Logarithmic matching and its applications in computational hydraulics and sediment transport

Junke Guo

Research output: Contribution to journalArticlepeer-review

89 Scopus citations


This study presents an asymptotic matching method, the logarithmic matching. It states that for a complicated nonlinear problem or an experimental curve, if one can find two asymptotes, in extreme cases, which can be expressed as logarithmic or power laws, then the logarithmic matching can merge the two asymptotes into a single composite solution. The applications of the logarithmic matching have been successfully tried in several cases in open-channel flows, coastal hydrodynamics and sediment transport such as: 1) the inverse problem of Manning equation in rectangular open-channels, 2) the connection of different laws in computational hydraulics, 3) the solution of linear wave dispersion equation, 4) criterion of wave breaking, 5) wave-current turbulence model, 6) sediment settling velocity, 7) velocity profiles of sediment-laden flows, and 8) sediment transport capacity. All these applications agree very well with numerical solutions or experimental data. Besides, it is pointed out that there are several other cases where the logarithmic matching has potential applications.

Original languageEnglish (US)
Pages (from-to)555-565
Number of pages11
JournalJournal of Hydraulic Research
Issue number5
StatePublished - 2002
Externally publishedYes


  • Asymptotic matching
  • Computational hydraulics
  • Linear wave
  • Logarithmic law
  • Power law
  • Sediment settling velocity
  • Sediment transport
  • Velocity profiles
  • Wave breaking
  • Wave-current turbulence

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Water Science and Technology


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