Enhanced sediment scavenging due to double-diffusive convection

Jeffrey D. Parsons, Marcelo Horacio Garcia

Research output: Contribution to journalArticle

Abstract

River water intruding into a lake or ocean typically results in a surface layer of warm, sediment-laden water overriding relatively dense, cold fluid. Though this system is stable with respect to density, instability may arise as a result of the different diffusivities of sediment and heat. A series of experiments were conducted which indicated that double-diffusive convection (DDC) was responsible for rapid sedimentation of slowly settling particles. A simple theory, based upon relevant physical processes, is developed that describes this behavior. It also incorporates the previously neglected effects of ambient stratification on the strength of the DDC. Application of the theory and our results to field data taken from oceanic river plumes demonstrates that the flux due to double-diffusive sedimentation (DDS) can be at least as strong as flocculationenhanced gravitational settling.

Original languageEnglish (US)
Pages (from-to)47-52
Number of pages6
JournalJournal of Sedimentary Research
Volume70
Issue number1
DOIs
StatePublished - Jan 1 2000

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convection
sedimentation
particle settling
river plume
diffusivity
sediment
river water
surface layer
stratification
fluid
lake
ocean
experiment
water
effect
physical process
cold

ASJC Scopus subject areas

  • Geology

Cite this

Enhanced sediment scavenging due to double-diffusive convection. / Parsons, Jeffrey D.; Garcia, Marcelo Horacio.

In: Journal of Sedimentary Research, Vol. 70, No. 1, 01.01.2000, p. 47-52.

Research output: Contribution to journalArticle

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