| Summary: | 碩士 === 國立臺灣大學 === 土木工程研究所 === 82 === In Taiwan, very often there are heavy afternoon thunder storm
in summer. It causes the roads flooding in the cities and jams
the traffic. Traditionally, the design of surface runoff
drainage if based on rational formula. The rational formula is
easy to use, but it can not get the flow field and water depth
distriution. This thesis develops a 2-D numerical model to
predict the flow field and water depth distribution for
different rainfall in- tensity, road width, gutter interval,
inclinition of road. In the thesis, we use Mac Comack finite
differenc scheme which has good stability and convergence
properties. It also has second order accuracy in time and space
in linear system. The governing equation is 2-D hydrodynamic
wave equation which is derived from Navier Stoke equation after
depth average procedure. We also put wind shear and moving car
pressure on free surface to determine whether their effects are
important. By experimental verifi- cation, the numerical model
gives a reasonal prediction of the flow field and water depth
distribution once the parameters are given. The wind shear will
have a great effects on flow field. The car pressure do''nt have
significant effects on flow field unless the car moves very
closeto the gutter.
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