This paper describes the numerical study of nonstratified airflow over a real\ncomplex terrain. Attention is focused on the mechanism of a local strong\nwind induced by a topographic effect. In order to clarify the mechanism of\nthe occurrence of strong winds accompanied by the effects of terrain, the use\nof a numerical simulation is very effective, in which conditions can be set\nwithout the influence of ground roughness and temperature distribution. As a\nresult, airflow converged to a small basin of mountain terrain in the upper\nstream, and local strong wind was generated leeward along the slope of the\nmountain terrain. Furthermore, the influence of the reproduction accuracy of\ngeographical features, that is, horizontal grid resolution, was examined. Consequently,\nto reproduce the above-mentioned local strong wind, it was shown\nthat horizontal grid resolution from 50 m to about 100 m was necessary.
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