Modeling stratigraphy formed by prograding Gilbert deltas

E. Viparelli, A. Blom, Gary Parker

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

Abstract

A numerical model that predicts the stratigraphy of a prograding Gilbert delta is presented. Such a Gilbert delta is formed when a river is flowing into a deep basin and the sediment transported by the river downstream avalanches downa steep slope.These deltas are characterized by thin and relatively low-slope topsets, steep foresets (the prograding slip faces), and thin, fine-grained bottomsets. Bedforms such as dunes, bars and Gilbert deltas prograde through avalanching of sediment down the slip face, in which a vertical sorting pattern develops, with the coarser sediment preferentially deposited at lower elevations. We describe the stratigraphy formed by such a prograding delta in case of a variable base level by coupling the Hirano active layer model for the topset to a lee face-sorting model for the foreset. Numerical simulations are performed at laboratory scale. Base level varies as a cosine function with constant amplitude and variable frequency, so representing cycles of base level. The main result is that low-frequency oscillations of base level are recorded in the stratigraphy of a Gilbert delta, which offers possibilities for future interpretations of base level variations from measured stratigraphy.

Original languageEnglish (US)
Title of host publicationRiver Flow 2012 - Proceedings of the International Conference on Fluvial Hydraulics
Pages827-836
Number of pages10
StatePublished - Nov 1 2012
EventInternational Conference on Fluvial Hydraulics, River Flow 2012 - San Jose, Costa Rica
Duration: Sep 5 2012Sep 7 2012

Publication series

NameRiver Flow 2012 - Proceedings of the International Conference on Fluvial Hydraulics
Volume1

Other

OtherInternational Conference on Fluvial Hydraulics, River Flow 2012
CountryCosta Rica
CitySan Jose
Period9/5/129/7/12

Fingerprint

Stratigraphy
stratigraphy
Sediments
Sorting
modeling
Rivers
sorting
Catchments
sediment
Numerical models
active layer
bedform
avalanche
river
dune
Computer simulation
oscillation
basin
simulation

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Geotechnical Engineering and Engineering Geology

Cite this

Viparelli, E., Blom, A., & Parker, G. (2012). Modeling stratigraphy formed by prograding Gilbert deltas. In River Flow 2012 - Proceedings of the International Conference on Fluvial Hydraulics (pp. 827-836). (River Flow 2012 - Proceedings of the International Conference on Fluvial Hydraulics; Vol. 1).

Modeling stratigraphy formed by prograding Gilbert deltas. / Viparelli, E.; Blom, A.; Parker, Gary.

River Flow 2012 - Proceedings of the International Conference on Fluvial Hydraulics. 2012. p. 827-836 (River Flow 2012 - Proceedings of the International Conference on Fluvial Hydraulics; Vol. 1).

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

Viparelli, E, Blom, A & Parker, G 2012, Modeling stratigraphy formed by prograding Gilbert deltas. in River Flow 2012 - Proceedings of the International Conference on Fluvial Hydraulics. River Flow 2012 - Proceedings of the International Conference on Fluvial Hydraulics, vol. 1, pp. 827-836, International Conference on Fluvial Hydraulics, River Flow 2012, San Jose, Costa Rica, 9/5/12.
Viparelli E, Blom A, Parker G. Modeling stratigraphy formed by prograding Gilbert deltas. In River Flow 2012 - Proceedings of the International Conference on Fluvial Hydraulics. 2012. p. 827-836. (River Flow 2012 - Proceedings of the International Conference on Fluvial Hydraulics).
Viparelli, E. ; Blom, A. ; Parker, Gary. / Modeling stratigraphy formed by prograding Gilbert deltas. River Flow 2012 - Proceedings of the International Conference on Fluvial Hydraulics. 2012. pp. 827-836 (River Flow 2012 - Proceedings of the International Conference on Fluvial Hydraulics).
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