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 44 for “"surf zone"”.
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Surf zone hydrodynamics
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2001.
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The field measurement of suspended sediment in the surf zone
Suspended sediment concentrations were measured in the nearshore environment at the site of the proposed breakwater of the Koeberg Nuclear Power Station. Reference concentrations are evaluated from the field data. Two sampling systems to obtain these concentrations were designed and constructed. …
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Analysis of acoustic communication channel characterization data in the surf zone
A channel characterization experiment for the underwater acoustic communication channel was carried out at Scripps Pier in May 1999. The experiment investigated acoustic transmission in very shallow water and breaking waves. In analyzing the data, several questions arose. The majority of the …
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Analysis of acoustic communication channel characterization data in the surf zone
Thesis (S.M. in Electrical Engineering)--Joint Program in Oceanography and Oceanographic Engineering (Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science; and the Woods Hole Oceanographic Institution), 2000.
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Design of a prototype autonomous amphibious WHEGS robot for surf-zone operations
… robots ability to maneuver effectively in the surf-zone.
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The effect of fluid acceleration on sediment transport in the surf zone
The surf zone is defined by highly non-linear, breaking waves that have very different acceleration signatures beneath their respective crests and troughs. The consequences of this dissimilarity on sediment transport is not fully understood. This thesis develops methodologies to predict sediment …
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A Capacitance Wavestaff and Measurements of Wave Height Decay in the Surf Zone
… was developed to measure wave heights in the surf zone. Data were used to test the assumption that wave height decays linearly across the surf zone. The instrument system consisted of two wavestaffs and housing which contained the needed electronic circuits and a data recorder. Acceptable …
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Waves, currents, and sediment transport in the surf zone along long, straight beaches
… near-shore hydrodynamics model consists of wave, surface roller, and near- shore current models. Both wave and surface roller models are based on simple energy balance equations and, based on these models, the near-shore current is determined from two-layer 2DH momentum equations. Coupled with a …
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Wave boundary layer hydrodynamics and cross-shore sediment transport in the surf zone
… mostly occur in the nearshore region, or surf zone. They are caused by the local imbalance of sediment transport, both in long-and cross-shore directions. Cross-shore sediment transport is the small difference between two large components: the on- and offshore transport rates. Both …
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Development and application of a field instrumentation system for the investigation of surf zone hydrodynamics
… steady flow conditions. The wave gauges are surface-piercing digital sensors, relying on the presence or absence of water at 128 individual sensing electrodes spaced 1.5 cm apart along the front surface of the wave gauge. On command, the instantaneous water surface elevation is measured, then …
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Characterization of robotic tail orientation as a function of platform position for surf-zone robots
The Naval Postgraduate School Small Robot Initiative is an ongoing effort to develop autonomous robotic platforms for military applications. The latest design in this series, a quadruped robot with a tail for stability and obstacle climbing, is currently under development in collaboration with Case …
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Detecting Breaking Waves and Measuring Bore Speeds in Optical Surf Zone Imagery using Machine Learning
… revealing low but systematic bias within the surf zone. Despite this limitation, a qualitative analysis of the inverted bathymetry demonstrates that the method captures morphological change over the course of the experiment. This method shows promise as a robust, low-cost approach for …
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Dynamics and utilization of surf zone habitats by fish in the South-Western Cape, South Africa
… size structure of fish assemblages frequenting surf-zone habitats in the south-western Cape, South Africa, to investigate temporal and spatial variations in these assemblages in relation to physical environmental parameters, and to assess the importance of this habitat as a nursery and feeding …
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The importance of beachgoers as a source of beach litter
… litter is a major source of litter in the surf zone. I compared the composition of litter in the surf zone to that on the sandy beach over 50-days in 2022/23, repeating a previous study performed in 2013/14. Daily net tows in the surf zone revealed that litter abundance had decreased since …
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Invertebrate plankton assemblages in the surf zones of St. Lucia and Mhlathuze Estuaries, KwaZulu-Natal, South Africa
This study described the surf zone invertebrate plankton assemblages of the exposed sandy beaches adjacent to the St Lucia and the Mhlathuze estuaries. The broad aims of this study were to identify the invertebrate plankton assemblages, to describe these in terms of species composition, abundance …
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3-D Modeling of Nearshore Circulation Using ROMS-SWAN: Model Upgrades and Evaluation
… REF/DIF). The coupled model has been applied to surf zone applications like oblique incidence of waves on a planar beach, rip current formation in alongshore bar trough morphology (e.g., Haas and Warner, 2009). In this thesis, I present an updated version of the coupled model which implements a …
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Detached macrophyte accumulations in surf zones: Significance of macrophyte type and volume in supporting secondary production
… areas and accumulate in large volumes in surf zones, where they are commonly called wrack. In coastal regions in other parts of the world, wrack transported from one habitat to a second habitat can be considered as a "spatial subsidy" for the recipient habitat with significant consequences …
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The influence of environmental variables on white shark (carcharodon carcharias) sightings at False Bay beaches.
… white sharks (Carcharodon carcharias) in the surf zone was implemented in 2004 in Cape Town, South Africa.
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Hydrodynamic and morphodynamic responses to surfzone seafloor perturbations
Holes and channels were excavated in the surf zone on an ocean beach near Duck, NC, and observations of the subsequent evolution of waves, currents, and the modified seafloor were used to investigate nearshore dynamics. In one set of seafloor perturbation experiments, deep holes with steeply …
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