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The GIS approach to evaporite karst geohazards in Great Britain

Cooper, Anthony. 2008 The GIS approach to evaporite karst geohazards in Great Britain. Environmental Geology, 53 (5). 981-992. 10.1007/s00254-007-0724-8

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Abstract/Summary

Evaporite karst in Great Britain has formed in Permian and Triassic gypsum, and in Triassic salt. Active dissolution of these deposits can occur on a human rather than a geological timescale causing subsidence and building damage. The British Geological Survey has taken two approaches towards understanding and advising on hazards caused by dissolution of these soluble rocks. At a detailed level, a national database and GIS of karstic features is being populated. Information gathered includes dolines, springs, stream sinks, caves and building damage. At a national level, the soluble rocks in Great Britain have been identified and digital-map polygon information relating to them has been extracted from the British 1:50,000-scale digital map. These areas have been assessed, and in places their margins extended to include some overlying rocks where subsidence features are known to penetrate upwards through the overlying sequence. The national areas have then been assessed using the detailed local information to assign a susceptibility rating from A (extremely low) to E (high), depending on the nature and regularity of the subsidence events that occur. This national zonation of the soluble rocks can be used for planning, construction and the insurance businesses. It has also proved useful for assessing the potential stability of linear routes, such as roads and pipelines or for other important structures such as bridges and buildings. The information can also be used to delineate zone of karstic groundwater flow.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1007/s00254-007-0724-8
Programmes: BGS Programmes 2008 > Earth hazards and systems
ISSN: 0943-0105
Additional Keywords: Evaporite, Karst, Subsidence, GIS, Hazard assessment, planning, development, insurance, gypsum, salt, aquifer, hydrogeology, brine, building damage
NORA Subject Terms: Computer Science
Earth Sciences
Data and Information
Date made live: 25 Feb 2009 17:32
URI: http://nora.nerc.ac.uk/id/eprint/6265

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