OR/14/015 Introduction

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Lark R M. 2014. Mapping seabed sediments of the Swallow Sand and South-west Deeps (West) MCZs. British Geological Survey Internal Report, OR/14/015.

These articles are 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 the CEND 8/12 survey of Swallow Sand MCZ and CEND 6/13 survey of South-west Deeps (West) MCZ in order to produce maps of sediment distribution in the sites.

The methodology to be used 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, 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 these two MCZs, and summaries of results.


  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