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 15 of 15 for “"Tidal channels"”.
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Modelling the morphodynamics of tidal channels
… of both convergent and non-convergent tidal channels have been studied. The analysis has been made using a second order numerical scheme, solving the 1D flow equations and the continuity equation for the bed evolution in order to point out the main characteristics of the phenomenon. …
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Hydrodynamics and morphodynamics of shallow tidal channels and intertidal flats
… which control morphodynamics of shallow tidal embayments are investigated analytically. In the process of exploring these mechanisms (specifically asymmetries in bottom stress, τ), basis momentum and mass balances which govern flow in these systems are clarified. Temporal asymmetries in τ …
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Hydrodynamics and morphodynamics of shallow tidal channels and intertidal flats
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1993.
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Response of barrier island fish assemblages to impacts from multiple hurricanes: assessing resilience of Chandeleur Island fish assemblages to hurricanes Ivan (2004) and Katrina (2005)
… and the possible influence that storm-generated tidal channels may have on the composition of local fish assemblages. I also compared recently collected data to historic ichthyofaunal survey data collected over thirty years ago at the Chandeleur Islands. Near shore fish assemblages changed the …
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Depositional History and Petroleum Potential of the Middle Devonian Fort Vermilion Formation, Alberta
… drawdown through a seaward barrier or tidal channels. Relative sea level rise resulted in a better connection with the open ocean and the end of evaporite deposition, though salinity-restricted conditions persisted, as demonstrated by a paucity of marine biota. Following further sea …
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Marine offshore to alluvial plain transitions within the "Chemung"-Hampshire interval (Upper Devonian) of the southern central Appalachians
… shoal water delta facies or into low-energy subtidal to supratidal mudflat facies. The absence of beaches and tidal channels is indicative not only of low tidal ranges, but also of seaward dissipation of wave-energy within a very shallow intracratonic foreland basin. The easternmost sections of …
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Hypsometric and geometric controls on hydrodynamics, tidal asymmetry, and sediment connectivity in shallow estuarine systems
Estuaries and tidal basins are highly dynamic coastal systems that serve as a transition zone between the river and the ocean. The morphological evolution of these diverse environments is modulated by non-linear feedbacks between tides, meteorological forcing, and sediment transport processes. This …
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Bio-physical controls on tidal network geomorphology
Looking over a tidal wetland, the tidal network characterised by its intricate system of bifurcating, blind-ended tidal courses clearly stands out from the overall landscape. This tidal landform exerts a fundamental control on the morphology and ecology within the tidal environment. With today’s …
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Persistence of Depositional Features in a Strongly Seasonal, Tide-Dominated Delta
… we examine the idea that sediment stored in the tidal channels throughout the year is being resuspended and delivered to the mangrove platform during the dry season when sediment input to the system is at a minimum. Over two field seasons 70 shallow (cm) sediment cores were collected from the …
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Depositional characterization of the Eau Claire Formation at the Illinois Basin - Decatur Project: facies, mineralogy and geochemistry
… four major depositional facies exist within a tidally influenced, shallow marine depositional environment. These include (Unit A) intertidal mixed sand/mud flats and tidal channels of the foreshore environment; (Unit B) subtidal deposits of the offshore transition zone; (Unit C) subtidal …
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New approach to tidal stream energy analysis at sites in the English Channel
Tidal stream power generation offers the prospect of predictable, low-CO2<br/>power at a number of locations around the UK and the world. Previous<br/>assessments of tidal energy resources have taken the form of desk studies<br/>based on simplified navigational data. Where numerical model data has …
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Sedimentology of the Mid-Visean limestones of the southern part of the Askrigg Block, North Yorkshire
… throughout deposition of nearshore shallow subtidal calcarenltes of the formation.<br/><br/>The Douk Gill Formation, restricted in outcrop to a local topographic hollow in Ribblesdale, is probably a lateral equivalent of the Thornton Force Formation. A ridge of Lower Palaeozoic rocks provided a …
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Structure and development of oyster reefs on the Suwannee River delta, Florida
… ebb and flood tides. The reefs are dissected by tidal channels and have a maximum relief of 3 m. No evidence of any buried reef structures dating back to the Pleistocene was found on the delta platform.</p> <p>The three oyster reefs are composed of approximately 70 percent by volume shells and …
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Long-term morphological response of tide dominated estuaries
… of the world are influenced by tides. The tidal action is a fundamental mechanism for mixing river and estuarine waters, resuspending and transporting sediments and creating bedforms. The planform of tide-dominated estuaries is characterized by a funnel-shaped geometry with a high …
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The Hydrodynamic and Estuarine Physics Of Maketu Estuary
… showed the estuary to consist of large inter-tidal areas covering 70-80% of its -2 km² area. A bathymetry map of the estuary was produced showing that Maketu is a small geomorphologicaly "perched" and "low meso-tidal" estuarine lagoon dissected by numerous narrow tidal channels, 10-30 m wide …