A comparison of methods for estimating aerodynamic resistance of heather (calluna vulgaris (L.) hull) in the field

J. S. Wallace, C. R. Lloyd, John Roberts, W. J. Shuttleworth

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

This paper presents measurements of rav the aerodynamic resistance to water transfer for heather moorland in North Yorkshire, Gt. Britain. Values of rav obtained by measuring the evaporation from a weighing lysimeter after rain vary inversely with wind-speed and are consistent with a simple theoretical description in which the zero plane displacement and roughness length are respectively 0.63 and 0.13 of the vegetation height. Estimates of rav obtained by applying a theoretical 'bluff body' correction to momentum transfer resistance, measured directly using the eddy correlation technique, have a similar wind-speed dependence but are significantly higher. The difference is shown to have little effect in models of long term evaporation from heather, so that a simple expression of the form rav = 140/u may be adequate in models which predict the evaporative response to a change in land use in heather catchments.

Original languageEnglish (US)
Pages (from-to)289-305
Number of pages17
JournalAgricultural and Forest Meteorology
Volume32
Issue number3-4
DOIs
StatePublished - Sep 1984

ASJC Scopus subject areas

  • Forestry
  • Global and Planetary Change
  • Agronomy and Crop Science
  • Atmospheric Science

Fingerprint Dive into the research topics of 'A comparison of methods for estimating aerodynamic resistance of heather (calluna vulgaris (L.) hull) in the field'. Together they form a unique fingerprint.

  • Cite this