Development study of new criteria of wind environment on the Sea of Japan side that is prevailing seasonal wind in winter

这项研究是通过提出新的风环境标准来描述的。本研究采用实地调查、问卷调查和风洞实验相结合的方法对新泻市进行了风环境评价，由于与太平洋侧相比，受冬季季风的影响，日本海一侧大风的吹动频率较大，因此很难对日本海一侧采用通常的标准。风速加快了街道上两栋住宅之间的水流和屋顶上的剥落水流。无论是现场测量、风洞实验还是数值分析，这都是显而易见的事实。通过对居民的问卷调查，当他们难以撑起伞时，他们感受到了大风。当他们走路有困难时，会给风带来不舒服的感觉。新的风环境标准的允许范围比东京更大，对日最大力矩风10m/S、15m/S、超过20m/S的风的允许天数分别为102天、21天和4天。它适应了适用的居住区，在风环境为3级弧形之前设置防风林，之后设置防风林时，环境评价降至2级或1级，可见，风环境标准是适用的。

This research is described by proposal new criteria for the wind environment. A technique of the research does actual measurement investigation and questionnaire survey and a wind tunnl experiment for wind environment assessment in Niigata City.It is difficult to using usual criteria for the Pacific side on the Sea of Japan side, because is compared with the Pacific side, the frequency that a strong wind blows on the Sea of Japan side by the influence of the seasonal wind of winter. Wind speed is-speeding up the current in the street which in between two residences and in exfoliation current in the roof. This is obvious fact for the field measurement, wind tunnel experiment and the numerical analysis.By the questionnaire survey for inhabitant, when they are difficult to put up an umbrella, they feel the strong wind. And when they have difficulty in walking, it gives the wind an unpleasant feeling. The permissible range of the new criteria for the wind environment is lager than in Tokyo.Allowable days against the day maximum moment wind 10m/s, 15m/s, the strong wind beyond 20m/s are 102day 21day 4days respectively in a residential zone.It was adapted to the applicable residential zones, when it set up windbreak before a wind environment is a rank 3 arca, and when it is set up the windbreak after, the environment was evaluated declined to rank 2 or rank 1. Thus it is clearly that the criteria of wind environment is suitable.