THE EFFECTS OF SOME TERRAIN ON WIND CHARACTERISTICS IN STRONG WINDS

通过使用九州测风网络系统NeWMeK进行的风分布分析，得到了地形影响的以下结果。该系统利用NeWMEK的121个测点的观测资料，利用风场反分布图，建立了能在视场内显示大风分布特征的系统。作为一个表现出特殊大风特征的局地个例，验证了福冈市西区仅在南风方向上表现出强风因子。考虑到风向，利用数字地图信息数据(50米网格)将新世界气象中心的121个观测点按地形大致划分为以下分区：(1)平坦、(2)丘陵(向下)、(3)丘陵(向上)、(4)斜面(向下)、(5)斜面(向上)、(6)山顶(平行)、(7)山顶(交叉)、(8)山谷(平行)和…更多(9)山谷(交叉)3.NeWMeK站点风速计的安装高度在30-190米高的范围内变化。为了将高度安排到30m，考虑到地形和风向，估计了对风速的修正。但整层高度布置前后的整体风场分布变化不大。在虚拟恒定风吹向九州全境的情况下，用LSD方法估计了局地风速的增大率，并绘制了虚拟风速分布图。结果表明，该图与非台风时的风场分布情况基本一致。但经证实，该方法不适用于部分站点。利用风洞实验研究了脉动流中脉冲式风力计的气动特性。研究发现，脉动周期和风攻角对脉冲式风速计测量风速有很大影响。结果表明，风速计的响应速度在十度以上的迎角范围内是不够的。较少

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