3c5785dbad235061b42a446c977c290c English dataset Polly Hadžiabdic British Oceanographic Data Centre Head of the BODC Requests Team Joseph Proudman Building 6 Brownlow Street Liverpool Merseyside L3 5DA United Kingdom enquiries@bodc.ac.uk http://www.bodc.ac.uk/ pointOfContact 2018-02-06T15:16:39 MEDIN Discovery Metadata Standard Version 2.3.8 urn:ogc:def:crs:EPSG::4326 OGP Wave statistics from Acajutla, El Salvador British Oceanographic Data Centre record 1048ACAJUTLA 2017-10-03 publication 2010-10-19 creation 2017-01-30 revision EDMED4290 http://www.bodc.ac.uk/ 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. Unknown Livesey & Henderson Unknown Albury House, Albury Guildford Surrey United Kingdom inapplicable originator British Oceanographic Data Centre Director Joseph Proudman Building 6 Brownlow Street Liverpool Merseyside L3 5DA United Kingdom enquiries@bodc.ac.uk http://www.bodc.ac.uk/ custodian asNeeded Natural Environment Research Council Designated Data Centres Marine Environmental Data and Information Network MEDIN metadata record availability 2012-01-11 revision unknown Vertical Coverages 2013-02-06 revision Sea level Wave height and period statistics SeaDataNet PDV 2018-01-12 revision Elevation Oceanographic geographical features INSPIRE themes 2009-07-31 revision Usage restrictions are specified in the terms of the licence restricted otherRestrictions 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/ English oceans elevation -90.00 -89.00 13.00 14.00 1974 1975 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 British Oceanographic Data Centre Director Joseph Proudman Building 6 Brownlow Street Liverpool Merseyside L3 5DA United Kingdom enquiries@bodc.ac.uk http://www.bodc.ac.uk/ distributor https://www.bodc.ac.uk/data/bodc_database/nodb/ BODC online data delivery service Access the BODC 'all data series' data delivery service. This provides an online search and auto-download for all data held in the National Oceanographic Database. order dataset 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.