ผลของสิ่งปกคลุมดินที่มีต่อสมดุลความร้อนของเมืองและการคงตัวของบรรยากาศในพื้นที่กรุงเทพมหานคร / จเร เศรยศสกุล = Effects of land cover on urban heat balance and atmospheric stability in Bangkok / Jarae Saerayossakul
The study of effects of land cover on urban heat balance was conducted by using Bowen ratio technique. The temperature and meteorological data were measured by thermometer and ultrasonic anemometer, respectively that were set on I day each type of land cover 3 seasons between 7.00 a.m.-7.00 p.m. It was found that in all seasons, green area and green area that surrounding by built land-use was highest latent heat of evaporation. And high building area and urban area was highest sensible heat. This study presents the effect of sensible heat in the urban area that was influenced on ambient temperature which knows as urban heat island effect. The results gave a good agreement to the study at Bang-Na and Bangkok meteorological stations which were collected 5 days per season 3 seasons by using Eddy correlation technique. It was found that both stations were highest sensible heat in daytime and heat balance was almost stable in nighttime in all seasons. This study was found that Eddy correlation technique was suitable study for open area while, Bowen ratio technique was suitable study for urban area. Furthermore, urban heat balance affected on atmospheric stability calculated by Monin-Obukhov length which was used Eddy correlation technique. They were unstable and very unstable conditions in daytime but were stable and very stable conditions in nighttime that were in agreement with Adiabatic cooling process. Finally, this research studied relation and tested sensible heat with multiple linear regression equation of net radiation and Bowen ratio what are important parameters for calculate sensible heat and Monin-Obukhov length. It was found that the calculation method of net radiation and Bowen ratio by multiple linear regression equation that was suitably calculated sensible heat and Monin-Obukhov length.
