Relevant bibliographies by topics / Morphology of the continental shelf

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Academic literature on the topic 'Morphology of the continental shelf'

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Published: 25 May 2024

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Journal articles on the topic "Morphology of the continental shelf"

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Hải, Nguyễn Tiến, Phùng Văn Phách, and K. Stattegger. "Xác định cấu trúc hình thái của châu thổ cửu long trên thềm lục địa ven bờ Cà Mau trên cơ sở tài liệu địa chấn nông phân giải cao." VIETNAM JOURNAL OF EARTH SCIENCES 30, no. 4 (May 13, 2008): 356–62. http://dx.doi.org/10.15625/0866-7187/31/4/11777.

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Goes, Enatielly Rosane, and Antônio Vicente Ferreira Júnior. "Caracterização Morfossedimentar da Plataforma Continental Brasileira (Morphosedimentary characterization of the Brazilian Continental Shelf )." Revista Brasileira de Geografia Física 10, no. 5 (July 9, 2017): 1595. http://dx.doi.org/10.26848/rbgf.v.10.5.p1595-1613.

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Este trabalho discute as diferenciações existentes ao longo da plataforma continental brasileira, bem como sua gênese e evolução. Foi realizada uma pesquisa bibliográfica afim de evidenciar as particularidades da mesma, especialmente do setor pernambucano, reconhecido como último elo de ligação entre os continentes americano e africano. A morfologia e as características sedimentológicas da área em estudo são altamente influenciadas por diferentes condições climáticas, hidrológicas e aporte sedimentar continental ao longo do território brasileiro, além de diferentes estágios de formação e evolução da margem continental brasileira. Assim estes fatores promovem quatro grandes diferentes setores na plataforma continental brasileira. O setor norte, marcado pela largura ampla e predomínio de sedimentação terrígena, recebe grande influência continental pela presença de grandes rios e clima equatorial. O setor nordeste, mais estreito e com predomínio de sedimentação biogênica, recebe grande influência marinha, com território continental desprovido de grandes rios, de clima tropical e semiárido. A porção central da plataforma continental brasileira apresenta as mesmas características hidrológica, climática e sedimentar do setor anterior, contudo com larguras geralmente menores, como é o caso da plataforma adjacente ao município de Salvador. No setor sul volta a se apresentar mais progradante com predomínio de sedimentação terrígena, voltando a receber vasta influência continental, com ocorrência de rios mais relevantes e clima subtropical. A B S T R A C TThis paper discusses the existing differences along the Brazilian continental shelf, as well as its genesis and evolution. A bibliographical research was carried out in order to highlight its peculiarities, especially in Pernambuco’s sector recognized as the last link between the American and African continents. The morphology and sedimentological characteristics of the studied area are highly influenced by different climatic, hydrological and continental sedimentary contribution conditions along the Brazilian territory, besides different stages of formation and evolution of the Brazilian continental margin. Thus, these factors are responsible for four large sectors in the Brazilian continental shelf. The northern sector, marked by wide width and predominance of terrigenous sedimentation, receives great continental influence, due to the presence of large rivers and equatorial climate. The Northeast sector, which is narrower and has a predominance of biogenic sedimentation, receives great marine influence, the continental territory is devoided of large rivers, with tropical and semi-arid climate. The central portion of the Brazilian continental shelf presents the same hydrological, climatic and sedimentary characteristics of the previous sector, however usually with smaller widths; this is the case of the platform adjacent to the municipality of Salvador. The southern sector presents more prograde with a predominance of terrigenous sedimentation, receiving once again vast continental influence, with more relevant rivers and subtropical climate.Keywords: morphology, sedimentary dynamics, continental margin, Pernambuco.
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Gutierrez-Mas, J. M., A. Lopez-Galindo, and F. Lopez-Aguayo. "Clay minerals in recent sediments of the continental shelf and the Bay of Cádiz (SW Spain)." Clay Minerals 32, no. 4 (December 1997): 507–15. http://dx.doi.org/10.1180/claymin.1997.032.4.02.

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AbstractThe distribution of clay minerals in recent sediments on the continental shelf and in the Bay of Cádiz has been analysed as part of a wider study of sedimentary exchange between the continent and the continental margin. The clay minerals included in the muddy sediments consist mainly of illite, kaolinite, smectite, randomly mixed-layered illite-smectite, chlorite, vermiculite and randomly mixed-layered illite-chlorite. Distribution of the minerals indicates that inheritance from the adjacent continental areas is the most important process involved.The relations between the clay minerals were established by Q-mode and R-mode factor analysis. The main clay mineral associations are: (1) illite-kaolinite, (2) smectite-random mixed-layered illitesmectite, and (3) kaolinite-random mixed-layered illite-smectite-vermiculite. The main sources of sediment supply to the continental shelf are the Guadalquivir and Guadiana rivers. Sediment from these rivers and from the rivers flowing into the Bay of Cádiz (mainly the Guadalete) is transported to the part of the shelf outside the bay by ebb-tide currents. The path of this outflow to the continental shelf, where the sediment is partially deposited, is influenced by the morphology of the coast and by hydrodynamic processes.
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ten Brink, Uri S., and Christopher Schneider. "Glacial morphology and depositional sequences of the Antarctic continental shelf." Geology 23, no. 7 (1995): 580. http://dx.doi.org/10.1130/0091-7613(1995)023<0580:gmadso>2.3.co;2.

