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 20 of 69 for “"Shoaling"”.
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Kelvin waves in a shoaling shallow sea
We revisit Taylor's problem and discuss some model test problems both through Taylor's approach and other numerical methods such as a 'Finite approximation method' and 'Green's function technique'. The solutions generated by each method are compared for consistency. The objective lies in the fact …
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Variation in shoaling behavior in lake Mývatn threespine stickleback in relation to temperature and origin
… and geological features have an impact on the shoaling behavior of juvenile stickleback of lake Mývatn. Fish were reared at contrasting temperatures (22 °C and 13°C) for 5-7 months. Shoaling was tested by placing a single fish in an arena with a shoal and two distractors and behaviour recorded …
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The refraction, shoaling and structure of non-linear internal waves at a continental shelf margin
… tests of the model for the refraction and shoaling of interfacial solitary waves propagating in simple environments show agreement with analytical results. The model is then extended to simulate the refraction and transformation of the internal waves observed during SES, using realistic …
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Acoustic investigation of the shoaling dynamics of sardine sardinops sagax populations : implications for acoustic surveys
… pelagic environment. This study investigated the shoaling dynamics of sardine at various scales in both the horizontal and vertical dimension in an attempt to ascertain whether these surveys are adequate to characterise the occupation of space by sardine. Hydro-acoustic data collected during 5 …
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A Comparison of Spatial Interpolation Techniques for Determining Shoaling Rates of the Atlantic Ocean Channel
… Channel. These surfaces are used to produce shoaling amounts, which are taken in the form of volumes (yd.³). Because the Atlantic Ocean Channel is a large channel with a small gradual change in depth, a comparison of grid resolution was conducted to determine what difference, if any, exists …
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The Role of the Preoptic Area in Social Interaction in Zebrafish
… how these four nodes of the SDMN respond when shoaling and when exposed to different social cues. Combined visual and olfactory exposure to conspecifics significantly increased levels of the phosphorylated ribosome S6 protein (PS6) in the POA, however surprisingly there was no change in POA PS6 …
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An investigation of bottom changes in Monterey harbor (1932-1969).
… that the major portion of the harbor has been shoaling in the mean since 1932. The long-term shoaling rate has been 0.4 to 4.0 feet per decade in the beach and nearshore zones and along the breakwater; and less than 0.25 feet per decade in the stable outer harbor. The accretion rate averaged …
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Wave breaking onset and dissipation in a fully non-linear, staggered grid Boussinesq model
… the FNL model capable of accurately reproducing shoaling behavior and esti- mates of parameters needed to describe the onset of breaking? • 2. How can the description of breaking be improved in order to accurately reproduce CFD calculations? ☐ It is clear from prior results that linear, KdV or …
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The effect of attenuation from fish on long-range active and passive acoustic sensing in the ocean
… acoustic signals caused by diel or seasonal shoaling patterns of fish groups. Here, Ocean Acoustic Waveguide Remote Sensing (OAWRS) is used to instantaneously image massive Norwegian herring shoals that stretch for thousands of square kilometers and simultaneously measure attenuation from …
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Dynamics Of Internal Solitary Wave And Bottom Boundary Interaction
… of internal solitary waves (ISWs) of depression shoaling upon a uniformly sloping boundary in a smoothed two-layer density field was investigated using high-resolution two-dimensional simulations. The simulations were performed for a wide range of boundary slopes S∈[0.01,0.3] and wave slopes. …
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Ocean Acidification and Seasonal Temperatures Counter Positive Novel Species Interaction and Warming Effects on Tropicalising Temperate Fish Communities
… slow tropicalisation through degradation of the shoaling performance of novel tropical-temperate fish shoals (Chapter 2). In addition, I show that future winter conditions negatively affect tropical fish behavioural repertoire and physiological function in temperate ecosystems (Chapters 3 and 4). …
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The Effect of Attenuation from Fish on Long-Range Active and Passive Acoustic Sensing in the Ocean
… acoustic signals caused by diel or seasonal shoaling patterns of fish groups. Here, Ocean Acoustic Waveguide Remote Sensing (OAWRS) is used to instantaneously image massive Norwegian herring shoals that stretch for thousands of square kilometers and simultaneously measure attenuation from …
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Behaviour and morphology of the zebrafish, danio rerio
… roles in this species. Investigations into the shoaling behaviour of the zebrafish revealed no evidence for association preferences for familiar individuals or kin. The ubiquity of a preference for familiars in shoaling fish may have been over emphasized. This study did, however, find evidence …
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Visual perception of social groups in zebrafish
… and overall amount of motion - might influence shoaling behaviour and be integrated within a dorsal thalamic circuit for the detection of social cues. I show that visual motion cues alone are sufficient to elicit attraction and a preference for larger groups, and that behavioural choices are …
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The influence of topography on steady currents and internal waves
… to the island concerns the nonlinear effects of shoaling internal gravity waves. For normal incidence on a two-dimensional beach the Reynolds stresses produced by the fundamental wave motion are shown to force a mean Eulerian current which is equal hut opposite in sense to the Stokes drift. This …
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Depositional and Diagenetic History of the Middle Ordovician Carbonates of the Shenandoah Valley, Northern Virginia
… carbonate deposition to reach sea-level. These shoaling events suggest a slowly subsiding basin in this region. The carbonate rocks within the study area have been compared to the sediments of the modern Andros Island, Bahamas to establish a depositional and diagenetic model. The models proposed …
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Exploring the Behaviour and Physiology of Juvenile Bonefish (Albula vulpes): Fundamental and Applied Perspectives
… 2, I experimentally assessed juvenile bonefish shoaling preference when given the opportunity to shoal with conspecifics and other nearshore juvenile fish. In Chapter 3, I analyzed the consequences of light pollution on the behaviour and physiology of juvenile bonefish. This research generated …
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North-south variations in structure, topography, and melting regime along the ultra-slow spreading Red Sea Ridge
… m). South of 19.75°N, plume-supported axial shoaling matches that of adjacent parts of Arabia, Africa, and the Gulf of Aden. Geochemically, the southernmost Red Sea is the locus of plume-ridge interaction. Here, E-MORBs are enriched in alkali, incompatible, and light rare-earth elements.
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Wave-, wind-, and tide-driven circulation at a well-mixed ocean inlet
… owing to breaking-induced onshore momentum flux. Shoaling and breaking of large waves cause depression (setdown, offshore of the ebb shoal) and super-elevation (setup, on the shoal and in the inlet) of the mean water levels, resulting in changes to the cross-shoal pressure gradient, which can …
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