A view on some hydrological triggering systems in landslides

Asch, Th.W.J. van; Buma, Jelle; Beek, L. P. H. van

doi:10.1016/s0169-555x(99)00042-2

Cited by 332 publications

(179 citation statements)

References 6 publications

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“…These characteristics are supplemented by the plasticity index P L P I w w   which characterizes the state of plasticity of a soil. It is the size of the range of water content where the soil exhibits plastic properties [31]. Atterberg limits L w and P w are useful parameters for clayey soils.…”

Section: ) Laboratory Testsmentioning

confidence: 99%

Geophysical and Geotechnical Investigations of a Landslide in Kekem Area, Western Cameroon

Epada¹,

Ganno²,

Tabod³

2012

IJG

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Geophysical and geotechnical surveys were conducted in the Western Cameroon (Kekem area) following a landslide on argillaceous material in order to understand the triggering processes and mechanisms of this landslide and to assess the stability of the slope. The geophysical soundings consisting of vertical electrical soundings with the Schlumberger electrode array configuration were carried out to monitor the behaviour of electrical resistivity in the landslide. Geoelectrical data showed a zone of low resistivity values identified as a clayey sand-filled aquifer. This aquifer played an important role in the triggering process of the landslide. Geotechnical soundings showed that the aquifer had a thickness of 7.0 m. The depth from the landslide crest level to the failure surface reached 3.0 m and 20.6 m. Laboratory tests were then carried out in order to evaluate the cohesion of the soil and the angle of internal friction, and to calculate the safety factor in view of making a stability analysis. The laboratory results exhibited a soil with low consistency, almost doughy. The mean value of the safety factor (1.4) been lower than the slope stability coefficient (1.5), revealed that the slope is unstable, likely to know at any moment a reactivation of the slide. This study showed that electrical soundings coupled with geotechnical surveys are useful tools for the characterization of landslides.

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Section: ) Laboratory Testsmentioning

confidence: 99%

Geophysical and Geotechnical Investigations of a Landslide in Kekem Area, Western Cameroon

Epada¹,

Ganno²,

Tabod³

2012

IJG

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“…These deterministic models require a number of input maps, related to soil depth, soil strength, soil-water conditions and slope angles. Sensitivity analyses have shown the relative importance of the indicators (van Asch et al 1999;Zaitchik et al 2003;Schmidt and Dikau 2004;van Beek and van Asch 2004). Combining inventory analysis (empirical modeling) and physical rules established in the deterministic models provide a better understanding for designing appropriated hazard indicators.…”

Section: National Landslide Risk Assessment Model Design Issues and Omentioning

confidence: 99%

Generation of a landslide risk index map for Cuba using spatial multi-criteria evaluation

Abella

Westen²

2007

Landslides

177

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This paper explains the procedure for the generation of a landslide risk index map at national level in Cuba, using a semiquantitative model with ten indicator maps and a cell size of 90× 90 m. The model was designed and implemented using spatial multi-criteria evaluation techniques in a GIS system. Each indicator was processed, analysed and standardised according to its contribution to hazard and vulnerability. The indicators were weighted using direct, pairwise comparison and rank-ordering weighting methods, and weights were combined to obtain the final landslide risk index map. The results were analysed per physiographic region and administrative units at provincial and municipal levels. The Sierra Maestra mountain system was found to have the largest concentration of high landslide risk index values while the Nipe-Cristal-Baracoa system has the highest absolute values, although they are more dispersed. The results obtained allow designing an appropriated landslide risk mitigation plan at national level and to link the information to the national hurricane early warning system, allowing also warning and evacuation for landslide-prone areas.

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“…The development of positive pore pressures in soil and colluvium profiles due to the infiltration of water during intense and/or prolonged rainfall periods is usually considered the main triggering mechanism (Wieczorek, 1987;Van Asch et al, 1999), although other processes like earthquakes or volcanic eruptions can also play an important role in some regions. In populated mountain regions, shallow landslides often result from the interaction between environmental and human factors (Caine, 1980;Blijenberg, 1998).…”

Section: Introductionmentioning

confidence: 99%

Changes in land cover and shallow landslide activity: A case study in the Spanish Pyrenees

2006

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The Pyrenees, like many other mountain areas in Europe, have experienced depopulation and land abandonment during the 20th Century. This has encouraged vegetation recovery in formerly occupied areas, including reforestation to promote woodland. The objective of this study is to analyse the effects of these changes on shallow landsliding, a process responsible for erosion and land degradation in many mountain areas. A sequence of aerial images reveals a slight decrease in the landslide occurrence rate in the last half of the 20th Century and a parallel increase in the landslide extinction rate, i.e. the rate at which evidence of landslide activity is removed by vegetation colonisation. A logistic regression routine was used to assess the influence of land use and vegetation recovery in the occurrence of shallow landslides.The result shows that the former arable fields on the valley slopes still facilitate landsliding, even after land abandonment and revegetation by shrubs or trees. A shift in the topographic location of landslides was also detected, pointing to an increased importance of water redistribution in the slopes after prolonged rainfall periods.

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A view on some hydrological triggering systems in landslides

Cited by 332 publications

References 6 publications

Geophysical and Geotechnical Investigations of a Landslide in Kekem Area, Western Cameroon

Geophysical and Geotechnical Investigations of a Landslide in Kekem Area, Western Cameroon

Generation of a landslide risk index map for Cuba using spatial multi-criteria evaluation

Changes in land cover and shallow landslide activity: A case study in the Spanish Pyrenees

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