HYDRAULIC GEOMETRY OF ACTIVE GRAVEL RIVERS

Research output: Contribution to journalArticle

Abstract

The hydraulic geometry of straight reaches of wide, active rivers with beds and banks composed of loose gravel is considered. Naive mechanistic formulations lead to the stable channel paradox; stable width is incompatible with an active bed. A resolution of the paradox based on bed stress redistribution due to turbulent lateral transfer of downstream momentum is outlined and is used to obtain three rationally derived regime relations. These dimensionless relations provide channel properties as functions of bed pavement size and two specified variables, e. g. , water and sediment discharge, or water discharge and width. Reduction to relations for hydraulic geometry is shown to require information concerning watershed mechanics that is external to the river, and thus fluvially indeterminate. An empirical relation is determined for this purpose, allowing for derivation of dimensionless relations for hydraulic geometry.

Original languageEnglish (US)
Pages (from-to)1185-1201
Number of pages17
JournalASCE J Hydraul Div
Volume105
Issue number9
StatePublished - Sep 1979
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

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