English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/49145
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Title

Robust estimations of current velocities with four-beam broadband ADCPs

AuthorsGilcoto, Miguel ; Jones, Emlyn; Farina-Busto, L.
KeywordsCurrents
Acoustic measurements
Issue Date2009
PublisherAmerican Meteorological Society
CitationJournal of Atmospheric and Oceanic Technology 26(12): 2642-2654 (2009)
AbstractAn extended explanation of the hypothesis and equations traditionally used to transform between four-beam ADCP radial beam velocities and current velocity components is presented. This explanation includes a dissertation about the meaning of the RD Instrument error velocity and a description of the standard beam-to-current components transformation as a least squares solution. Afterward, the variance–covariance matrix associated with the least squares solution is found. Then, a robust solution for transforming radial beam velocities into current components is derived under the formality of a weighted least squares approach. The associated variance–covariance matrix is also formulated and theoretically proves that the modulus of its elements will be generally lower than the corresponding modulus of the variance–covariance matrix associated with the standard least squares solution. Finally, a comparison between the results obtained using the standard least squares solution and the results of the weighted least squares method, using a high-resolution ADCP dataset, is presented. The results show that, in this case, the weighted least squares solution provides variance estimations that are 4% lower over the entire record period (8 days) and 7% lower during a shorter, more energetic period (12 h)
Description13 páginas, 5 figuras, 2 tablas
Publisher version (URL)http://dx.doi.org/10.1175/2009JTECHO674.1
URIhttp://hdl.handle.net/10261/49145
DOI10.1175/2009JTECHO674.1
ISSN0739-0572
E-ISSN1520-0426
Appears in Collections:(IIM) Artículos
Files in This Item:
File Description SizeFormat 
Gilcoto_JTECH_robust estimations.pdf2,16 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.