A numerical model to store and access the stratigraphy of non-cohesive sediment as an alluvial bed aggrades and degrades in a flume

E. Viparelli, O. Sequeiros, A. Cantelli, Gary Parker

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Aone-dimensional model describing bed evolution in awater-feed flume is presented.The model considers conditions of lower-regime plane bed. Sediment transport can be modeled as uniform in size or as a mixture of different grain sizes. As in some previous morphodynamic models with sediment mixtures, the active layer approximation has been introduced to describe how sediment is exchanged between the bed and the bedload. The innovative characteristic of the present model is a procedure to store the stratigraphy created by deposition, and to access this stratigraphy when the bed erodes into it. Stratigraphy is stored in a grid, and a set of grain size distributions, each associated with a different vertical position in the bed, is associated with each node in the downstream direction. When the bed degrades, the upper part of the substrate is transferred to the active layer and the number of storage sites on the vertical decreases. If the bed aggrades, part of the active layer is transferred to the substrate and the number of storage sites increases. In the present paper numerical results are presented and discussed so as to compare the approach to mobile-bed equilibrium in sediment-feed and sediment recirculating flumes. Physical experiments are currently in process in order to test the model.

Original languageEnglish (US)
Title of host publicationRiver, Coastal and Estuarine Morphodynamics
Subtitle of host publicationRCEM 2007 - Proceedings of the 5th IAHR Symposium on River, Coastal and Estuarine Morphodynamics
Pages447-455
Number of pages9
StatePublished - Dec 1 2008
Event5th IAHR-Symposium on River, Coastal and Estuarine Morphodynamics, RCEM 2007 - Enschede, Netherlands
Duration: Sep 17 2007Sep 21 2007

Publication series

NameRiver, Coastal and Estuarine Morphodynamics: RCEM 2007 - Proceedings of the 5th IAHR Symposium on River, Coastal and Estuarine Morphodynamics
Volume1

Other

Other5th IAHR-Symposium on River, Coastal and Estuarine Morphodynamics, RCEM 2007
CountryNetherlands
CityEnschede
Period9/17/079/21/07

Fingerprint

Stratigraphy
Numerical models
Sediments
stratigraphy
active layer
sediment
grain size
substrate
Sediment transport
morphodynamics
Substrates
bedload
sediment transport
experiment
Experiments

ASJC Scopus subject areas

  • Ecology
  • Environmental Engineering

Cite this

Viparelli, E., Sequeiros, O., Cantelli, A., & Parker, G. (2008). A numerical model to store and access the stratigraphy of non-cohesive sediment as an alluvial bed aggrades and degrades in a flume. In River, Coastal and Estuarine Morphodynamics: RCEM 2007 - Proceedings of the 5th IAHR Symposium on River, Coastal and Estuarine Morphodynamics (pp. 447-455). (River, Coastal and Estuarine Morphodynamics: RCEM 2007 - Proceedings of the 5th IAHR Symposium on River, Coastal and Estuarine Morphodynamics; Vol. 1).

A numerical model to store and access the stratigraphy of non-cohesive sediment as an alluvial bed aggrades and degrades in a flume. / Viparelli, E.; Sequeiros, O.; Cantelli, A.; Parker, Gary.

River, Coastal and Estuarine Morphodynamics: RCEM 2007 - Proceedings of the 5th IAHR Symposium on River, Coastal and Estuarine Morphodynamics. 2008. p. 447-455 (River, Coastal and Estuarine Morphodynamics: RCEM 2007 - Proceedings of the 5th IAHR Symposium on River, Coastal and Estuarine Morphodynamics; Vol. 1).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Viparelli, E, Sequeiros, O, Cantelli, A & Parker, G 2008, A numerical model to store and access the stratigraphy of non-cohesive sediment as an alluvial bed aggrades and degrades in a flume. in River, Coastal and Estuarine Morphodynamics: RCEM 2007 - Proceedings of the 5th IAHR Symposium on River, Coastal and Estuarine Morphodynamics. River, Coastal and Estuarine Morphodynamics: RCEM 2007 - Proceedings of the 5th IAHR Symposium on River, Coastal and Estuarine Morphodynamics, vol. 1, pp. 447-455, 5th IAHR-Symposium on River, Coastal and Estuarine Morphodynamics, RCEM 2007, Enschede, Netherlands, 9/17/07.
Viparelli E, Sequeiros O, Cantelli A, Parker G. A numerical model to store and access the stratigraphy of non-cohesive sediment as an alluvial bed aggrades and degrades in a flume. In River, Coastal and Estuarine Morphodynamics: RCEM 2007 - Proceedings of the 5th IAHR Symposium on River, Coastal and Estuarine Morphodynamics. 2008. p. 447-455. (River, Coastal and Estuarine Morphodynamics: RCEM 2007 - Proceedings of the 5th IAHR Symposium on River, Coastal and Estuarine Morphodynamics).
Viparelli, E. ; Sequeiros, O. ; Cantelli, A. ; Parker, Gary. / A numerical model to store and access the stratigraphy of non-cohesive sediment as an alluvial bed aggrades and degrades in a flume. River, Coastal and Estuarine Morphodynamics: RCEM 2007 - Proceedings of the 5th IAHR Symposium on River, Coastal and Estuarine Morphodynamics. 2008. pp. 447-455 (River, Coastal and Estuarine Morphodynamics: RCEM 2007 - Proceedings of the 5th IAHR Symposium on River, Coastal and Estuarine Morphodynamics).
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