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Glossary

Term Description
EA Environment Agency
Ebb Period when tide level is falling.
Ebb-tidal delta Sediment deposited on the seaward side of a tidal inlet.
EC European Commission
EEC European Economic Community
EFCI Estuarine Fish Community Index
Effective Record Length Total record length multiplied by the data capture rate.
Effluent A complex waste material (eg liquid industrial discharge or sewage) that may be discharged into the environment.
EGA Expert Geomorphological Assessment
Electromagnetic Current Meter A device which measures current and water pressure variations. If deployed in shallow water current and pressure data can be converted to wave height, period and direction.
Embayment Sea area within a concave shoreline plan shape.
EN English Nature
Epoch A geological time unit.
Equatorial tides Tides occurring semi-monthly as a result of the Moon being over the Equator. At these times the tendency of the Moon to produce a diurnal inequality in the tide is at a minimum.
Equilibrium Balance of forces or state which is maintained over time
Erosion The removal of sediment from the seabed by water movement resulting in a lowering of bed levels The landward retreat of a shoreline due to this process.
Estuaries Semi-enclosed coastal bodies of water which has a free connection to the open sea and where freshwater mixes with saltwater
Estuarine Of estuaries.
Estuary A semi-enclosed coastal body of water which has a free connection to the open sea and where freshwater mixes with saltwater
EU European Union
Eulerian Observation of flow field from a fixed point of reference (e.g. using a fixed position current meter).
Euphotic zone Surface waters to a depth of approximately 80-100 m; the lit region that extends virtually from the water surface to the level at which photosynthesis fails to occur because of reduced light penetration.
Eutrophication Enrichment of waters with nutrients, primarily phosphorus, causing abundant aquatic plant growth. Frequently resulting in oxygen depletion below the surface layer of a water body.
Exponential Mathematical function defined as the limiting value of (1 + 1/m)m as m approaches infinity, e = 2.718.
Extreme The value expected to be exceeded one, on average, in a given (long) period of time.
Extreme high water The highest elevation reached by the sea as recorded by a tide gauge during a given period.
Extreme low water The lowest elevation reached by the sea as recorded by a tide gauge during a given period.

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Last Modified on: 19 June 2011
Printed from the Estuary Guide on 26/08/2019 03:32:59