Masters Degrees (Civil Engineering)

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Browsing Masters Degrees (Civil Engineering) by Author "Attwood, Arthur Craig"

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    The measurement of forces exerted on submarine pipelines by breaking waves
    (Stellenbosch : Stellenbosch University, 1993) Attwood, Arthur Craig; Rossouw, J.; Stellenbosch University. Faculty of Engineeiring. Department of Civil Engineering.
    ENGLISH ABSTRACT: The aim of this thesis was to measure the forces due to breaking waves on a pipeline, raiseJ a small d·,stance above the sea-bed, in a physical model. The main purpose was rn construct a system which could reliably and accurately measure these forcl!s . Preliminary tests were then canied out, using this system, to determine whetier there is a sudden increase in the forces as the pipeline is moved from just sea-ward of the breaker zone, into the breaker zone. A literature study indicated that a factor of 2 to 3 should be allowed, for the increase in the forces under breaking waves, when compared to the forces under non-breaking waves of the same height and period. Because of the possibility of these breaking waves imparting an impact force to the measuring system, a major part of the study was devoted to the development of a measuring system with a high frequency response, which would be able to respond to these high pressure forces of short duration Due to the time limitation, only exploratory tests on the forces under breaking waves could be carried out. These tests were carried out in the 1 m. wide by 40 m long wave flume of the University of Stellenbosch. Only the case of tl1e pipeline parallel to the wave crests was investigated.