Factors

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Factors Affecting Height And Time Of The Bore

(in addition to height and time of high water at Sharpness)


Bore height INCREASED by

    i. Strong west to south-west winds

    ii. About 0.75 metres of freshwater below Gloucester

    iii. Channels of estuary well scoured

    iv. Low barometer


Bore height DECREASED by

    i. Strong north to east winds

    ii. Absence of freshwater

    iii. Too much freshwater

    iv. High barometer


Bore made EARLIER by

    i. Strong west to south-west winds

    ii. Up to 15 metres of freshwater

    iii. Channels cutting shorter routes through estuary sands

    iv. Channels well scoured

    v. Low barometer


Bore made LATER by

    i. Strong north to east winds

    ii. Absence of freshwater

    iii. Channels cutting longer routes through estuary sands

    iv. Channels unscoured, with high beds

    v. High barometer


    Note: The strength and direction of the wind out at sea is often of more consequence than prevailing local wind conditions.



Factors