ȹჼ෣६ඏ࣢‫ۋ‬ೂ޹ၼ౤૾ლѝмуѽ૾ლܻඈവѠ෪໧ࠏഎȹ౤ȹ ‫ޠ‬ȹ ȹ ༻̞ঽȹ ๽ȹ ൉ȹ ့ȹȹȹɲɾɺʋɆʋʈʎʇɽȹɨɻʌɾʋʏɺʍʂʈʇʌȹʈɿȹʍʁɾȹɭʁɾʋʆɺʅȹɛɾʅʍȹʈʇȹʍʁɾȹɧʈʋʍʁʐɾʌʍɾʋʇȹɬʅʈʉɾȹʈɿȹɦʍɇȹɮʓʈʎɆɽɺʄɾȹʂʇȹɧʈʍʌʎʁɺʋʎȹɚʋɾɺȹȹɧɢɬɡɢɠɚɤɢɅȹɡɺʃʂʆɾȹɺʇɽȹɤɮɝɨɡɅȹɝɺʂʌʎʄɾȹȹȹȹȹȹȹȹȹȹȹȹȹȹȹȹȹȹȹ൉࿾൉޸ࢯ‫گ‬࿳ળ‫޸݌‬࿨ड़ࢂࡆᅃȹ ൊ 33 ߪൊ 2 ৺2011 ໧ 10 ॆȹ သੰ
Reprinted From
THE RESEARCH BULLETIN OF THE FACULTY OFEDUCATION AND WELFARE SCIENCE,OITA UNIVERSITY
Vol. 33, No. 2̜October 2011
OITA, JAPAN኱ศ኱Ꮫᩍ⫱⚟♴⛉Ꮫ㒊◊✲⣖せ㸦Res. Bull. Fac. Educ.䠃Welf. Sci., Oita Univ.䠅㔝ὠཎᆅ༊Ᏹ᭮ᓅ໭すᩳ㠃࡟࠾ࡅࡿᩳ㠃131

ᬮᖏࡢ㏻ᖺほす ᇉ  ⫕㸨࣭ᕤ ⸨ ኱ ㍜㸨㸨࠙せ ᪨ࠚ  ኱ศᕷ㔝ὠཎᆅ༊ࡢ┅ᆅ࠿ࡽᏱ᭮ᓅࡢ໭すᩳ㠃࡟࠿ࡅ࡚ࡢᆅᇦ࡟࠾࠸࡚㸪Ẽࡢศᕸ࡜ኚືࡢほࡶᩳ㠃୰⭡ࡢ࡯࠺ࡀ㧗ᩳ㠃ࢆ 2 ᖺᙅࡢ㛫⾜ࡗࡓࠋኪ㛫࡟┅ᗏࡼࡾ࡜࡞ࡿ⌧㇟㸪ᩳ㠃ᬮᖏ࡟ὀ┠ࡋࡓࠋᙜᆅ࡟࠾ࡅࡿᬮᖏࡢฟ⌧㢖ᗘ㸪᭱ᬮᇦ㧗ᗘ㸪ᙉᗘ࡟ࡘ࠸࡚㸪ࡑࡢヲ⣽㸦Ꮨ⠇ኚ໬ࢆྵࡴ㸧ࢆึࡵ࡚᫂ࡽ࠿࡟ࡋࡓࠋᩳ㠃ᬮᖏࡣほᮇ㛫ࡢ࠺ࡕ༙ᩘᙅࡢ᪥࡟ࡳࡽࢀࡿࠋฟ⌧㢖ᗘࡣኟ࡟ᑡ࡞ࡃ㸪⛅࠿ࡽ᫓࡟ከ࠸ࠋ᭱ᬮᇦࡣ┅ᗏࡼࡾࡶ⣙ 250m 㧗࠸࡜ࡇࢁ࡟ࡳࡽࢀࡿࡇ࡜ࡀከ࠸ࠋᩳ㠃ᬮᖏࡢᙉᗘࡣኟ࡟ᙅࡃ㸪⛅࠿ࡽ᫓࡟ᙉ࠸ࠋᙉ࠸᫬Ꮨ࡟࠾ࡅࡿ᭱ᬮᇦ࡜┅ᗏ࡜ࡢẼ࣮࣮࠙࢟࣡ࢻࠚ  ᩳ㠃ᕪࡢ┠Ᏻࡣ 4㹼6Υ࡛࠶ࡿࠋᬮᖏ ㏫㌿ᒙ Ꮨ⠇ኚ໬ ┅ᆅ ᚤẼ㇟Ϩ ࡣࡌࡵ࡟┅ᆅࡢ࿘ᅖ࡟ࡳࡽࢀࡿ≉ᚩⓗ࡞ᒁᆅẼ㇟࡟㸪ᩳ㠃ᬮᖏࡀ࠶ࡆࡽࢀࡿ㸦ࡓ࡜࠼ࡤྜྷ㔝㸪1986㸹

