Terrain analysis of the Racetrack basin and the slidingrocks of Death Valley
Arid area ; California ; El Niño ; Geographical information system ; Geomorphometry ; Quaternary ; Sliderocks ; United States of America ; Wind speed ; Years 1990-99
The Racetrack Playa's unusual surface features known as slidingrocks have been the subject of an ongoing debate and several mapping projects for half a century, although the causative mechanism remains unresolved. In 1996, the AA. generated
the first complete map of all observed slidingrock trails by submeter differential Global Positioning System (DGPS) mapping technology. Follow-up surveys in 1998 and 1999 revealed little modification of the 1996 slidingrock configuration. Only 4 rocks were
Water induced sliding of rocks on playas Alkali Flat in big Smoky Valley, Nevada
Field evidence, climatological data, and calculations based on physics prove that tracks on the Alkali Flat, caused by sliding stones (playa scrapers), result from subaquatic or at least inaquatic sliding. Driving force usually is the hydraulic
energy of surface runoff. Occasionally wind may contribute additional energy but even then it is mainly propagated through the water. This contribution to microgeomorphology and to geomorphodynamics sheds new light on the genesis of sliding tracks
K problému delimitacie potencialnych zosuvnych oblasti na Slovensku To the problem of delimitation of potential slide areas in Slovakia
According to the traditional concept the landslide is a gravitational movement of rock material and it is possible to delimitate only the greatest basic potential slide areas. A more detailed delimitation of landslide areas enables a precised areal
This second part of a review deals with the mechanisms of rock glacier formation and flow. The AA. first discuss terminological and classification problems associated with rock glaciers and dynamic nature of rock glaciers. The third part concludes
this series of papers by discussing the role and significance of rock glaciers in mountain geomorphology, glaciology and environmental reconstructions.
Using the prehistoric rockslides and sites of potential rockslides in Kananaskis Country, Alberta, as data, this paper examines the steady-state model and introduces a new model, the exhaustion model, which predicts the probability of landsliding
Debris avalanches and other mass wasting deposits are common geomorphic features in the White Mountains. This study, based on air photo interpretation of 173 randomly selected slide scars, and supported by field observations and statistical analysis
, examines the relative importance of lithology and geologic structure on slide occurrence, as well as the relationship between topography and slide morphology. Results indicate that the frequency of slide scars is significantly higher in sections underlain
by metasedimentary lithologies than in areas dominated by plutonic rocks.
and flows, the geomorphic imprints of deep-seated bedrock failures are dominant and persistent. Over 50 large (>1 km2) landslides comprising rockslide/avalanches, complex rotational and rock-block slides, wedge failures, and deep-seated gravitational slope
Landslides and runoff are dominant erosional agents in the tectonically active alpine South Westland area of New Zealand, characterized by high uplift rates and extreme orographic precipitation. Despite a high density of shallow debris slides
Mechanism of failure and slope development in rock masses
Cliff ; England ; Geotechnics ; Island ; Limestone ; Mass movement ; Model ; Rock mechanics ; Slope ; Slope gradient ; United Kingdom
to the surface of the Earth, slope morphology and development. Particular attention has been paid to the control of the geometrical distribution of discontinuities in a rock mass and the factors that delimit particular types of failure, such as topples and slides
This paper examines the mechanisms of failure in jointed rock slopes. The Universal Distinct Element Code (UDEC) has been employed in this study to examine associations between rock-mass geotechnical properties, the processes operating at and close
. After a theoretical modelling exercise, real-world rock slopes were studied from the Portland Limestone outcrop of the Isle of Purbeck, England.
to account for the removal of basal rock especially in regions of high cleavage concentrations, the details again depending upon the sliding coefficient.
forms of these asymptotic expansions depend on the form of the spatial dependance of the sliding law and further more on the numerical values of the viscosity coefficient. It is, moreover argued that the stress concentrations are sufficiently pronounced
A paragenetic assemblage of gravitational processes takes part in slope modelling at the Southern coast of the Crimea, including rock falls, scree sliding, landslides and creep. The processes are elements of the complete cycle of slope formation
, the rock and soil being involved into movement gradually, starting form the sea coast and proceeding to the crimean Plateau (Yayla). Individual landforms evolution may be controlled by technogenous factors as well as by natural ones.Slopes' morpholements
This paper reports the results of a series of experiments on the downslope movement of rock fragments due to trampling by sheep and goats on a scree slope near Aglasun, Turkey. The experimental results are used to obtain a first estimate
on the intensity of the process which can then be compared to the reported intensity of other processes causing the movement of rock fragments on steep slopes. Furthermore, the effect of rock fragment movement on downslope and vertical sorting are analysed.
Structural control and types of movements of rock mass in anisotropic rocks : case studies in the Polish Flysch Carpathians
This article presents the main types of mass movements in the highly anisotropic flysch massifs : lateral spreading and rock flow, topple, translational, rotational and compound sliding and complex type of mass movements, which are illustrated
depression, and the elucidation of the relationships between subaqueous and subaerial slope processes. The AA. propose a classification based on the landslide's size and type of movement. They recognized rock fall/topples, debris flows, rockslides and slump
, complex rockslides/channelled flows and debris slide and slump. Two main landslide hazard scenarios have been depicted and discussed from the results of the integrated analysis of both subaerial and submerged gravity-induced landforms.
. Additionally, the landslide contains several sheared zones where the rocks are considerably weathered. These sheared zones act as the sliding plane. Also, the debris fan at the lower part suggests that the landslide has been reactivated several times
Based on the prominent type of failure, the highway (Mugling–Narayanghat road section in Nepal) can be divided into 3 sections : a) dominated by shallow landslides and debris slides/flows; b) dominated by large-scale, deep-seated landslides; and c
) dominated by rock topples. According to the selected methodological approaches, data from detailed geological, geomorphological and geomechanical surveys, it is clear that these topples are mainly related to the geological structures of the region
Talus fabric in Tuckerman Ravine, New Hampshire : evidence for a tongue-shaped rock glacier
Cirque ; Erratic boulder ; Moraine ; Mountain ; New England ; Palaeogeography ; Rock glacier ; Sedimentology ; Sliderocks ; Slope deposit ; United States of America
an oxidation front, where chlorite is altered to Al-vermiculite, graphite and pyrite are oxidized and depleted, and goethite precipitates. Pyrite oxidation yields sulphuric acid, which penetrates further downward, interacting with and weakening the rocks
. In addition to this chemical weakening, stress release and shearing along schistosities form an incipient shear zone, which propagates to a sliding zone that forms the rupture surface of a landslide. Once a sliding zone has developed, it inhibits downward