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Tayton, J. W., A. D. Albani, and J. G. Hoffman. "Cainozoic morphology of the inner continental shelf near Sydney, N.S.W." Journal and proceedings of the Royal Society of New South Wales 121, no. 1-2 (October 1988): 11–28. http://dx.doi.org/10.5962/p.361251.

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Eakins, Barry W., Margot L. Bohan, Andrew A. Armstrong, Meredith Westington, Jennifer Jencks, Elliot Lim, Susan J. McLean, and Robin R. Warnken. "NOAA's Role in Defining the U.S. Extended Continental Shelf." Marine Technology Society Journal 49, no. 2 (March 1, 2015): 204–10. http://dx.doi.org/10.4031/mtsj.49.2.17.

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AbstractThe legal continental shelf is a maritime zone that typically goes out to 200 nautical miles from shore. It may, however, be extended beyond 200 nautical miles, based in part on the morphology of the continental margin. The United Nations Convention on the Law of the Sea sets forth the requirements for how coastal countries can legally define such an extended continental shelf (ECS), within which they may manage the natural resources on and below the seabed. The National Oceanic and Atmospheric Administration (NOAA), along with the U.S. Geological Survey and the U.S. Department of State, is working to map, analyze, and define the seaward extent of the U.S. ECS. New advances in maritime technologies, such as improved multibeam echosounders, and associated visualization and analysis software aid in this effort by enabling project scientists to better understand seafloor geomorphology and interpret local and regional geologic processes. Marine geophysical data collected during this project are publicly available, benefiting the broader scientific community and public through timely data access and long-term preservation. To date, NOAA has led more than 30 high-resolution surveys and mapped more than 2 million square kilometers of sea floor in support of the U.S. ECS effort. New discoveries have been made during these surveys, and the data have contributed to better understanding of the morphology and geology of the U.S. continental margins.
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Chaytor, Jason. "Geologic features at the continental shelf edge and their influence on acoustic propagation and scattering." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A25. http://dx.doi.org/10.1121/10.0015420.

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The continental shelf edge, encompassing the seaward edge of the continental shelf and the upper continental slope, is a region of significant variation in the physical, chemical, and biological character of the ocean and seabed. The surficial and shallow sub-surface geologic features across this transition from the seaward-dipping shelf to the steeper upper slope reflect a spectrum of modern and antecedent constructional and destructional processes, each affecting acoustic propagation and scattering. Geologic features across the shelf edge are created by eustatic and regional sea level change, glacial processes, development and abandonment of fluvial pathways, and variations in slope stability. These geologic features are further modified by seasonal and persistent water column and bottom-water boundary layer physical processes, diagenetic modification, and biological activity supported by nutrient rich upwelling. Using examples from the southern New England shelf edge (SNESE), the scale, morphology, formative processes of shelf edge features and their impact on acoustic propagation and scattering will be presented. The SNESE has been shaped by a combination of glacial and interglacial processes resulting in a region with a complex seabed environment characterized by features such as variable surficial sediment, pockmarks, landslide scars, and submarine canyons. [Work supported by the Office of Naval Research.]
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Kluiving, S. J., L. R. Bartek, and F. M. van der Wateren. "Multi-scale analyses of subglacial and glaciomarine deposits from the Ross Sea continental shelf, Antarctica." Annals of Glaciology 28 (1999): 90–96. http://dx.doi.org/10.3189/172756499781822039.

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AbstractPiston cores collected from the Ross Sea continental shelf, Antarctica, were studied as part of a multi-scale analysis of glacial and glaciomarine stratigraphy and sedimentology. The objective of these analyses was to differentiate glaciomarine sediments from subglacially deformed tills. Results from analyses of microstructures, lithofacies and seafloor morphology indicate that glaciomarine and subglacially deformed sediments can be clearly distinguished and further characterized by variations in textural parameters. Overcompaction, as well as presence of stratification in sediments, are not considered critical criteria for distinguishing subglacial from glaciomarine deposits. Trough-shaped morphologies and fluted terrain strongly correlate with S-C and S-C-C- type shear-zone microstructures and indicate that subglacial deformation is an important process in these areas, confirming the presence of grounded ice on the shelf during formation of these landforms and deposits. Flat, smooth topographies, as well as (low-angle) slope environments, correspond to microfabrics which lack microscopic shear-zone geometries and contain dropstones, angular-sediment clasts, large-shell fragments and slight sorting in sandy layers, which imply ice-shelf or open-water conditions present during deposition.
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Dickinson, William R. "Geological perspectives on the Monte Verde archeological site in Chile and pre-Clovis coastal migration in the Americas." Quaternary Research 76, no. 2 (September 2011): 201–10. http://dx.doi.org/10.1016/j.yqres.2011.06.011.

