屈曲,分岐などの複雑な幾何形状をもつ流雪溝の水理学的検討

概要

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An experiment on snow removal channel with complex geometry was carried out. The snow transport rate is strongly affected by the complex geometry of open channel, i. e. the refraction, the branch and the joint of channels. Thus the snow transport rate in such a channel gives the critical conditions for the total system of the snow removal channel network. The velocity distributions and the water level in the longitudinal direction were measured. In the refraction part and in the branch and the joint of channels, the velocity distributions are remarkably influenced by the shape of a channel. Then we proposed a new method to calculate the water level in a channel using the equation of kinetic energy of mean flow. The model can analyze the water level of a channel with the refraction. By comparing the numerical results with experimental results of water level, the values of Manning' s friction coefficient n from 0.012 to 0.013. were obtained. Next, the experiments on snow dumping cases were carried out. The water level changes remarkably by the influence of snow lumps. Sometimes the snow lumps are blocked at the refraction and the branch of channels. Thus, the geometry of a channel strongly affects the transport of snow lumps.
長岡技術科学大学の論文
2000-03-29