ᕝす㸪1994㸹᱓ᙧ㸪1994㸧ࠋࡇࡢ⌧㇟ࡣ㸪ᬕኳ࡛㢼ࡀᙅ࠸᪥ࡢኪ㛫࡟ࡼࡃࡳࡽࢀࡿࠋࡑࡢࡋࡃ
ࡳࢆᅗ 1 ࡟ᶍᘧⓗ࡟♧ࡍࠋࡲࡎᆅ⾲㠃ࡀᨺᑕ෭༷ࢆཷࡅ㸪ࡑࡢᆅ⾲㠃࡟෭ࡸࡉࢀ࡚ᐦᗘࢆቑࡋ
ࡓ✵Ẽࡀᩳ㠃ࢆୗࡾ㸦෭Ẽὶ㸧㸪┅ᗏ࡟⵳✚ࡉࢀ࡚෭Ẽ†ࢆᙧᡂࡍࡿࠋᩳ㠃୰⭡࡛ࡣ㸪෭ࡸࡉࢀࡓ✵Ẽࡀὶฟࡋ࡚Ẽࡢୗ㝆ࡀᑠࡉࡃ㸪┅ᗏࡼࡾࡶ㧗࡜࡞ࡾ㸪ᩳ㠃ᬮᖏࡀᙧᡂࡉࢀࡿࠋ

ᮏ◊✲ࡢᑐ㇟࡜ࡍࡿᆅᇦࢆᅗ 2 ࡟♧ࡍࠋ⌧ᆅࡣูᗓ‴࠿ࡽ࠾ࡼࡑ 10 km ෆ㝣࡟఩⨨ࡍࡿࠋ኱ศᕝࡢᨭὶ࡛࠶ࡿ୐℩ᕝࡀ༡す࠿ࡽ໭ᮾ࡟ὶࢀࡿࠋ୐℩ᕝἢ࠸࡟኱ศᕷ㔝ὠཎᆅ༊ࡢ┅ᆅ㸦ᅗ
2b㸧ࡀ࠶ࡾ㸪ࡑࡢ༡ᮾ࡟Ᏹ᭮ᓅ㸦࠺ࡒ࠺ࡔࡅ㸧㸪㞀Ꮚᓅ㸪㟋ᒣ㸦ࡾࡻ࠺ࡐࢇ㸧ࡀ࠶ࡿࠋ┅ᆅࡢ໭すഃࡢୣ㝠ᆅࡣᶆ㧗 200 m ⛬࡜㸪ẚ㍑ⓗప࠸ࠋᯇỌ㸦2002㸧ࡣᙜᆅ࡟࠾ࡅࡿẼᆅࡀ㧗ࡢᐃⅬほࢆ⾜࠸㸪ኪ㛫࡟࠾ࡅࡿẼ࡟࡞ࡿࡇ࡜㸧ࡢฟ⌧ࢆ☜ㄆࡋࡓࠋࡑࡢほࡢᵓ㐀ࡣ᫂ࡽ࠿࡛࡞࠸ࠋࡑࡢ௚࡟ࡣほࡵ࡚ᖺ㛫ࢆ㏻ࡋࡓほ㏆ᖺࡢᩳ㠃ศᕸグ㘓ࡢᩥ⊩ࡣ࡞࠸ࠋࡑࡇ࡛㸪ᮏ◊✲࡛ࡣᩳ㠃ୖ㒊ࢆྵࢆ⾜࠸㸪ᙜᆅ࡟࠾ࡅࡿᩳ㠃ᬮᖏࡢほ㏫㌿㸦పᆅࡼࡾࡶ㧗⠊ᅖࡣᩳ㠃ୗ㒊࡟㝈ࡽࢀ࡚࠸࡚㸪Ẽᬮᖏࡢᵓ㐀࡜Ꮨ⠇ኚ໬ࢆ᫂ࡽ࠿࡟ࡍࡿࠋⓗ◊✲࡟㸪ḟࡢࡶࡢࡀ࠶ࡆࡽࢀࡿ㸸Ueda et al. (2003) ࡜ᇼ࡯࠿㸦2006㸧ࡢ⟃Ἴᒣすᩳ㠃࡟࠾ࡅࡿࡶࡢ㸪Mori and Kobayashi (1996) ࡢすᒣ㸦⚟ᒸ┴ⱝᐑ⏫㸧࡟࠾ࡅࡿࡶࡢ㸪Kobayashi et al. (1994) ࡢኴᐓᗓᕷ࡟࠾ࡅࡿࡶࡢ㸪⏣୰࡯࠿㸦2000㸧ࡢඵࣨᓅᖹᡂ 23 ᖺ 5 ᭶ 31 ᪥ཷ⌮㸨࡟ࡋࡀࡁ࣭ࡣࡌࡵ ኱ศ኱Ꮫᩍ⫱⚟♴⛉Ꮫ㒊⌮ᩘᩍ⫱ㅮᗙ㸦ᾏὒ≀⌮Ꮫ࣭Ẽ㇟Ꮫ㸧㸨㸨ࡃ࡝࠺࣭ࡔ࠸ࡍࡅ ኱ศ኱Ꮫ኱Ꮫ㝔ᩍ⫱Ꮫ◊✲⛉ᩍ⛉ᩍ⫱ᑓᨷ⌮⛉ᩍ⫱ᑓಟ