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AbstractDiscovery of the Monte Verde archeological site in Chile overturned the previous consensus that the first Americans into the New World from Asia were the makers of Clovis projectile points, and rejuvenated the hypothesis that migration through the Americas occurred largely on portions of the Pacific continental shelf exposed by Pleistocene drawdown in eustatic sea level. The postulate of travel along a paleoshoreline now hidden underwater is an attractive means to posit pre-Clovis human movement southward from Beringia to Chile without leaving traces of migration onshore. Geologic analyses of the Pleistocene paleoenvironment at Monte Verde and of the morphology of the potential migration route along the continental shelf raise questions that have not been fully addressed. The periglacial setting of Monte Verde may call its antiquity into question and the narrowness of the Pacific continental shelf of the Americas makes it unlikely that people could travel the length of the Americas without impacting ground still onshore and no farther inland than Monte Verde itself. Geological perspectives on Monte Verde and coastal migration jointly suggest that the Clovis-first hypothesis for peopling the New World may have been abandoned prematurely.
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D’Agostini, Danielle P., Alex C. Bastos, Gilberto M. Amado-Filho, Claudia G. Vilela, Thaís C. S. Oliveira, Jody M. Webster, and Rodrigo L. Moura. "Morphology and sedimentology of the shelf-upper slope transition in the Abrolhos continental shelf (east Brazilian margin)." Geo-Marine Letters 39, no. 2 (March 6, 2019): 117–34. http://dx.doi.org/10.1007/s00367-019-00562-6.

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Dissertations / Theses on the topic "Morphology of the continental shelf"

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Duncan, Catherine Schuur. "Latest Quaternary stratigraphy and seafloor morphology of the New Jersey continental shelf /." Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3008320.

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Correia, Ricardo Lionel Gonçalves. "Detailed seafloor morphology of the East Antarctic continental shelf, between 128º and 134ºE." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/18063.

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Mestrado em Engenharia Geológica
Dados de batimetria multifeixe e de sísmica de alta resolução, adquiridos na plataforma continental da Antártida, região Este, permitiram o reconhecimento de aspetos geomorfológicos derivados da dinâmica glaciar associada a um manto de gelo mais extenso no passado. No âmbito do projeto científico Norte-americano, Vulnerability of East Antarctic ice shelves da NSF (National Science Foundation), e do projeto EAIS-MARGINS do Programa Polar português (PROPOLAR), foi realizada a interpretação e análise quantitativa dos diversos aspetos morfológicos através da morfometria e análise estatística, com o objetivo de melhor entender a dinâmica do manto de gelo no passado. A área de estudo inclui um segmento da plataforma continental compreendida entre os glaciares Frost e Dibble (128ºE e 134ºE). Os dados foram adquiridos na campanha de investigação NBP1503 em Abril de 2015, a bordo do navio RVIB Nathaniel B. Palmer dos Estados Unidos da América. Os resultados revelam uma plataforma continental situada entre os 300 e 990 m de profundidade. A zona proximal e intermédia é caracterizada por um aspeto irregular, onde é possível constatar a presença de meltwater channels com mais de 230 m de profundidade e formas semelhantes a drumlins, identificadas entre os 800 e 900 m de profundidade. Sulcos deixados pela deriva de icebergs são esporadicamente observados na zona distal da plataforma continental entre os 380-410 m de profundidade. No limite da plataforma continental encontra-se presente um sistema de gullies que se desenvolvem ao longo do talude. Além disso a análise quantitativa dos aspetos morfológicos associados às formas de drumlin e gullies permitiu uma descrição morfológica mais detalhada, e encontrar padrões que permitiram obter mais informações sobre os fatores de controlo envolvidos durante a sua formação. A distribuição observada das diferentes morfologias identificadas é coerente com estudos anteriormente realizados e constituem uma forte evidência de que o manto de gelo teve uma extensão até ao limite da plataforma continental e que a sua dinâmica foi mais ativa do que se tem constatado.
Swath bathymetric and sub-bottom CHIRP data collected on the East Antarctica continental shelf and seaward allowed detailed mapping of the geomorphic features formed during past times of extended grounded ice from an expanded East Antarctic Ice Sheet (EAIS). Under the umbrella of the American National Science Project 'Vulnerability of East Antarctic ice shelves' and the Portuguese PROPOLAR project EAST-MARGINS, the seafloor morphology was interpreted and submitted to quantitative analyses, through morphometry and statistical analysis, to better understand the EAIS dynamic in the past. The study area included a segment of the continental shelf, slope and rise between the Frost and Dibble Glaciers (128ºE and 134ºE). The data were collected during the cruise NBP1503 in April 2015, on board the U.S. RVIB Nathaniel B. Palmer. The results revealed a continental shelf with depths varying between 300 m and 990 m. The inner and mid shelf area is characterised by a crudely streamlined landscape where subglacial meltwater channels up to 230 m deep and drumlin-like bedforms at 800-900 m water depth have been identified. Sporadic iceberg scours occur in the outer continental shelf between 380-410 m of water depth. The shelf break is defined by a gully system which extends along the continental slope, followed by sediment mounds observed on the continental rise. Moreover, quantitative analyses on drumlin-like bedforms and gullies allowed a further morphological description to better delineate patterns, and provided more details related to the controlling factors involved during their formation. The distribution of identified glacial features is coherent with other previous studies and constitutes a strong evidence that the grounded ice reached the continental shelf break in the past and was more dynamic than previously thought.
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Lafosse, Manfred. "Distribution et enregistrement de la déformation en contexte de convergence oblique : évolution géodynamique de la marge marocaine du bassin d’Alboran au Plio-Quaternaire." Electronic Thesis or Diss., Paris 6, 2017. http://www.theses.fr/2017PA066651.

