Nonlinear empirical modeling to estimate phosphorus exports using continuous records of turbidity and discharge - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Water Resources Research Année : 2017

Nonlinear empirical modeling to estimate phosphorus exports using continuous records of turbidity and discharge

Résumé

We tested an empirical modeling approach using relatively low‐cost continuous records of turbidity and discharge as proxies to estimate phosphorus (P) concentrations at a subhourly time step for estimating loads. The method takes into account nonlinearity and hysteresis effects during storm events, and hydrological conditions variability. High‐frequency records of total P and reactive P originating from four contrasting European agricultural catchments in terms of P loads were used to test the method. The models were calibrated on weekly grab sampling data combined with 10 storms surveyed subhourly per year (weekly+ survey) and then used to reconstruct P concentrations during all storm events for computing annual loads. For total P, results showed that this modeling approach allowed the estimation of annual loads with limited uncertainties (≈ −10% ± 15%), more reliable than estimations based on simple linear regressions using turbidity, based on interpolated weekly+ data without storm event reconstruction, or on discharge weighted calculations from weekly series or monthly series. For reactive P, load uncertainties based on the nonlinear model were similar to uncertainties based on storm event reconstruction using simple linear regression (≈ 20% ± 30%), and remained lower than uncertainties obtained without storm reconstruction on weekly or monthly series, but larger than uncertainties based on interpolated weekly+ data (≈ −15% ± 20%). These empirical models showed we could estimate reliable P exports from noncontinuous P time series when using continuous proxies, and this could potentially be very useful for completing time‐series data sets in high‐frequency surveys, even over extended periods.
Fichier principal
Vignette du fichier
Water Resources Research - 2017 - Minaudo - Nonlinear empirical modeling to estimate phosphorus exports using continuous.pdf (1.5 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-02377287 , version 1 (16-06-2022)

Licence

Copyright (Tous droits réservés)

Identifiants

Citer

Camille Minaudo, Rémi Dupas, Chantal Gascuel, Ophélie Fovet, Per-Erik Mellander, et al.. Nonlinear empirical modeling to estimate phosphorus exports using continuous records of turbidity and discharge. Water Resources Research, 2017, 53 (9), pp.7590--7606. ⟨10.1002/2017WR020590⟩. ⟨hal-02377287⟩
115 Consultations
34 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More