132

す ᇉ࣭ᕤ ⸨a
冷気流

暖気

斜面温暖帯
暖x

冷気湖
x寒ᅗ㸯 ᩳ㠃

福岡県

山

大分県
大分川

盆地

熊本県

10 km

ᬮᖏ࡜෭Ẽ†ࡢᶍᘧᅗ༡㯄࡟࠾ࡅࡿࡶࡢࠋࡇࢀࡽࡢほb࡛ࡣ㸪ᗘグ㘓ィࡢ᫬⣔ิ࡟ຍ࠼࡚ಀ␃Ẽ⌫ࡢẼ

七瀬川

200㖄┤ศᕸࡸࢧ࣮ࣔࢢࣛࣇ࢕࣮ࡢ⇕㉥እ⏬ീ

100

UZ1

盆地

ࡀ⏝࠸ࡽࢀ㸪⌧㇟ࡢ❧యⓗᵓ㐀ࡀ᫂ࡽ࠿࡟

UZ2࡞ࡗ࡚࠸ࡿࠋᮏ◊✲࡟࠾࠸࡚ࡣ㸪ୖグࡢ◊✲࡟ࡣ࡞࠸㏻ᖺࡢほࢆ⾜࠸㸪Ꮨ⠇ኚ໬ࢆ200

ϩ ほ࡟㟁ᏊᘧࡢࡢẼ

Ⅼ UZ1㹼UZ7ᗘグ㘓ィࢆタ⨨ࡋ㸪5 ศࡈ࡜ࢆグ㘓ࡋࡓࠋ

400

霊山

596 m

400

UZ4
UZ5

UZ6 600
UZ7宇曽岳644 m

1 km

࡛ࡣ㸪ᅗ 2b ࡟♧ࡍ 7100
200

UZ3

ㄪ࡭ࡿࠋ

ほ

大分市

七瀬川

障子岳
750 m

ᅗ㸰 ほ ࡢᑐ㇟ᆅᇦࠋ(a) ᗈᇦᅗࠋᯟࡣ(b)ࡢ⠊ᅖࠋ(b) ᆅᙧ࡜ ⅬࠋⅬࡢ㑅ᐃࡣ㸪┅ᗏࡢ

UZ1 ࠿ࡽᏱ᭮ᓅᒣ㡬 UZ7 ࡲ࡛ࡢ㛫㸪Ᏹ᭮ᓅ໭すᩳ㠃࡟ἢࡗ࡚㸪ᶆ㧗ࡢ㛫㝸ࡀ࠾ࡼࡑ 100 m ࡟Ⅼࡢᶆ㧗ࡣ⾲ 1 ࡢ࡜࠾ࡾ࡛࠶ࡿࠋ࡞ࡿࡼ࠺࡟⾜ࡗࡓࠋྛჾࡣ㸪ࡍ࡭࡚ࡢⅬ࡛ᮌ㝜࡟タ⨨ࡋ㸪ࢭࣥࢧ㒊ࢆᆅୖ⣙ 1.5 m ࡢ㧗ࡉ࡟ࡋࡓࠋ㝧ࡼࡅࢆ௜ࡅ࡚࠸࡞࠸ࡓࡵ㸪୍㒊ࡢ᫬㛫ᖏ࡟᪥ᑕࡢᙳ㡪࡜ࡳࡽࢀࡿグ㘓ࡀ࠶ࡿࡀ㸪ᮏ◊✲࡟࠾࠸࡚ࡣኪ㛫ࡢẼࡢࡳࢆゎᯒࡢᑐ㇟࡜ࡍࡿࠋ ჾࡣ IBC ♫ࡢ࣐࢖ࢡࣟࢹ࣮ࢱ࣮ࣟ࢞MDL-88 ࠾ࡼࡧࢸ࢕࢔ࣥࢻࢹ࢖♫ࡢ࠾ࢇ࡝࡜ࡾ Wireless RTR-52 ࢆ౑⏝ࡋࡓࠋほᮇ㛫ࡣ㸪2005 ᖺ 5 ᭶ 14 ᪥࠿ࡽ 2007 ᖺ 4 ᭶ 15 ᪥ࡲ࡛ࡢ 2 ᖺᙅ࡛࠶ࡿࠋࡓࡔࡋ㸪ḟࡢᮇ㛫ࡣḞ࡜࡞ࡗ࡚࠸ࡿ㸸2006 ᖺ 2 ᭶ 20 ᪥㹼3 ᭶ 5 ᪥㸦13 ᪥㛫㸧㸪9 ᭶ 10 ᪥㹼18 ᪥㸦9 ᪥㛫㸧㸪2007 ᖺ 2 ᭶ 19 ᪥㹼24 ᪥㸦6 ᪥㛫㸧ࠋࡇࢀࡽࡢ௚㸪ჾࡢ୙ㄪ➼࡟ࡼࡿ㒊ศⓗ࡞Ḟࡀ࠶ࡾ㸪ࡑࡢ᪥ᩘࡣ UZ1 ࡟ 64 ᪥㸪UZ3 ࡟ 1 ᪥㸪UZ5 ࡟ 70 ᪥㸪UZ6 ࡟ 60 ᪥㸪UZ7 ࡟ 6 ᪥࡛࠶ࡿࠋḞࡀྵࡲࢀ࡚ࡣ࠸ࡿࡀ㸪Ꮨ⠇ኚ໬ࡢᇶᮏⓗ≉ᚩࢆ▱ࡿࡓࡵ࡟ࡣ༑ศ࡞ࢹ࣮ࢱࡀᚓࡽࢀࡓࠋ⾲㸯 ྛⅬࡢᶆ㧗UZ138 m

