Investigation on the generation and evolution mechanisms of tidal wave, tornadoes and building damages associated with the "Typhoon 9918"

1999年9月下旬，日本遭到袭击，被命名为“台风9918”。它记录了66.2米/秒的最大实际风速（在鹿儿岛上游的83.9米/秒），并导致了更大的干扰。完整和半摧毁的房屋数目为1，300座，总的房屋损坏数目包括一座超过30，000座的部分摧毁的房屋。它是由潮汐波从强风吹到亚图什罗海沿海地区的死亡折磨到19岁的。在增补中，龙卷风在与台风在东海市的并发中破裂，其环绕位于距台风中心东约700公里处，还有300多人严重或轻微地受到了伤害。目前的研究项目旨在揭示与台风有关的潮汐波和龙卷风的产生和进化机制以及房屋损害机制对整个房屋的影响。强劲的风。首先，在打字机上的记录 ... More 建筑物和海墙的风力和气象参数以及相关的潮汐波、龙卷风和损伤已经收集和分析，以揭示这些严重风暴和损伤的产生和演变的机制。第二次，数字模拟是为台风和相关的潮汐波和龙卷风而制作的;作为潮汐波，数据分析，与数字模拟和比较，在“台风9119”的情况下，它走了几乎相同的路径，它揭示了大表面上的强风。（约700公里）和由Yatsushiro Sea生成和维护的潮汐波浪沿最坏路径和浅深度的台风驱动的低压力，是什么让人想到了秋天潮汐的每日高潮，并导致了海浪和严重破坏的洪水？在增加了狭窄的海洋背面的边缘，通过回收也贡献了增强潮汐波，这就是海底地形和海岸线的变形也是原因。作为对龙卷风的原因，它展示了数字模型可以预测地成功地实现了中间尺度累积吸收和风暴的产生和持久性，以及非常高的电压，因此龙卷风形成的可能性。在日本，龙卷风预报系统还没有得到证实。However，目前的研究建议了Tornado强迫症的可能性。Less（低）

A typhoon named 'Typhoon 9918' attacked Japan in late September, 1999. It recorded the maximum instantaneous wind speed of 66.2m/sec (informally 83.9m/sec at Kashima in Kagoshima Prefecture) and caused extensive damages. The number of completely- and half-destroyed houses was 1,300 and the total number of house damage including partly-destroyed one amounted to more than 30,000. It was characterized by the tidal wave due to the strong wind from which the death toll climbed to 19 in the coastal region of the Yatsushiro Sea. In addition, Tornadoes broke out in concurrent with the typhoon in City of Toyohashi and its surroundings located about 700km east from the center of the typhoon, and more than 300 pupils were injured either seriously or slightly.The present research project was aimed to disclose the generation and evolution mechanisms of the tidal wave and tornadoes associated with the typhoon and the mechanism of the house damage due to the strong wind. At first, records on the typh … More oon and meteorological paremeters and the associated tidal wave, tornadoes and damages of buildings and seawalls were collected and analyzed to reveal the mechanisms of generation and evolution of these severe storms and damages. Secondly, numerical simulations were made for the typhoon and the associated tidal wave and tornadoes.As to the tidal wave, the data analyses, together with the numerical simulation and comparison with the case of the 'Typhoon 9119' that took almost the same path, revealed that the strong wind over the large surface area (about 700kmィイD12ィエD1) and the low pressure driven by the typhoon along the worst path and the shallow depth of the Yatsushiro Sea generated and maintained the tidal wave, which conspired on the diurnal high tide of autumn tide, and caused flooding over the seawall and severe damages. In addition the narrow back end of the sea straitened by reclaim also contributed to amplify the tidal wave, that is, deformation of the seabed topography and coast line is also the reason.As to the tornadoes, it was shown that the numerical model can predict successfully the generation and persistence of the mesoscale cumulous convection and thunderstorm with very high vorticity, and so the possibility of the tornado formation. In Japan the tornado forecasting system has not be established. However, the present study suggested the possibility of the tornado forcasting. Less