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Climate change induced river erosion as a trigger for landslide
Statens geotekniska institut.
Statens geotekniska institut.
Statens geotekniska institut.
Statens geotekniska institut.
2016 (Engelska)Ingår i: Proceedings of the 17th Nordic Geotechnical Meeting, NGM 2016, Reykjavik, Iceland, 25-28 May, 2016, Reykjavik: Icelandic Geotechnical Society , 2016, s. 1183-1192Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Most landslides are triggered by precipitation, river erosion, or human impact, or both. Regions experiencing an increase in precipitation from climate change may be at elevated risk for increased landslide frequency. The Swedish Geotechnical Institute is developing a methodology for landslide risk analysis and mapping along Swedish rivers and with the consideration of climate change effects. River geometry is dynamic and is under constant change, however most slope stability analyses are made under the assumption that the condition is static. No consideration is taken to future changes in slope geometry from river erosion. But, is it even possible to assess how river cross sections will change in future along with the effect of increased river flows due to the climate change? There are yet no models that can combine soil mechanics with hydrodynamic processes. The Swedish Geotechnical Institute is developing a methodology to calculate possible future changes in river cross sections and with respect to climate change effects The approach is based on various measurements and analyses like bathymetric surveys, sediment characterization, hydrodynamic modelling of river flows, analysis of shoreline displacement with time by using aerial photos, and comparison between old and new cross sections. Erosive river flows are assessed and the duration of such flows in future (year 2100) is estimated based on existing climate analyses. Comprehensive calculation of river bed erosion is made in GIS, and is combined with bank erosion calculation in chosen cross sections. Calculation of slope stability and the probability of slope failure are then done for several cross sections, both for today´s geometry and for an expected geometry by year 2100. The approach was first developed in the landslide risk analysis for Göta Älv river, Sweden, and further developed and simplified for Norsälven River, Sweden. Currently, a landslide risk analysis for Säveån river has just been started.

Ort, förlag, år, upplaga, sidor
Reykjavik: Icelandic Geotechnical Society , 2016. s. 1183-1192
Nyckelord [en]
River, Erosion, Landslide, Risk assessment, GIS, Precipitation, Rainfall, Climate change, Norsälven, Sweden, Conference, Reykjavik, 2016, English
Nationell ämneskategori
Geoteknik
Identifikatorer
URN: urn:nbn:se:swedgeo:diva-815Lokalt ID: 000084250OAI: oai:DiVA.org:swedgeo-815DiVA, id: diva2:1359459
Konferens
17th Nordic Geotechnical Meeting, NGM 2016, Reykjavik, Iceland, 25-28 May, 2016
Tillgänglig från: 2019-10-09 Skapad: 2019-10-09 Senast uppdaterad: 2019-10-09

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