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La convergence oblique des plaques tectoniques par rapports aux marges continentales conduit à la distribution de la déformation entre zones soulevées et zones en subsidence. Dans ce contexte, les mouvements verticaux peuvent être contrôlés par l’héritage structural et peuvent influencer l’architecture des dépôts sédimentaires de la plateforme continentale et du bassin profond. La sismique réflexion et la bathymétrie permettent d’imager les architectures des plateformes et du bassin profond. En Méditerranée Occidentale, la convergence Afrique-Eurasie et le contexte d’arrière-arc contrôle depuis le Miocène la déformation du domaine d’Alboran. La convergence oblique a conduit à la formation de grandes structures transpressives traversant le bassin et de couloirs décrochants Miocène réutilisant localement les limites des nappes chevauchantes mises en place lors de la collision Oligo-Miocène. Trois aspects sont développés dans cette thèse: 1) la caractérisation des structures tectoniques actives et Pléistocène associées au bassin de Nekor, un bassin périphérique du domaine d’Alboran situé sur sa marge sud, et la démonstration de l’importance de l’héritage Oligo-Miocène dans l’évolution de ce bassin, 2) le décryptage de l’architecture de la plateforme sédimentaire du bassin de Nekor, pour proposer un modèle d’âge des séquences de dépôts pour les derniers 500 000 ans, et enfin 3) la démonstration de l’influence de la segmentation de la marge par la tectonique sur la géométrie de la plateforme sédimentaire, l’histoire de l’évolution des plis et des failles décrochantes affectant le bassin profond depuis le Pliocène et la chronologie des structures décrochantes
The oblique convergence of the tectonic plates with respect to the continental margins leads to the distribution of the deformation between raised zones and subsidence zones. In this context, vertical movements can be controlled by the structural inheritance and can influence the architecture of the sedimentary deposits of the continental shelf and the deep basin. Seismic reflection profiles and high resolution bathymetry allow to image the continental shelf and the deep basin. In the western Mediterranean, the African-Eurasian convergence and the back-arc context have controlled the deformation of the Alboran domain since the Miocene. The oblique convergence led to the formation of large transpressive structures crossing the Alboran basin and Miocene strike-slips faults reusing locally the boundaries of the thrust sheet set up during the Oligo-Miocene collision. Three aspects are developed in this thesis: 1) the characterization of the Pleistocene tectonic structures associated with the Nekor basin, a peripheral basin of the Alboran domain situated on its southern margin, with an emphasis on the importance of the alpine inheritance in the evolution of this basin, 2) the decoding of the architecture of the Nekor basin sedimentary platform, to propose an age model of deposited sequences for the last 500 000 years, demonstrating the influence of the tectonic segmentation of the margin on the geometry of the sedimentary platform, 3) the history of the evolution of folds and faults affecting the deep basin from the Pliocene and the chronology of the tectonic structures from the Messinian Salinity Crisis to present-day
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Kime, Brittany. "The Effects of Sediment Properties on Barrier Island Morphology and Processes: A Numerical Modeling Experiment." ScholarWorks@UNO, 2018. https://scholarworks.uno.edu/td/2571.

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Barrier island restoration and nourishment is necessary for sustaining coastal systems worldwide. In the Mississippi River Delta Plain, the lack of sediment supply, relative sea level rise, and reworking of abandoned delta lobes promote rapid disintegration of barriers, which can contribute to mainland storm impacts. Barrier island restorations that utilize higher quality sediments (Outer Continental Shelf- OCS) are expected to exhibit higher resiliency, withstanding coastal erosion, event-induced erosion, and ongoing transgression when compared to barriers nourished using lower quality nearshore (NS) sands. Additionally, use of OCS sediments increases sediment supply by adding material to the system supporting increased barrier longevity by maintaining a subaerial footprint longer compared to NS sediments. We used the Delft3D modeling suite to study barrier geomorphic trajectories nourished using OCS/NS sands, compared with control simulations with no nourishment. Resulting morphologies from 18 simulations with forcing that included annualized forcing, storms, and SLR are evaluated and compared.
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Ardhuin, Fabrice. "Swell across the Continental Shelf /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2001. http://handle.dtic.mil/100.2/ADA397242.

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Dissertation (Ph.D. in Oceanography) Naval Postgraduate School, Sept. 2001.
Dissertation supervisor, Herbers, Thomas H. C. "September 2001." Includes bibliographical references (p. 167-176). Also Available online.
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Evangelidis, Dimitrios. "Infragravity waves on the continental shelf." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA311719.

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Tinder, Cynthia Viernes. "Swell transformation across the continental shelf." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA380797.

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Thesis (M.S. in Meteorology and Physical Oceanography) Naval Postgraduate School, June 2000.
Thesis advisor(s): Herbers, Thomas H.C. "June 2000." Includes bibliographical references (p. 55-56). Also available in print.
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Hendrickson, Eric J. "Swell propagation across a wide continental shelf." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA310478.

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Dewey, Richard Kelvin. "Turbulent energy dissipation over the continental shelf." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26998.

