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Turbulens och supraglacial meandring

Carlsson, Gustav (1997) In Lunds universitets Naturgeografiska institution - Seminarieuppsatser
Dept of Physical Geography and Ecosystem Science
Abstract
The fieldwork was carried out on Bas Glacier d'Arolla during two days in August 1996. The aim of the study was to verify the existence of a relationship between turbulence and meander geometry according to the theory of Yalin (1992). Turbulence was measured by recording temperature fluctuations in one straight section and one curved section of the supraglacial stream. Temperature series was interpreted by frequency analysis.
Peaks of the same frequency were found in the frequency diagrams obtained from the different measuring points recorded at the same time. The inverse frequency or period is used to calculate the estimated meander wavelength. It was indicated that the estimated meander wavelength was well in accordance with the true... (More)
The fieldwork was carried out on Bas Glacier d'Arolla during two days in August 1996. The aim of the study was to verify the existence of a relationship between turbulence and meander geometry according to the theory of Yalin (1992). Turbulence was measured by recording temperature fluctuations in one straight section and one curved section of the supraglacial stream. Temperature series was interpreted by frequency analysis.
Peaks of the same frequency were found in the frequency diagrams obtained from the different measuring points recorded at the same time. The inverse frequency or period is used to calculate the estimated meander wavelength. It was indicated that the estimated meander wavelength was well in accordance with the true meander wavelength.
The validity of a theory of minimum entropy production by river meandering was tested for meandering streams on ice. It was found that the "law of least time rate of energy expenditure" presented by Yang (1971) is not applicable on supraglacial streams. (Less)
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author
Carlsson, Gustav
supervisor
organization
year
type
H1 - Master's Degree (One Year)
subject
keywords
geografi, naturgeografi, turbulens, supraglacial, meandring
publication/series
Lunds universitets Naturgeografiska institution - Seminarieuppsatser
report number
47
language
Swedish
id
2027103
date added to LUP
2011-11-23 10:59:07
date last changed
2011-11-23 10:59:07
@misc{2027103,
  abstract     = {The fieldwork was carried out on Bas Glacier d'Arolla during two days in August 1996. The aim of the study was to verify the existence of a relationship between turbulence and meander geometry according to the theory of Yalin (1992). Turbulence was measured by recording temperature fluctuations in one straight section and one curved section of the supraglacial stream. Temperature series was interpreted by frequency analysis.
Peaks of the same frequency were found in the frequency diagrams obtained from the different measuring points recorded at the same time. The inverse frequency or period is used to calculate the estimated meander wavelength. It was indicated that the estimated meander wavelength was well in accordance with the true meander wavelength.
The validity of a theory of minimum entropy production by river meandering was tested for meandering streams on ice. It was found that the "law of least time rate of energy expenditure" presented by Yang (1971) is not applicable on supraglacial streams.},
  author       = {Carlsson, Gustav},
  keyword      = {geografi,naturgeografi,turbulens,supraglacial,meandring},
  language     = {swe},
  note         = {Student Paper},
  series       = {Lunds universitets Naturgeografiska institution - Seminarieuppsatser},
  title        = {Turbulens och supraglacial meandring},
  year         = {1997},
}