Long‐term precipitation and slide activity in south‐eastern Norway, autumn 2000

Jaedicke, Christian; Kleven, Arne

doi:10.1002/hyp.6878

Cited by 13 publications

(6 citation statements)

References 2 publications

(1 reference statement)

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“…The area is known for its unstable ground and quickclay landslide accidents (e.g. Furseth, 2006) occur frequently in connection with events of long-lasting or intensive precipitation and high river discharge (Jaedicke and Kleven, 2007).…”

Section: Methodsmentioning

confidence: 99%

Spatial and temporal variations of Norwegian geohazards in a changing climate, the GeoExtreme Project

Jaedicke

Solheim

Blikra³

et al. 2008

Nat. Hazards Earth Syst. Sci.

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Abstract. Various types of slope processes, mainly landslides and avalanches (snow, rock, clay and debris) pose together with floods the main geohazards in Norway. Landslides and avalanches have caused more than 2000 casualties and considerable damage to infrastructure over the last 150 years. The interdisciplinary research project "GeoExtreme" focuses on investigating the coupling between meteorological factors and landslides and avalanches, extrapolating this into the near future with a changing climate and estimating the socioeconomic implications. The main objective of the project is to predict future geohazard changes in a changing climate. A database consisting of more than 20 000 recorded historical events have been coupled with a meteorological database to assess the predictability of landslides and avalanches caused by meteorological conditions. Present day climate and near future climate scenarios are modelled with a global climate model on a stretched grid, focusing on extreme weather events in Norway. The effects of climate change on landslides and avalanche activity are studied in four selected areas covering the most important climatic regions in Norway. The statistical analysis of historical landslide and avalanche events versus weather observations shows strong regional differences in the country. Avalanches show the best correlation with weather events while landslides and rockfalls are less correlated. The new climate modelling approach applying spectral nudging to achieve a regional downscaling for Norway proves to reproduce extreme events of precipitation much better than conventionalCorrespondence to: C. Jaedicke (cj@ngi.no) modelling approaches. Detailed studies of slope stabilities in one of the selected study area show a high sensitivity of slope stability in a changed precipitation regime. The value of elements at risk was estimated in one study area using a GIS based approach that includes an estimation of the values within given present state hazard zones. The ongoing project will apply the future climate scenarios to predict the changes in geohazard levels, as well as an evaluation of the resulting socioeconomic effects on the Norwegian society in the coming 50 years.

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Section: Methodsmentioning

confidence: 99%

Spatial and temporal variations of Norwegian geohazards in a changing climate, the GeoExtreme Project

Jaedicke

Solheim

Blikra³

et al. 2008

Nat. Hazards Earth Syst. Sci.

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“…The autumn 25 of year 2000 gave unusually large long-term rainfall in Eastern Norway, comparing to return periods well above 100 years for monthly rainfall (Jaedicke and Kleven, 2007). In the first step of the seepage analysis, annual rainfall of 800 mm was distributed evenly, to approximate initial conditions for analysis of subsequent heavy rainfall.…”

Section: Model Slope and Analyses 10mentioning

confidence: 99%

“…The study is concentrated around 15 a landslide site at the farm Negarden Sander in the municipality of Eidsvoll, Upper Romerike region in Eastern Norway. The landslide was one of many slopes failing in year 2000, following extreme long-term rainfall (Jaedicke and Kleven, 2007). In year 2000 at least four different shallow landslides occurred within a limited area (Fig.…”

mentioning

confidence: 99%

Influence of extreme long-term rainfall and unsaturated soil properties on triggering of a landslide – a case study

Heyerdahl

2017

Preprint

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A case study of a natural slope in Eastern Norway that failed after extreme long-term rainfall in year 2000 was performed.Effect of soil suction on soil shear strength was investigated for intact specimens of Quaternary silt/sand, using an unsaturated shear box apparatus. Common prediction models under-predicted the unsaturated shear strength, particularly for small 10 suctions. Analyses of rainfall infiltration were performed for silt and sand slopes, based on retention curves measured in laboratory. For normal annual rainfall of 800 mm/year the model slope is theoretically stable. Extreme rainfall (240 mm in 30 days) during the autumn of year 2000 results in a rise of groundwater and loss of soil suction in the vadose zone. To reach theoretical slope failure, lower cohesion had to be assumed than measured in laboratory. High cohesion may be caused by cementation in shallow soil layers, and lower cohesion may be appropriate. Slope stability analyses based on transient seepage 15 analysis of rainfall show gradual decrease of slope stability towards slope failure (for the silt slope). With expected future increase in rainfall, more attention is needed on the role of unsaturated soil properties in rainfall triggering of landslides in different soil types, climatic conditions and geologic settings.

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“…A study of meteorological conditions leading to the release of a high number of slides in primarily marine sediments in Eastern Norway during the autumn year 2000 indicated that long-term rainfall rather than intense scours was the primary landslide trigger [1].…”

Section: Landslide Morphologymentioning

confidence: 99%

“…The landslide was released in the unusually rainy autumn of year 2000 [1] in a slope consisting of 5 m layered sand and silt overlying a thick marine clay deposit. The landslide is typical of many landslides in the region, often released in silty and sandy deposits.…”

Section: Landslide Sitementioning

confidence: 99%

Rainfall-induced landslides in Quaternary soils in Norway

Heyerdahl

2016

E3S Web Conf.

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Abstract. Increased intensity of rainfall in later years seems to result in increased frequency of rainfall-induced landslides in natural slopes with glacial Quaternary deposits, which cover large parts of Norway. Many slides hit railway and road infrastructure, and sometimes dwellings. Typically, the soil matrix has a high content of intermediate soils (sand and silt). Natural soil slopes may have inclinations above the effective friction angle of the soils. Slope stability hence must rely on some cohesion, which often is "apparent", i.e. caused by negative pore-water pressure (suction). Dissipation of suction during short-or long-term rainfall hence results in reduced shear strength of the slope, and may lead to slope failure. There is a scarcity of data for Norwegian soils for thorough analysis of landslide triggering based on unsaturated geomechanics. More data may result in improved landslide warning. In this paper, results from unsaturated shear box testing of samples of a silty sand taken from a landslide site in Eastern Norway are presented and discussed.

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Long‐term precipitation and slide activity in south‐eastern Norway, autumn 2000

Cited by 13 publications

References 2 publications

Spatial and temporal variations of Norwegian geohazards in a changing climate, the GeoExtreme Project

Spatial and temporal variations of Norwegian geohazards in a changing climate, the GeoExtreme Project

Influence of extreme long-term rainfall and unsaturated soil properties on triggering of a landslide – a case study

Rainfall-induced landslides in Quaternary soils in Norway

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