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 38 for “"Tidal flats"”.
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Stratification on the Skagit Bay tidal flats
… low-sloped, periodically inundated Skagit Bay tidal flats. Advection of stratification by the depth-averaged velocity, straining of the horizontal density gradient by velocity shear, and turbulent mixing are shown to be the dominant processes. On the south-central flats (near the south fork …
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Stratification on the Skagit Bay tidal flats
… low-sloped, periodically inundated Skagit Bay tidal flats. Advection of stratification by the depth-averaged velocity, straining of the horizontal density gradient by velocity shear, and turbulent mixing are shown to be the dominant processes. On the south-central flats (near the south fork …
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Evolution of early Proterozoic passive-margin carbonate platform, Rocknest Formation, Wopmay Orogen, N.W.T., Canada
… and siliciclastics, that grade up into intertidal stromatolitic dolomites; cyclic facies pass eastward into non—cyclic siliclastics of central and eastern "lagoon". The shelf was terminally drovmed during attempted subduction of the margin. Individual cycles are correlatable for over 200 km …
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Do microbial or biochemical settlement cues on the sediment surface mediate larval settlement of Polydora cornuta and Streblospio benedicti (Polychaeta, Spionidae)?
… larval development were found in sediments of tidal flats in the German Wadden Sea. These patterns were not explicable through grain size or other sediment parameters. This led to the hypotheses that active site selection and initial settlement of larvae were triggered by sediment associated …
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Bastions of turf : frisians, terpen and the re-adoption of a "working" landscape
… ancient inhabitants of the windswept flood prone tidal flats of northern Netherlands. These mounds are an optimal cultural adaptation to this region's harsh wet environment. During the great demographic decline of the "Dark Ages" the terpen were largely abandoned by their builders. New migrants, …
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Organisch-geochemische Untersuchungen der Oberflächengewässer aus dem Einzugsgebiet der Sielacht Esens (Ostfriesland)
… the annual DOC export into the backbarrier tidal flats of Spiekeroog island was estimated.
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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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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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Taphonomy of Sediments: Bioturbation in the Triassic Moenkopi Formation in Southwestern Utah
… mostly in large ancient river channels, tidal flats, delta and shallow marine environments. Five stratigraphic sections measured in the Virgin Limestone Member provided the basis for this study. Detailed descriptions and quantification of bioturbation were recorded in each of the …
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Distribution of Foraminifera and Pollen in Coastal Depositional Environments of the Southern Delmarva Peninsula, Virginia, U.S.A.
… of species diversity and equitability than the tidal flats and the channels-inlets-shoreface. Stepwise regression analyses indicate correlation of the five most frequently occurring species in living populations (>30% of the total stations) and the seven most frequently occurring species in …
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Natural and anthropogenic influences on recent sediment characteristics in the Knysna Estuary, South Africa and Yangtze River Estuary, China
Estuaries and tidal wetlands situated at the nexus of fluvial, marine and terrestrial conditions is highly dynamic and complex system. Despite strong hydrodynamics, estuarine tidal flats are preferential sites for the accumulation of fine-grained sediment, organic matter and metals from various …
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Beekmantown Formation-Middle Ordovician limestone unconformity on the northwest limb of the Green Ridge anticline near Fincastle, Virginia
… history can be summarized as follows: 1) Subtidal carbonate shelf sedimentation through Early Ordovician (and including early Middle Ordovician White Rock?) time represented by the Beekmantown Formation. 2) Emergence of a Beekmantown terrain due to eustatic lowering of sea level and inception …
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Sequence Stratigraphy and Chemostratigraphy Across the Permo-Triassic Extinction Event, Upper Khuff Carbonates, Ghawar Field, Saudi Arabia
… ramp succession include: subaqueous -and supratidal anhydrite, tidal flat laminites, lagoonal mudstone, ooid-peloid grainstone, and subtidal off-shoal open marine mudstone. Third order sequences include the Late Permian upper Khuff C, the Early Triassic Khuff B and the Khuff A sequences, which …
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Wintering Reddish Egret (Egretta Rufescens) Foraging Response To Environmental Variability On The Southern Texas Gulf Coast
… requirement, relying exclusively on coastal tidal flats throughout its yearly cycle. It is therefore vulnerable to stressors ranging from human coastal development to sea level rise due to climate change. While Reddish Egret breeding ecology has been well studied, little information is known …
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From Representative Period Selection to Process‐Based Sediment Dynamics
… Frisian Wadden Sea (NFWS) is a mixed-energy tidal system of interconnected tidal flats, channels, ebb-tidal deltas and barrier islands, in which tides, waves and wind jointly govern sediment transport. Despite its ecological and morphological significance, the region remains comparatively …
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Tidal distortion in shallow estuaries
… consequent time and magnitude asymmetries in tidal currents. Flood-dominant estuaries are characterized by longer falling tides and stronger flood currents while ebb-dominant estuaries have longer rising tides and stronger ebb currents. The asymmetries are reflected in the non-linear growth of …
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SOIL SALINITY AND SODICITY OF GALVESTON AND PELICAN ISLANDS, TEXAS
… the dredge material on Pelican Island, the tidal flats on the Galveston Bay coast, and the industrial areas close to the coastline. The large suburban and downtown area of Galveston Island had the lowest salinity and sodicity.</p>
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Depositional environments and diagenesis of carbonates and associated evaporites, Frobisher-Alida interval, Madison Group (Mississippian), Williston Basin, northwestern North Dakota
… marine, and restricted marine envirorunents, tidal flats, coastal sabkhas, and inner sabkha salt pans. The marginal marine and sabkha environments existed in a digitate morphology instead of parallel, linear, environmental belts common in other paleogeographic models. The Frobisher-Alida …
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The ecological role of feeding disturbances of the Atlantic horseshoe crab, Limulus polyphemus
… Horseshoe Crab Limulus polyphemus, on the intertidal mudflats of Great Bay estuary, New Hampshire, USA were used as the study system.</p><p>This study overcame methodological hurdles in the study of small localized disturbance over extensive areas of soft-sediments. Using a novel, low-cost …
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