LiDARによる山岳地形における風速鉛直プロファイル分析

Abstract

Wind turbines are often constructed in mountainous region in Japan, because mountainous region is account for more than 70 percent of land in Japan. In complex terrains, wind characteristics depend heavily on wind direction with strong locality. Especially the vertical wind profiles are complicated in the complex terrain. So It is necessary to measure the wide-ranging wind conditions from a low altitude to a high altitude. However, wide-ranging wind measurements are difficult for conventional equipment such as meteorological mast. Then, remote sensing devices such as Light Detection and Ranging (LiDAR) are counted on for wind measurements in complex terrain. In this paper, we investigated the effects of terrain configurations on vertical wind speed profiles by wind measurements using LiDAR in mountainous terrain, and we also investigated LiDAR measurements validity by comparison among vertical profiles from three LiDARs that have different wind measurements mechanism. The trends of vertical wind speed profiles from different LiDARs are similar and the wind profiles are different by wind directions (NNW and SE). NNW wind is the flow that do not over a ridge of the mountain and SE wind is the flow that over the ridge. The NNW wind profile is uniform, and the SE wind profile is separated flow. By using LiDAR, it is able to research condition of flow in mountainous terrain such as separated flow.