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 52 for “"tidal flat"”.
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Bioreactor Janssand : fermentation processes in tidal-flat sediments of the German North Sea
Der anaerobe Abbau organischen Materials in Wattsedimenten umfasst mehrere Schritte. Der Fokus dieser Studie liegt auf den einleitenden Fermentationsprozessen. Im Rahmen dieser Arbeit wurde ein neuer experimenteller Ansatz entwickelt, bei dem Mikrokalorimetrie zur Ermittlung verschiedener …
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Community, structure, activity and ecophysiology of sulfate-reducing bacteria in deep tidal flat sediments
… active in down to 5 meters depth of a tidal sand flat (German Wadden Sea). The majority of the isolated and quantified SRB were members of two widely distributed phylogenetic groups within the Deltaproteobacteria. Many cultured representatives as well as the isolates from this study are …
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Methane and nutrient dynamics in a tidal flat area of the Southern North Sea: time-series and budgets
… 10 minütlich; Nährstoffe: stündlich) brachte ein tidales Konzentrationsmuster mit höheren Werten bei Niedrigwasser hervor, was auf eine Quelle in den Rückseitenwatten hinweist. Porenwasseruntersuchungen bis zu einer Sedimenttiefe von 4,5 m wiesen die Sedimente als einen Ort erhöhter …
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Nematofauna da planície de maré de Coroa Grande, Baía de Sepetiba, RJ
… of marine nematodes on the Coroa Grande tidal flat, Sepetiba bay, Rio de Janeiro. Brazil (22º55'00"S e 43º05' 30''W). Monthly samples were taken during Iow tides, using a corer with 1cm², from may-98 to april-99. Samples were obtained within transect strata which represent the different …
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Pore water biogeochemistry and trace metal dynamics in deep intertidal flat sediments
… profiles of margins compared to central parts of tidal flats as well as of sand and mixed flats. The deep pore water studies illustrate that seasonal variations of sulphate, DOC, and nutrients are not limited to the sediment surface. Seasonal variations of Mn, Fe, Mo, and U are by contrast limited …
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Intertidal mudflats and the conservation of migratory shorebirds
Migratory shorebirds rely on intertidal habitats that are increasingly threatened by habitat loss, human disturbance, and climate change. Investigating habitat availability, its influence on shorebird populations and how to prioritise conservation efforts is critical to inform conservation …
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Regional dolomitization of Early Ordovician, Upper Knox Group, Appalachians
… fluctuations and typically have well developed tidal flat caps. Cycles are bundled into five transgressive-regressive sequences which correspond to third order (1-10 m.y.) sea-level fluctuations defined by Fischer plots. The Upper Knox Group is 90% dolomite of which greater than 75% predates …
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Depositional environments and diagenesis, Winnipegosis Formation (Middle Devonian), Williston Basin, North Dakota
… basin, deep shelf, shallow shelf, reef, lagoon, tidal flat, and evaporite basin. The deposition of the Winnipegosis and Prairie Formations were inter-related and occurred during six episodes. Following a brief hiatus separating the underlying Ashern Formation from the Winnipegosis, a clear, …
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The Quaternary geological evolution of the Belgian Continental Shelf, southern North Sea
… the Ostend Valley. The three units, separated by tidal ravinement surfaces, represent successive phases of a transgressive estuarine infilling during the Eemian sea-level rise. After the final phase, shoreface erosion was that severe, that seismic unit U3 was completely levelled with the …
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A stratigraphical, sedimentologial and palaeoenvironmental analysis of holocene and present-day coastal sedimentation: Wigtown Bay, S.W. Scotland
… B.P., leading to the deposition of low to high tidal-flats. By 6,480107 years B.P. local regression had begun and seaward progradation of high upper tidal-flats and marsh had started. This environmental situation prevailed until 5,000 years B.P., when incision occurred and terrestrial conditions …
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Petroleum potential of the Tilston interval (Mississippian) of central North Dakota
… The interval consists of four major facies (subtidal, shoal, tidal flat and supratidal anhydrite), and two geographically restricted facies (lagoonal and elastic) and represents a regressive sequence. </p><p> Tilston deposition began with the subtidal facies, deposited on a broad, shallow shelf. …
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Microphytobenthos (MPB) biomass variability and sediment- water column exchanges on an intertidal flat: Influence of weather-related abiotic factors across neap-spring-neap tidal cycles
… was investigated on transects across Fingringhoe Tidal Flat in Colne estuary, on three zones: the mud flat, the transition zone and the salt marsh. The results of this thesis suggest that MPB distribution on intertidal flat was controlled by a set of complex interaction between the MPB with both …
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A multidisciplinary approach to reservoir characterization of the coastal Entrada erg-margin gas play, Utah
… sandstone bodies that transition into a muddy tidal flat facies. These high quality reservoirs are dominated by eolian-influenced facies interbedded with sandy interdune facies. They are sealed vertically by muddy and silty facies of associated tidal flat deposits that act as excellent …
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Surface characterisation with nonlinear methods based on scale analysis
… microscopy image of a cross section through a tidal flat sediment. Both surfaces are created by a complicated interplay of processes for which no closed mathematical model is available. The processes are acting on different time and spatial scales. We make use of this property and use a …
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Tracking Electrons Through Element Cycles: Linking Fe, C, and O Cycles Through Shared Reactive Oxygen Species
… created by the permeable sediments in marsh and tidal flat systems. Field work was conducted on coastal groundwater collected at the Baruch Institute and Spiekeroog Island, Germany. Peroxide analysis was complicated by interference from high levels of background Fe(II).</p>
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Treadwell Memorial
… footings that achieve stability in the loose tidal flat sand. Its building assembly is a result of model studies to understand the connections between the central wall, roof, and floor. This is the end result of a desire to build a meaningful place in Alaska.
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Geochemical tracers in the deep-sea and the North Sea
… leading to a loss of fine fraction in recent tidal flat sediments. Today, heavy metal rich clay particles are only to a small extent deposited in the Wadden Sea area. The remaining permeable, anoxic sediments cause a high redox activity that is mainly indicated by an intense exchange of Mn and …
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Milankovitch-driven cyclicity and climate controlled dolomitization of a Late Triassic carbonate platform, Hungary
… thick. The platform is a cyclic succession of subtidal carbonate, laminated tidal flat limestone or dolomitic caps, and reddish or greenish paleosols or reworked paleosols. The Triassic was a time of global greenhouse conditions and Milankovitch climate forcing has been well documented from lakes …
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Hazard Identification and Coastal Stratigraphy in Crescent Harbor, Northeast Whidbey Island, Washington
… reveal a marsh peat abruptly overlain by intertidal mud, indicating rapid subsidence. Analysis of the modern-day position of depositional facies indicates subsidence from a high marsh to a tidal-flat environment representing an estimated 1.7 m elevation change. The timing of subsidence fits …
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Depositional environments and diagenesis of the Ratcliffe interval, Madison group (Mississippian), Williston Basin, North Dakota
… occurred around the basin margin. Sabkha tidal flat areas were present. Highly saline conditions at the end of the Ratcliffe allowed deposition of large amounts of halite.</p> <p>The facies in the studied cores showed that much diagenesis has occurred in the Ratcliffe interval. The most …
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