Variographic refinement of North Sea herring acoustic survey data

P G Fernandes, E J Simmonds

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A log backtransformed variogram was used to provide a robust estimation of the experimental variogram in the presence of highly skewed data, such as those obtained in fisheries acoustic surveys. Simulations based on North Sea herring surveys were carried out which found no evidence of greater bias in the log backtransformed variogram relative to the classical variogram. The log backtransform was then applied to six North Sea herring acoustic surveys to determine how best to utilise the available datasets. The exclusion of intertransect data and use of along-the-track data did not confer any significant additional variographic stability. When divided into eastern and western regions, values of spatial dependence (nugget as a proportion of sill) were consistently greater in the western region. The recommended dataset selection criteria is, therefore, to use the log backtransform on the whole data set (i.e. including intertransects) separated by region (east and west). Variogram modelling and the resulting inferences on herring distributions are discussed.

Original languageEnglish
Title of host publicationgeoENV I — Geostatistics for Environmental Applications
Subtitle of host publicationProceedings of the Geostatistics for Environmental Applications Workshop, Lisbon, Portugal, 18–19 November 1996Proceedings of the Geostatistics for Environmental Applications Workshop, Lisbon, Portugal, 18–19 November 1996
EditorsA Soares, J Gomez-Hernandez, R Froidevaux
Place of PublicationDordrecht
PublisherSpringer
Pages451-462
Number of pages12
ISBN (Electronic)978-94-017-1675-8
ISBN (Print)978-90-481-4861-5
DOIs
Publication statusPublished - 1997
Event1st European Conference on Geostatistics for Environmental Applications (GeoENV I) - LISBAN
Duration: 18 Nov 199619 Nov 1996

Publication series

NameQuantitative Geology and Geostatistics
PublisherSpringer
Volume9
ISSN (Print)0924-1973

Conference

Conference1st European Conference on Geostatistics for Environmental Applications (GeoENV I)
CityLISBAN
Period18/11/9619/11/96

Cite this

Fernandes, P. G., & Simmonds, E. J. (1997). Variographic refinement of North Sea herring acoustic survey data. In A. Soares, J. Gomez-Hernandez, & R. Froidevaux (Eds.), geoENV I — Geostatistics for Environmental Applications: Proceedings of the Geostatistics for Environmental Applications Workshop, Lisbon, Portugal, 18–19 November 1996Proceedings of the Geostatistics for Environmental Applications Workshop, Lisbon, Portugal, 18–19 November 1996 (pp. 451-462). (Quantitative Geology and Geostatistics; Vol. 9). Springer . https://doi.org/10.1007/978-94-017-1675-8_37