山岳地における風の分布と乱流特性(第2報)

Abstract

山岳地における風の乱流特性とその水平分布を調べるために, ほぼ東西に延びる稜線の少し北に設置されている試験送電線(敦賀試験線)で観測を行った。試験線に沿った分布の平均として南風よりも平均風速が強い北風においては, 乱れの積分スケールとスペクトルピークの波長が大きくなっている。また水平分布についても, スペクトルピークの波長が大きい場所は平均風速が強く, 風向方向の乱れの積分スケールが大きい。

Turbulence characteristics of wind and their spatial distributions over the mountainous region are investigated. Field observations of velocity fluctuations were made along the test power transmission line (Tsuruga Test Line).This test line is located a little north of a ridge line which runs roughly along the west-east direction. In relation to the stronger mean wind speed, the integral scales of turbulence and the spectral peak of the wavelength for the north wind are larger than those for the south wind. The spectral peak of the wavelength is large in the location along the test line where the mean wind speed is strong and the longitudinal integral scale of turbulence is large.