View source for Characteristic Numbers of Meteorological Data (independent of tides)

[[de: Kennwerte meteorologischer Größen]]
[[category:Characteristic Numbers (independent of the presence of tides)]]
[http://www.baw.de/downloads/wasserbau/mathematische_verfahren/pre_postpr/pdf/lzkaf-de.pdf Graphical representation] of various characteristic numbers of meteorological data (with German text only). This graphical representation is also available in [http://www.baw.de/downloads/wasserbau/mathematische_verfahren/pre_postpr/eps/lzkaf-de1.eps 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]].<br />
<!-- [[Example figure: maximum wind speed]]. <br /> -->
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.<br />
<!-- [[Example figure: time of maximum wind speed]]. <br /> -->
Data analysis: [[NCANALYSE]].

====Residual Wind Speed====
Residual value of wind speed (computed from addition of vectors) within the [[period of data analysis]].<br />
<!-- [[Example figure: residual wind speed]]. <br /> -->
Data analysis: [[NCANALYSE]].

====Mean Magnitude of Wind Speed====
Mean magnitude of wind speed within the [[period of data analysis]].<br />
<!-- [[Example figure: mean magnitude of wind speed]]. <br /> -->
Data analysis: [[NCANALYSE]].

====Standard Deviation of Wind Speed====
Standard deviation of wind speed within the [[period of data analysis]].<br />
<!-- [[Example figure: standard deviation of wind speed]]. <br /> -->
Data analysis: [[NCANALYSE]].

====Variance of Wind Speed====
Variance of wind speed within the [[period of data analysis]].<br />
<!-- [[Example figure: variance of wind speed]]. <br /> -->
Data analysis: [[NCANALYSE]].

====Duration of High Wind Speed====
Period of the time during which local wind speed lies above a given wind speed limit.<br />
<!-- [[Example figures: duration of high wind speed]]. <br /> -->
Data analysis: [[NCANALYSE]].

====Duration of Low Wind Speed====
Period of the time during which local wind speed lies below a given wind speed limit.<br />
<!-- [[Example figures: duration of low wind speed]]. <br /> -->
Data analysis: [[NCANALYSE]].

====Relative Frequency Distribution of Wind Speed====
Relative frequency of wind speed within given velocity intervals.<br />
<!-- [[Example figures: relative frequency distribution of wind speed]]. <br /> -->
Data analysis: [[NCANALYSE]].

====Cumulative Frequency Distribution of Wind Speed====
Cumulative frequency of wind speed within given velocity intervals.<br />
<!-- [[Example figures: cumulative frequency distribution of wind speed]]. <br /> -->
Data analysis: [[NCANALYSE]].

====Exceedance Frequency of Wind Speed Limits====
Exceedance frequency of wind speed limits within the [[period of data analysis]].<br />
<!-- [[Example figures: exceedance frequency of wind speed limits]]. <br /> -->
Data analysis: [[NCANALYSE]].

====Underflow Frequency of Wind Speed Limits====
Underflow frequency of wind speed limits within the [[period of data analysis]].<br />
<!-- [[Example figures: underflow frequency of wind speed limits]]. <br /> -->
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. <br />
<!-- * a) [[Example figures: median of wind speed Q_0.50]] -->
<!-- * b) [[Example figures: quantiles of wind speed Q 0.01, Q 0.05, Q 0.95, Q 0.99]] -->
Data analysis: [[NCANALYSE]].

===Program [[LZKAF]]===

====Maximum Wind Speed====
Highest value of (local) wind speed within the [[period of data analysis]]<br />
[[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.<br />
[[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<br />
[[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<br />
[[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<br />
[[Example: Frequency Distribution of Wind Velocity in the North Sea ]]

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