UZ2106 m

UZ3199 m

UZ4305 m

UZ5405 m

UZ6514 m

UZ7644 mᏱ᭮ᓅ໭すᩳ㠃࡟࠾ࡅࡿᩳ㠃133

ᬮᖏࡢ㏻ᖺほϪ ⤖ᯝ࡜⪃ᐹ1 ᩳ㠃 ᬮᖏࡢฟ⌧౛
ほ ࡉࢀࡓ᫬⣔ิࡢ࠺ࡕ㸪ᩳ㠃 ᬮᖏࡀฟ⌧ࡋࡓ඾ᆺ౛ࢆᅗ 3 ࡟♧ࡍࠋࡇࡢᮇ㛫㸪஑ᕞࡣす᪥ᮏࡢ༡࡟఩⨨ࡍࡿ㧗Ẽᅽ࡟࠾࠾ࢃࢀ㸪኱ศ࡛ࡣ࡯࡜ࢇ࡝ࡢ᫬㛫ᖏ࡛ᛌᬕࡲࡓࡣᬕࢀࡢኳẼࡔࡗࡓࠋኪ㛫࡟࠾࠸࡚㸪┅ᆅࡢ 2 Ⅼ㸦UZ1 ࡜ UZ2㸧ࡢࡳ࡟㢧ⴭ࡞෭࠼㎸ࡳࡀࡳࡽࢀ㸪୰⭡ࡢ࡯࠺ࡀ㧗 ࡜࡞ࡿẼ ㏫㌿ࡀࡳࡽࢀࡿࠋࡓ࡜࠼ࡤ 2005 ᖺ 11 ᭶ 27 ᪥㹼28 ᪥࡟࠾࠸࡚ࡣ㸪᪥ࡢධࡾ᫬้㸦17 ᫬ 07 ศ㸧࡟㏆࠸ 27 ᪥ 17 ᫬๓࡟Ẽ ㏫㌿ࡀጞࡲࡾ㸪19 ᫬ࡈࢁࡲ࡛࡟Ẽ ᕪࡀᛴቑࡍࡿࠋࡑࡢᚋࡶẼ ᕪࡣ⦆ࡸ࠿࡟ቑ኱ࡋ࡚ 6㹼7Υ࡟㐩ࡋ㸪᪥ࡢฟ᫬้㸦6 ᫬ 56 ศ㸧࡟㏆࠸ 28
᪥ 7 ᫬ࡈࢁࡲ࡛ⴭࡋ࠸Ẽ ㏫㌿ࡀ⥔ᣢࡉࢀࡿࠋ᪥୰ࡢẼ ࡟ࡳࡽࢀࡿࢫࣃ࢖ࢡ≧ࡢ㧗 ࡣ᪥ᑕ

[℃]
30

気温

20
UZ4
UZ5

100

UZ6
UZ7

UZ3
UZ2
UZ1

11/25

11/26

11/27

11/28

日付 （2005年）[m]
500Ⅼ࡟࠾ࡅࡿẼࡢ᫬㛫ኚ໬

UZ72℃

30

UZ40

UZ12528日付ᅗ㸲 2005 ᖺ 11 ᭶ 25 ᪥㹼28 ᪥࡟࠾ࡅࡿẼࡢ㧗ᗘศᕸࠋᢡࢀ⥺ࡣ UZ1 ࡢẼ ࢆᇶ‽࡜ࡍࡿ㖄┤ศᕸ࡛㸪ᕥ࠿ࡽࡑࢀࡒࢀ
25㸪26㸪27㸪28 ᪥ࡢࡶࡢࢆ㸪ཎⅬࢆࡎࡽࡋ࡚♧ࡋ࡚࠸ࡿࠋ

日数高度ᅗ㸱 ྛ

20欠測
不発生
発生

1005678 9 10 11 12 1234月

ᅗ㸳 ᭶ࡈ࡜ࡢᩳ㠃 ᬮᖏࡢⓎ⏕᪥ᩘࠋྛ᭶ࡢᕥ㸦ྑ㸧ࡢᲬࡣ 1㸦2㸧ᖺ┠ࢆ⾲ࡍࠋ

134す ᇉ࣭ᕤ ⸨ࡢᙳ㡪࡜ᛮࢃࢀࡿࠋ඾ᆺⓗ࡞ᩳ㠃ᬮᖏࡢ㖄┤ᵓ㐀ࡢ౛࡜ࡋ࡚㸪ᅗ 3 ࡜ྠ᪥ࡢࡶࡢࢆᅗ 4 ࡟♧ࡍࠋྛⅬࡢẼ

0 ᫬㹼6 ᫬ࡢᖹᆒẼࢆ౑ࡗ࡚࠸ࡿࠋ࠸ࡎࢀࡢ᪥ࡶẼ࡛ࡢ㛫㸦ᶆ㧗ᕪ 267 m㸧࡟ࡳࡽࢀ㸪ࡑࡢẼᕪࡣࡑࢀࡒࢀ 6.2Υ㸪6.6Υ㸪5.9Υ㸪7.2Υ࡛࠶ࡿࠋࡑࡢୖࡢ UZ4 ࠿ࡽ UZ7 ࡟࠿ࡅ࡚ࡣ㝆ࡀࡳࡽࢀࡿࠋࡑࡢ࠺ࡕ UZ4㹼UZ5 ࡟ࡣࢃࡎ࠿࡞㝆UZ5㹼UZ6 ࡟ࡣ஝⇱᩿⇕ῶ⋡࡟㏆࠸㝆

