紅外線熱像儀於泥岩坡面溫度變化之研究

Application of Thermo-tracer on Studying Surface Temperature Changes on Mudstone Slopes

10.30061/CEB.200506.0007

徐森雄(Sen-Hsiung Hsu)；黃光賢(Kuang-Hsien Huang)；廖士吟(Shin-Yin Liao)

泥岩 ； 太陽輻射 ； 地表溫度 ； 坡向 ； Mudstone ； Solar radiation ； Surface temperature ； Slope aspect

作物、環境與生物資訊

2卷2期（2005 / 06 / 01）

148 - 156

繁體中文

本研究旨在探討泥岩特殊地形之表面溫度變化，經選擇一環狀皆為青灰泥岩的天然地形，依北、東北、東、東南、南、西南、西及西北等八個方位，利用紅外線熱像儀、日射計等儀器觀測其大面積之坡面溫度分佈情形，觀測時間則選定春分、夏至、秋分及冬至等四個節氣，並配合太陽入射角與坡度之分析，所得結果摘列如下：(1)由於四節氣於正午時其太陽入射角度與日照時數之不同，造成南北坡向溫差變異大；其溫差值以冬至最大為19.6~24.2℃，其次為春、秋分，差異介於12.0~13.1℃，夏至則溫差小，甚為相近。(2)泥岩坡向溫度受到泥岩本身坡度與太陽入射角影響，若太陽入射角度為負值（如冬至，北向坡），則太陽無法直射至坡面，以致坡面無法直接受熱，溫度上升極微，若太陽入射角大於坡向之坡度則變化劇烈。(3)東、西、南等受陽坡向早晚溫差變化約20~30℃之間，唯北向坡於9月至翌年3月高低溫差約10~15℃左右。

The purpose of this study was to investigate variation of the surface temperature on mudstone slopes. A natural ring-like mudstone area was selected to measure the surface temperature changes, using an infrared thermal imaging system (thermo-tracer) and a pyranometer. The distributions of the surface temperature on different directions, including north, northeast, east, southeast, south, southwest, west, and northwest, of a deep slope area were observed. The observation time was chosen based on the four solar terms, including the vernal equinox, the summer solstice, the autumnal equinox, and the winter solstice, in accordance with the solar incident angles and mudstone slopes. The results obtained were summarized as follows. There was a major temperature variation between the northward and southward slope due to the different solar incident angles and sunshine duration. Changes of temperature in winter solstice were the biggest, between 19.6℃ and 24.2℃. In both vernal and autumnal equinox, values of temperature variation were between 12.0℃ and 13.1℃. In summer solstice, the temperature variation was extremely small. The slope of mudstone and the incident angle of solar radiation influenced the changes of temperature. When the incident angle of solar radiation entered with a negative value, as in the winter solstice on the northward slope, there was no direct radiation fall upon the slope surface. Thus, the surface temperature increased very little. When the incident angle of solar radiation was bigger than the slope, temperature changed dramatically. Temperature variation on the solar side was from 20℃ to 30℃ in the eastward, westward and southward directions. Temperature variation on the northward slope ranged from 10℃ to 15℃ from September to next March.