市街地における洪水氾濫水の挙動に関する研究

Abstract

Experiments concerning to the unsteady two dimensional over land flood flows were performedunder various hydraulic conditions, and the characteristics of behavior of the flood flows in themodeled urban area which was made by arranging the many concrete blocks were discussed.Numerical simulation was carried out, and calculated results about time changings of theflooded area were compared with observed ones. Consequently, front velocity especially on theso called 'street' was slower than the measured one. What might be this cause was investigated andit was considered that one of the most significant factors was that the boundary conditions at theflood wave front on the dry bed had been prescribed by the threshold water depth.