Wave statistics from Acajutla, El Salvador

The data set comprises wave height and period statistics, and sea level measurements collected near Acajutla, El Salvador. Accurate positions are not known and the location of both instruments is approximated as 13 deg 32.0 N, 89 deg 57.0 W. There is no other information available regarding these sites. The data were collected between 1 December 1974 and 30 November 1975 using an Institute of Oceanographic Sciences (IOS) frequency modulated (FM) pressure recorder deployed in the harbour at Acajutla and a waverider buoy deployed offshore from the harbour. The IOS FM pressure recorder uses a pressure sensitive diaphragm to vary the gap of a parallel plate capacitor, resulting in a frequency modulation of a nominal 100 KHz carrier signal. This signal is recorded on a shore-based magnetic tape data logger linked to the pressure unit by armoured cable. Data were recorded for ten minutes every three hours and analysed later as described by Hardcastle (1978). Some uncertainty surrounds the ability of the pressure recorder to respond accurately to the surface waves since the transfer function from pressure to surface wave height is incompletely understood. Draper (1957) has derived a factor to correct for the hydrodynamic attenuation of the pressure signal. This factor varies with mean zero up-crossing period and may increase wave heights by up to 15 percent compared with classical wave theory (Fortnum and Hardcastle, 1979). This data set has not been corrected. The waverider buoy generates a heave signal via an internal accelerometer to an accuracy of better than five percent. This signal is used to amplitude modulate a 27-30 MHz radio signal which is transmitted continuously and can be received by the recording device at a range of up to 50 km depending on local conditions (Driver, 1980). The data were collected by Livesey and Henderson (now incorporated with Binnie and Partners, 65 London Rd., Redhill, Surrey, RH1 1LG, UK) and are stored at the British Oceanographic Data Centre.

Simple

Alternate title

British Oceanographic Data Centre record 1048ACAJUTLA
Date (Publication)
2017-10-03
Date (Creation)
2010-10-19
Date (Revision)
2017-01-30
Citation identifier
http://www.bodc.ac.uk/ / EDMED4290
Point of contact
Organisation name Individual name Electronic mail address Role

Livesey & Henderson

Unknown

inapplicable

 		Originator

British Oceanographic Data Centre

enquiries@bodc.ac.uk

Custodian
Maintenance and update frequency
As needed

MEDIN metadata record availability

Vertical Coverages

SeaDataNet PDV

INSPIRE themes
Use limitation

Usage restrictions are specified in the terms of the licence
Access constraints
Restricted
Access constraints
Other restrictions
Other constraints

Data are freely available for use in teaching and research, providing due acknowledgment in any publication produced, following agreement to the terms and conditions of the British Oceanographic Data Centre Data Licence. The licence terms and conditions are available via https://www.bodc.ac.uk/data/documents/nodb/267795/

Language
English
Topic category
  • Oceans
  • Elevation
N
S
E
W
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Begin date
1974
End date
1975
Supplemental Information

Publication year: 1957-01-01

Publication title: Attenuation of sea waves with depth

Publication authors: L. Draper

Publication editors: La Houille Blanche, 12



Publication year: 1979-01-01

Publication title: Waves recorded at Aldeburgh, Dunwich and Southwold on the east coast of England

Publication authors: B.C.H. Fortnum & P.J. Hardcastle

Publication editors: Institute of Oceanographic Sciences, Report No. 65



Publication year: 1978-01-01

Publication title: Sea wave recording system using magnetic tape cassettes

Publication authors: P.J. Hardcastle

Publication editors: Institute of Oceanographic Sciences, Report No. 61



Publication year: 1980-01-01

Publication title: A guide to sea wave recording

Publication authors: J.S. Driver

Publication editors: Institute of Oceanographic Sciences, Report No. 103
Reference system identifier
OGP / urn:ogc:def:crs:EPSG::4326
Distribution format
    Distributor contact
    Organisation name Individual name Electronic mail address Role

    British Oceanographic Data Centre

    enquiries@bodc.ac.uk

    		Distributor
    OnLine resource
    Protocol Linkage Name
    https://www.bodc.ac.uk/data/bodc_database/nodb/

    BODC online data delivery service
    Hierarchy level
    Dataset
    Statement

    This dataset was created by the organisations with the "originator" role in this metadata record following their in-house data processing and quality control procedures. The data were then provided to the British Oceanographic Data Centre (BODC) for ingestion into one of the schemas of the National Oceanographic Database (NODB). During ingestion BODC undertake quality control, documentation and metadata enhancement procedures appropriate to the type of data. For an overview please see http://www.bodc.ac.uk/about/information_technology/data_processing_steps/. BODC supply full information about data collection, data processing and data quality with all data requests to enable users to assess data suitability themselves .

    Instrument(s) used to collect data: wave recorders; sea level recorders.

    Metadata

    File identifier
    3c5785dbad235061b42a446c977c290c XML
    Metadata language
    English
    Hierarchy level
    Dataset
    Date stamp
    2018-02-06T15:16:39
    Metadata standard name

    MEDIN Discovery Metadata Standard
    Metadata standard version

    Version 2.3.8
    Metadata author
    Organisation name Individual name Electronic mail address Role

    British Oceanographic Data Centre

    Polly Hadžiabdic

    enquiries@bodc.ac.uk

    		Point of contact
     
     

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