Abstract:
Abstract. Aspect-dependent landslide initiation is an interesting finding and previous studies merely address the role of plant roots on this observed connection between landslide probability and slope aspect. In this work, the aspect-dependent landslide initiation in catchment with same plant species and high vegetation coverage was examined by pore water pressure and hillslope hydrology behavior. Remote sensing interpretation using the high-resolution GeoEye-1 image and digitalized topography found that the landslides on south-facing slope have higher probability, larger basal area and shallower depth than those on north-facing slope. The lower limit of upslope contributing area and slope gradient condition for south-facing landslides is no less than north-facing landslides. The higher basal area of south-facing landslides over north-facing landslides may attribute to the high peak values and slow dissipation of pore water pressure. The absorbed and drained water flow in given time interval, together with the calculated water storage and leakage during the measured rainy season, sufficiently prove that the soil mass above the failure zone for the south-facing slopes are more prone to form pore-water pressure and result in slope failures. In comparison, the two stability fluctuation results from finite and infinite models imply that landslides on south-facing slopes may fail on condition of prolonged antecedent precipitation and intensive rainfall, while those on north-facing slopes may fail merely in response to intensive rainfall. The results of this work provide an insightful view on the aspect-dependent landslide initiation from both classical mechanics and the state of stress.Abstract. Aspect-dependent landslide initiation is an interesting finding and previous studies merely address the role of plant roots on this observed connection between landslide probability and slope aspect. In this work, the aspect-dependent landslide initiation in catchment with same plant species and high vegetation coverage was examined by pore water pressure and hillslope hydrology behavior. Remote sensing interpretation using the high-resolution GeoEye-1 image and digitalized topography found that the landslides on south-facing slope have higher probability, larger basal area and shallower depth than those on north-facing slope. The lower limit of upslope contributing area and slope gradient condition for south-facing landslides is no less than north-facing landslides. The higher basal area of south-facing landslides over north-facing landslides may attribute to the high peak values and slow dissipation of pore water pressure. The absorbed and drained water flow in given time interval, together with the calculated water storage and leakage during the measured rainy season, sufficiently prove that the soil mass above the failure zone for the south-facing slopes are more prone to form pore-water pressure and result in slope failures. In comparison, the two stability fluctuation results from finite and infinite models imply that landslides on south-facing slopes may fail on condition of prolonged antecedent precipitation and intensive rainfall, while those on north-facing slopes may fail merely in response to intensive rainfall. The results of this work provide an insightful view on the aspect-dependent landslide initiation from both classical mechanics and the state of stress.
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Abstract. Aspect-dependent landslide initiation is an interesting finding and previous studies merely address the role of plant roots on this observed connection between landslide probability and slope aspect. In this work, the aspect-dependent landslide initiation in catchment with same plant species and high vegetation coverage was examined by pore water pressure and hillslope hydrology behavior. Remote sensing interpretation using the high-resolution GeoEye-1 image and digitalized topography found that the landslides on south-facing slope have higher probability, larger basal area and shallower depth than those on north-facing slope. The lower limit of upslope contributing area and slope gradient condition for south-facing landslides is no less than north-facing landslides. The higher basal area of south-facing landslides over north-facing landslides may attribute to the high peak values and slow dissipation of pore water pressure. The absorbed and drained water flow in given time interval, together with the calculated water storage and leakage during the measured rainy season, sufficiently prove that the soil mass above the failure zone for the south-facing slopes are more prone to form pore-water pressure and result in slope failures. In comparison, the two stability fluctuation results from finite and infinite models imply that landslides on south-facing slopes may fail on condition of prolonged antecedent precipitation and intensive rainfall, while those on north-facing slopes may fail merely in response to intensive rainfall. The results of this work provide an insightful view on the aspect-dependent landslide initiation from both classical mechanics and the state of stress.
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SLATES
Mass wasting
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Citations (54)
Abstract. Aspect-dependent landslide initiation is an interesting finding and previous studies merely address the role of plant roots on this observed connection between landslide probability and slope aspect. In this work, the aspect-dependent landslide initiation in catchment with same plant species and high vegetation coverage was examined by pore water pressure and hillslope hydrology behavior. Remote sensing interpretation using the high-resolution GeoEye-1 image and digitalized topography found that the landslides on south-facing slope have higher probability, larger basal area and shallower depth than those on north-facing slope. The lower limit of upslope contributing area and slope gradient condition for south-facing landslides is no less than north-facing landslides. The higher basal area of south-facing landslides over north-facing landslides may attribute to the high peak values and slow dissipation of pore water pressure. The absorbed and drained water flow in given time interval, together with the calculated water storage and leakage during the measured rainy season, sufficiently prove that the soil mass above the failure zone for the south-facing slopes are more prone to form pore-water pressure and result in slope failures. In comparison, the two stability fluctuation results from finite and infinite models imply that landslides on south-facing slopes may fail on condition of prolonged antecedent precipitation and intensive rainfall, while those on north-facing slopes may fail merely in response to intensive rainfall. The results of this work provide an insightful view on the aspect-dependent landslide initiation from both classical mechanics and the state of stress.
