VERIFICATION OF WIND CHANNEL EFFECT AROUND AN URBAN RIVER BY THE MAP OF SEA BREEZE FRONT LINE

A river has the effect of climate alleviation not only as a cool spot but also as a so called wind channel. Statistical analysis shows the penetration of sea breeze front over Kanto plane classified into two cases, East or South-wind, influenced of synoptic scale. In these two cases the characteristics of penetration of sea breeze front were investigate on three scales (1) wide area (Kanto plane), (2) urban (Tokyo), (3) river (Ara river). Especially, as a result of meteorological field observation conducted along Ara river in detail in this summer, a typical urban river lead the sea breeze front to inland as a wind channel when South-wind matched with river flow. Around secondary scale, Tokyo, the penetration of sea breeze front are blocked over urban area because of heat island, then the front may be surrounding there.