年最大積雪強度の統計的性質とその地域特性

抄録

For the purpose to enhance the reliability of design snow loads, the snow depth increase intensity in a short term (3 or 7 days) was studied on the basis of the statistical analyses of daily snow depth data on 423 observation points in Japan. The statistical properties and the regional characteristics of the annual maximum increasing intensity of snow depth for 3 or 7 days (AMI-3 or AMI-7) have been investigated by making a comparison with those of the annual maximum snow depth (AMD). By means of the classification of types of the statistical property on a Type I extreme value probability paper, it was interpreted logically that regional differences of statistical characteristics of AMI-3, AMI-7 and AMD are caused by regional differences of snowfall mechanisms. Furthermore, a reduction coefficient for the design snow loads of buildings is proposed. This coefficient may be used only for the design of buildings which premise such treatments to reduce the snow loads on the roofs as highly reliable snow melting apparatuses.