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  • 1
    Keywords: Side Scan Sonar ; Geomorphologie
    Description / Table of Contents: Ohne Kurzreferat
    Type of Medium: Book
    Pages: IV, 141 S , Ill., graph. Darst., Kt
    Edition: 1. publ.
    Language: English
    Note: Literaturangaben
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  • 2
    Online Resource
    Online Resource
    San Diego :Elsevier Science & Technology,
    Keywords: Estuarine oceanography -- Congresses. ; Coasts -- Congresses. ; Marine sediments -- Congresses. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (309 pages)
    Edition: 1st ed.
    ISBN: 9780080537061
    Series Statement: Issn Series ; v.Volume 2
    DDC: 551.4609
    Language: English
    Note: Cover -- Preface -- Contents -- Contributors -- Section 1: Hydrodynamics and suspended particulate matter in bays and back-barrier tidal basins -- Chapter 1. Hydrodynamics of Chwaka Bay, a shallow mangrove-fringed tropical embayment, Tanzania -- Chapter 2. Tidal characteristics of an accretional tidal flat (The Wash, U.K.) -- Chapter 3. Quantifying concentration and flux of suspended particulate matter through a tidal inlet of the East Frisian Wadden Sea by acoustic doppler current profiling -- Section 2: Erosion, deposition, and sediment budgets of tidal flats -- Chapter 4. Surface erosion of fine-grained sediment revisited -- Chapter 5. Comparison of the erosion shear stress of oxic and anoxic sediments in the East Frisian Wadden Sea -- Chapter 6. Mass balancing the seasonal turnover of mud and sand in the vicinity of an intertidal mussel bank in the Wadden Sea (southern North Sea) -- Chapter 7. Mass balancing the seasonal turnover of POC in mud and sand on a back-barrier tidal flat (southern North Sea) -- Section 3: Primary production, nutrient fluxes and mineralisation in shallow coastal lagoons (Bodden) of the Baltic Sea -- Chapter 8. Significance of microphytobenthic primary production in the Bodden (southern Baltic Sea) -- Chapter 9. Bodden waters (southern Baltic Sea) as a source of methane and nitrous oxide -- Chapter 10. Geochemical investigations of iron and manganese in coastal sediments of the southern Baltic Sea -- Chapter 11. Phosphorus in sediments from coastal waters of Mecklenburg-Vorpommern (southern Baltic Sea) -- Chapter 12. Benthic microbial decomposition of organic matter and nutrient fluxes at the sediment-water interface in a shallow coastal inlet of the southern Baltic Sea (Nordrügensche Bodden). , Chapter 13. Significance of aerobic and anaerobic mineralization processes of organic carbon in sediments of a shallow coastal inlet in the southern Baltic Sea -- Section 4: Sediment geochemistry in salt-marshes and Holocene deposits -- Chapter 14. Effects of plant roots on salt-marsh sediment geochemistry -- Chapter 15. Elemental composition of siderite grains in early Holocene deposits of Youngjong Island (west coast of Korea), and its palaeoenvironmental implications -- Section 5: Sea-level rise, land reclamation, and resource management -- Chapter 16. The impacts of sea-level rise on the coastal fisheries resources and aquatic ecosystems of Cameroon (Central Africa) -- Chapter 17. Impacts of sea-level rise and human activities on the evolution of the Pearl River delta, South China -- Chapter 18.The combined impacts of mean sea-level rise and secular trends in mean tidal range on the marine environment in the vicinity of the Huanghe River mouth -- Chapter 19. The missing mud flats of the Wadden Sea: a reconstruction of sediments and accommodation space lost in the wake of land reclamation -- Chapter 20. The Wadden Sea squeeze as a cause of decreasing sedimentary organic loading -- Chapter 21. The utilization of coastal tidal flats: a case-study on Integrated Coastal Area Management from China.
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  • 3
    Online Resource
    Online Resource
    Newark :John Wiley & Sons, Incorporated,
    Keywords: Marine sediments -- Congresses. ; Sediments (Geology) -- Congresses. ; Tidal currents -- Congresses. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (382 pages)
    Edition: 1st ed.
