Spreading of gravity plumes on an incline

Sung Uk Choi, Marcelo H. Garcia

Research output: Contribution to journalArticle

Abstract

Gravity plumes are buoyancy-driven underflows in a deep ambient fluid. We develop spreading laws for gravity plumes which propagate laterally as well as longitudinally on a uniform slope. Examples of such flows are turbidity currents in the ocean and ignimbrite flows in the atmosphere. Laboratory experiments with a large tank, employing saline density currents, coupled with dimensional analysis, have been used to develop simple expressions for spreading rates of three-dimensional flows on sloping beds. Characteristic length and time are determined by the flow discharge and the buoyancy flux at the inlet. By knowing the initial width of the flow, the spreading laws can be used to estimate the maximum width of the current at different times as well as the longitudinal spreading rate. Predictions for flows compare favorably against observations.

Original languageEnglish (US)
Pages (from-to)221-237
Number of pages17
JournalCoastal Engineering Journal
Volume43
Issue number4
DOIs
StatePublished - Dec 2001

Keywords

  • Density current
  • Spreading rate
  • Turbid underflow
  • Turbidity current

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Modeling and Simulation
  • Ocean Engineering

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