River bedforms arise as a result of morphological instabilities of the stream-sediment interface. Dunes and antidunes constitute the most typical patterns, and their occurrence and dynamics are relevant for a number of engineering and environmental applications. Although flow variability is a typical feature of all rivers, the bedform-triggering morphological instabilities have generally been studied under the assumption of a constant flow rate. In order to partially address this shortcoming, we here discuss the influence of (periodic) flow unsteadiness on bedform inception. To this end, our recent one-dimensional validated model coupling Dressler’s equations with a refined mechanistic sediment transport formulation is adopted, and both the asymptotic and transient dynamics are investigated by modal and nonmodal analyses.

River bedform inception by flow unsteadiness: A modal and nonmodal analysis / Caruso, Alice; Vesipa, Riccardo; Camporeale, CARLO VINCENZO; Ridolfi, Luca; Schmid, Peter J.. - In: PHYSICAL REVIEW. E. - ISSN 2470-0045. - STAMPA. - 93:5(2016). [10.1103/PhysRevE.93.053110]

River bedform inception by flow unsteadiness: A modal and nonmodal analysis

CARUSO, ALICE;VESIPA, RICCARDO;CAMPOREALE, CARLO VINCENZO;RIDOLFI, LUCA;
2016

Abstract

River bedforms arise as a result of morphological instabilities of the stream-sediment interface. Dunes and antidunes constitute the most typical patterns, and their occurrence and dynamics are relevant for a number of engineering and environmental applications. Although flow variability is a typical feature of all rivers, the bedform-triggering morphological instabilities have generally been studied under the assumption of a constant flow rate. In order to partially address this shortcoming, we here discuss the influence of (periodic) flow unsteadiness on bedform inception. To this end, our recent one-dimensional validated model coupling Dressler’s equations with a refined mechanistic sediment transport formulation is adopted, and both the asymptotic and transient dynamics are investigated by modal and nonmodal analyses.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2642897
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