Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.793628
Title: Hydrodynamic modelling of sediment transport and bedform formation on the NW Irish shelf
Author: Evans, William
ISNI:       0000 0004 8503 4882
Awarding Body: Ulster University
Current Institution: Ulster University
Date of Award: 2018
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Abstract:
Much of our knowledge of sediment transport on the northwest Irish shelf was hypothesised in the 1970's with limited resources and without the benefit of modern seafloor mapping equipment and techniques (Kenyon and Stride, 1970). Utilising existing and newly generated data sets, this research focuses on modern sediments located on the north Irish shelf between 54° - 56°N the aim of which is to establish connections between bedform morphology, sediment distribution and modelled hydrodynamics in order to describe sediment transport processes from a shelf to bedform scale. Interrogation of multibeam echosounder data has enabled classification of 8 depositional and 2 erosional bedform types (Evans et al., 2015). Many of these bedforms overlap those glacial formations identified in previous research (Benetti et al., 2010b, Dunlop et all., 2011, O'Cofaigh et al., 2012). Classification of back scatter data has identified 5 sedimentary classes across the shelf, with gravel dominating the inshore areas and large soft sediment deposits concentrated in proximity to moraine features and areas of bathymetric lows. These mapping techniques applied alongside outputs from a sediment transport specific, hydrodynamic model created as part of this research, have led to a number of novel findings and challenges to existing research. The location of bedload parting zones presented by (Belderson et al., 1982) are challenged and a new location suggested based on bedform distribution, bedform geometry and modelled current data.
Supervisor: Jackson, Derek ; Benetti, Sara Sponsor: Department of Education and Learning
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.793628  DOI: Not available
Keywords: Sediment ; Multibeam Echosounder ; Hydrodynamics ; Seafloor mapping
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