Further remarks on a distributed approach to sediment delivery
نویسندگان
چکیده
In this paper the sediment delivery relationship, i.e. the relationship between the basin sediment delivery ratio SDRW and the sediment delivery ratio SDRj of each morphological unit, i, into which a basin is divided, is firstly tested using morphological data (length, steepness and area of each unit) from six Sicilian and three Calabrian basins. Then a coefficient a of the sediment delivery relationship is related to several channel network parameters affecting the sediment transport efficiency. Finally, the spatial distribution of Cs activity measured in a small Australian basin is used for validating the predictive capability of the proposed distributed approach to sediment delivery. Des observations complémentaires sur l'approche distribuée des processus d'apport de sédiments Résumé Dans cette note, on a d'abord établi une formule exprimant la production de sédiments, c'est à dire la relation entre le coefficient de production de sédiments à l'échelle d'un bassin complet SDRW et le coefficient de production SDRt de chacune des unités morphologiques selon lesquelles il a été divisé, en utilisant les données morphologiques (longueur, pente et aire de chacune des unités) de six bassins siciliens et trois bassins calabrais. Ensuite le coefficient a de la formule de production de sédiments a été exprimé en fonction de paramètres du réseau fluvial qui conditionnent l'efficacité du transport des sédiments. Enfin la distribution spatiale de l'activité en caesium-137, mesurée dans un petit bassin australien, a été utilisée pour établir la capacité de prévision de l'approche distribuée des processus d'apport de sédiments.
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