Tomonori ISHIJIMA
Study of Effects on Changing Surface Boundary Condition for High Resolution using Numerical Simulation
Toshiro KUMAKURA
In gauge observation of snow precipitation, there is a problem that results in observing less amount of the precipitation by surrounding turbulence caused by wind. Therefore, catch ratio correction is required.A attempting to obtain reliable estimation of wind velocity, we use a steady-state dynamic calculation method, which is iteratively performed on to reach a steady state in certain initial and boundary conditions of a certain time. To improve the accuracy of the estimation of the wind velocity on the plains have been already known from the past.In this study, we employ new boundary conditions for an outer model and need to alter surface roughness parameter in a inner model, which uses the steady-state dynamic calculation.
Calculating areas are chosen at three meteorological stations, Nagaoka, Koide and Maki. We are conducted to define the surface roughness parameter of two kinds.When it has the same surface roughness parameter as the outer model, the calculated results is not good. The result shows that the mean error is 0.1m/s of average wind velocity 3.4 m/s in Nagaoka and 0.0m/s of average wind velocity 7.5m/s in Maki. It suggests that cannot be calculated to take over the land surface parameters from the outer model for the value of the mean error are getting better.
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