study of mitigation of heat environment by a large restoration of inner-city river -A case of Cheong-Gye Stream in Seoul-

作者于2003-2006年8月中旬在恢复区和河流100米范围内的5个观测点观测了生理热指标SET*参数（气温、相对湿度、风速、天空辐射、地表温度）。他们用热成像仪观察了表面温度，用闪烁仪观察了向上的感热通量。他们进一步利用了首尔市观测到的空气污染物的时间序列分析。利用CFD模型对清溪川沿线冷气团的运动进行了数值模拟，并考虑了道路十字路口形成的漩涡。根据2006年超声波风速仪的观测结果表明，清溪川沿线的海风可以使冷气团向恢复区域扩散约80m。在2007年的总监测中，目的是为了证明冷空气从河流输送到城市化地区的过程的气象机制。研究人员在河中央、南岸和北岸设置了杆子，测量空气温度和相对湿度。至于水的冷却作用，离河面越近，空气温度越低，水蒸汽压越高。南岸气温相对较北岸低。另一方面，在北江边，白天近地表的气温往往较高。认为北河面为混凝土路面，南河面为植被路面。因此，这些结果表明在南岸产生了一层冷空气。

The authors observed the parameters of the physiological thermal indicator SET* (air temperature, relative humidity, wind speed, sky radiation, surface temperature) at five observation points within 100m from the restored zone and the stream in mid August in 2003-2006.They observed the surface temperature with a thermography camera, and upward sensible heat flux using a scintillometer. They further utilized the time series analysis of air pollutants observed by Seoul Metropolitan Government. Movement of cool air mass along the restored river was numerically simulated by applying a CFD model, taking into account swirls developing at road crossingsBased on observation with ultra-sonic anemometers in 2006, it was clarified that with the sea breeze along the Cheong-Gye Stream, cool air mass is able to spread approximately 80m from the restored zone.In the total monitoring in 2007, the objective was to prove the meteorological mechanism of the processes that convey the cool air from the river to urbanized area. The authors set up poles at the middle of the river and at the southern and northern riversides, where they measured air temperature and relative humidity.As for the cooling effects by water, air temperature gets lower and water vapor pressure gets higher at closer distances to the surface of the river. At the southern riversides, air temperature was relatively lower than at the northern riverside.On the other hand, at the northern riverside, air temperature near the surface is often higher during daytime. As the cause, it was considered that the surface of northern riverside was concrete pavement though southern riverside was vegetational pavement. These results therefore indicate that a layer of cool air was generated in the southern riverside.