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A free-falling instrument was used in coastal waters to measure turbulent velocity fluctuations, temperature, conductivity and pressure from the near surface to 15 cm above the bottom. A probe guard system has been developed that protects the delicate temperature and shear sensors from bottom sediments and minimizes instrument vibrations that would otherwise contaminate the shear signal. From the shear signal the viscous dissipation rate of turbulent kinetic energy is calculated. A new technique is presented for the analysis of shear spectra for dissipation rate calculations. The identification and elimination of noise, both at low and high frequencies, is accomplished by a positive feedback loop during analysis and insures more accurate estimates of the microstructure shear variance, [formula omitted]. The technique improves the confidence in the dissipation rate estimates and results in a noise level of 3.0 X 10⁻⁷ W m⁻³. This noise level is low, considering the structural modifications made to the profiler for near-bottom sampling. The microstructure instrument was used for 670 profiles over the continental shelf west of Vancouver Island in June, 1985. From the dissipation rates near the bottom, within the constant stress layer, values of the bottom stress are calculated. Variations in the bottom stress and the height of the turbulent bottom boundary layer correlate with the diurnal tidal currents that dominate the flow near the bottom. The height of the bottom well mixed layer was found to be nearly independent of the height of the turbulent bottom boundary layer. Over most of the shelf, vertical density variations are attributable to advection rather than local mixing. Near shore, in depths less than 100 m, the tidally driven turbulent bottom boundary layer extends throughout most of the water column during periods of maximum tidal current. Seaward of the 100 m depth contour the current and density measurements above the bottom boundary layer, 40 to 50 m above the bottom, reveal the mean structure of the Tully eddy. Contours of constant density show that the structure is an upwelling centre confined to a region over part of the Juan de Fuca Canyon system. Turbulent mixing within the core of the eddy was found to be weak. Oxygen samples indicate that the wind-induced upwelling brings slope water up the canyons to the shallow (<100 m) banks near shore. Nutrients in the slope water are mixed vertically by the tidally driven bottom boundary layer over these banks. Flux rates for NO₃ of 387 mmole s⁻¹ per metre of coastline are estimated during the strong upwelling conditions in June, 1985. From the turbulent dissipation rate measurements within the bottom boundary layer an estimated lower limit to the decay scale for the K₁ period shelf wave is roughly put at 1100 km. This is in good agreement with the model of Brink (1982a). From the dissipation rate measurements above the bottom boundary layer, a friction decay time scale for the Tully eddy is estimated to be 231 hours. This is supported by the observations of Freeland and Mcintosh (1987, personal communication) that show large, frequent fluctuations in the circulation at periods of ~ 20 to 330 hours. A global dissipation of 4.8 x 10¹⁰ W is estimated for the tides over all continental shelf regions, only 2.5% of the total tidal kinetic energy dissipated by friction in all the oceans and seas.
Science, Faculty of
Earth, Ocean and Atmospheric Sciences, Department of
Graduate
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de, Wet Willem Myburgh. "Bathymetry of the South African Continental Shelf." Master's thesis, University of Cape Town, 2013. http://hdl.handle.net/11427/28970.

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South Africa has an extensive coastline offshore of which lies the prominent South African continental shelf, a relatively flat extension of the onshore coastal plain. The continental shelf is host to major mineral and petroleum deposits, home to South Africa’s major sea fisheries and full of navigation hazards. Therefore, knowledge of the seafloor features, or bathymetry, of the continental shelf is essential to understanding both its long-term geological evolution and present-day use for resources and navigation. Unfortunately there has been little advancement in our knowledge of the South African continental shelf since the marine studies of the 1970’s and 1980’s which culminated in the “Bathymetry around Southern Africa” map of Dingle et al. (1987). Although bathymetric mapping equipment and techniques have greatly improved during the last few decades, very little high resolution bathymetric data of the South African continental margin are currently available for scientific use, with the majority of the high resolution multi-beam echo-sounding bathymetric surveys being undertaken by privately owned mineral exploration and mining companies (such as De Beers, Alexkor, Petro SA, Petroleum Agency of South Africa, etc.), the Council for Geoscience and the South African Navy and Hydrographic Office. More recent advances in satellite altimetry have had a major impact on ocean floor bathymetric mapping especially in deep ocean areas where the sea surface generally reflects the underlying bathymetry. The Department of Agriculture, Forestry and Fisheries (DAFF) annually collect single-beam echo-sounding data in order to monitor the abundance of fish species along the South African continental shelf and along with that collect seafloor bathymetry as an additional benefit. The aim of this project is to create a detailed bathymetric map of the continental shelf of South Africa by using digital single-beam echo-sounding data collected by the Fisheries Division of the DAFF over the last two decades. The bathymetric dataset of ±7 million single-beam echo-sounding data points was manually processed, gridded and exported to produce a detailed bathymetric map of the entire South African continental shelf between the Orange River mouth and Kosi Bay complemented by Satellite Altimetry data from the ETOPO 1 – 1 Arc-Minute Global Relief Model (Amante and Eakins 2009) for the deep ocean area adjacent to the continental shelf. The single- beam bathymetric data were collected by the F.R.S. Africana II and F.R.S. Algoa vessels using SIMRAD EKS-38, EK 400, EK 500 and more recently the EK 60 single-beam echo-sounders along with a the SIMRAD ES38B split beam transducer. The West Coast and South Coast margins have the greatest bathymetric detail due to DAFF’s Cape Town base of operations, whilst the East Coast margin is less detailed due to fewer research campaigns in this area. The Bathymetric Map of the South African Continental Margin produced in this thesis reveals several new and more detailed bathymetric features. New bathymetric features include the northern extension of the Olifants Valley submarine canyon, details of the rocky inner shelf related to glacial period sea level lowstands, as well as the coast parallel wave cut terraces and palaeo dune ridges on the middle shelf between Cape Seal and Cape Recife. Other prominent bathymetric features such as Childs Bank, Cape Canyon, Cape Point Valley, the offshore submerged river valleys of the Breede and Gouritz Rivers and the east-west trending, basement anticlinal ridges situated at the southernmost extent of the Agulhas Arch were revealed in greater detail by this study. The underlying geology, physical Oceanography, drainage patterns as well as eustatic sea-level fluctuations can all be linked to the bathymetry of the continental shelf, which is why this thesis examines the influences of each of these factors on the seafloor morphology around the South African coastline.
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Books on the topic "Morphology of the continental shelf"

