Wind Profiles in a Coastal Forest of Japanese Black Pine (Pinus thunbergii Parl.) with Different Thinning Intensities

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概要

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• Simultaneous measurements of windspeed were made outside and inside a pine (Pinus thunbergii Parl.) coastal forest with different thinning intensities. Synchronously, optical stratification porosity (OSP), which is defined as vertical distribution of the proportion of sky hemisphere not obscured by tree elements inside a forest stand, was estimated using hemispherical silhouettes in each treatment area. Based on the observations, the frequency distribution of velocity, turbulence intensity, wind profile, and the corresponding relationships of these respective parameters with the vertical forest structure (OSP) were examined and compared among the treatment areas. A normal distribution of wind velocity was observed at the lower zone of the forest stand in all treatment areas. The turbulence intensity, the highest value of which was found near the canopy, changed greatly with height, wind velocity, and treatment, and decreased with windspeed and increased with the thinning intensity. It was found that the exponential relationship between windspeed and height could be used to describe the wind profiles within the canopy of the coastal forest. The results demonstrate that the attenuation coefficient of the wind profile corresponds to the grade of thinning intensities. The wind patterns in a coastal forest with different thinning intensities are related to the vertical forest structure, particularly, wind profiles within the canopy are closely correlated with the distribution of OSP. The results indicate wind profiles profiles can be estimated simply based on the measurement of OSP with a very high coefficient of determination. Reciprocally, the estimation of OSP can also be obtained from the measurement of wind profile.

• 一般社団法人日本森林学会の論文
• 2001-11-16

著者

• GONDA Yutaka

  Faculty of Agriculture, Niigata University

• Gonda Yutaka

  Faculty Of Agriculture Niigata University

• Zhu Jiaojun

  Graduate School of Science and Technology, Faculty of Agiculture, Niigata University

• Matsuzaki Takeshi

  Graduate School of Science and Technology, Faculty of Agiculture, Niigata University

• Gonda Yutaka

  Graduate School of Science and Technology, Faculty of Agiculture, Niigata University

• MATSUZAKI Takeshi

  Faculty of Agriculture, Niigata University

• Zhu Jiaojun

  Graduate School Of Science And Technology Nigata University

• Matsuzaki T

  Yakult Central Inst. Microbiological Res. Kunitachi Jpn

関連論文

• Effects of flooding and artificial burning disturbances on plant species composition in a downstream riverside floodplain
• Wind Profiles in a Coastal Forest of Japanese Black Pine (Pinus thunbergii Parl.) with Different Thinning Intensities
• Extreme wind over a pine coastal forest established for sand-control at Aoyama of Niigata in Japan

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