Relationships between hydraulic parameters in a small stream under varying flow and seasonal conditions

D. R. Hart, P. J. Mulholland, E. R. Marzolf, D. L. DeAngelis, S. P. Hendricks

Research output: Contribution to journalArticle

59 Scopus citations

Abstract

Twenty conservative tracer injections were carried out in the same reach of a small woodland stream in order to determine how variation in discharge and leaf accumulation affect stream hydraulic parameters. The injections were made at various discharge rates ranging from 2-6 to 40 1/s. Five of the injections were made during late autumn, when there were large accumulations of leaves in the stream. Estimates of hydraulic parameters were made by fitting a transient storage solute transport model to conservative tracer concentration profiles. Velocity increased almost linearly with increasing discharge, indicating a decline in the Darcy friction factor. Dispersion also increased with increasing discharge, especially for the lower flow injections. The relative size of the storage zone was small (∼0·1). There was no definable relationship between discharge and the relative storage zone size, but the rates of exchange between the storage zone and the main channel increased markedly with increasing discharge. The presence of large accumulations of leaves had a clear effect on the hydraulic characteristics of the stream, producing much higher friction factors, larger storage zone sizes and lower velocity than would have been predicted by discharge alone.

Original languageEnglish (US)
Pages (from-to)1497-1510
Number of pages14
JournalHydrological Processes
Volume13
Issue number10
DOIs
StatePublished - Jan 1 1999

Keywords

  • Hyporheic zone
  • Longitudinal dispersion
  • Solute transport
  • Stream hydraulic parameters
  • Transient storage

ASJC Scopus subject areas

  • Water Science and Technology

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