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Glossary

Term Description
Pathogen An organism capable of eliciting disease symptoms in another organism.
PCA Principal Components Analysis
Peak Hmax Highest maximum wave height recorded during a storm event.
Peak Hsig Highest significant wave height recorded during a storm event.
Peak Wave Power Maximum wave power level recorded during a storm event.
Pebbles Beach material usually well-rounded and between about 4 mm to 75 mm in diameter.
Pelagic Term applied to organisms of the plankton and nekton which inhabit the open water of a sea or lake.
Pelagic Animal life that is found in the water column (fish, zooplankton, etc)
Percentage Exceedance Percentage of time that a given value is exceeded.
Percentage Occurrence Percentage of time that given value (or range of values) occurs.
Perigean tides or tidal currents Tides of increased range or tidal currents of increased speed occurring monthly as the result of the Moon being in perigee.
Perigee The point in the orbit of the Moon or man-made satellite nearest to the Earth. The point in the orbit of a satellite nearest to its companion body.
Perihelion The point in the orbit of the Earth (or other planet, etc.) nearest to the Sun.
pH Value taken to represent the acidity or alkalinity of an aqueous solution. It is defined as the negative logarithm of the hydrogen ion acidity of the solution.
Photosynthesis The conversion of carbon dioxide to carbohydrates in the presence of chlorophyll using light energy. General equation:

CO2 + 2H2O => (CH2O) + O2 + H2O
Physical models Refers to the investigation of coastal processes using a scaled model.
PLA Port of London Authority
Pleistocene The geological period extending from around two million years to 10,000 years before present, characterised by glacial and interglacial periods.
Plunging Waves The wave crest breaks suddenly and with tremendous force by curling over a near vertical wave face.
Pocket beach A beach, usually small, between two headlands.
Pressure Sensor A pressure transducer sensing device for water level measurement.
Progradation An extension of a coastal landform by sedimentation.

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Last Modified on: 19 June 2011
Printed from the Estuary Guide on 26/08/2019 03:31:44