Location
1. x-direction wind
At around KST 15:00 on August 11, air flows can be seen from the outside of the city to the direction of the city's central area. Since then, a strong convergence has occurred in the center of the city, and it can be seen that the air flow has changed in the direction of the outskirts of the city around 21:00 on the 11th. Since then, the air has been converging again from 03:00 on the 12th, and at 15:00 on the 12th, it can be seen that strong convergence takes place in the center of the city again.
2. z-direction wind
At around KST 15:00 on August 11, strong air rises outside of the city. After that, the rise of air gradually narrows down to the urban center. At around KST 21:00 p.m., the air descent occurs in the center of the city. There was little vertical movement of air for the next few hours. However, strong air rises occur again in the city center after the sun rises.
3. Temperature
At around KST 15:00 on August 11, the temperature in the central part of the city is noticeably high compared to the suburb. At 21:00, the outskirts of the city(water) will have a higher temperature than the central part of the city. At 03:00 on the August 12, the temperature outside the city becomes lower than the central part of the city again. At 09:00, the temperature in the central part of the city is much higher than outside.
Compared to the default urban, urban with water bodies showed relatively small temperature differences at both bottom and z=2m level. There was a difference of about 2.5℃ in urban with water bodies, while there was a difference of about 12℃ in cities with mixed forests. Judging from this, we can see that the impact of the sea breeze must have been very significant on the urban heat island phenomenon.