1

Seabed morphology of the Russian Arctic Shelf. New York: Nova Science Publishers, 2010.

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Valentine, Page C. The shelf-slope transition--canyon and upper slope sedimentary processes on the southern margin of Georges Bank: An examination of sedimentary environments in water depths of 150-600 meters and of how they are determined by the interaction of available sediment, bottom currents, and sea-floor morphology. Washington, D.C: U.S. G.P.O., 1987.

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Valentine, Page C. The shelf-slope transition--canyon and upper slope sedimentary processes on the southern margin of Georges Bank: An examination of sedimentary environments in water depths of 150-600 meters and of how they are determined by the interaction of available sediment, bottom currents, and sea-floor morphology. Washington, DC: U.S. Geological Survey, 1987.

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R, Martins L., Corrêa I. C. S, and Universidade Federal do Rio Grande do Sul. Centro de Estudos de Geologia Costeira e Oceânica., eds. Atlas: Morphology and sedimentology of the Southwest Atlantic coastal zone and continental shelf from Cabo Frio (Brazil) to Península Valdés (Argentina). Porto Alegre, RS, Brazil: Universidade Federal do Rio Grande do Sul, Instituto de Geociências, Centro de Estudos de Geologia Costeira e Oceânica, 1996.

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Continental shelf. Manchester, UK: Carcanet, 2009.

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Walker, Pam. The continental shelf. New York: Facts on file, 2005.

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Narayanan, Savithri. Continental shelf wave propagation on the Labrador Shelf. St. John's, Nfld: Science Branch, Dept. of Fisheries and Oceans, 1989.

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Easton, Grave. The screamplay--continental shelf life. [Oak Bluffs, Mass.?]: Longlast Music BMI, 1990.

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United States. Minerals Management Service, ed. Outer Continental Shelf: Marine minerals. [Washington, D.C.?]: U.S. Dept. of the Interior, Minerals Management Service, 1992.

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H, Postma, and Zijlstra Jenne J, eds. Continental shelves. Amsterdam: Elsevier, 1988.

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Book chapters on the topic "Morphology of the continental shelf"

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Wright, L. D. "Recent Advances in Understanding Continental Shelf Sediment Transport." In Sediments, Morphology and Sedimentary Processes on Continental Shelves, 159–72. Chichester, West Sussex, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118311172.ch8.

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Clarke, John E. Hughes. "Optimal Use of Multibeam Technology in the Study of Shelf Morphodynamics." In Sediments, Morphology and Sedimentary Processes on Continental Shelves, 1–28. Chichester, West Sussex, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118311172.ch1.

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Li, Michael Z., Edward L. King, and Robert H. Prescott. "Seabed Disturbance and Bedform Distribution and Mobility on the Storm-Dominated Sable Island Bank, Scotian Shelf." In Sediments, Morphology and Sedimentary Processes on Continental Shelves, 197–227. Chichester, West Sussex, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118311172.ch10.

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Barrie, J. Vaughn, and Kim W. Conway. "Palaeogeographic Reconstruction of Hecate Strait British Columbia: Changing Sea Levels and Sedimentary Processes Reshape a Glaciated Shelf." In Sediments, Morphology and Sedimentary Processes on Continental Shelves, 29–46. Chichester, West Sussex, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118311172.ch2.

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Ten Brink, Uri S., Christopher Schneider, and Aaron H. Johnson. "Morphology and Stratal Geometry of the Antarctic Continental Shelf: Insights from Models." In Geology and Seismic Stratigraphy of the Antarctic Margin, 1–24. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/ar068p0001.

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Flemming, Burghard W., and Alexander Bartholomä. "Temporal Variability, Migration Rates and Preservation Potential of Subaqueous Dune Fields Generated in the Agulhas Current on the Southeast African Continental Shelf." In Sediments, Morphology and Sedimentary Processes on Continental Shelves, 229–47. Chichester, West Sussex, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118311172.ch11.

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García-García, A., T. Schoolmeester, D. Orange, A. Calafat, J. Fabres, E. Grossman, M. Field, T. D. Lorenson, M. Levey, and M. Sansoucy. "Recent Sedimentary Processes in the Cap de Creus Canyon Head and Adjacent Continental Shelf, NE Spain: Evidence from Multibeam Bathymetry, Sub-Bottom Profiles and Coring." In Sediments, Morphology and Sedimentary Processes on Continental Shelves, 71–97. Chichester, West Sussex, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118311172.ch4.

