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.
Results
Showing 1 to 20 of 181 for “"Seabed"”.
-
Water waves over a muddy seabed
A generalized viscoelastic model is used to describe the rheological properties of mud and is fitted to the available experimental data, so that its constitutive coefficients are just material properties independent of the frequency of the external forcing. We integrate this model into a …
-
Pipe-Soil Interaction on a Clay Seabed
… are typically installed directly onto the seabed and, in the absence of significant drivers to undertake burial operations, they may remain on the seabed for the remainder of their design life. This is typically the case for deepwater developments. Subsea pipelines are subjected to a wide …
-
Spatial distribution and conservation planning of seabed biological diversity
Knowledge of spatial patterns of biota has become a commodity for conservation practitioners and spatial ecologists alike. This type of information enables the identification of representative and unique biological features (at some nominal scale) which itself constitutes the application par …
-
Assessing Dynamic Seabed Change on the Scottish Continental Shelf
… planning of offshore installations in macrotidal seabed environments that are already highly modified by non-stationary non-tidal hydrodynamic drivers (e.g., surface waves). Changes to the non-tidal drivers due to future climate change will likely have a site-specific effect on the dune mechanics, …
-
Machine learning methods for discriminating natural targets in seabed imagery
… discriminating qualitative natural targets in seabed imagery. The applications considered, typically involve time-consuming manual processing stages in an industrial setting. An aim of the research is to facilitate a means of assisting human analysts by expediting the tedious interpretative …
-
Long waves in water over a visco-elastic muddy seabed
… propagation of surface waves over a flat muddy seabed are studied. Mud is first considered as a Newtonian fluid. Water and mud equations are derived in order to obtain governing equation for surface and interface waves. By the method of multiple scales. nonlinear evolution equations are derived …
-
Dynamics of Saturated Porous Media: Wave Induced Response and Instability of Seabed
… porous media, and wave-induced response of seabed in free field and around a breakwater under pulsating/breaking waves. For each formulation, the results are presented with pore-pressure, shear and normal stress distributions within porous medium. The response is studied for various …
-
Characterization of Natural and Anthropogenic Seabed Features in the Southwestern Baltic Sea
… from human activities that can disturb the seabed and may threaten the proper functioning of marine ecosystems. A sustainable balance between human uses and seabed integrity requires knowledge of the seabed's physical characteristics, benthic habitat distribution, and the extent of human …
-
Acoustic data optimisation for seabed mapping with visual and computational data mining
… will examine the complexity of the de facto seabed mapping technique by exploring and analysing acoustic data with a combination of data mining and visual analytic methods. First we test the redundancy issues in multibeam echosounder (MBES) data by using the component plane visualisation of a …
-
The law of the sea: the United States, Canada and the deep seabed
The Falkland Islands War of 1982 was fought over competing claims to sovereignty over a group of islands off the east coast of South America. The dispute was between Argentina and the United Kingdom. Argentina claims the islands under rights to Spanish succession, the fact that they lie off the …
-
Detection, classification and localization of seabed objects with a virtual time reversal mirror
… detection, classification and localization of seabed objects in shallow water environments using a time reversal approach in a bistatic configuration. The waveguide is insonified at low frequency ('kHz) with an omnidirectional source and the resulting scattered field is sampled by a receiving …
-
Acoustic Seabed and Target Classification using Fractional Fourier Transform and Time-Frequency Transform Techniques
An approach for processing sonar signals with the ultimate goal of ocean bottom sediment classification and underwater buried target classification is presented in this dissertation. Work reported for sediment classification is based on sonar data collected by one of the AN/AQS-20's sonars. …
-
Numerical and Analytical Analysis of Vortex Induced Vibrations of a Pipeline Close to Seabed
… vortex induced vibrations of a pipeline close to seabed is investigated in this dissertation numerically. Firstly, a novel wake oscillator model is extended from the classic Van der Pol equation by introducing an additional nonlinear term and two empirical coefficients to account explicitly for …
-
Detrainment and Settling of Sediment in Turbidity Currents: A Study to Inform Deep Seabed Mining
… body of the deep-ocean, the International Seabed Authority (ISA), has simultaneously been attempting to protect the deep-sea from ruin by potentially harmful practices while also seeking to approve mining practices for mineral extraction from the deep-ocean for several years. Understanding …
-
An in situ Investigation of Sediment Hydrodynamics for Advancing Seabed Mining Plume Monitoring and Modeling
The potential of seabed mining for mineral resources, vital in transitioning to a metals-based economy, is rapidly gaining momentum and is poised to materialize within the next decade. A pivotal step in this process requires establishing seabed exploitation regulations that call for a proactive …
Page 1 of 10