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 programs LZKAF and NCANALYSE.
Definitions for the Characteristic Numbers
Program NCANALYSE
Maximum Wind Speed
Highest (local) value of wind speed within the period of data analysis.
Data analysis: NCANALYSE.
Time of Maximum Wind Speed
Difference in time between local time of max. wind speed and the max. wind speed at a reference station.
Data analysis: NCANALYSE.
Residual Wind Speed
Residual value of wind speed (computed from addition of vectors) within the period of data analysis.
Data analysis: NCANALYSE.
Mean Magnitude of Wind Speed
Mean magnitude of wind speed within the period of data analysis.
Data analysis: NCANALYSE.
Standard Deviation of Wind Speed
Standard deviation of wind speed within the period of data analysis.
Data analysis: NCANALYSE.
Variance of Wind Speed
Variance of wind speed within the period of data analysis.
Data analysis: NCANALYSE.
Duration of High Wind Speed
Period of the time during which local wind speed lies above a given wind speed limit.
Data analysis: NCANALYSE.
Duration of Low Wind Speed
Period of the time during which local wind speed lies below a given wind speed limit.
Data analysis: NCANALYSE.
Relative Frequency Distribution of Wind Speed
Relative frequency of wind speed within given velocity intervals.
Data analysis: NCANALYSE.
Cumulative Frequency Distribution of Wind Speed
Cumulative frequency of wind speed within given velocity intervals.
Data analysis: NCANALYSE.
Exceedance Frequency of Wind Speed Limits
Exceedance frequency of wind speed limits within the period of data analysis.
Data analysis: NCANALYSE.
Underflow Frequency of Wind Speed Limits
Underflow frequency of wind speed limits within the period of data analysis.
Data analysis: NCANALYSE.
Quantiles of Wind Speed
Wind speed out of a time series which is not exceeded of a certain percentage of present wind speed values.
Data analysis: NCANALYSE.
Program LZKAF
Maximum Wind Speed
Highest value of (local) wind speed within the period of data analysis
Example: Maximum Wind Velocity in the North Sea
Time of Maximum Wind Speed
Difference in time between local time of max. wind speed and the max. wind speed at a reference station.
Example: Time of Maximum Wind Velocity in the North Sea
Duration of High Wind Speed
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 Speed
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 Speed
Frequency distribution of local wind speed within arbitrary given intervals and sectors of wind direction
Example: Frequency Distribution of Wind Velocity in the North Sea
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