㸪UZ6㹼UZ7 ࡟ࡣ⦆ࡸ࠿࡞㝆‵ᗘࢆྵࡵࡓほࡣࡢ㏫㌿ࡀ┅ᗏ UZ1 ࠿ࡽ୰⭡ࡢ UZ4 ࡲࢆ⾜ࡗࡓ࡜ࡇࢁ㸪ኪ㛫ࡢ┅ᗏࡢࡳ࡟ప㸪ࡀ㸪ࡑࢀࡒࢀࡳࡽࢀࡿࠋ࡛‵₶࡞✵ẼࡀᏑᅾࡍࡿ౛ࡀ࠶ࡗࡓࠋ௜㘓࡟♧ࡍࡼ࠺㸪ࡑࡢヲ⣽ࡸ࣓࢝ࢽࢬ࣒ࡣ᫂ࡽ࠿࡛࡞ࡃ㸪௒ᚋࡢㄢ㢟࡛࠶ࡿࠋ2 ᩳ㠃 ᬮᖏࡢᏘ⠇ኚ໬⣙ 2 ᖺ㛫ࡢほ ⤖ᯝ࡟ᇶ࡙࠸࡚㸪ᩳ㠃 ᬮᖏࡢᏘ⠇ኚ໬ࢆ᳨ウࡍࡿࠋྛ Ⅼ࡟࠾ࡅࡿẖ᪥ 0
᫬㹼6 ᫬ࡢᖹᆒẼ ࡟ᇶ࡙࠸࡚ゎᯒࢆ⾜࠺ࠋᖺ㛫ࢆ㏻ࡋ࡚Ẽ ㏫㌿ࡀฟࡸࡍ࠸ࡓࡵ㸪ࡇࡢ᫬㛫ᖏࢆ㑅ᢥࡍࡿࠋࡲࡎ㸪ᩳ㠃 ᬮᖏࡢⓎ⏕㢖ᗘ࡟ὀ┠ࡍࡿࠋᩳ㠃୰⭡࠿ࡽᏱ᭮ᓅᒣ㡬࡟࠿ࡅ࡚ࡢ UZ3㹼UZ7࠿ࡽ᭱ࡶ㧗࠸Ẽ ࢆᢳฟࡋ㸪ࡑࡢẼ ࡀ┅ᗏ UZ1 ࡼࡾࡶ 2.0Υ௨ୖ㧗࠸࡜ࡁࢆ ᬮᖏࡢⓎ⏕࡜ࡍࡿࠋẼ ᕪࡢᇶ‽ 2.0Υࡣ᫂☜࡞Ẽ ㏫㌿ࢆ⾲ࡍࡶࡢ࡛㸪ᇼ࡯࠿㸦2006㸧࡟‽ࡌ࡚࠸ࡿࠋ࡯࡜ࢇ࡝ࡢⓎ⏕᪥࡟࠾࠸࡚㸪ᩳ㠃ୖ㒊࡟࠾ࡅࡿẼ ࡣ୰⭡ࡢẼ ࡼࡾࡶప࠸㸦ᅗ 4㸪ᚋ㏙ࡢ⾲ 2㸧⾲㸰ᬮᖏࡢⓎ⏕᪥ᩘ࡜㸪UZ3㹼UZ7 ࡢྛ ⅬࡀẼ ᭱㧗࡜࡞ࡗࡓᅇᩘࠋほ ᪥ᩘࡢ*ࡣ㸪Ḟࡀྵࡲࢀ࡚࠸ࡿࡇ࡜ࢆ♧ࡍࠋᣓᘼෆࡢᩘᏐࡣᙜヱ ⅬࡢࡳࡀḞ ࡜࡞ࡗࡓ᪥ᩘࢆ⾲ࡍࠋ

ᖺ
2005

2006

2007

ྜィ᭶
05
06
07
08
09
10
11
1201
02
03
04
05
06
07
08
09
10
111201
02
03
04

ほ᪥ᩘ
17*30
31
31
30
3130
31
31
19*
26*303130313121*
3130
313122*
3115*
672*

Ⓨ⏕᪥ᩘ
1275
1271522
14
18614
13
10122
61120
16
1724
1220
10305

UZ3
11212524
3
11(1)
1432
5121
7260(1)

UZ4
74
54
815
9122
13
8
75
1
5715
13
1112
10
107190

UZ542
3
6
12
5
1
32(26)
(30)
3(14)
7
1
1UZ6(14)
(31)
(15)

1211
13
148(70)

UZ72

11(6)

3(60)

4(6)

