Urban Meteorological Approach for Localized Heavy Rainfall

为了提高城市降水局部预报的准确性，本项目采用了城市气象学方法，取得了以下成果：（1）使用非常详细的城市GIS数据库进行调查，发现沿着东京练马琦玉线存在“微风停滞区”。（高精度湍流模拟）推导出一种新的空气动力学参数化真实的城市表面，（3）采用最先进的城市地面参数化方法进行的中尺度天气模拟表明，城市化增强了局地降水强度。

In order to improve the accuracy of localized urban rainfall prediction, this project used urban meteorological approaches and obtained the following results; (1) investigations using very detailed urban GIS database revealed the existence of “see breeze stagnant region” along Tokyo-Nerima-Saitama line, (2) Large Eddy Simulation (highly accurate turbulence simulation) derived a new aerodynamic parameterization for real urban surfaces, and (3) meso-scale weather simulations with the most advanced urban surface parameterization demonstrated that the urbanization strengthened localized rainfall intensity.