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TECHNICAL ARTICLES
| Published in issue No 118, October
2005 of The Hydrographic Journal |
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TIDE-WATCHING, CUBATURE AND FRICTION IN THE MENAI
STRAIT
Dr Ken George*, School of Ocean Sciences, University of Wales Bangor, Menai
Bridge, Anglesey, Wales
* This research was carried out while on sabbatical leave from the
University of Plymouth
Abstract
Measurements of tidal height for one semi-diurnal tidal cycle were made at nine
locations in the Menai Strait in north Wales. The results were reduced to mean
spring tides. The method of cubature was used to determine the discharges
throughout the Strait. The one-dimensional equation of motion, integrated over a
reach, was used to evaluate the frictional term. By computing the conveyance as
a function of height by two different methods, an estimate was made of the
coefficient of friction in different parts of the Strait. It was found that
Manning’s n gave a better representation of the friction than other
coefficients.
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