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Lithology
Marl
Debris flow
Mass movement
Bedrock
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Abstract Knowledge of the mechanisms of rain‐induced shallow landslides can improve the prediction of their occurrence and mitigate subsequent sediment disasters. Here, we examine an artificial slope's subsurface hydrology and propose a new slope stability analysis that includes seepage force and the down‐slope transfer of excess shear forces. We measured pore water pressure and volumetric water content immediately prior to a shallow landslide on an artificial sandy slope of 32°: The direction of the subsurface flow shifted from downward to parallel to the slope in the deepest part of the landslide mass, and this shift coincided with the start of soil displacement. A slope stability analysis that was restricted to individual segments of the landslide mass could not explain the initiation of the landslide; however, inclusion of the transfer of excess shear forces from up‐slope to down‐slope segments improved drastically the predictability. The improved stability analysis revealed that an unstable zone expanded down‐slope with an increase in soil water content, showing that the down‐slope soil initially supported the unstable up‐slope soil; destabilization of this down‐slope soil was the eventual trigger of total slope collapse. Initially, the effect of apparent soil cohesion was the most important factor promoting slope stability, but seepage force became the most important factor promoting slope instability closer to the landslide occurrence. These findings indicate that seepage forces, controlled by changes in direction and magnitude of saturated and unsaturated subsurface flows, may be the main cause of shallow landslides in sandy slopes. Copyright © 2013 John Wiley & Sons, Ltd.
Cohesion (chemistry)
Factor of safety
Landslide mitigation
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Abstract. Aspect-dependent landslide initiation is an interesting finding and previous studies merely address the role of plant roots on this observed connection between landslide probability and slope aspect. In this work, the aspect-dependent landslide initiation in catchment with same plant species and high vegetation coverage was examined by pore water pressure and hillslope hydrology behavior. Remote sensing interpretation using the high-resolution GeoEye-1 image and digitalized topography found that the landslides on south-facing slope have higher probability, larger basal area and shallower depth than those on north-facing slope. The lower limit of upslope contributing area and slope gradient condition for south-facing landslides is no less than north-facing landslides. The higher basal area of south-facing landslides over north-facing landslides may attribute to the high peak values and slow dissipation of pore water pressure. The absorbed and drained water flow in given time interval, together with the calculated water storage and leakage during the measured rainy season, sufficiently prove that the soil mass above the failure zone for the south-facing slopes are more prone to form pore-water pressure and result in slope failures. In comparison, the two stability fluctuation results from finite and infinite models imply that landslides on south-facing slopes may fail on condition of prolonged antecedent precipitation and intensive rainfall, while those on north-facing slopes may fail merely in response to intensive rainfall. The results of this work provide an insightful view on the aspect-dependent landslide initiation from both classical mechanics and the state of stress.
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Abstract. Aspect-dependent landslide initiation is an interesting finding and previous studies merely address the role of plant roots on this observed connection between landslide probability and slope aspect. In this work, the aspect-dependent landslide initiation in catchment with same plant species and high vegetation coverage was examined by pore water pressure and hillslope hydrology behavior. Remote sensing interpretation using the high-resolution GeoEye-1 image and digitalized topography found that the landslides on south-facing slope have higher probability, larger basal area and shallower depth than those on north-facing slope. The lower limit of upslope contributing area and slope gradient condition for south-facing landslides is no less than north-facing landslides. The higher basal area of south-facing landslides over north-facing landslides may attribute to the high peak values and slow dissipation of pore water pressure. The absorbed and drained water flow in given time interval, together with the calculated water storage and leakage during the measured rainy season, sufficiently prove that the soil mass above the failure zone for the south-facing slopes are more prone to form pore-water pressure and result in slope failures. In comparison, the two stability fluctuation results from finite and infinite models imply that landslides on south-facing slopes may fail on condition of prolonged antecedent precipitation and intensive rainfall, while those on north-facing slopes may fail merely in response to intensive rainfall. The results of this work provide an insightful view on the aspect-dependent landslide initiation from both classical mechanics and the state of stress.
Landslide mitigation
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It is well known that many landslides, which occur every year in the world, are triggered by rainfall. The mechanics of slope movements due to pore pressure changes are not completely understood, however, and thus are the focus of this paper. Both the case of first-time slides and that of landslide reactivation are examined. It is shown that simple models can reproduce the processes of slope failure and may help in predicting slope behaviour.Key words: slope, failure, landslide, analysis, water table, clay.
Slope failure
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Citations (129)
Abstract. Aspect-dependent landslide initiation is an interesting finding, and previous studies have attributed this to the mechanical effects of plant roots. In the present study, an overwhelming landslide probability on a south-facing slope over a north-facing slope was found in a localized area with only granite underneath and high cover of Larix kaempferi. These observations cannot be attributed to plant roots but may result from factors related to hillslope hydrology. Differential weathering associated with hillslope hydrology behaviors such as rainfall water storage and leakage, pore water pressure, particle component, and hillslope stability fluctuation were used to examine these observations. Remote sensing interpretation using the high-resolution GeoEye-1 image, digitalized topography, and field investigations showed that landslides on south-facing slopes have a higher probability, larger basal area, and shallower depth than those on a north-facing slope. The lower limits of the upslope-contributing area and slope gradient condition for south-facing landslides were less than those for north-facing landslides. The higher basal areas of south-facing landslides than those of the north-facing landslides may be attributed to the high peak values and slow dissipation of pore water pressure. The absorbed and drained water flow in a given time interval, together with the calculated water storage and leakage measured during the rainy season, demonstrate that the soil mass above the failure zone for south-facing slope is more prone to pore water pressure, which results in slope failures. In comparison, the two stability fluctuation results from the finite and infinite models further verified that landslides on south-facing slopes may fail under conditions of prolonged antecedent precipitation and intensive rainfall. Meanwhile, those on north-facing slopes may fail only in response to intensive rainfall. The results of this study will deepen our knowledge of aspect-dependent landslide initiation from both classical mechanics and the state of stress.
Landslide mitigation
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