Landslides From Massive Rock Slope Failure and Associated Phenomena

Evans, Stephen G.; Mugnozza, Giuseppe Scarascia; Strom, Alexander; Hermanns, Reginald L.; Ischuk, Anatoly; Vinnichenko, S.

doi:10.1007/978-1-4020-4037-5_1

Cited by 75 publications

(53 citation statements)

References 200 publications

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“…Most often, the newly created channel is shifted from the main direction of the stream. For instance, the Eureka River (western Canada) cut a new channel around the toe of a 20-meter-high landslide dam formed in 1990, abandoning the pre-landslide channel [16][17][18]. Incision has been rapid (almost 1 m/year) as the landslide was mainly constituted by wet earth and loose rocks.…”

Section: Introductionmentioning

confidence: 99%

River Courses Affected by Landslides and Implications for Hazard Assessment: A High Resolution Remote Sensing Case Study in NE Iraq–W Iran

Othman

Gloaguen

2013

Remote Sensing

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Abstract:The objective of this study is to understand the effect of landslides on the drainage network within the area of interest. We thus test the potential of rivers to record the intensity of landslides that affected their courses. The study area is located within the Zagros orogenic belt along the border between Iraq and Iran. We identified 280 landslides through nine QuickBird scenes using visual photo-interpretation. The total landslide area of 40.05 km 2 and their distribution follows a NW-SE trend due to the tectonic control of main thrust faults. We observe a strong control of the landslides on the river course. We quantify the relationship between riverbed displacement and mass wasting occurrences using landslide sizes versus river offset and hypsometric integrals. Many valleys and river channels are curved around the toe of landslides, thus producing an offset of the stream which increases with the landslide area. The river offsets were quantified using two geomorphic indices: the river with respect to the basin midline (F b ); and the offset from the main river direction (F d ). Hypsometry and stream offset seem to be correlated. In addition; the analysis of selected river courses may give some information on the sizes of the past landslide events and therefore contribute to the hazard assessment.

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Section: Introductionmentioning

confidence: 99%

River Courses Affected by Landslides and Implications for Hazard Assessment: A High Resolution Remote Sensing Case Study in NE Iraq–W Iran

Othman

Gloaguen

2013

Remote Sensing

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“…But, due to the impact of a rockslide on the valley side and transformation to the debris with no clear shear zone, the liquefaction would transfer into fluidization, and a complicated process occurs that involves simultaneous entrainment, plowing, and lubrication at the front of a rock avalanche (Hungr 2006). When debris from a rock slope failure impacts channel or valley floor sediments, a destructive debris flow may be mobilized that travels well beyond the margins of the initial landslide debris (Evans et al 2006). Similar effects may result from impacts of rockfall debris on saturated colluvium or talus forming the lower part of a valley side slope (Hungr 2006).…”

Section: Estimation Of the Slide Velocitymentioning

confidence: 98%

Research on catastrophic rock avalanche at Guanling, Guizhou, China

et al. 2011

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On June 28, 2010, a catastrophic rock avalanche occurred after an extreme rainstorm at Guanling with N 25°59′10′′ in latitude and E 105°16′50′′ in longitude, Guizhou, China. This rock avalanche has a long run-out distance of 1.5km, with 1.75 million cubic meters of debris instantly burying two villages and resulting in 99 deaths. It originated in the coal measure strata, with the upper part of limestone and dolomite, the middle part of the sandstone with gentle inclination, and the lower part of shale and mudstone, together locally with coals. This kind of unique structure, with hard resistant caprock overlying softer ductile rocks, coupled with the central outflow region at the contact zone, has catastrophic potential for rock avalanches and creates challenges for engineering geological/hydrogeological analysis. The topography showed that the hillside slopes were steeper at the upper portion but gentler in the lower portion, looked like the shape of a "boot." The upper steep landform easily led to slope instability due to its high static shear stresses, and the wide middle and lower parts provided kinematic conditions for long run-out. Transformation of the larger potential energy into kinetic energy contributed to the formation of a rapid long run-out rock avalanche. The rainfall from June 27 to 28 was the apparent trigger of this catastrophic avalanche. The measured rainfall of more than 310mm within 24h exceeded the local historical records that were recorded over the last 60 years. The pore pressure on discontinuities of sandstone had an effect on the slope stability. The valley runoff supplied a saturated base for the long run-out debris, inducing an additional increase of the terminus distance and the increased velocity of the avalanche movement.

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“…Crosta, 1996;Evans et al, 2006). Mountain slopes affected by DSGSD show distinct landforms, including tension cracks, uphill-and downhill-facing scarps, linear depressions and multiple ridges, collectively called sackung features (e.g.…”

Section: Introductionmentioning

confidence: 99%