LCZO -- Sediment Transport -- Mameyes Watershed -- (2010-2012)
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| Owners: | CZO LuquilloCZO National |
| Type: | Resource |
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| Created: | Nov 19, 2019 at 2:19 a.m. |
| Last updated: | Jun 17, 2020 at 6:01 p.m. |
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Abstract
Radio Frequency Identification tagged cobble survey data from the Rio Mameyes .
Tagged tracers with positions overtime. Additional documentation is presented within the dataset file.
Sediment transport is an intrinsically stochastic process, and measurement of bed load in the environment is further complicated by the unsteady nature of river flooding. Here we present a methodology for analyzing sediment tracer data with unsteady forcing. We define a dimensionless impulse by integrating the cumulative excess shear velocity for the duration of measurement, normalized by grain size. We analyze the dispersion of a plume of cobble tracers in a very flashy stream over two years. The mean and variance of transport distance collapse onto well-defined linear and power-law relations, respectively, when plotted against cumulative dimensionless impulse. Data suggest that the asymptotic limit of bed load tracer dispersion is super diffusive, in line with a broad class of geophysical flows exhibiting strong directional asymmetry (advection), thin-tailed step lengths and heavy-tailed waiting times. The impulse framework justifies the use of quasi-steady flow approximations for long-term river evolution modeling.
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| Start Date: | 05/28/2010 |
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| End Date: | 06/20/2012 |
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| This resource is referenced by | Phillips, C. B., R. L., Martin, and D. J., Jerolmack (2013) Impulse framework for unsteady flows reveals super-diffusive bed load transport, Geophysical Research Letters. DOI:10.1002/grl.50323 |
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