Yusuke YAMANAKA
One-Dimensional Numerical Simulation of Unsteady Flow on Open Channel Assuming Real River
Tokuzo HOSOYAMADA
It is important to understand river flow for the purpose of flood and water disaster. Through transportation of sand in river, deposition of sand drift deforms river shape exercises the influence on safety against water disaster. In the river-mouth region, run-up of coastal waves to river affects river flow and transportation of sand.
ˇˇNumerical simulation in 2 or 3 dimension has been executed to understand such complicated phenomena. Numerical simulation in 1 dimension has some track records in simulation of hydraulic quantity. However, it is difficult to re-create real cross section and to execute sophisticated scheme together. Numerical simulation in 1 of the river cannot consider meander of river. But it can execute very fast. Therefore it should be developed high quality. In this study, the numerical simulation model in 1 dimension using FDS which can consider real cross section, subcritical and supercritical flow was constructed. Simulation of Real river flow was executed using it. And distance of run-up of coastal waves was simulated to examine interaction between wave and river flow.
Simulation of river flow was executed using cross section of Kariyata River in Niigata, and simulation of interaction between waves and river flow was executed using cross section of Agano River in Niigata. As a result, some results which have theoretical consistency were gotten. And distance of run-up of coastal waves was approximately 50m when quantity of river flow is 450m3/s, coastal waves period is 10s, coastal waves amplitude is 0.3m. Difference results were gotten each case when quantity of river flow, coastal waves period and amplitude were changed. Distance of run-up of coastal waves is influenced by the relation between coastal waves period and river flow natural period predominantly. Because distance of run-up of coastal waves was most fluctuated when coastal waves period was changed.
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