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 245 for “"Bathymetry"”.
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Deriving bathymetry from multispectral and hyperspectral imagery
… for planning military amphibious operations. Bathymetry from remote sensing with multispectral or hyperspectral imagery provides an opportunity to acquire water depth data faster than traditional hydrographic survey methods without the need to deploy a hydrographic survey vessel. It also …
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Bathymetry of the South African Continental Shelf
… knowledge of the seafloor features, or bathymetry, of the continental shelf is essential to understanding both its long-term geological evolution and present-day use for resources and navigation. Unfortunately there has been little advancement in our knowledge of the South African …
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Automated bathymetry mapping using an autonomous surface craft
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1996.
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Lower Charles River bathymetry : 108 years of fresh water
The Lower Charles River has been a heavily utilized urban river that runs between Cambridge and Boston in Massachusetts. The recreational usage of the river is dependent on adequate water depths and there have been no definitive prior studies on the sedimentation rate of the Lower Charles River. …
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Generation of high quality 2D meshes for given bathymetry
… criteria that depend on local properties of the bathymetry and relevant dynamical scales. Two different smoothing techniques, Laplacian conditioning and targeted averaging, were applied to the fields involved in calculating the sizing matrix. The L² norm was used to quantify which technique had …
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The effect of stratification and bathymetry on internal seiche dynamics
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2000.
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Nearshore Bathymetry from Fusion of ICESat-2 and Multispectral Satellite Imagery
… for accurate and frequently updated nearshore bathymetry data sets. Airborne lidar bathymetry (ALB) is the most accurate way to survey large areas with high accuracy, although these data collections are limited by their high cost and by turbidity in some places. High resolution multispectral …
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Automated Filtering and Attribution of Archive Bathymetry Based on A Priori Knowledge
<p>Hydrographic offices hold large volumes of historical bathymetric data. Many of these valuable datasets were collected using older generation survey systems and contain little or no metadata. Current efforts to utilize these data require human intervention to remove outliers and assess quality. …
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Improving the Capabilities of Swath Bathymetry Sidescan Using Transmit Beamforming and Pulse Coding
Swath bathymetry sidescan (SBS) sonar and the angle-of-arrival processing that underlies these systems has the capability to produce much higher resolution three dimensional imagery and bathymetry than traditional beamformed approaches. However, the performance of these high resolution systems is …
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Subduction dynamics at the middle America trench : new constraints from swath bathymetry, multichannel seismic data, and 10BE
The cosmogenic radionuclide 10Be is a unique tracer of shallow sediment subduction in volcanic arcs. The range in 10Be enrichment in the Central American Volcanic Arc between Guatemala and Costa Rica is not controlled by variations in 10Be concentrations in subducting sediment seaward of the Middle …
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Multibeam echosounding as a tool for mapping geologic features, bathymetry and modern vents, Yellowstone National Park, Wyoming
Yellowstone National Park (YNP) is a unique area for study due to the broad range of geologic and geomorphic agents that have sculpted this terrain over time. This research employed a multibeam echosounder (MBES) in Lewis Lake and Yellowstone Lake, in August 2011, to describe and interpret the …
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Subduction dynamics at the middle America trench : new constraints from swath bathymetry, multichannel seismic data, and ¹⁰Be
The cosmogenic radionuclide ¹⁰Be is a unique tracer of shallow sediment subduction in volcanic arcs. The range in ¹⁰Be enrichment in the Central American Volcanic Arc between Guatemala and Costa Rica is not controlled by variations in ¹⁰Be concentrations in subducting sediment seaward of the Middle …
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Sensitivity of the Estuarine-shelf Exchange in Mississippi Coastal Waters to River Diversions and Linkage Pathway Bathymetry: A Modeling Study
<p>The exchange flow between the Mississippi (MS) Sound and Bight is an intricate circulation pattern that affects many important regional processes, including flushing time, sediment transport, and larval dispersion. This study examines the exchange flow in the MS Sound by estimating the volume …
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Lateral variation in upper mantle temperature and composition beneath mid-ocean ridges inferred from shear-wave propagation, geoid, and bathymetry
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1991.
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Modeling sandbar effects on nearshore waves and morphological change using SWAN
… the impact of small alongshore variations in the bathymetry of an outer sandbar (in about 5-m water depth) on the nearshore wave field as the shallow (< 3 m) bathymetry changes from near alongshore uniform to strongly spatially variable to understand wave driven morphologic evolution. Waves were …
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Modeling Sandbar Effects on Nearshore Waves and Morphological Change using SWAN
… the impact of small alongshore variations in the bathymetry of an outer sandbar (in about 5-m water depth) on the nearshore wave field as the shallow (< 3 m) bathymetry changes from near alongshore uniform to strongly spatially variable to understand wave driven morphologic evolution. Waves were …
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Detecting Breaking Waves and Measuring Bore Speeds in Optical Surf Zone Imagery using Machine Learning
… compared with theoretical models using surveyed bathymetry. Bathymetry inversion from the derived bore speeds is then explored, revealing low but systematic bias within the surf zone. Despite this limitation, a qualitative analysis of the inverted bathymetry demonstrates that the method captures …
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Hydrodynamic and morphodynamic responses to surfzone seafloor perturbations
… in wave breaking caused by the perturbed bathymetry resulted in strong rip currents in the channels under some conditions, whereas alongshore currents bypassed the channels under other conditions. The dynamics of the circulation response for changing wave forcing, bathymetry, and tidal …
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Hydrodynamic and morphodynamic responses to surfzone seafloor perturbations
… in wave breaking caused by the perturbed bathymetry resulted in strong rip currents in the channels under some conditions, whereas alongshore currents bypassed the channels under other conditions. The dynamics of the circulation response for changing wave forcing, bathymetry, and tidal …
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