Characteristic Numbers of Meteorological Data (independent of tides)
From BAWiki
Graphical representation of various characteristic numbers of meteorological data (with German text only). This graphical representation is also available in Encapsulated PostScript format
Motivation
Knowledge of spatial as well as temporal variations of wind velocity and direction in coastal areas and estuaries is a prerequisite for any proper (numerical) simulation of water level and current velocity for wind-influenced tides and especially under storm surge conditions. For questions arising in coastal engineering work calculation of a few characteristic numbers for meteorological data may contribute to give better answers. Therefore derived quantities from e.g. synoptic wind field data help to characterize single as well as to distinguish between different wind situations.
An automatic analysis of all Characteristic Numbers of Meteorological Data is carried through by the computer program LZKAF.
Definitions for the Characteristic Numbers
Maximum Wind Velocity
Highest value of (local) wind velocity within the period of data analysis
Example: Maximum Wind Velocity in the North Sea
Time of Maximum Wind Velocity
Difference in time between local time of max. wind velocity and the max. wind velocity at a reference station.
Example: Time of Maximum Wind Velocity in the North Sea
Duration of High Wind Velocity
Period of the time during which local wind speed lies above a given thershold
Example: Duration of High Wind Velocity in the North Sea
Duration of low wind velocity: period of the time during which local wind speed lies below a given thershold
Example: Duration of Low Wind Velocity in the North Sea
Frequency Distribution of Wind Velocity
Frequency distribution of local wind speed within arbitrary given intervals and sectors of wind direction
[[:File:Nordsee94-dlowwind-nsc.png|Example: Frequency distribution of Wind Velocity in the North Sea
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