    ISBN: 9781444304145
    Series Statement: International Association of Sedimentologists Series ; v.28
    DDC: 551.3/6
    Language: English
    Note: Intro -- Tidal Signatures in Modern and Ancient Sediments -- Contents -- Preface -- Modern Tidal Processes and Sediment Dynamics -- What is a bedload parting? -- Hydraulic roughness of tidal channel bedforms, Westerschelde estuary, The Netherlands -- Bedforms on the Middelkerke Bank, southern North Sea -- Storm-enhanced sand transport in a macrotidal setting, Queen Charlotte Islands, British Columbia, Canada -- Modern Tide-dominated Environments and Facies -- Occupation of a relict distributary system by a new tidal inlet, Quatre Bayou Pass, Louisiana -- Morphological response characteristics of the Zoutkamperlaag, Frisian inlet (The Netherlands), to a sudden reduction in basin area -- Sedimentological implications of morphodynamic changes in the ebb-tidal delta, the inlet and the drainage basin of the Zoutkamperlaag tidal inlet (Dutch Wadden Sea), induced by a sudden decrease in the tidal prism -- Stratigraphy of a combined wave- and tide-dominated intertidal sand body: Martens Plate, East Frisian Wadden Sea, Germany -- Sedimentation in the mesotidal Rias Bajas of Galicia (north-western Spain): Ensenada de San Simon, Inner Ria de Vigo -- Holocene estuarine facies along the mesotidal coast of Huelva, south-western Spain -- The tidal character of fluvial sediments of the modern Mahakam River delta, Kalimantan, Indonesia -- Tidal lamination and facies development in the macrotidal flats of Namyang Bay, west coast of Korea -- Patterns of sedimentation in the macrotidal Fly River delta, Papua New Guinea -- Foraminifers as facies indicators in a tropical macrotidal environment: Torres Strait-Fly River delta, Papua New Guinea -- Submarine cementation in tide-generated bioclastic sand dunes: epicontinental seaway, Torres Strait, north-east Australia -- Ancient Tidal Processes and Sediment Dynamics. , Reconstruction of tidal inlet and channel dimensions in the Frisian Middelzee, a former tidal basin in the Dutch Wadden Sea -- Comparison of ancient tidal rhythmites (Carboniferous of Kansas and Indiana, USA) with modern analogues (the Bay of Mont-Saint-Michel, France) -- Ancient Tide-dominated Environments and Facies -- Sequence stratigraphy of the late Pleistocene Palaeo-Tokyo Bay: barrier islands and associated tidal delta and inlet -- Diurnal inequality pattern of the tide in the upper Pleistocene Palaeo-Tokyo Bay: reconstruction from tidal deposits and growth-lines of fossil bivalves -- Climbing ripples recording the change of tidal current condition in the middle Pleistocene Shimosa Group, Japan -- Internal geometry of ancient tidal bedforms revealed using ground penetrating radar -- Tide-dominated sedimentation in the upper Tertiary succession of the Sitapahar anticline, Bangladesh -- Evidence of tidal influence in the Murree Group of rocks of the Jammu Himalaya, India -- Index -- Colour plates facing p. 62, p. 86 and p. 110.
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  • 4
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract While shoreface-connected sand ridges may be molded by storm-generated waves and currents, calmweather counterparts may determine their longevity in the German Bight. Fair-weather flow measurements on shoreface ridges off Spiekeroog Island show that: (1) peak velocities (U100 max) mostly range from 30 to 60 cm s−1 and are flood asymmetric, except at neap tide when ebb flows are dominant in ridge troughs; (2) velocity contrast between accelerating and decelerating flow phases is higher for ebb than flood currents, suggesting intense interaction between inlet and shoreface ebb currents; and (3) tidal currents play a primary role in ridge maintenance.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Aquatic ecology 28 (1994), S. 289-297 
    ISSN: 1573-5125
    Keywords: Wadden Sea ; backbarrier ; intertidal ; mussel bed ; Mytilus ; biodeposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Seasonal trends of biodeposition and animal coverage in backbarrier beds of the musselMytilus edulis in the East Frisian Wadden Sea were documented and quantified to assess the effects of physical disturbance by storms and to develop a conceptual model for the interpretation of biodeposits in the stratigraphic record. Accretion and erosion of biogenic muds (faeces and pseudofaeces) were quantified by repeated precision levelling of a 12 m2 test area. Animal coverage was documented by vertical photography prior to each levelling survey. Levelling and photography were conducted from a bridge and rail system to avoid physical disturbance by trampling. Four surveys, covering a period of different weather conditions, showed variable mean accretion/erosion rates of biodeposits ranging from +0.56 mm d−1 (accretion) to −1.34 mm d−1 (erosion) and areal coverage of mussels ranging from 39.1% to 0%. A pronounced seasonal trend in the biodepositional pattern was observed. Mean accretion rates were high (〉0.5 mm d−1) during the summer season, whereas in the winter season net deposition decreased to zero or showed erosional trends. Longterm sediment budgets are thus composed of highly variable mean annual rates which, in turn, comprise highly variable seasonal and even monthly rates, depending on the local weather pattern. This forms the basis for a conceptual model, in terms of which the stratigraphic record of fossil biodeposits can be meaningfully interpreted.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Aquatic ecology 28 (1994), S. 299-307 
    ISSN: 1573-5125
