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 20 for “"Wave dissipation"”.
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Ambient noise and surface wave dissipation in the ocean
… consensus that the sound generated by breaking waves is responsible for much of the ambient noise level in the ocean. While numerous field measurements have shown a strong correlation between the ambient noise spectrum level (N) in the range 100Hz to 25kHz and wind speed in the ocean, very …
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Ambient noise and surface wave dissipation in the ocean
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1993.
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Wave propagation in flexible tubes
Wave dissipation was previously investigated intensively in the frequency domain, in which the dissipation of waves is described as attenuation of pressure pulse decay with respect to the frequency or harmonics. In this thesis, wave dissipation, including decay of pressure pulse, peak of wave …
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Gravity Wave Characteristics in the Troposphere, Lower Stratosphere, and Mesopause at the South Pole
… to examine the characteristics of gravity waves at the South Pole. Studies examine the troposphere, lower-stratosphere, and mesopause. It is found that wave strength in the lower atmosphere is always less energetic than at low- and midlatitude sites. In austral winter, wave amplitudes are …
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Exploring connections between seagrass ecosystem services and meadow hydrodynamics
… includes quiescent habitat for other species, wave damping, water quality enhancement, and carbon sequestration. This thesis reports on a series of studies using physical experiments, simulations, and field measurements to relate the interactions between seagrass, waves, currents, and sediment …
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Seafloor ripples created by waves from Hurricane Ivan on the west Florida shelf
… ripples created by Ivan. Average relict ripple wavelengths left after the storm were found to increase with water depth (50 cm, 62 cm, and 83 cm in 20, 30, and 50 meter water depths) despite the fact that orbital diameter decreases with water depth. Ripple prediction requires information about …
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Seafloor ripples created by waves from hurricane Ivan on the west Florida shelf
… ripples created by Ivan. Average relict ripple wavelengths left after the storm were found to increase with water depth (50 cm, 62 cm, and 83 cm in 20, 30, and 50 meter water depths) despite the fact that orbital diameter decreases with water depth. Ripple prediction requires information about …
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Effects of Posidonia oceanica seagrass on nearshore waves and wave-induced flows.
… seagrass Posidonia oceanica on coastal waves and wave-induced flows, which has significant implications for coastal protection. Investigations were made on both a natural shallow Posidonia oceanica bed and, in controlled conditions of full-scale Posidonia mimics under regular and …
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Environmental requirements for optimal naval operational efficiency
… past and current ocean modelling (specifically wave modelling), the third generation SWAN (Simulating WAves Nearshore) model is selected to model a small component of the military oceanographic spectrum viz. waves. The selected area, includes an area where the US Navy conducted an amphibious …
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Effects of surfzone wave transformation on swash dynamics
… at improving the understanding of the effects of wave breaking, beach slope, and nonlinear wave interactions on the swash oscillations. These problems were addressed by analysing datasets obtained from field experiments undertaken at these two sites. A field experiment at Tairua Beach showed that …
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Is the Indian Ocean MOC driven by internal wave breaking?
… the interaction between a broad band internal wave field and a mean flow using idealized numerical simulations (Part II). The main objective of this work is to quantify how much energy is needed to drive the Indian Ocean MOC and to compare this with the energy available in the internal wave …
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Computational Analysis of Internal Coral Hydrodynamics
… of nutrient uptake, mass transport, wave dissipation, and other essential processes. These physiological processes depend on the local velocity field, local concentration gradients of nutrients and waste, and the turbulent stresses developed on and above the coral surface. Though the …
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Resonant wave-ion interactions in the heliosphere: I. Interplanetary traveling shocks, II. Ion heating and acceleration in the extended corona
… and associated generation of hydromagnetic waves at a planar stationary shock. Coupled wave kinetic and energetic particle transport equations are solved numerically and compared with an analytical approximation similar to that derived by Lee [1982, 1983]. The analytical approximation …
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Inlet swirl distortion effects on the generation and propagation of fan rotor shock noise
… The Euler calculations reduce numerical wave dissipation and enable the simultaneous computation of source noise generation and propagation through the engine inlet to the far-field in non-uniform flow. The generated shock Mach numbers are in good agreement with experimental results, with …
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Mode conversion and wave -particle interaction processes in the solar wind
<p>This thesis presents the theoretical study of wave coupling and wave-particle interaction processes in the solar corona and wind. We first investigate the effect of an inhomogeneous velocity field on the propagation of waves in the solar atmosphere. We find that coupling between Alfven waves and …
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The refraction, shoaling and structure of non-linear internal waves at a continental shelf margin
Observations of internal waves near the Continental shelf-edge are generally ascribed to generation by oscillating tidal flow over the local bathymetry, in the presence of a stratified water column, giving rise to the internal tide. In this thesis observations are presented which demonstrate that …
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Acoustic-Gravity Wave Propagation Based on Solutions to the Generalized Multi-component Transport Equations
… have provided important insight into acoustic waves generated by natural and man-made hazards, which may steepen into shocks or N-waves while also dissipating when propagating in the thermosphere. Although models have yielded results that agree with observations of ionospheric perturbations, …
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Studies of wave-mean interaction relevant to the middle atmospheric circulation
… part (Chapters 2 and 3) we demonstrate how the wave-induced mean motion can be described in terms of the dynamics of Rossby-Ertel potential vorticity (PV). In the second part (Chapters 4 and 5), Rossby waves and their mean effects in the middle atmosphere are investigated within the framework of …
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Gravity Wave and Turbulence Transport in the Mesopause Region
<p>Vertical transport due to dissipating gravity waves and turbulence in the mesopause region (85-100 km) are analyzed with observational data obtained from a narrow-band sodium wind/temperature lidar located at Andes Lidar Observatory (ALO), Cerro Pach´on (30.25 S, 70.73 W), Chile. The Na lidar at …
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Morphodynamics of Ebb-Tidal Deltas
… explore the interactions between tidal currents, waves, and morphology, and to test the sensitivity of morphological development and response to changes in forcing conditions. A detailed video-based observational record was used to identify and track geomorphic features over 5 years at an …