Titre :

Scaling properties of the turbidity and streamflow time series at two different locations of an intra-Apennine stream: Case study

Auteur(s) :

Pelacani, Samanta [Auteur]
Schmitt, Francois G. [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]

Titre de la revue :

Journal of Hydrology

Éditeur :

Elsevier

Date de publication :

2021

ISSN :

0022-1694

Mot(s)-clé(s) en anglais :

Suspended sediment transport
Spectral analysis
Scaling
Fractional integration
Delay time
Bilancino watershed
Italy

Discipline(s) HAL :

Planète et Univers [physics]

Résumé en anglais : [en]

The time scales of a catchment hydrologic response in a human impacted intra-Apennine basin, was assessed by a power spectral analysis. Turbidity and streamflow data, at high resolution (10 min) have been considered during ...
Lire la suite >The time scales of a catchment hydrologic response in a human impacted intra-Apennine basin, was assessed by a power spectral analysis. Turbidity and streamflow data, at high resolution (10 min) have been considered during four years. The turbidity and streamflow have heavy tails that follow approximately Pareto distributions. Both also display scaling Fourier power spectra of the form f<SUP>-b</SUP>, over different scaling ranges: from 10 min to one day for the turbidity and from 1 h to 20 days for the streamflow data. For both locations the slope for the streamflow is close to b = 1.7, whereas for turbidity the values b = 1.68 and 2.25 are found for the upstream and downstream locations, respectively. The turbidity dataset at the downstream station has a steeper slope than the upstream station, implying a higher persistence of the turbidity fluctuations: this change of slope shows that the effect of the river channel and catchment is similar to a fractional integration from the upstream to the downstream data. Furthermore, the delay times of the turbidity dataset, and hence of suspended sediment, were calculated using a co-spectrum between the series and indicating characteristic transit times of 25 days and 145 days.Lire moins >

Langue :

Anglais

Vulgarisation :

Non

Collections :

• Laboratoire d'Océanologie et de Géosciences (LOG) - UMR 8187

Source :

Harvested from HAL