Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.474032
Title: The hydrography, circulation and sediment movements of the Ythan Estuary
Author: Stove, G. Colin
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 1978
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Abstract:
This thesis attempts to combine detailed methods of 'surveying and analysis of a dynamic geomorphologioal form, an estuary, with the analysis of precise hydrographic and sedimentological processes operating on this entity. The Ythan Estuary, was chosen for this study because, of its compact size and the existence of a considerable research programme. by other disciplines in this area at Aberdeen University. At the more general level there, also appears to be a need for this type of quantitative study for coastal planners and engineers. The detailed surveying of this entire estuary both above and below the mean low water mark, a considerable task In its own right, was successfully completed by photogrammetric, topographic and hydrographic methods; thus providing a series of detailed descriptive maps and other quantitative information on the Ythan Estuary over a fixed study period. These precise topographic, bathymetric and sedimentological maps so produced, thus provide a valuable data base for further research workers. Remote sensing techniques ware used to discover a major incised channel, down to -40 metres ODN and relict estuarine shorelines at -9 and -20 metres ODN respectively. This adds considerable palaeo-morphological evidence for the study of recent Quaternary events in the area and, in particular forms a stratigraphic baseline for the, longer-term evaluation of sedimentation processes. A considerable amount of original field data on physical estuarine processes operating during tidal cycles was obtained from mi integrated series of field experiments, The analysis of this data and, subsequently, the statistical testing of the significance of the results form the second main aim of this thesis. As a result, of new methods of tidal analysis, a simpler approach, of, some value to physical planners, coastal engineers and geomorphologists, has been obtained to replace the complex mathematical, approach of traditional tidal theory. This method, using spectral analysis techniques, has some bearing on the prediction of storm-surge effects on this coastline. During the study period, the dynamic balance (net residual tidal circulation), the salt balance and the suspended sediment balance of the entire estuary was computed. Results obtained indicate a condition of net sediment accumulation in the estuary from a primary marine-based and secondary aeolian-based source. From these results a now and more exact method of computing the estuarine flushing rate is developed Original sedimentological field experiments conducted during peak tidal conditions and average river discharge conditions, led to the development of a new method of evaluating estuarine sedimentation. The thesis is thus a comprehensive geographical investigation of a particular estuarine system and is an intrinsic contribution to the scientific study of the Ythan Estuary Moreover, the thesis also includes several new techniques and methods which are considered to have general application for similar estuarine studies elsewhere.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.474032  DOI: Not available
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