Ᏹ᭮ᓅ໭すᩳ㠃࡟࠾ࡅࡿᩳ㠃ࡀ㸪ࡇࡇ࡛ࡣࡑࡢࡇ࡜ࢆᩳ㠃135

ᬮᖏࡢ㏻ᖺほᬮᖏࡢⓎ⏕ࢆุᐃࡍࡿ㝿ࡢ᮲௳࡟ࡣࡋ࡚࠸࡞࠸ࠋ᭶ࡈ࡜ࡢⓎ⏕᪥ᩘࢆᅗ 5 ࡟♧ࡍࠋ≉ᚩ࡜ࡋ࡚㸪6 ᭶㹼9 ᭶๓༙࡟ᑡ࡞ࡃ㸪௚ࡢ᫬Ꮨ࡟ከ࠸ࡀ㸪ࡑࡢ୰࡛ 10 ᭶㹼1 ᭶࡟≉࡟ከ࠸ࡇ࡜ࡀ࠶ࡆࡽࢀࡿࠋ9 ᭶ࡣ㸪୧ᖺ࡜ࡶ๓༙࡟ᑡ࡞ࡃᚋ༙࡟ከ࠸
㸦2006 ᖺ 9 ᭶ࡢḞᮇ㛫ࡣ 10 ᪥㹼18 ᪥㸧ࠋᅇᩘࡢ┠Ᏻࡣ㸪ኟ࡟᭶㛫 3㹼10 ᅇ㸪෤࡜᫓࡟ 10㹼20 ᅇ㸪⛅࡟ 15㹼20 ᅇ࡛࠶ࡿࠋⓎ⏕㢖ᗘࢆᩘ࠼ࡿ㝿㸪UZ1 ࡀḞࡢẼ࡜ UZ1 ࡜ࡢẼ
࡚ UZ1 ࡢẼᩳ㠃ࡕẼࡢᮇ㛫㸦2006 ᖺ 12 ᭶ 25 ᪥㹼2007 ᖺ 3 ᭶ 4 ᪥㸧ࡣ UZ2ࢆ௦⏝ࡋ࡚࠸ࡿࠋࡑࡢᙳ㡪࡟㛵ࡋ࡚㸪๓ᖺྠᮇ㛫ࡢᩳ㠃ᕪࡢᖹᆒࡣ 0.6Υ㸦UZ2 ࡀ㧗ᬮᖏࡢⓎ⏕᪥࡟࠾ࡅࡿ UZ2㸧㸪ᶆ‽೫ᕪࡣs0.7Υ࡛࠶ࡿࠋࡑࡢᮇ㛫࡟࠾࠸

ࢆ UZ2 ࡢࡶࡢ࡛௦⏝ࡍࡿሙྜ㸪ᩳ㠃ᬮᖏࡢⓎ⏕ᅇᩘࡣ 1 ᅇῶࡿࡢࡳ࡛࠶ࡿࠋ

ᬮᖏࡢ᭱ᬮᇦ㧗ᗘ࡜ࡑࡢᏘ⠇ኚ໬ࢆ᳨ウࡍࡿࠋࡇࡇ࡛ࡣᩳ㠃ୖࡢࡀ᭱㧗ࡢ⟠ᡤࢆㄪ࡭ࡿࠋྛⅬࡑࢀࡒࢀ࡟࠾࠸࡚Ẽィࡋࡓ⤖ᯝࢆ㸪⾲ 2 ࡟♧ࡍࠋࡓࡔࡋ㸪ᩳ㠃ࡀ᭱㧗ࢆ♧ࡋࡓᅇᩘࢆ᭶ࡈ࡜࡟㞟ᬮᖏࡀฟ⌧ࡋ࡚࠸࡞࠸᪥ࡣ㝖እࡉࢀ࡚࠸ࡿࠋྠⅬࡀ࠶ࡿሙྜࡣᶆ㧗ࡢప࠸࡯࠺ࢆ࡜ࡗ࡚࠸ࡿࠋ㒊ศⓗ࡟Ḟࢃ࠿ࡿࠋẼ

Ⅼ UZ3㹼UZ7 ࡢ࠺ࡀྵࡲࢀ࡚ࡣ࠸ࡿࡀ㸪௨ୗࡢࡇ࡜ࡀࡀ᭱㧗ࡢ⟠ᡤࡣ㸪኱ከᩘࡢ᪥࡟ UZ3 ࠿ࡽ UZ5 ࡢ㛫㸦┅ᗏࡼࡾࡶ 161㹼367 m 㧗ᡤ㸧࡟ࡳࡽࢀ㸪୰࡛ࡶ UZ4 ࡟ࡳࡽࢀࡿࡇ࡜ࡀ᭱ࡶከ࠸ࠋUZ6 ࡸ UZ7 ࡟ࡳࡽࢀࡿᅇᩘࡣࡈࡃᑡ࡞࠸ࠋᏘ⠇ኚ໬ࡣᑠࡉ࠸ࡀ㸪ฟ⌧㧗ᗘࡀኟ࡟㧗ࡃ෤࡟ప࠸ഴྥࡀࡳࡽࢀࡿࠋᩳ㠃ᬮᖏࡢᙉᗘ࡜ࡑࡢᏘ⠇ኚ໬ࢆ᳨ウࡍࡿࠋࡇࡇ࡛ࡣᬮᇦ࡜┅ᗏ࡜ࡢẼࡍࠋ᭱㧗Ẽࡀ᭱ࡶ㢖ฟࡍࡿ UZ4 ࡜┅ᗏ UZ1 ࡜ࡢẼࡔࡋ㸪UZ1 ࡀḞࡢᮇ㛫ࡣ UZ2 ࡢẼᕪࢆᙉᗘ࡜ࡳ࡞

ᕪࡢ㸪᪥ࡈ࡜ࡢࡶࡢࢆᅗ 6 ࡟♧ࡍࠋࡓࢆ௦⏝ࡋ࡚࠸ࡿࠋ࡯࡜ࢇ࡝ࡢኪ࡟࠾ࡅࡿẼᕪࡣ ï2ᕪࡀ 4㹼7Υࡢᙉ࠸ᬮᖏࡀࡋࡤࡋࡤࡳࡽࢀࡿࠋᏘ⠇ኚ໬࡟ὀ┠ࡍࡿ࡜㸪6 ᭶ᚋ༙࠿ࡽ 9 ᭶๓༙ࡲ࡛ࡢᮇ㛫࡟ࡣᙉ࠸ᬮᖏࡀࡳࡽࢀ࡞࠸㸦4Υ௨ୖࡢ್ࡀ࡯

