Co-evolving delta faces under the condition of a moving sediment source

Rocío Luz Fernandez, Genevieve Cauchon-Voyer, Jacques Locat, Hsi Heng Dai, Marcelo H. Garcia, Gary Parker

Research output: Contribution to journalArticle

Abstract

A fan delta developed under the constraints of a moving point of flow-sediment supply is described. The sediment mixtures used in the experiments were chosen to approximate field conditions, with the coarser fractions depositing to form the topset (subaerial delta surface) and foreset, and the finer fractions forming a turbidity current that plunges near the shoreline, overrides the foreset, and continues into deeper water to emplace a bottomset. The migration rate of the feed point was adjusted so that the base of the lateral foreset along one side just touched the flume wall, so leaving open water on that side. The experiments provide insight into the sedimentation processes associated with these three co-evolving structures of the delta, i.e. its topset, foreset, and bottomset. The results indicate that the lateral delta extent can be controlled via the downstream migration of its sediment source.

Original languageEnglish (US)
Pages (from-to)42-54
Number of pages13
JournalJournal of Hydraulic Research
Volume49
Issue number1
DOIs
StatePublished - Feb 1 2011

Keywords

  • Fan delta
  • foreset slope
  • physical model
  • progradation
  • tailings
  • turbidity current

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Water Science and Technology

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