愛媛県西条市のホウレンソウ栽培地域に吹く局地風アラセの特性解明

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書誌事項

タイトル別名
  • Characteristics of local wind arase blowing in the spinach cultivation area in Saijo city, Ehime prefecture.
  • エヒメケン サイジョウシ ノ ホウレンソウ サイバイ チイキ ニ フク キョク

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抄録

In order to make clear the meteorological characteristics of local wind “Arase” in Saijo City, Ehime Prefecture, the observations were carried out in the large spinach cultivation area of 2×4km2 during the winter from 1986 to 1987.<br>(1) In the clear-fine night, the thermal belt and the cold air lake were observed on a slope at the middle zone of the mountain and the low flat ground, respectively. The wind with the direction of S to SW blowing down from the Ishizuchi mountain range to the foot of Takatoge mountain was recognized as the katabatic wind or cold air current, however, the wind blew little at the low flat ground. According to the observations, the local wind “Arase” was concluded as a katabatic wind.<br>The relative humidity was low at the mountain foot and high at the low flat ground. Neither dew nor frost was not observed at the foot, but both were observed at the flat ground. The frost occurred at the northern range of the low flat ground and the dew between the foot and the northern range. On Jan. 29, 1987, 10-min-mean maximum wind speed was 4.8m/s (6.5m/s at 4m height), wind direction SSW, air temperature 5.7°C and relative humidity 41% at the height of 1m at the observation base, on the contrary at the east side point of mobile observation, 0.1m/s, calm, -1.2°C and 77%, respectively. Surface temperature at the 150m height slope and at the low flat ground was 5.8°C and -1.9°C, respectively. The typical katabatic wind seemed to be developed under the conditions of potential temperature difference 5K, elevation difference 1400m and slope length 12km.<br>The katabatic wind at night on a fine day was a warm and dry wind for a spinach crop transferring the sensible heat from the wind, the condensations of dew and frost on a crop being small. Therefore, the mountain foot region of Takatoge was suitable for a spinach cultivation. On the other hand, the frequency of the warm wind blown decreased gradually from the mountain foot to the northern low flat ground, and the air temperature was low due to radiation cooling, particularly significant at the area surrounded with banks. The humidity was high at the area of high groundwater level causing the crop desease and pest. Consequently, this low flat region was not suitable for spinach cultivation resulting in the relatively worse quality and lower quantity.<br>(2) During the clear-fine daytime, the air temperature was generally high at the mountain foot and low at the low flat ground and vice versa for the humidity. The wind was strong at the northern region by sea breeze and monsoon, and weak at the mountain foot, reversely at the nighttime. The northerly wind blew in the case of the circulation of land and sea breeze, but the westerly wind in the case effected by monsoon.<br>(3) At the flat ground, the spatial differences of meteorological phenomena were not only small on a rainy day but also rather small at the daytime on cloudy and fine days. Therefore, the meteorological condition at the nighttime on a fine day had a most important effect on the spinach growth.

収録刊行物

  • 農業気象

    農業気象 43 (4), 311-320, 1988

    日本農業気象学会

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