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Tidal Characteristic Numbers of Potential Energy Anomaly

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Motivation

The calculation as well as the graphic visualization of various tidal characteristic numbers of potential energy anomaly (PEA) contributes to an improved understanding of the vertical density stratification in areas like coastal seas and estuaries.

Automatic analyses for all of the above mentioned tidal characteristic numbers of PEA are carried out for 2D-data by the programs NCANALYSE (mode TDKS).

Periods of analysis:

  • mode TDKA
    • flood current: period between ebb slack (or start of flooding) and flood slack;
    • ebb current: period between flood slack and ebb slack (or end of flooding);
    • tide: period between first ebb slack (or start of flooding) and second ebb slack (or end of flooding).

Definitions for the Tidal Characteristic Numbers of PEA

Flood Current

Mean PEA Flood Current

Mean value of PEA during the flood current duration of a tide.

Maximum PEA Flood Current

Maximum value of PEA during the flood current duration of a tide.

Minimum PEA Flood Current

Minimum value of PEA during the flood current duration of a tide.

Ebb Current

Mean PEA Ebb Current

Mean value of PEA during the ebb current duration of a tide.

Maximum PEA Ebb Current

Maximum value of PEA during the ebb current duration of a tide.

Minimum PEA Ebb Current

Minimum value of PEA during the ebb current duration of a tide.

Tidal Cycle (between two subsequent ebb slacks)

Mean PEA

average value of PEA during a complete tidal cycle (period between two subsequent slack water times of ebb current).

Maximum PEA

maximum value of PEA during a complete tidal cycle (period between two subsequent slack water times of ebb current).

Minimum PEA

minimum value of PEA during a complete tidal cycle (period between two subsequent slack water times of ebb current).

Tidal Variation of PEA

difference between the extreme values of PEA during a complete tidal cycle (period between two subsequent slack water times of ebb current).

Quantiles

For all quantities mentioned above also quantiles can be optionally computed.

Literature

G. J. de Boer et al (2008) Using the potential energy anomaly equation to investigate tidal straining and advection of stratification in a region of freshwater influence, Ocean Modelling 22(1-2):1-1,
DOI https://doi.org/10.1016/j.ocemod.2007.12.003


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