Future Change to Tide-Influenced Deltas

Jaap H. Nienhuis*, A.J.F. Hoitink, Torbjörn E. Törnqvist

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

14 Citations (Scopus)

Abstract

Tides tend to widen deltaic channels and shape delta morphology. Here we present a predictive approach to assess a priori the effect of fluvial discharge and tides on deltaic channels. We show that downstream channel widening can be quantified by the ratio of the tide-driven discharge and the fluvial discharge, along with a second metric representing flow velocities. A test of our new theory on a selection of 72 deltas globally shows good correspondence to a wide range of environments, including wave-dominated deltas, river-dominated deltas, and alluvial estuaries. By quantitatively relating tides and fluvial discharge to delta morphology, we offer a first-order prediction of deltaic change that may be expected from altered delta hydrology. For example, we expect that reduced fluvial discharge in response to dam construction will lead to increased tidal intrusion followed by enhanced tide-driven sediment import into deltas, with implications for navigation and other human needs.

Original languageEnglish
Pages (from-to)3499-3507
JournalGeophysical Research Letters
Volume45
Issue number8
DOIs
Publication statusPublished - 28 Apr 2018

Keywords

  • channel width
  • estuary
  • river delta
  • tides

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