Journal of the Japan Society of Erosion Control Engineering,
Vol.57,No.6,2005
A study on setting of standard rainfall for traffic regulation during heavy rainfall
Atsuhiro YAMADA, Hiroaki TAKEMOTO, Hiroki KOBAYASHI, Kazumasa KURAMOTO, Masao ARAKAWA, Hirotaka NAKAYAMA, Kohei FURUKAWA
Abstract
The standard rainfall of traffic regulation applied in practice in Yamaguchi Prefecture was set 30 years ago, therefore, its application to the extraordinarily heavy concentration rainfall occurred in recent years needs to be proved. The current standard is not very reliable in predicting the occurrence of disasters and the setting theory is not clarified. Moreover, the time to prepare the traffic regulation is not considered in the current standard, and there is not a clear standard to remove the traffic regulation. For these reasons, it is difficult to implement traffic regulation before the occurrence of a disaster. In this study, a new standard rainfall and the application methods are investigated by using 1989 to 2003 rainfall data. The radial basis function network (RBFN) is used to determine standard rainfall more accurately and more objectively, and the effective rainfall, which is often used as a standard rainfall for erosion and sediment control projects, was adopted as a rainfall index. The new standard rainfall turned out to be a more reliable than the current standard rainfall for the standard of an impending disaster, reducing the frequency of unnecessary preparations because of unreliable predictions. In this paper, the setting methods of the standard rainfall to start and to remove traffic regulation on the basis of rainfall predictions are proposed. This method of administration makes it possible to start traffic regulation well in advance of a potential disaster and to remove traffic regulation objectively.
Key words:radial basis function network, cluster analysis, sediment disaster, heavy concentration rainfall, road
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