Landslide risks in the Göta River valley in a changing climate Final report Part 2 - Mapping GÄU The Göta River investigation 2009 - 2011 Linköping 2012 The Göta River investigation Swedish Geotechnical Institute (SGI) Final report, Part 2 SE-581 93 Linköping, Sweden Order Information service, SGI Tel: +46 13 201804 Fax: +46 13 201914 E-mail:
[email protected] Download the report on our website: www.swedgeo.se Photos on the cover © SGI Landslide risks in the Göta River valley in a changing climate Final report Part 2 - Mapping Linköping 2012 4 Landslide risks in the Göta älv valley in a changing climate 5 Preface In 2008, the Swedish Government commissioned the Swedish Geotechnical Institute (SGI) to con- duct a mapping of the risks for landslides along the entire river Göta älv (hereinafter called the Gö- ta River) - risks resulting from the increased flow in the river that would be brought about by cli- mate change (M2008/4694/A). The investigation has been conducted during the period 2009-2011. The date of the final report has, following a government decision (17/11/2011), been postponed until 30 March 2012. The assignment has involved a comprehensive risk analysis incorporating calculations of the prob- ability of landslides and evaluation of the consequences that could arise from such incidents. By identifying the various areas at risk, an assessment has been made of locations where geotechnical stabilising measures may be necessary. An overall cost assessment of the geotechnical aspects of the stabilising measures has been conducted in the areas with a high landslide risk.