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Showing 1 to 20 of 55 for “"debris flows"”.
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Debris flows on Earth and Mars
This thesis explores the morphology of debris flows and their role in shaping planetary surfaces. The primary objective is to assess the scale of the present martian near-surface water budget by studying recent gullies visually similar to water-carved gullies on Earth. The potential involvement of …
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Laboratory Experiments Investigating Entrainment By Debris Flows
As debris flows course down a steep hillside they entrain bed materials such as loose sediments, increasing the size and hazard of the debris flow. The mechanics underlying the particle entrainment are not well-understood. Existing models for the entrainment process include those that explicitly …
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Statistical modeling of rare stochastic disturbance events at continental and global scales: post-fire debris flows and wildland fires
Chapter 1: Frequency-magnitude distribution of debris flows compiled from global data, and comparison with post-fire debris flows in the western U.S. Forecasting debris flow hazard is challenging due to the episodic occurrence of debris flows in response to stochastic precipitation and, in some …
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Statistical modeling of rare stochastic disturbance events at continental and global scales: post-fire debris flows and wildland fires
Chapter 1: Frequency-magnitude distribution of debris flows compiled from global data, and comparison with post-fire debris flows in the western U.S. Forecasting debris flow hazard is challenging due to the episodic occurrence of debris flows in response to stochastic precipitation and, in some …
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A debris flow chronology and analysis of controls on debris flow occurrence in the Upper Colorado River valley, Rocky Mountain National Park, CO
The role of debris flows along the Upper Colorado River was recently highlighted when the Grand Ditch, a 19th-century water-conveyance ditch, overtopped from snowmelt in 2003 and triggered a large debris flow along Lulu Creek, a tributary of the Colorado. Historical aerial photographs indicate that …
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Topographic and material controls on the Scottish debris flow geohazard
Debris flows can be considered the most significant geological hazard in areas of high relief in Scotland having impacted upon slope foot infrastructure several times in recent years. The potency of this geohazard is anticipated to increase over the coming decades due to a climatologically enforced …
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The Effective Viscosity of Ash-Laden Flows
<p>Debris flows can drastically alter ecosystems and damage infrastructure, and there is an increased risk of debris flows following a wildfire. In general, runoff and erosion drastically increase following a wildfire as a result of many processes, one of them being debris flows. Large debris flows …
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The Effective Viscosity of Ash-Laden Flows
<p>Debris flows can drastically alter ecosystems and damage infrastructure, and there is an increased risk of debris flows following a wildfire. In general, runoff and erosion drastically increase following a wildfire as a result of many processes, one of them being debris flows. Large debris flows …
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Post-Wildfire Debris Flow Susceptibility and Preconditioning Factors in the Central Okanagan
Debris flows are a common hazard in British Columbia, but studies on their occurrence in the temperate continental regions of the province are primarily limited to anthropogenic and specific large events. We document 197 debris flows in and around the Regional District of Central Okanagan and the …
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A Comparison of GIS Approaches to Slope Instability Zonation in the Central Blue Ridge Mountains of Virginia
… class and validated using known locations of debris flows. In addition, an assessment of the effects of varying source data (i.e. 10-meter vs. 30-meter) is performed. Among all models and using either resolution data, the Qualitative Map Combination correctly identifies the most debris flows. …
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FUNZIONE DEL BOSCO NELLA FASE DI ARRESTO DEI DEBRIS FLOW
Debris flows, a flowing mixture of sediments, water, air and other materials, are one of the most destructive events in mountain areas: damaged buildings, interrupted infrastructures, fatalities are only some examples of their effects . In Northern Italy, for example, 36% of fatality events in the …
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Sediment in forested and logged gullies, coastal British Columbia
… sediment storage and transfers. Both fluvial and debris flow transport of sediment occur in gullies, and the amount of fluvial transport of sediment which occurs will affect the magnitude of a subsequent debris flow. Coarse woody debris (CWD) may affect the storage and transfer of sediment in the …
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A multi-proxy study of the Kalkkop impact Crater Lake deposits in south-central South Africa: implications for late neogene climate evolution
… massive, structureless carbonates interrupted by debris flows from the crater rim.
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Kinematics and Kinetics of Granular Mixture: Experimental and Numerical Studies
… granular materials are investigated for shallow flows in a drum and compared with a model system for debris flow. Both the simulation and experimental model of dry debris flow show understanding the segregation in a granular mixture is important for predicting erosion and hazard potential in …
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Laboratory Debris Flow Experiments: A Study of Erosion
… on grain size distribution in experimental debris flows and erodible beds. We systematically and independently varied the composition of each the supply and erodible bed material and the flume inclination angle, ϕ. Then, we demonstrate that there is a unique neutral angle, ϕN (the angle at …
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Remote estimation of grain size distribution and simulating grain size effects on debris-flow rheology and post-fire variability of transport by dry ravel
… scale of sediment transport by dry ravel and debris flows. Variability in erosion rates and the grain size distribution of material delivered to channels has been observed due to an increase in the annual areal extent of wildfire in the Western United States. As these changes modify …
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ΠΡΟΔΕΛΤΑΙΚΕΣ ΑΠΟΘΕΣΕΙΣ. ΣΕΙΣΜΙΚΗ ΣΤΡΩΜΑΤΟΓΡΑΦΙΑ-ΙΖΗΜΑΤΟΛΟΓΙΑ-ΕΥΣΤΑΘΕΙΑ ΠΡΑΝΩΝ
… SEISMIC INDUCED MASS MOVEMENTS AND SEDIMENT FLOWS WERE CONCLUDED FROM 3.5 KHZ PROFILES SUCH AS: 1) CREEP IN EVINOS AND THE WESTERN SECTION OF MORNOS PRODELTA. 2) DEBRIS AND TRUBIDITY FLOWS, AS WELL AS INTENSE SLUMPING PHENOMENA IN THE EASTERN SECTION OF MORNOS PRODELTA. 3) POSSIBLE DEBRIS …
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Systematic oversteepening in longitudinal profiles of mixed bedrock-alluvial channels at tributary junctions : Appalachians, Virginia
… flux moving through the drainage system, eg. debris flows, are a promising mechanism for the initiation of systematic oversteepening in the longitudinal profiles.
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