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Characteristics of the natural wind have to be grasped to utilize it as natural energy. The sea-land breeze is thought to be a suitable energy source, because its speed and direction are relatively s...table. 12 major cities distributed in the whole country are selected, and the AMeDAS data of 5 years, from 1980 to 1984, in these cities are used for analyses. The summer season is selected by the 7 days moving average of daily mean air temperature in each year. The axis of the sea-land breeze is decided from a wind rose which is drawn using all the data in this season, considering the direction of the nearest seashore in each city. The sea-land breeze component of a wind vector is defined as a component of which direction is equal to that of the axis of the sea-land breeze. Sea and land breeze hours are decided from the diurnal fluctuation of the sea-land breeze component averaged at each time. The sea-land breeze is a thermal convection of which heat source is solar radiation. The relation between the sea-land breeze component and the diurnal duration of sunshine is examined.続きを見る
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