Wave reworking of abandoned deltas

Jaap H. Nienhuis, Andrew D. Ashton, Pieter C. Roos, Suzanne J.M.H. Hulscher, Liviu Giosan

Research output: Contribution to journalArticleAcademicpeer-review

28 Citations (Scopus)
64 Downloads (Pure)

Abstract

River deltas and individual delta lobes frequently face reduction of sediment supply, either from the geologic process of river avulsion or, more recently, due to human activities such as river damming. Using a process-based shoreline evolution model, we investigate wave reworking of delta shorelines after fluvial input elimination. Model results suggest that littoral sediment transport can result in four characteristic modes of delta abandonment, ranging from diffusional smoothing of the delta (or delta lobe) to the development of recurved spits. A straightforward analysis of delta shape and wave characteristics provides a framework for predicting the mode of delta abandonment. The observed morphologies of historically abandoned delta lobes, including those of the Nile, Ebro, and Rhone rivers, fit within this framework. Our results provide quantitative insight into the potential evolution of active delta environments in light of future extreme reduction of fluvial sediment input.
Original languageEnglish
Pages (from-to)5899-5903
JournalGeophysical research letters
Volume40
Issue number22
DOIs
Publication statusPublished - 2013

Keywords

  • IR-90731
  • METIS-290712

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