Showing papers in "Geomorphology in 1999"

TL;DR: In this paper, the authors used geomorphological information to assess areas at high landslide hazard, and help mitigate the associated risk, and found that despite the operational and conceptual limitations, landslide hazard assessment may indeed constitute a suitable, cost-effective aid to land-use planning.

TL;DR: The decrease in rates of production of cosmogenic nuclides occurs because of shielding of cosmic rays by mountains, sloped surfaces, and local rock formations that block them as discussed by the authors.

TL;DR: In this paper, different types of hydrological triggering systems for debris flows, shallow and deeper landslides, are described, and the assessment of meteorological threshold conditions for shallow landslides (1-2 m) needs more detailed meteorological information than for deeper ones (5-20 m).

TL;DR: In this paper, the authors explored the effect of local morphologic disequilibrium on the variation in the depth of soil in a landscape with respect to the local balance between soil production and erosion.

TL;DR: In this paper, the synoptic capability of Landsat Thematic Mapper imagery enables monitoring of large sections of coastline at relatively coarse (30 m) spatial resolution, and areas of rapid change can be identified and targeted for more detailed monitoring in the field or using higher resolution images.

TL;DR: In this article, a model is developed to explore how stream power might vary in the downstream direction, based on the assumption that the longitudinal profile of the river has an exponential form, and the model is tested on three connected streams of different size in the catchment of the River Trent, taking advantage of a relationship between mean annual flood and link magnitude which enables this near-bank full discharge to be estimated at any point within the network.

TL;DR: In this paper, the importance of thermal stress in cold regions by means of high-frequency rock temperature data was shown by showing that differential radiation receipts on slopes of varying orientation and gradient can exert a very strong effect.

TL;DR: In this paper, the authors investigated rockfall activity during thawing periods by collecting rockfall debris fallen on the snow-covered talus slope in a cirque in the Japanese Alps.

TL;DR: A chronology of recent landslides in the upper basin of the Llobregat River, Eastern Pyrenees, has been reconstructed from technical reports, field reconnaissance and dendrogeomorphological analysis.

TL;DR: In this paper, Small et al. used concentrations of the cosmogenic radionuclides (CRNs) 10 Be and 26 Al in regolith and bedrock to deduce the rate of production of regolith on an alpine hillslope in the Wind River Range, WY.

TL;DR: Paired 10 Be and 26 Al analyses (n=14) indicate that pre-Wisconsinan, glaciated bedrock surfaces near the northern (Baffin Island) and southern (Minnesota) paleo-margins of the Laurentide Ice Sheet have long and complex histories of cosmic-ray exposure, including significant periods of partial or complete shielding from cosmic rays.

TL;DR: In this article, the authors evaluate the extent to which 3D models improve predictive ability and prediction utility compared to two-dimensional (2D) applications and show that the 3D model has a higher predictive ability, particularly if the 2D model is not corrected for the effects on flow structure.

TL;DR: A debris flow event occurred in June 1997 in the Dolomites (Eastern Alps, Italy) and was directly observed in the field and recorded by a video camera near its initiation area as discussed by the authors.

TL;DR: In this article, three-dimensional data of the mean and turbulent structure of flow collected at a natural confluence of rivers with discordant beds is presented to assess the role of changes in bed morphology occurring during transport-effective events.

TL;DR: In this article, the applicability of different methods for determining landslide chronologies, frequencies and dynamics in relation to the type of material being dated, sampling location and type of mass movement is discussed.

TL;DR: In this paper, a geomorphological reconnaissance of forms and processes was followed by in situ tests to determine the shear strength of the banks of the Sieve River in order to obtain relations between bank angle and height in limit equilibrium conditions.

TL;DR: In this article, a cosmogenic radionuclide (CRN) profile technique was employed to date strath terraces along the Wind River, WY. By measuring 10 Be and 26 Al profiles, they constrain the exposure age and the mean CRN inheritance for the deposit.

TL;DR: In this paper, the spatial variation of small-scale flooding and muddy floods in rural areas in a medium sized study area (5516 km2) and the linkage with controlling factors was investigated.

TL;DR: In this article, a conceptual model of process-form linkages is proposed based on these results, whereby the step-pool morphology is produced by positive relationships between wavelength and discharge, and between height and particle size.

TL;DR: In the Cabo de Gata ranges of southeast Spain evidence exists to the contrary as discussed by the authors that a fall in base level is seen as stimulating incision into the distal zones of alluvial fans.

TL;DR: In this article, the authors highlight the need for fluvial geomorphology to be an integral part in engineering projects, that is, to be integral to the planning, implementation, and post-project appraisal stages of engineering projects.

TL;DR: In this article, the authors analyzed the arrangement of channel networks and water tracks in Imnavait Creek in Northern Alaska to determine if basins with permafrost possess the same universal characteristics as basins without permfrost.

TL;DR: In this article, the authors used Dendrogeomorphology to evaluate the frequency of landslide activity in the Table Cliffs Plateau of Utah and found that trees subject to stress due to mass-movement have manifested strong and sudden decreases in ring growth.

TL;DR: In this article, the authors present a novel technique for tracing suspended sediment in a mountain stream using fallout radionuclides sorbed to sediment, which can be used to estimate the rates of erosion of the landscape.

TL;DR: A summary of the principles of the luminescence (especially optical) dating methods can be found in this paper, along with a discussion of the potential of the method in a wide range of geomorphological studies which seek to establish the nature of landscape changes over the past interglacialglacial cycle and beyond.

TL;DR: In this article, the limits of the effects of climate on landslides are examined in two basins in the Southern French Alps, where a great many landslides have occurred over more than a century.

TL;DR: In this paper, a model of pool maintenance and sediment sorting is proposed that relies on constriction of flow by recirculating eddies and flow divergence over the exit-slopes of pools.

TL;DR: In this paper, the authors reconstruct the depositional history of the Barasona reservoir in the Esera-Isabena Basin, Central Pyrenees (Spain), based on a 137 Cs -derived chronology.

TL;DR: Anabranching is also related to the influence of tributaries, for some large rivers alternate from single-thread to anabranched along their length in response to tributary inputs of water and sediment as discussed by the authors.

TL;DR: In this article, the authors provide a foundation for understanding and appreciation of rock glaciers from an engineering geomorphologic point of view, and provide practical, important information to aid the engineer and engineering geologist in prudent evaluations of rock glacier as potential sites for human development and uses.