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Goff, John A., and Laurie Schuur Duncan. "Re-Examination of Sand Ridges on the Middle and Outer New Jersey Shelf Based on Combined Analysis of Multibeam Bathymetry and Backscatter, Seafloor Grab Samples and Chirp Seismic Data." In Sediments, Morphology and Sedimentary Processes on Continental Shelves, 121–42. Chichester, West Sussex, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118311172.ch6.

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Wood, Ray, Stuart A. Henrys, Vaughan Stagpoole, Bryan Davy, and Ian Wright. "Legal Continental Shelf." In Encyclopedia of Solid Earth Geophysics, 669–75. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-90-481-8702-7_221.

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Durán, Ruth, and Jorge Guillén. "Continental Shelf Landforms." In Submarine Geomorphology, 185–206. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57852-1_11.

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Conference papers on the topic "Morphology of the continental shelf"

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Skakun, Matthew G., Jillian M. Maloney, Shannon A. Klotsko, Amy E. Gusick, Loren Davis, Alexander Nyers, Todd J. Braje, and David Ball. "ASSESSING CONTROLS ON PALEODRAINAGE MORPHOLOGY ON THE CONTINENTAL SHELF OFFSHORE CENTRAL OREGON." In Joint 70th Annual Rocky Mountain GSA Section / 114th Annual Cordilleran GSA Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018rm-314016.

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Doolittle, Daniel, Eric Swanson, Craig Scherschel, Eugene Revelas, Kathryn Rovang, and Stephen Varnell. "Integrated and Adaptable Approach to Mapping Benthic Habitats to Support Offshore Wind Development off the Mid-Atlantic Outer Continental Shelf." In Offshore Technology Conference. OTC, 2023. http://dx.doi.org/10.4043/32390-ms.

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Abstract Offshore wind developers obtain extensive geophysical, geotechnical, and habitat data during Site Characterization activities. Integration and delivery of this information to a diverse group of stakeholders and Government agencies is required. We present an integrated benthic habitat mapping approach tailored to regional geology and ground conditions and discuss how various data was utilized to deliver multiple components of the permitting process. Multiple data sets were integrated and presented via a web-based GIS platform to aid delivery, visualization, and communication. Our unified approach to benthic habitat mapping and delivery of products to stakeholders was instrumental in successfully coalescing multiple performers to develop their individual deliverables in a cohesive and rapid manner. This approach reduced risk to schedule and budget, without sacrificing data density or quality. Four annual (2019–2022) benthic surveys were acquired to support Site Characterization and subsequent permitting processes. High-Resolution Geophysical data were collected concomitantly with the 2020 benthic survey data and used to refine subsequent 2021 and 2022 benthic survey designs. Benthic survey data consisted of grab sample tests (grain size), macrofaunal taxonomy, sediment profile and plan view imagery (SPI-PV), video imagery from each grab station, and towed video transects. Acoustic data products were processed and interpreted to create polygons of seafloor sediment coverage over the ASOW study area and ground-truthed with physical sampling, video, and digital still imagery to refine and validate acoustic data into a mappable model of essential fish and benthic habitats. Seafloor morphology and seabed sediment interpretations were coalesced into a benthic habitat model that displayed substrates consisting mostly of mobile sand sheets, with interspersed areas of gravelly sand and discrete patches of gravel. Overlying the substrate model was a range of benthic features and morphologies, including sand ridges, sand waves, megaripples, ripples, areas of depressional marks, hummocky seafloor, interbedded surficial sediments, irregular seafloor, and localized relief features. From these data, classified maps of Coastal Marine Ecological Standard (CMECS) substrates and fish habitats were made. Additional CMECS classification of benthic biotic components were mapped, showing the taxonomic communities that are present in each substrate. Seabed sediment modeling and morphological trends were dynamically studied and compiled into an interpreted and GIS-friendly dataset that enabled rapid online transfer to subject matter experts tasked with quantifying the benthic ecosystem across the development area. The methods and modeling that were produced by expert refinement of geophysical data to reflect the physically observed habitat structures allowed for dynamic minimum mapping unit variability while also isolating and identifying key areas of interest for benthic researchers and regulators. This mapping process led to an efficient and unified approach for all teams, saving project time and expense.
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Ward, L., Z. McAvoy, G. Masetti, and R. Morrison. "HIGH RESOLUTION MAPPING OF MORPHOLOGIC FEATURES AND SEAFLOOR SEDIMENTS OF THE NEW HAMPSHIRE AND VICINITY CONTINENTAL SHELF, WESTERN GULF OF MAINE." In 54th Annual GSA Northeastern Section Meeting - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019ne-328549.

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Rocha Vargas, Luis Alejandro, and Carlos Andres Izurieta. "Integration of Neural Networks and Wellbore Stability, a Modern Approach to Recognize Drilling Problems Through Computer Vision." In SPE Middle East Oil & Gas Show and Conference. SPE, 2021. http://dx.doi.org/10.2118/204760-ms.

