Morphology and causes of landslides in Portalet area (Spanish Pyrenees): Probabilistic analysis by means of numerical modelling

García-Davalillo, Juan Carlos; Monod, Bernard; Álvarez‐Fernández, M.I.; García, Gerardo Herrera; Darrozes, José; González‐Nicieza, C.; Maquaire, Olivier

doi:10.1016/j.engfailanal.2013.10.015

Cited by 7 publications

(4 citation statements)

References 12 publications

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“…This explains why landslide occurrence in Kigezi highlands is low on slope elements with very steep and precipitous gradients. As observed by several scholars (Hungr et al 2005;Hosseini et al 2011;López-Davalillo et al 2014), the typical slope gradient for landslide occurrence is between 27° and 38°. In keeping with these observations, slope gradient of the source areas in the present study is between 15° and 45°, with a concentration between 25° and 35°.…”

Section: Slope Gradientmentioning

confidence: 70%

“…Sections with gradients of < 15° have deeper soil profiles as well as very high soil moisture content, but lack a gradient steep enough to initiate movement of materials. Landslide occurrence is therefore low on such slope elements due to the less downslope force required to move materials (López-Davalillo et al 2014). Such slope sections are only depositional areas for the landslide debris.…”

Section: Slope Gradientmentioning

confidence: 99%

“…According to Gao and Maro (2010), topography has been widely reported to bear a close association with landslides. The exact control of topographic settings on landslides is usually analyzed through spatial overlay of landslide distribution maps on topographic layers (López-Davalillo et al 2014). The major topographic parameters that influence landslide occurrence include slope gradient, aspect, curvature, roughness, distance from drainage network and discontinuities (Broothaerts et al 2012).…”

Section: Introductionmentioning

confidence: 99%

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Analysis of topographic parameters underpinning landslide occurrence in Kigezi highlands of southwestern Uganda

et al. 2019

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An assessment of the influence of topography on landslide occurrence in the Kigezi highlands of southwestern Uganda was conducted. Whereas the frequency and magnitude of landslides in these highlands are on the increase, the topographic attributes underpinning landslide occurrence are not well understood. Sixty-five landslide scars were surveyed and mapped to produce landslide distribution maps. Specific topographic parameters, namely slope gradient, profile curvature, topographic wetness index (TWI), stream power index (SPI), and topographic position index (TPI), were assessed on landslide slope sites. The attributes were parameterized in the field and GIS environment using a 10-m DEM. Landslides were noted to concentrate along narrow topographic hollows, as opposed to broad concave slopes in the landscape. The occurrence is dominant in slope zones where slope gradient, profile curvature, TWI, TPI, and SPI are 25°-35°, 0.1-5, 8-18, − 1-1, and > 10, respectively. It was established that profile curvature and slope gradient are the most and least significant topographic parameters in landslide occurrence (R 2 = 0.802, p value = 0.088 and R 2 = 0.5665, p value = 0.057), respectively. An understanding of these topographic underpinnings would serve to identify and predict potential landslide zones within the landscape and enhance landslide hazard mitigation.

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Section: Slope Gradientmentioning

confidence: 70%

Section: Slope Gradientmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of topographic parameters underpinning landslide occurrence in Kigezi highlands of southwestern Uganda

et al. 2019

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“…Landslides normally occur on terrains with steep slopes [1,2]. Slope failures are attributed to factors like topography, geotechnical properties of the material as well as the existence of discontinuities [3,4]. Most of these factors are specific to particular areas and thus, site-specific studies are important [2].…”

Section: Introductionmentioning

confidence: 99%

Implications of Soil Properties on Landslide Occurrence in Kigezi Highlands of South Western Uganda

Nseka¹,

Kakembio²,

Mugagga³

et al. 2022

Landslides

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Generally, soil characteristics have a significant influence on landslide occurrence. This issue has, however, not yet been adequately analysed in Kigezi highlands of South Western Uganda. In this study, soil properties such as dispersion, grain size distribution, Atterberg limits, shear strength and clay mineralogy were analysed to establish their contribution to the spatial distribution of landslides in Kigezi highlands. The results demonstrate that deep soil profiles ranging between 2.5 and 7 meters were dominated by clay-pans at a depth between 0.75 and 3 meters. Although the uppermost surface horizons of the soil profile are loamy sand, the clay content is more than 35% especially in the sub soil. This suggests that the soil materials are Vertic in nature. In addition, the upper soil layers predominantly contain quartz, while subsurface horizons have considerable amounts of illite as the dominant clay minerals, ranging from 43–47%. The average liquid limit and plasticity index was 58.43% and 33.3% respectively. Besides, high average computed weighted plasticity index (28.4%) and expansiveness (38.6%) were obtained. These soil characteristics have great implication on the timing and nature of landslide processes in the study area. A change in soil material due to varying moisture content is thought to be a major trigger of landslides in Kigezi highlands of South Western Uganda. This understanding of soil characteristics is a key step in mitigating landslide hazards in the area.

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Time‐dependent analysis and stability evaluation of plane rotary landslides: Insights from a case study

Huang,

Chen,

Zheng

et al. 2024

Earth Surf Processes Landf

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Plane rotary landslides are characterized by their concealment and challenges in prevention, having caused considerable impacts in recent years. This study aims to elucidate the causative factors behind plane rotary landslides and develop a novel method for assessing their stability through a case. Our focal case, a landslide with weak interlayers, occurred on 1 April 2020, in an open‐pit limestone mine in Sichuan Province, China. The landslide demonstrated distinctive rotational behaviour deviating 45° from the expected direction, presenting a unique case of plane rotary deformation. Employing a multifaceted approach, including geological data analysis, UAV aerial photography, field investigations, laboratory experiments and displacement monitoring, we delved into the deformation and failure mechanisms. Furthermore, A three‐dimensional discrete element method was employed to examine the evolution of the landslide and its relationship with the stable rock mass barrier. The study unravelled the structural alterations of the slope due to mining activities and the degradation of physical and mechanical properties in weak interlayers, which were instrumental in triggering this geological event. The presence of the stable rock mass barrier causes the resultant forces acting on the sliding mass not to pass through its centre of gravity during deformation, thereby generating a moment that induces the rotation. The additional resistance also causes the landslide displacement to transition from being initially dominated by the leading edge to being driven by the trailing edge. This unique displacement pattern serves as a crucial reference for identifying plane rotary landslides.

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Morphology and causes of landslides in Portalet area (Spanish Pyrenees): Probabilistic analysis by means of numerical modelling

Cited by 7 publications

References 12 publications

Analysis of topographic parameters underpinning landslide occurrence in Kigezi highlands of southwestern Uganda

Analysis of topographic parameters underpinning landslide occurrence in Kigezi highlands of southwestern Uganda

Implications of Soil Properties on Landslide Occurrence in Kigezi Highlands of South Western Uganda

Time‐dependent analysis and stability evaluation of plane rotary landslides: Insights from a case study

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