Question

Q3. (a) Define the terms: i) Tidal range (ii) Diurnal inequality (ii) Amphidromic point (iv) Tidal diamond (4 marks) (b) The table below (Table Q3) summarises the primary harmonic tidal constituents at a harbour. Use this information to classify the form of the tidal curve at the harbour in terms of the tidal ratio, F. Estimate the mean spring tidal range and the mean low water spring level relative to the local datum. Period Amplitude Harmonic (hours) (cms) 12.42 S2 1 2.00 23.93 70 25.83 210 Table Q3:Primary harmonic tidal constituents at a harbour. (3 marks)

Answer 1

- Answer 3 R (is Tidalrange > Tidal gange is the height disorence between ligh tide and low tide. Tides are the rise and sale of Sea levels caused by Gravitation as forces Exerted by the moon and sun and the. rotation of Earth. lal range is not constant but changes depending on the locations of the. Moon and sun. I (ii) Diurnal inequality → The variation in Height that is oken observed between adjacent high waters and low waters is that oceanographers Call the Diurnal inequality. this is the phenomenon caused by the tilt of the Earth in relation to the tift tilt of the moon orbital plane (ii) Amphidromic point - it is a Geographical location which has. zero tidtat tidal amplitude sor one. harmonic constituent of the tide. - it is also called a tidcal node. riv Tidat Tidae Diamonde - it indicat the direction and speed of tidal stream. - Tidal diamond are symbol on British I admiratly charts

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