複雑地形上の拡散場の数値シミュレーション(大気(3),一般講演)

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  • Numerical Simulation of Scalar transport over complex terrain

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An atmospheric large-eddy simulation code has been applied to simulate scalar transport and dispersion from point source releases during a field campaign conducted near Mt. Tsukuba, Japan. The simulations use horizontal grid resolution as fine as 190m with six grid nesting levels to incorporate time-dependent meteorological forcing. The results show that predicted ground concentration values contain significant errors compared to measured values because the mesoscale wind typically contains a wind direction bias of a few dozen degrees. Comparisons of simulation results with observations of arc maximum concentrations, however, lie within acceptable error bounds.

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