ENHANCEMENT OF RAINFALL BY TOPOGRAPHIC EFFECTS

概要

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The radar observation was carried out in the Iburi District, Hokkaido to study the enhancement of rainfall by topographic effects and the actual interactions between low topographic clouds and rain clouds associated with disturbance. The amounts of rainfall and radar analyses showed that rainfall was enhanced only on the upwind slope even though rain bands passed over both the upwind and downwind slopes. Updraft or low topographic clouds are formed on the upwind slope when moist air masses from the sea are pushed up the slope by south-easterly wind from the sea. If, under such conditions, rain clouds associated with disturbances arrive over the upwind slope, they are modified or interact with low topographic clouds of different rain drop-size distribution, producing rain. By contrast, this mechanism is not active on the downwind slope or in other areas; therefore, it is the formation of updraft or low topographic clouds that enhances the amount of rainfall on upwind slopes only.
日本自然災害学会の論文