Webbläsaren som du använder stöds inte av denna webbplats. Alla versioner av Internet Explorer stöds inte längre, av oss eller Microsoft (läs mer här: * https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Var god och använd en modern webbläsare för att ta del av denna webbplats, som t.ex. nyaste versioner av Edge, Chrome, Firefox eller Safari osv.

Default user image.

Anders Lindroth

Professor emeritus

Default user image.

Turbulence characteristics and dispersion in a forest - tests of Thomson's random-flight model

Författare

  • Meelis Mölder
  • L Klemedtsson
  • Anders Lindroth

Summary, in English

A dispersion experiment, where the tracer SF6 Was released from line sources, was carried out within a young pine forest. Line sources made of silicone tubes were installed at different heights and distances from a tower. Vertical concentration profiles were measured on the tower and the samples were analysed with a gas chromatograph. The measured concentration profiles were compared to those calculated using Thomson's random-flight model. To provide input information to the model on turbulence, the turbulence characteristics were measured at four different heights with sonic anemometers. Data are presented for standard deviations of the velocity components, the momentum flux, the Lagrangian time scale and the mean horizontal wind velocity, depending on height and thermal stability. The derived turbulence characteristics resemble previous results in the literature; but are still stand specific. Satisfactory agreement was obtained between the measured and simulated SF6 concentration profiles. However, the model clearly underestimates the concentrations in the upper part of the stand. The results should add more confidence to the continued use of Thomson's model and are useful for planning better dispersion experiments. (C) 2004 Elsevier B.V. All rights reserved.

Avdelning/ar

  • Institutionen för naturgeografi och ekosystemvetenskap

Publiceringsår

2004

Språk

Engelska

Sidor

203-222

Publikation/Tidskrift/Serie

Flux and Concentration Footprints (Agricultural and Forest Meteorology)

Volym

127

Issue

3-4

Dokumenttyp

Konferensbidrag

Förlag

Elsevier

Ämne

  • Physical Geography

Nyckelord

  • line source
  • footprint
  • velocity standard deviation
  • pine forest
  • Lagrangian time scale
  • experiment
  • tracer

Conference name

Flux and Concentration Footprints

Conference date

2003-05-26 - 2003-05-28

Conference place

Juupajoki, Finland

Aktiv

Published

ISBN/ISSN/Övrigt

  • ISSN: 0168-1923