都市化が海風の冷却効果に及ぼす影響に関する研究

摘要

The decrease of the cooling effect potential of the sea breeze is analyzed by using the calculation results of the meso-scale meteorological model WRF. The impacts of urbanization and the distance from the coast have been studied. Because the upper wind velocity and the convective heat transfer coefficient are increased due to the penetration of the sea breeze, sensible heat flux from temperature reduction near the ground surface by the sea breeze. The impact of urbanization to the heat exchange over the ground and upper air which is represented by the convective heat transfer coefficient has been studied from the calculation results in different urbanization status by changing the parameters of the urban canopy model. The cooling effects of the sea breeze are strongly affected by the distance from the coast more than the impacts of urbanization.%メソスケールの気象モデルWRFによる計算結果を用いて，海風による冷却効果のポテンシャルの低下量に対する都市化と海岸距離の影響について考察を行った. 海風の進入に伴い上空風速，総括対流熱伝達率が増加し，上空へ輸送される顕熱流が増大するため，地上付近の気温が低く保たれることが，海風の進入による地上付近の気温緩和効果のメカニズムとして考察された.ただし，海風の進入時は非定常性が強く，モニン•ォブコフの相似則適用の課題も確認された.