Inventory of Dutch datasets for extreme value analyses

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Inventory of Dutch datasets for extreme value analyses

Authors: Madelon Burgmeijer and Pieter van Gelder (TU Delft) Version: Febr. 22, 2005

Data set 1: Storm surge levels

http://www.hydraulicengineering.tudelft.nl/public/gelder/paper56-data3.zip

Harl.asc, Delf.asc Held.asc Hoek.asc,Vlis.asc.

Data information

Variables: Peaks over treshold values of storm surge levels at 5 locations along the Dutch coast

Series length: winters from 1932 through 1985 during storm season October 1 through March 15.

English translation of the instruction at the beginning of the file: * Name of place winters 1932 through 1985 * Daan S4-selection of wind setup (minimum 30 cm) *Storm season october 1 through march 15

* consecutive date (YYYYMMDD), time (HHMM, in MET),

* high tide in cm +NAP, level corrected for 1985 in cm+NAP, wind set up in cm. * with correction according to indication GWIA-88.236

* selection originally used by CWI

Metadata information

Geographic characteristics:

Survey location NB OL

Harlingen 53°10'14'' 5°25'55''

Hoek van Holland 51°59' 4°07'

Den Helder 52°58' 4°46'

Delfzijl 53°19'54'' 6°55'05''

Vlissingen 51°27' 3°35'

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Data set 2: wave climate parameters

http://www.hydraulicengineering.tudelft.nl/public/gelder/golfklimaat.zi p

Variables: Hm0, H1/3,HTE3, Tm02, TH1/3, Th0, wind direction, wind speed, water level , surge

Series length:

The period over which the wave climate parameters are available is: 1 January 1979- 31 December 2001

At most of the locations, survey statistics are available from 1979 onwards. At the Euro platform and Scheur west, however, the statistics begin much later, as can be seen from the table below.

location beginning date ancillory sensor

beginning date main sensor K13a platform 18 jan 1979 21 mrt 1985 Schiermonnikoog

noord

24 nov 1979 13 apr 1989 Eierlandse Gat 13 sep 1979 17 apr 1989 IJmuiden munitie stortplaats 12 jan 1979 1 apr 1989 Noordwijk meetpost 1 jan 1979 20mrt1985 Euro platform 19 nov 1982 20mrt 1985 Lichteiland Goeree - 1 jan 1979 Schouwenbank - 1 jan 1979 Scheur west 1 jan 1985 1 jan1985

In compiling the measured sequences, those approved from the main sensor at each location are used. The disturbances in these sequences (failure, rejected) have been supplemented, where possible, with information from the ancillory sensor. For

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*Detailed information about the net measurement duration of the main sensor, the main sensor supplemented by the ancillory sensor and the estimates can be found at the website of "Wave climate": http://www.golfklimaat.nl/index.cfm?page=uitleg.periode

Extreme values:

In addition to wave climates, this website also pays some attention to extreme values for wave heights and wave periods. A statistical technique is presented, to estimate the distribution of these variables. See:

http://www.golfklimaat.nl/index.cfm?page=extremen

The following link provides the files (Hmo....mxm, Tmo2....mxm, Tpb....mxm) which include the peaks over treshold for a set of locations at the North Sea.

http://www.hydraulicengineering.tudelft.nl/public/gelder/paper56-data2.zip

Data information for these files:

Variables: Hmo, Tmo2 and Tpb(peak period) Series lenth: 1979 through 1993

Owner of the data: State Institute of Coast and Sea- The Hague

Sensors:

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Survey Location Main Sensor Period Ancillory Sensor

K13a platform wave-rider/wavec/ dir. wave-rider 1985-present waverider Schiermonnikoog noord wave-rider/wavec/ dir. wave-rider - -

Eierlandse Gat wave-rider/wavec/ dir. wave-rider - - IJmuiden munitie

stortplaats

wave-rider/wavec/dir. wave-rider

1989-present waverider Noordwijk meetpost step gauge/wavec/step gauge/radar 1985-1991 step gauge Euro platform step gauge/wavec/dir. wave-rider 1985-present step gauge/radar Lichteiland Goeree step gauge/radar - -

Schouwenbank wave-rider - - Scheur west wave-rider

1985-present wave-rider (Deurloo)

Geographic characteristics of the sampling zone: full name of station survey

network x y NB OL

m MSL

K13a platform Noordzee 10.176 583.334 53º13'04" 3º13'13" 30 Schiermonnikoog

noord

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Owner of the data is the department of Public Works, Transport and Water Management (ministerie van verkeer en waterstaat). The data were downloaded and are available via the website of dr. ir. P.H.A.J.M. van Gelder. The file format is .kls, they can be opened with Wordpad.

