Temperature Distribution in the Semi-urban Area under Prevailing Sea Breeze

Abstract

The characteristics of wind behavior and thermal distribution in the Kishiwada area along Osaka Bay were surveyed through the observation of temperature and wind over the area. In this area, rural and urban landuse is intricately mixed. In this study, the seasonal and regional heterogeneity of water was considered. Firstly, it was confirmed that sea breeze from the north in the daytime and land breeze from the south-east in the nighttime were superior in this area on fine weather days when the gradient of atmospheric pressure is gentle. Then, the whole study area was divided into three (“urban”, “rural”, and “mixed”) areas according to the landuse dominance and the mean temperature in each area was compared by period (irrigation and non-irrigation). The result showed that the difference of the mean temperature among these areas in the irrigation period was wider than in the non-irrigation period and the mean temperature in the rural area, where there are a lot of farmland and irrigation ponds, was the lowest in both the daytime and the nightime. It was also indicated that in the daytime on the days with the prevailing sea breeze, the mean temperature in the mixed area was rather higher than in the coastal urban area, though the mixed area is on the inland side of the coastal urban area.