRA
Discussion on "Incipient motion of coarse particles on a slope by regular and irregular waves"
No full textCapabilities and limits for ADVP measurements at breaking waves and bores
No full textThis paper presents experience from the use of an Acoustic Doppler Velocity Profiler in the surf zone over a large-scale experimental barred beach. In the first part of the paper, attention is focused on the description of a proper ADVP set-up and on the determination of relationships for the horizontal and vertical velocity components valid for the oscillatory flow case. In the second part, horizontal velocity component data from the ADVP are compared to the pre-processed measurements from two other velocity measuring devices for breaking waves, as well as near the end of the surf zone. As expected, in the outer region of the surf zone velocity measurements appear influenced by air entrainment. In the bore-like region where the effects of wave breaking are less intense and where the wave is reforming, the horizontal velocity is in reasonable agreement with the rest of the measurements. Although the ADVP appears much noisier than other instruments, the role of bubbles in outer zone is prevalent in its measuring error and gives a large underestimation. Furthermore, for the adopted experimental conditions, the analysis shows that the use in the bore-like region of relationships for the horizontal velocity component that are valid for a uniform flow generates a negligible error
Surface roller of breaking waves at barred beaches
No full textA new methodology to determine the area of the surface roller of breaking waves is proposed and verified. The method is based on two existing undertow formulations and determines the cross-shore variation of the surface roller with the use of the vertical distribution of the undertow and of the time variation of the wave surface elevation. A new set of data from a large-scale laboratory experiment over a fixed-bed barred beach has been considered. For the plunging breaker case, the measured values of the cross-sectional area of the surface roller from the present method compare favorably with the calculated values from three existing formulae. For the spilling breaker case the calculated values capture the cross-bar variation of the surface roller with an overestimation. Both breaker types present a linear decay of the surface roller over the bar at transects past the breaking point
Attività di ricerca concernenti la valutazione dei tempi di down-time per il porto di Gioia Tauro. Rapporto del Dipartimento di Difesa del Suolo dell’Università della Calabria.
No full textAttività di ricerca concernenti la valutazione dei tempi di down-time per il porto di Gioia Tauro
Discussion on paper titled: "Incipient motion of coarse particles on a slope by regular or irregular waves" by N. Erdem Unal and M. Bayazit, Journal of waterway, port, coastal and ocean engineering, vol. 124 n. 1, (1998).
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