㹼7Υࡢ㛫࡛࠶ࡿࠋ඲యⓗ࡟ࡣẼ࡜ࢇ࡝࡞࠸㸧ࡇ࡜ࡀ┠❧ࡘࠋ⛅࠿ࡽ᫓࡟࠿ࡅ࡚ࡢ඾ᆺⓗ࡞Ẽ࡚ࡣ㸪ᩳ㠃ᕪࡣ 4㹼6Υ࡛࠶ࡿࠋᅗ 6 ࡟࠾࠸ᬮᖏࡀฟ⌧ࡋ࡞࠸᪥ࡢ≧ែࢆྵࡵ࡚࠶ࡽࢃࡍࡓࡵ㸪ᩳ㠃୰⭡ࡢẼ࡜ࡋ࡚㸪᭱ᬮ

Ⅼ࡛ࡣ࡞ࡃ UZ4 ࡢࡶࡢࢆ౑ࡗࡓࠋ᭱ᬮⅬࡢࡶࡢࢆ౑࠺ሙྜ㸪305 ᪥୰ 108 ᪥࡟࠾࠸࡚Ẽᕪࡀᣑ኱ࡍࡿࡀ㸪ࡑࡢᣑ኱ᖜࡣᖹᆒ 0.5Υ࡟ࡍࡂ࡞࠸ࠋࡋࡓࡀࡗ࡚㸪ୖグࡢ≉ᚩࡣࠕUZ4 ࡜┅ᗏ࡜ࡢẼᕪࠖ࡟ᑐࡋ࡚ࡶࠕ᭱ᬮᇦ࡜┅ᗏ࡜ࡢẼᕪࠖ࡟ᑐࡋ࡚ࡶᡂࡾ❧ࡘࠋᇶᮏⓗ࡞Ꮨ⠇ኚ໬ࡣ㸪Ⓨ⏕㢖ᗘ࠿ࡽぢࡿሙྜ࡜ྠᵝ࡟㸪⛅࠿ࡽ᫓࡟࠿ࡅ࡚άⓎ࡛㸪ኟ࡟୙άⓎ࡜࠸࠺ࡶࡢ࡛࠶ࡿࠋ⛅࠿ࡽ᫓ࡢ୰࡛ࡣ㸪Ⓨ⏕㢖ᗘ࡛ぢࡿ࡜⛅࡟㢖Ⓨ㸪Ⓨ⏕᫬ࡢᙉᗘ࡛ぢࡿ࡜⛅ࡔࡅ࡛࡞ࡃ᫓࡟ࡶᙉ࠸㸪࡜࠸࠺≉ᚩࡀࡳࡽࢀࡿࠋኟ࡟ᙅࡃ⛅࠿ࡽ᫓࡟࠿ࡅ࡚ᙉ࠸࡜࠸࠺≉ᚩࡣ㸪᥋ᆅ㏫㌿ᒙ࡟ࡘ࠸࡚ࡢ࠸ࡃࡘ࠿ࡢほ౛࡜୍⮴ࡍࡿ㸦ྜྷ㔝㸪1986㸧ࠋϫ ࡲ࡜ࡵ㔝ὠཎࡢ┅ᆅ࠿ࡽᏱ᭮ᓅ໭すᩳ㠃࡟࠿ࡅ࡚ࡳࡽࢀࡿᩳ㠃ࡀࢃ࠿ࡗࡓࠋ(1) ᩳ㠃ᬮᖏࡀฟ⌧ࡋࡓ᪥ࡣほᬮᖏࡢほㄪᰝࢆ⾜࠸㸪ḟࡢࡇ࡜ᮇ㛫ࡢ༙ศᙅ࡛࠶ࡿࠋฟ⌧ࡢ㢖ᗘࡣኟ࡟ᑡ࡞ࡃ⛅࠿ࡽ᫓࡟ከ࠸ࡀ㸪⛅࠿ࡽ᫓ࡢ୰࡛ࡣ⛅࡟ࡸࡸከ࠸ࠋ(2) ᭱ᬮᇦࡣ┅ᗏ࠿ࡽ࠾ࡼࡑ 250 m 㧗࠸࡜ࡇࢁ࡟ࡳࡽࢀࡿࡇ࡜ࡀከ࠸ࠋࡑࡢ㧗ᗘࡣኟ࡟ࢃࡎ࠿࡟㧗࠸ഴྥࡀ࠶ࡿࠋ(3) ᩳ㠃Ⓨ⏕ࡋࡓሙྜࡢᙉᗘࡣ᪥࡟ࡼࡗ࡚␗࡞ࡿࡀ㸪ᬮᇦ࡜┅ᗏ࡜ࡢẼᬮᖏࡀᕪࡣ㸪6 ᭶ᚋ༙㹼9 ᭶๓༙࡟ᑠࡉࡃ⛅࠿ࡽ᫓࡟኱ࡁ࠸ࡀ㸪⛅࠿ࡽ᫓ࡢ୰࡛ࡣ⛅࡜᫓࡟ࡸࡸ኱ࡁ࠸ࠋᙉ࠸᫬Ꮨ࡟࠾ࡅࡿ᭱ᬮᇦ࡜┅ᗏ࡜ࡢẼᕪࡢ┠Ᏻࡣ 4㹼6Υ࡛࠶ࡿࠋ136