Dataset 3: River discharge data

Daily discharge data of over 200 West and Central European river stations is available at:

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The map shows the spatial distribution of the 213 flow gauges.

EXPLANATION OF DAILY RUNOFF DATAFILES A B C DE ________________________________________________________________________ __ CHINDWIN HKAMTI 334.00 9999.320.00305.00296.00292.00288.00276.00268.00264.00 1 11978 264.00256.00252.00248.00248.00244.00244.00240.00236.00236.00 2 11978 240.00240.00240.00232.00224.00216.00212.00208.00204.00200.00196.00 3 11978 196.00196.00192.00192.00192.00188.00184.00184.00184.00184.00 1 21978 180.00180.00176.00176.00168.00168.00164.00164.00160.00164.00 2 21978 168.00172.00168.00164.00164.00164.00160.00160.00 3 21978 152.00148.00144.00140.00136.00140.00140.00136.00148.00148.00 1 31978 156.00148.00140.00136.00124.00124.00120.00120.00112.00112.00 2 31978 108.00108.00104.00104.0099.00099.00097.00097.00096.00096.00097.000 3 31978 COMMENT:

A = Name of river (40 characters)

B = Name of station (40 characters max.)

C = Number of row (there are always 3 rows per month) D = Month

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The values are in m3/s. Data rows:

Each data row has a length of 80 characters + line-feed, where the year, month and number of row are right-bound. There are always three rows per month. The first 2 rows contain 10 flow-values; the third will differ from 8 to 11 values, depending on the count of days per month.

Each value consists of 6 characters. There maybe leading blanks.

Missing values will be marked with " 9999." or blanks (see 2nd Jan. 1978) As you may recognize, in the example above the data-rows are only 76 characters of length this is because of formatting as a print-file!

Example:

February 23rd, 1978 = 168.00

The data from different stations situated in one datafile are divided by their river- and stationname.

Variables: flow Q

Series length: The series lenths differ from a couple of years upto over 100 years. For example the data of river Rhein at station Rees cover a period from 1814 upto 1997. There's a gap from 1841 till 1854 and 1834 is missing.

Meta data information

The coordinates of all locations are available from:

http://www.hydraulicengineering.tudelft.nl/public/gelder/paper56-database-rivers.xls

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Data set 4: Wind climate

Data can be downloaded from:

http://www.knmi.nl/product/

Surf to the data sets via:

>klimatologische gegevens > choose "english" (under,left)

>Daily wheather of the Netherlands, data sets >Download time series

Variables: θ,v v v_d, _h, _g Series length:

Station Start End

Den Helder (De

Kooy) 1906 2005 De Bilt 1901 2005 Groningen (Eelde) 1906 2005 Twenthe 1951 2005 Vlissingen 1906 2005 Maastricht (Beek) 1906 2005 Metadata information

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Geographic coordinates of the stations:

Station Latitude Longitude Altitude of site (m)*

Den Helder (De

Kooy) 52°55'28" 4°47'07" 0.5 De Bilt 52°06'00" 5°11'00" 2.0 Groningen (Eelde) 53°07'30" 6°35'00" 3.5 Twenthe 52°16'23" 6°53'48" 34.5 Vlissingen 51°26'32" 3°35'46" 8.0 Maastricht (Beek) 50°54'57" 5°46'37" 114.0

Owner of the data is the ''Royal Netherlands Meteorological Institute'' These data can be used freely provided that this source is acknowledged. The data are available via the link, mentioned under "Data set 4"

The zipped files (83 kB) comprise at most 10 years of data in ASCII-format.

Data set 5: Potential wind speed

Data can be downloaded from:

http://www.knmi.nl/samenw/hydra/cgi-bin/meta_data.cgi

Variables: θ,u_p(hourly averaged potential wind speed)

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Roughness maps of the netherlands are available at

http://www.knmi.nl/samenw/hydra/roughness_map/index.html

Information about extreme wind statistics can be found at the following URL.

http://www.knmi.nl/samenw/hydra/documents/background/hydra_background.htm

* RMIZ made statistical analysis to get extreme windspeeds, frequency distribution tables and data from extreme storms in the period 1962-2002. See:

http://www.knmi.nl/samenw/hydra/index.html

Warning: because of relocation of stations and changes in measuring techniques these time series may contain inhomogeneities.

Geographic coordinates of the stations and a graphical presentation next:

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Owner of the data is the ''Royal Netherlands Meteorological Institute'' These data can be used freely provided that this source is acknowledged. The data are available via the link, mentioned under "Data set 5"