OR/15/015 Introduction

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Lark, R M. 2015. Mapping seabed sediments of the Fulmar rMCZ. British Geological Survey Internal Report, OR/15/015.

This report is on work undertaken for the JNCC under an Addendum to the Memorandum of Agreement dated 20 February 2014 between The Scottish Ministers, Natural Environment Research Council (NERC) and JNCC Support co. (JNCC). Under the terms of this Addendum JNCC requested that BGS carry out geostatistical analysis of sediment sample data from CEND 8/12 survey of Fulmar rMCZ in order to produce maps of sediment distribution in the site.

The methodology is based on that reported by Lark et al. (2012)[1]. The required outputs are predicted values on a grid of mud, gravel and sand content with associated measures of confidence, and estimated probabilities for each of the four EUNIS level 3 sediment texture classes: Mud and sandy mud, Sand and muddy sand, Coarse Sediment and Mixed Sediment (Long, 2006[2]) and the most probable class indicated.

A detailed account of the methodology is provided by Lark et al. (2012)[1] and this report should be read in conjunction with that paper to give a complete explanation of the approach. This report provides additional information where required. the key parameters of the geostatistical models that were estimated for the rMCZ, and summaries of results.

References

  1. 1.0 1.1 LARK, R M, DOVE, D, GREEN, S, RICHARDSON, A E, STEWART, H, and STEVENSON, A. 2012. Spatial prediction of seabed sediment texture classes by cokriging from a legacy database of point observations. Sedimentary Geology, Vol. 281, 35–49.
  2. LONG, D. 2006. BGS Detailed explanation of seabed sediment modified Folk classification. MESH (Mapping European Seabed Habitats) available at http://www.searchmesh.net/PDF/GMHM3_Detailed_explanation_of_seabed_sediment_classification.pdf