THE EFFECTS OF SOME TERRAIN ON WIND CHARACTERISTICS IN STRONG WINDS

强风中某些地形对风特性的影响

基本信息

批准号：
09450211
负责人：
MAEDA Junji
金额：
$ 3.52万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450211/
关键词：
wind measurement wind distribution wind area measurement local wind wind tunnel test effects of terrain LSD method 局所風

项目摘要

By some wind distribution analyses using a network system of wind measurement in Kyushu, which we call NeWMeK, the following results are obtained about the effects of topography.1. The system, which can show the characteristics of the strong wind distribution in the sight, was developed utilizing the counter map of wind distribution using the observation data of 121 sites of NeWMeK. As an example of a local area where peculiar strong wind characteristics is shown, it was verified that the west district of Fukuoka City showed a strong gust factor only for the south wind direction.2. Considering the wind direction the 121 observation sites of NeWMeK are roughly classified into the following divisions according to the terrain using the digital map information data (50m mesh) : (1) flat, (2) foothill (downward), (3) foothill (upward), (4) inclined plane (downward), (5) inclined plane (upward), (6) summit of a mountain (parallel), (7) summit of a mountain (cross), (8) valley (parallel), and … More (9) valley (cross.)3. The installation altitudes of the anemometers of NeWMeK sites vary within the range of 30-190m high. To arrange the height to 30m, the correction to the wind speeds was estimated considering the terrain and the wind directions. However a big change was not seen in whole wind distribution before and after arranging the height.4. In the case that the virtual constant wind blows to the whole of Kyushu, the rate of increase of local wind were estimated by the LSD method and the map of the virtual wind distribution were visualized. It is found that the map was almost corresponding to the situations of the wind distributions at non-typhoon. However it was confirmed that this method couldn't apply to some sites.5. The aerodynamic properties of a pulse type windmill anemometer in pulsation flows using a wind tunnel is discussed. It is found that the pulsation period and the attack angles of wind influence strongly on the measured wind speeds by the pulse type windmill anemometer. It is certificated that the responsibility of the anemometer is insufficient over ten degrees of the attack angle of wind. Less

通过利用九州测风网络系统NeWMeK进行风场分布分析，得到以下有关地形影响的结果： 1．利用NeWMeK 121个地点的观测数据制作的风分布计数器地图作为显示出特殊强风特征的局部地区的例子，已验证仅福冈市西区显示出强阵风因素。为了2、考虑到风向，利用数字地图信息数据（50m网格）将NeWMeK的121个观测点按地形大致划分为：（1）平地、（2）山麓（向下））、（3）山麓（向上）、（4）斜面（向下）、（5）斜面（向上）、（6）山顶（平行）、（7）山顶（十字）、 (8) 谷(平行)、… (9) 谷(交叉) 3. NeWMeK 站点风速计的安装高度在30-190m 范围内变化，将高度调整为30m。风速是根据地形和风向进行估算的，但在布置高度前后，整个风分布没有出现大的变化。4．利用LSD方法估算了九州地区的风力增幅，并将虚拟风力分布图可视化，发现该图与非台风时的风力分布情况基本相符。 5．利用风洞研究了强脉动风车风速计的气动特性，发现脉动周期和风的迎角对气动特性的影响。脉冲式风车风速计测得的风速经证明风速计的响应度不足十度以上的风攻角。