Preprints
https://doi.org/10.5194/nhess-2019-54
https://doi.org/10.5194/nhess-2019-54

  12 Mar 2019

12 Mar 2019

Review status: this discussion paper is a preprint. It has been under review for the journal Natural Hazards and Earth System Sciences (NHESS). The manuscript was not accepted for further review after discussion.

Creating a national scale debris flow susceptibility model for Great Britain: a GIS-based heuristic approach

Emma J. Bee, Claire Dashwood, Catherine Pennington, Roxana L. Ciurean, and Katy Lee Emma J. Bee et al.
  • British Geological Survey, Environmental Science Centre, Nicker Hill, Keyworth, UK

Abstract. Debris flows in Great Britain have caused damage to transport infrastructure, buildings, and disruption to businesses and communities. This study describes a GIS-based heuristic model developed by the British Geological Survey (BGS) to produce a national scale spatial assessment of debris flow susceptibility for Great Britain. The model provides information on the potential for debris flow occurrence using properties and characteristics of geological materials (permeability, material availability and characteristics when weathered), slope angle and proximity to stream channels as indicators of susceptibility. Building on existing knowledge, the model takes into account the presence or absence of glacial scouring. As determined by the team of geologists and geomorphologists, the model ranks the availability of debris material and slope as the two dominant factors important for potential debris flow initiation, however it also considers other factors such as geological controls on infiltration. The resultant model shows that over 90 % of the mapped debris flows in the BGS inventory occurred in areas with the highest potential for instability and approximately 6 % were attributed to areas where the model suggested that debris flows are unlikely or not thought to occur. Model validation in the Cairngorm Mountains indicated a better performance, with 93.50 % in the former and less than 3 % in the latter category. Although the quality of the input datasets and selected methodological approach bear limitations and introduce a number of uncertainties, overall, the proposed susceptibility model performs better than previous attempts, representing a useful tool in the hands of policy-makers, developers and engineers to support regional or national scale development action plans and disaster risk reduction strategies.

Emma J. Bee et al.

 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Emma J. Bee et al.

Data sets

GeoSure Extra: Debris Flow Susceptibility Model for Great Britain (version 6.0) British Geological Survey https://doi.org/10.5285/6f46c720-cab3-4c2e-8dad-8bd2f8f1b4ae

Emma J. Bee et al.

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Latest update: 02 Aug 2021
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Short summary
Debris flows in Great Britain have caused damage to infrastructure, buildings, and disruption to businesses and communities. This paper outlines a methodology incorporating expert judgement and environmental factors to derive a debris flow susceptibility map for Great Britain. This spatial dataset provides a useful tool for policy-makers, developers and engineers, and can support development action plans and risk reduction strategies at the regional or national scale.
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