A new simple integral technique to analyze bedload transport data
Résumé
We describe a simple technique for the analysis of bed load transport data. The technique
rests on a simple Rieman sum of bed load fluxes measured against some control variable (e.g. shear stress,
discharge). We apply this technique to both natural and synthetic datasets. The natural dataset comes
from the Urumqi river survey in the Chinese Tianshan. The synthetic datasets are produced by modeling
bed load transport as a Poisson distribution whose parameter depends on shear stress only. One hundred
sets of 30, 100 and 500 measurements are produced for two sets of shear stresses, one without uncertainty
and one produced using a lognormal distribution. All together 600 synthetic surveys and corresponding
datasets are produced and fitted using the integral method and two other conventional techniques, namely
moving averages and binning. When compared to other techniques the integral presents the same
efficiency, in terms of recovering the average sediment transport law, but it presents two practical
advantages. It is not parametrized and therefore not dependent on the choice of parameters and it can be
used for small small samples when other methods fail on natural datasets.
Domaines
Géomorphologie
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