    Keywords: Sediment depletion ; tidal flats ; land reclamation ; Wadden Sea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Grain size distribution patterns along the East Frisian coast (German Wadden Sea) were evafuated with the aim of identifying potential effects of man-made structures (e.g. dikes) on the textural composition and sediment budget of the area. It was found that the distribution of various grain size fractions and settling velocities revealed a well-defined cross-shore energy gradient. Adjacent to the mainland dike the sediment is dominated by the 3.0–3.5 phi sand fraction (〉70% by weight). In comparison to the sedimentary sequences normally observed in unobstructed backbarrier depositional environments, the sediments along the land-ward margin are in this case conspicuously depleted in grain sizes 〈3.5 phi, the corresponding size fractions contributing 〈20% by weight. This suggests that the dike interrupts the normal energy gradient, thereby inhibiting the deposition of sediments with settling velocities 〈0.5 cm s−1. This interpretation is confirmed when comparing individual cross-shore transects. The shorter the transect between the barrier island shore and the dike, the greater the fine sediment depletion. Since many faunal assemblages are grain-size specific, it is further suggested that the backbarrier ecosystem must have undergone significant modifications as a result of the substantial reduction in mud flats since the onset of dike construction some 1000 years BP. It is predicted that in the wake of the persisting and possibly accelerating sealevel rise this process of fine sediment depletion will continue and also affect progressively coarser sediments.
    Type of Medium: Electronic Resource
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  • 7
    Publication Date: 2022-05-19
    Description: The concept of grain size is critically reviewed and it is demonstrated that the conventional sieve method has some serious, system-inherent shortcomings. Sieve diameters do in many cases not reflect the requirements set by the theory on which they are based. The advantages of an alternative method of size analysis are discussed, in which the settling velocities of sedimentary particles in water are measured. These are then converted into standardized size equivalents and it is argued that the hydraulic nature of settling diameters provides more meaningful results for the study of depositional processess and animal-sediment relationships. A low-cost settling tube system, that is easy to build and simple to operate, is presented. lt is extremely fast when compared to conventional sieving and provides a significantly higher resolution of grain size distributions. The data is ideally suited for the application of moment measures for the computation of grain size statistics.
    Type: Article , NonPeerReviewed
    Format: text
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  • 8
    Publication Date: 2012-06-01
    Description: :— Patterns of surficial sediment distribution across shoreface-connected sand ridges located along the barrier-island coast of the southern North Sea generally show a strong affinity between textural parameters and ridge morphology, comparable to that observed in other parts of the world. Thus, the sediment of the upper shoreface and the inner ridge crest consists of fine sand (water depths 〈 12 m). The troughs between the ridges, by contrast, comprise medium to coarse sands with occasional gravel, whereas the ridge flanks are characterized by fine to medium sands with a coarsening trend towards the troughs (water depths 〉 12 m). In order to assess the mobility of the sediments and the consistency of the observed textural patterns, two high-resolution multi-beam bathymetric surveys were carried out along selected corridors across a ridge and trough system off Spiekeroog island, located along the southern North Sea coast of Germany, one in 2003, the other in 2007. The bathymetric data of the two surveys show only small-scale topographic changes. These were produced mainly by local changes in the bedform patterns on the inner ridge. The bathymetric surveys therefore document a remarkable morphological stability of the ridges over time periods of several years. Spatial and temporal variations in the distribution of standard textural parameters were assessed on the basis of 95 sediment samples recovered on the same grid in 1989 and 2005. These data show that, for example, the distribution of coarse sand (0–1 phi) became enhanced along the axis of the outer trough, while expanding onto the lower ridge flanks. Current measurements in fair weather demonstrate that the coarse sediments cannot be moved by the local tidal currents. The observed changes in the distribution of coarse sand, and in particular its expansion onto the adjacent ridge flanks, must therefore be associated with wave action, probably in combination with tidal currents. This is supported by an assessment of the entrainment potential of coarse sand ( D = 1 mm) by typical waves during storms ( T = 8 s; H = 2.5 m) and fair weather ( T = 4 s; H = 0.7 m). The results demonstrate that the effective wave base for coarse sand during fair-weather conditions is limited to a water depth of 4.8 m, whereas during storms it exceeds a depth of 26.4 m. The mobility of the coarse sands in the outer trough at water depths 〉 16 m, and with it the morphodynamics of the ridges as a whole, is thus clearly controlled by the superimposition of storm waves on the tidal current regime.
    Print ISSN: 1527-1404
    Topics: Geosciences
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