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Two kinds of field observation of urban thermal environment were carried out to examine the cooling effects of a river and sea breeze. One is the measurement along a river and an avenue which go in th...e direction of the sea-land breeze. They are nearly parallel in the downtown with a distance of about 400 m and cross each other at 6 km upstream from the coast. Measurement points are set on the coast and the cross point. Moreover, there are four measurement points each on the river and on the avenue scattered between the coast and the cross point. This is called Obs. 1. The other is the measurement along a street nearly perpendicular to the river． There are also ten points in this observation in the area of about 800 m from the river. This is cal1ed Obs. 2． The results of Obs. 1 show that the air temperature above the river is clearly lower than that above the avenue when the sea breeze blows. The air temperature difference between them falls smaller in the downstream of the sea breeze. It is possible that the sea breeze mitigates the heat in the urban area, if it is well designed to utilize the sea breeze. The measurement points of Obs. 2 are grouped into 3 types, one is above the river, another is at the cross point with the other paths and another is in the cavity of buildings. The air temperature above the river is the lowest and next at the cross point where the wind direction is close to that of the sea breeze. It is the ventilation effect by the sea breeze.続きを見る
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