浸透型側溝からの道路下粒状路盤層への雨水流入特性(河川・湖沼・沿岸環境(1),一般講演)

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This paper deals with the lateral infiltration process of rainwater flowing in road ditch with a permeable side wall into granular sub-base. In this study, this drainage system is simplified as the flow in a channel system having backward facing step filled with glass beads as porous media. The basic hydraulic experiments of this channel system are carried out to clarify the unsteady flow behavior. The numerical simulation using VOF method is also carried out to reproduce the flow behavior measured in experiments. The fundamental characteristics of intrusion processes of flow such as the front speed, velocity and flow depth at the origin obtained through the examination of experiments and simulations are investigated theoretically. The power law on temporal change of typical variables are derived using depth averaged open channel flow equations in porous media.
2008-09-04