Analysis of the Meteorological Data in Ashiu (1) : Compare the Observation Data of Jimusho at about 360 m and Chojidani at 640 m above sea level

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  • 芦生演習林の気象観測資料の解析 (1) : 事務所構内と長治谷の観測所の比較解析を中心に
  • アシウ エンシュウリン ノ キショウ カンソク シリョウ ノ カイセキ 1

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Abstract

1) Meteorological data of air temperature, humidity, precipitation and snow cover, which have observed in Kyoto University Forest of Ashiu located at northern east part of Kyoto Prefecture for 70 years were analyzed. 2) The average annual temperature at 9 o'clock was 11.0℃ with the average extreme maximum temperature 34℃ in summer and the average extreme minimum temperature - 10℃ in winter; the average annual humidity at 9 o'clock was 83%; the average precipitation was 2370 mm with 173 days above 1 mm/day a year; the average annual maximum depth of snow cover was 108 cm with 88 days of snow cover above 1 cm in winter in Ashiu observation station at 363 m above sea level. 3) Observed values of Ashiu were 4℃ lower in the average annual temperature, 1℃ lower in the extreme maximum temperature in summer and 5℃ lower in the extreme minimum temperature in winter; above 10% higher in the average annual humidity; 800 mm more in the average precipitation a year than that of Kyoto University Experimental Forest Station on the Campus, which was located in Kyoto City and about 30 km distance from Ashiu in a straight line towards the south. And it has scarcely snown in a period of observation there. 4) Observed values of Chojidani observation station at 640 m above sea level, which was about 5 km distance from Ashiu towards the north were 2℃ lower in the average annual temperature at 10 o'clock, 5℃ lower in the average extreme maximum temperature in summer and 4℃ lower in the average extreme minimum temperature; 50 mm/month more in winter and 400 mm more a year in the average precipitation; 40 days of snow cover with the annual maximum snow depth above 200 cm more than that of Ashiu observation station. 5) Observed values of Ashiu were lower in the average annual temperature and more in the average precipitation and in the snow cover than that of any observation by Kyoto meteorological observatory in Kyoto Prefecture. The average annual temperature was 2℃ lower, the precipitation was 400 mm more a year and snow cover was 80 cm more than that of Miyama observation station, which was about 15 km distance from Ashiu towards the west at 200 m above sea level. 6) Many peculiar data were observed, for example heavy or long rain and snow in Ashiu. Ashiu has often suffered from many disasters especialy caused by heavy rain in summer in a period of observation. 7) The breaking downs of road were happened easily by over 100 mm/day or over 200 mm of total amount of precipitation. If the daily amount of precipitation was over 200 mm, heavy disasters, for example, washing away of Yuragawa Bridge and many damages of roads, hauses and facilities occurred by the flood. And damages of hauses and roads were happened easily by over 150 cm of snow cover and 20 days of snow cover above 100 cm. Over 185 cm of snow cover and 50 days of snow cover above 100 cm caused heavy damage.

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