Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"edge waves"”.
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Low Frequency Edge Waves and Their Role In Coastal Dynamics
<p>Low frequency edge waves with large spatial scales represent an important part of the coastal ocean response to tidal and atmospheric forcing. A semidiurnal tide traveling over the continental shelf and slope can be propagated by a Hybrid Kelvin-Edge Wave (HKEW), which is the fundamental mode …
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The Formation of Edge Waves Under Monochromatic and Random Incident Waves
Edge waves are coastal waves trapped near the shore by reflection and refraction. Previous studies show the excitation mechanism of edge waves under monochromatic wave conditions via phase locking and nonlinear growth. However, how efficiently the mechanism would work under random incident waves …
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Nonlinear resonance of trapped waves on a plane beach
Linear edge waves were first found mathematically by Stokes (1846). It has long been a topic of interest, since edge waves are believed to be responsible for the formation of beach cusps. Galvin (1965) was the first to observe in the laboratory that edge wave mode of frequency w can be excited by …
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Ultrasound field measurement and modelling for non-destructive testing
… of Non-destructive Testing (NDT) and ultrasonic waves can be generated and detected by means of numeric methods. This thesis focuses on piezoelectric transducers and Electromagnetic Acoustical Transducer (EMAT). For testing with piezoelectric transducer (also called a probe), couplant has to be …
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High-resolution ultrasonic non-destructive testing
… are interpreted in terms of the plane- and edge-wave model of *transducer fields. Improverents can be obtained by the use of non-uniformly excited transducers of two basic types: the first, the plane-wave-only (PWO) source; is more strongly excited at its centre than towards the rim, where …
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Analysis of seismo-acoustic emission from ice fracturing events during SIMI’94
… direct measurements of ice-borne seismo-acoustic waves generated by ice fracturing processes. A major reason for studying this phenomenon is that this acoustic emission is a significant contributor to Arctic ocean ambient noise. Also the Arctic contains rich mineral and oil resources and in order …
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Design sea levels for Southern Africa : a probabilistic approach
… continent are primarily affected by tide, shelf waves, wind waves and edge waves. These processes were found to be statistically independent of one another for the areas evaluated. Design sea level would appear to be determined by a combination of a number of moderate magnitude events rather than …
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On the propagation of free topographic Rossby waves near continental margins
… has demonstrated that free topographic Rossby waves propagate northward up the continental rise south of New England. To study the dynamical implications of these waves as they approach the shelf, Beardsley, Vermersch, and Brown conducted an experiment in 1976 (called NESS76) in which some …
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Effects of surfzone wave transformation on swash dynamics
… crest determined whether most of the incoming waves broke before reaching the shoreline. This forced a change in the pattern of wave energy dissipation across the surfzone between low and high tide, which was reflected by changes to swash elevation (runup) on time-scales of a few hours. …