Search Results - "Nathan Bradley, D."
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Measuring gravel transport and dispersion in a mountain river using passive radio tracers
Published in Earth surface processes and landforms (01-08-2012)“…ABSTRACT Random walk models of fluvial sediment transport recognize that grains move intermittently, with short duration steps separated by rests that are…”
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Fractional dispersion in a sand bed river
Published in Journal of Geophysical Research (17-03-2010)“…Random walk models of fluvial bed load transport use probability distributions to describe the distance a grain travels during an episode of transport and the…”
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Direct Observation of Heavy‐Tailed Storage Times of Bed Load Tracer Particles Causing Anomalous Superdiffusion
Published in Geophysical research letters (28-12-2017)“…A consensus has formed that the step length distribution of fluvial bed load is thin tailed and that the observed anomalous superdiffusion of bed load tracer…”
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The storage time, age, and erosion hazard of laterally accreted sediment on the floodplain of a simulated meandering river
Published in Journal of geophysical research. Earth surface (01-09-2013)“…A sediment particle traversing the fluvial system may spend the majority of the total transit time at rest, stored in various sedimentary deposits. Floodplains…”
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Smartrock Transport in a Mountain Stream: Bedload Hysteresis and Changing Thresholds of Motion
Published in Water resources research (01-11-2020)“…Bedload movement is fundamentally probabilistic. Our quantitative understanding of gravel transport is particularly limited when flow conditions just exceed…”
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Evolution of tributary junctions and their capacity for rearing juvenile Chinook salmon (Oncorhynchus tshawytscha) on a regulated river
Published in Ecohydrology (01-12-2022)“…The Trinity River in northern California was adjusting to unregulated flood and mining impacts when it was dammed and flow regulation began in 1960. We examine…”
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Trouble with diffusion: Reassessing hillslope erosion laws with a particle-based model
Published in Journal of Geophysical Research. B. Solid Earth (18-03-2010)“…Many geomorphic systems involve a broad distribution of grain motion length scales, ranging from a few particle diameters to the length of an entire hillslope…”
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Longitudinal Fluvial Dispersion of Coarse Particles: Insights From Field Observations and Model Simulations
Published in Water resources research (01-11-2024)“…Abstract In this study, we use field observations augmented with model simulations to examine gravel dispersion over nine years (2007–2015) in Halfmoon Creek…”
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Smartrock Transport From Seconds to Seasons: Shear Stress Controls on Gravel Diffusion Inferred From Hop and Rest Scaling
Published in Geophysical research letters (16-05-2021)“…Our ability to test probabilistic models linking clast movements to bedload diffusion is most limited by basic field data, because measuring transport…”
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Modeling sediment transport with random walks
Published 01-01-2010“…The motion of a sediment grain along the bed of a river is fundamentally a random walk. A grain moves intermittently, with an episode of motion followed by an…”
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Dissertation -
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Fractional dispersion in a sand bed river : Stochastic Transport and Emergent Scaling on Earth's Surface
Published in Journal of geophysical research (2010)Get full text
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Modeling sediment transport with random walks
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Dissertation