大気不安定時の接地境界層流れの鉛直プロファイル特性について

栗田 剛; 大場 正昭

doi:10.14887/kazekosymp.20.0.2.0

PROCEEDINGS OF THE 20th NATIONAL SYMPOSIUM ON WIND ENGINEERING

DOI https://doi.org/10.14887/kazekosymp.20.0.2.0

Conference information

Co-host: The Institute of Electrical Engineering of Japan, Japanese Society of Steel Construction, Japan Society of Civil Engineers, Meteorlological Society of Japan, Architectural Institute of Japan, Japan Association for Wind Engineering

Characteristics of vertical profiles on unstable boundary layerflow

*Tsuyoshi Kurita, Masaaki Ohba

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Keywords: Turbulent flux, Vertical profile, Monin-Obukhov length, Roughness length for heat and momentum, Roughness Reynolds number

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Abstract

The flow and temperature characteristics within an unstable surface boundary layer were determined using a hot-wire anemometer and a cold-wire thermometer. Results of experiments on the unstable surface boundary layer flow showed that the peak frequency of power spectrum density in instability was shifted more toward the low-frequency side than in the neutral condition. The co-spectra of heat flux had similar tendencies to the results of Kaimal. The logarithm of the ratio between roughness lengths for momentum and heat showed similar results to those which were obtained from field observation in grass plain fields by Brutseart.

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