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1957•Quarterly Journal of the Royal Meteorological SocietyRequires access

Seiches in lough neagh

Jack Darbyshire, Mollie Darbyshire

Open publisher page 11 citations

Abstract

Abstract Records of seiches in Lough Neagh during April 1949 were investigated. Fourier analysis of the records indicated three period bands centred round 1.6 hr, 1.15 hr, and 0.75 hr. The two longer periods appeared to have a nodal line across the centre of the lake, parallel to the shorter sides. Methods of deriving these periods in terms of the shape of the lake basin are discussed. The amplitudes of the seiches were compared with the wind records and a high degree of correlation was obtained between the amplitude and Wdθ/dt, where W is the wind speed and dθ/dt is the rate of change of wind direction. An estimate was made of the coefficient of damping of the seiche amplitude and it was found to correspond to a decay to half value in 10 hr.

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What this paper is about

Abstract Records of seiches in Lough Neagh during April 1949 were investigated. Fourier analysis of the records indicated three period bands centred round 1.6 hr, 1.15 hr, and 0.75 hr. The two longer periods appeared to have a nodal line across the centre of the lake, parallel to the shorter sides. Methods of deriving these periods in terms of the shape of the lake basin are discussed. The amplitudes of the seiches were compared with the wind records and a high degree of correlation was obtained between the amplitude and Wdθ/dt, where W is the wind speed and dθ/dt is the rate of change of wind direction. An estimate was made of the coefficient of damping of the seiche amplitude and it was found to correspond to a decay to half value in 10 hr.

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Available abstract

Abstract Records of seiches in Lough Neagh during April 1949 were investigated. Fourier analysis of the records indicated three period bands centred round 1.6 hr, 1.15 hr, and 0.75 hr. The two longer periods appeared to have a nodal line across the centre of the lake, parallel to the shorter sides. Methods of deriving these periods in terms of the shape of the lake basin are discussed. The amplitudes of the seiches were compared with the wind records and a high degree of correlation was obtained between the amplitude and Wdθ/dt, where W is the wind speed and dθ/dt is the rate of change of wind direction. An estimate was made of the coefficient of damping of the seiche amplitude and it was found to correspond to a decay to half value in 10 hr.

Key concepts: Seiche, Amplitude, Wind speed, Structural basin, Geology, Geodesy, Environmental science, Meteorology

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