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Abstract Cavings are a valuable source of information when drilling operations are being performed, and multiple parameters can contribute to producing cavings which indicate that failure has occurred or is about to occur downhole. This study will describe a project which is an integrated study of Machine Learning, Computer Vision, Geology, and Photography so that the recognition of cavings in the shaker is possible and how to link the cavings morphology with causal mechanisms related to wellbore instability problems. This study aims to develop a model which can extract caving features such as Shape, Edge Definition, Color, and Size. One of the core aspects of this study was to develop a structured image database of cavings from the Norwegian Continental Shelf which contains important feature information and the application of different algorithms used for automation enabled several opportunities to analyze and identify causal mechanism related to wellbore instability problems in real-time. As a result of that, the drilling operations would experience an improvement in terms of a faster decision-making process to solve operative problems related to wellbore stability which will lead to optimization not only in time and resources but also in safer drilling operations. Different algorithms and artificial intelligence tools were used to investigate the best approach to correctly detect and derive meaningful information about the shape, color size and edge from cavings like supervised learning, unsupervised learning, neural networks and computer vision. A key part of this study was image augmentation which plays a significant role for the detection of the cavings and their features. Multiple data sets can be created, and by using data augmentation, this will enable recognition of more complex patterns that will have on-rig applicability. Also, this new approach can deliver multiple outcomes besides failure mechanism identification such as volume of rocks being drilled, transport of cutting, type of formation being drilled.
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Torres*, Luiz Carlos, Ana Angélica Ligiero Alberoni, Izabel King Jeck, Angela Alonso Rangel, Helio Heringer Villena, and Marcus Aguiar Gorini. "The Brazilian Northern Continental Margin and its Continental Shelf Outer Limit." In 10th International Congress of the Brazilian Geophysical Society & EXPOGEF 2007, Rio de Janeiro, Brazil, 19-23 November 2007. Society of Exploration Geophysicists and Brazilian Geophysical Society, 2007. http://dx.doi.org/10.1190/sbgf2007-177.

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Carlos Torres, Luiz, Angela Alonso Rangel, Helio Heringer Villena, Marcus Aguiar Gorini, Ana Angélica Ligiero Alberoni, and Izabel King Jeck. "The Brazilian Northern Continental Margin and its Continental Shelf Outer Limit." In 10th International Congress of the Brazilian Geophysical Society. European Association of Geoscientists & Engineers, 2007. http://dx.doi.org/10.3997/2214-4609-pdb.172.sbgf0175_07.

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E. Ghidella, M., C. M. Paterlini, L. C. Kovacs, and G. A. Rodriguez. "Magnetic Anomalies on the Argentine Continental Shelf." In 4th International Congress of the Brazilian Geophysical Society. European Association of Geoscientists & Engineers, 1995. http://dx.doi.org/10.3997/2214-4609-pdb.313.87.

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Beels, C., J. De Rouck, H. Verhaeghe, J. Geeraerts, and G. Dumon. "Wave energy on the Belgian Continental Shelf." In OCEANS 2007 - Europe. IEEE, 2007. http://dx.doi.org/10.1109/oceanse.2007.4302228.

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Hale, D. "The Outer Continental Shelf Environmental Assessment Program." In OCEANS '86. IEEE, 1986. http://dx.doi.org/10.1109/oceans.1986.1160324.

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Danenberger, E. P. "Outer Continental Shelf Drilling Blowouts, 1971-1991." In Offshore Technology Conference. Offshore Technology Conference, 1993. http://dx.doi.org/10.4043/7248-ms.

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Reports on the topic "Morphology of the continental shelf"

1

Ward, Larry, Zachary McAvoy, Maxlimer Coromoto Vallee-Anziani, and Rachel Morrison. Surficial Geology of the Continental Shelf off New Hampshire: Morphologic Features and Surficial Sediment. University of New Hampshire Libraries, 2021. http://dx.doi.org/10.34051/p/2021.31.

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Ward, L., Z. McAvoy, and E. Nagel. Mapping of the major morphologic features and seafloor sediments of the New Hampshire Continental Shelf using the Coastal and Marine Ecologic Classification Standard (CMECS). Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/305940.

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Hobson, G. D., and J. Voyce. Polar Continental Shelf Project. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1987. http://dx.doi.org/10.4095/295639.

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Menzel, D. Coordination: Southeast continental shelf studies. Office of Scientific and Technical Information (OSTI), January 1989. http://dx.doi.org/10.2172/7244051.

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Sankeralli, L., and G. B. J. Fader. The morphology of the eastern Scotian Shelf. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1999. http://dx.doi.org/10.4095/210582.

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Makris, Nicholas C. Acoustic Clutter in Continental Shelf Environments. Fort Belvoir, VA: Defense Technical Information Center, September 2006. http://dx.doi.org/10.21236/ada611932.

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Makris, Nicholas C. Acoustic Clutter in Continental Shelf Environments. Fort Belvoir, VA: Defense Technical Information Center, September 2008. http://dx.doi.org/10.21236/ada533225.

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Makris, Nicholas C. Acoustic Clutter in Continental Shelf Environments. Fort Belvoir, VA: Defense Technical Information Center, September 2005. http://dx.doi.org/10.21236/ada572803.

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Makris, Nicholas C. Acoustic Clutter in Continental Shelf Environments. Fort Belvoir, VA: Defense Technical Information Center, September 2007. http://dx.doi.org/10.21236/ada573117.

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Dietrich, J. R., and J. Dixon. Geology of the Beaufort Sea continental shelf. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1997. http://dx.doi.org/10.4095/208898.

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