す ᇉ࣭ᕤ ⸨

[°C]
8
4
0-4

5月 6~8月
2005年

9~11月

12~2月
3~5月
2006年

ᅗ㸴 UZ4 ࡜ UZ1 ࡜ࡢ᪥ࠎࡢኪ㛫Ẽ

6~8月

ᕪࠋྑୖ㒊ࡢᲬࡣ UZ1 ࡀḞ

9~11月

12~2月 3~4月
2007年

ࡢᮇ㛫ࢆ⾲ࡍࠋ௜㘓

気温ẚ‵ࡢ᫬⣔ิᮏ◊✲ࡢほ Ⅼ࡟࠾࠸࡚㸪Ẽ ࡟ຍ࠼࡚‵ᗘࡢほ ࢆ⾜ࡗࡓࠋࡑࡢ㝿㸪ኪ㛫࡟┅ᗏࡢࡳ࡟ప࡛‵₶࡞✵Ẽࡀࡳࡽࢀࡿ౛ࡀ࠶ࡗࡓࠋࡑࡢ㢧ⴭ࡞౛ࢆᅗ A1 ࡟♧ࡍ㸦ẚ‵ࡣ✵Ẽ୰࡟ྵࡲࢀࡿỈ⵨Ẽࡢ㔞ࢆ㉁㔞ẚ࡛⾲ࡋࡓࡶࡢ㸧ࠋ┅ᗏࡢࡳ࡟࠾࠸࡚ኪ㛫࡟㝆 ࡜ẚ‵ୖ᪼ࡀࡳࡽࢀࡿࠋࡇࡢࡇ࡜ࡣ㸪┅ᗏࡢࡳ࡟ከࡃࡢỈ⵨ẼࡀὶධࡲࡓࡣⓎ⏕ࡋ࡚࠸ࡿࡇ࡜ࢆព࿡ࡍࡿࠋ‵ᗘࢆྵࡴほ ࡣ 2007 ᖺ 4 ᭶ 15 ᪥㹼6 ᭶ 14 ᪥࡜ 2009 ᖺ 10 ᭶ 21 ᪥㹼2010 ᖺ 1 ᭶ 5 ᪥࡟⾜ࡗࡓࠋ๓⪅ࡢᮇ㛫࡟ࡣ㸪┅ᗏࡢࡳ࡟ప ࣭㧗ẚ‵ࡢ✵Ẽࡀࡳࡽࢀࡿኪࡀ 11 ᅇࡳࡽࢀࡿࠋᚋ
⪅ࡢᮇ㛫࡟ࡣྠᵝࡢ౛ࡀ 6 ᅇࡳࡽࢀࡿࡀ㸪┅ᗏ࡜୰⭡࡜ࡢẚ‵ᕪࡣ኱ࡁࡃ࡞࠸ࠋ
[℃]┅ᗏࡢ‵₶✵ẼࡢⓎ⏕࣓࢝ࢽࢬ࣒ࡣ୙࡛᫂㸪30a.
௒ᚋࡢㄢ㢟࡛࠶ࡿࠋ኱ᶫ࡯࠿㸦2004㸧ࡣ㸪୕
UZ320ḟ┅ᆅ࡟࠾ࡅࡿ㟝ࡢⓎ⏕ࢆᩘ್ࢩ࣑࣮ࣗࣞࢩ
UZ5࡛ࣙࣥ෌⌧ࡋ㸪┅ᆅእࡢᅵተ࣭᳃ᯘࢆ㉳※࡜
UZ710ࡍࡿỈ⵨Ẽࡀኪ㛫࡟┅ᗏ࡬ὶධࡍࡿࡇ࡜ࢆ♧UZ1ࡋࡓࠋ㔝ὠཎࡢ┅ᆅ࡟ࡣ㟝ࡢⓎ⏕ࡣ࠶ࡲࡾぢ0ࡽࢀ࡞࠸ࡀ㸪㢮ఝࡢ⌧㇟ࡀ࠾ࡇࡗ࡚࠸ࡿྍ⬟[× 1E-3]ᛶࡀ⪃࠼ࡽࢀࡿࠋࡲࡓ㸪┅ᆅෆ࡛ࡢᒁᡤⓗ࡞15b.
Ỉ⵨ẼⓎ⏕ࡢྍ⬟ᛶࡶ⪃࠼ࡽࢀࡿࠋㅰ㎡ᮏ◊✲࡟࠶ࡓࡾ㸪ᕝす༤ྡ㄃ᩍᤵ㸦኱ศ኱Ꮫ㸧࡟ࡣ㈗㔜࡞ຓゝࢆ࠸ࡓࡔࡁࡲࡋࡓࠋ༞ᴗ比湿1050ࢆ⾜࠸ࡲࡋࡓࠋ༞ᴗ⏕ࡢᚋᕝ㔛⨾ࡉࢇࡣ 2009 ᖺࡢほ࡟ᦠࢃࡾࡲࡋࡓࠋୖグࡢ᪉ࠎ࡟῝ࡃឤㅰࡋࡲࡍࠋUZ3
UZ7

4/284/29
日付 （2007年）⏕ࡢᯇỌᐶ⨾ࡉࢇࡣ㸪ᅾᏛ᫬࡟ᮏ◊✲ࡢᇶ♏
࡜࡞ࡿほUZ1ᅗ㸿㸯 (a)Ẽ

࡜(b)ẚ‵ࡢ᫬㛫ኚ໬ࡢほ౛ࠋᏱ᭮ᓅ໭すᩳ㠃࡟࠾ࡅࡿᩳ㠃ᬮᖏࡢ㏻ᖺほ137ཧ⪃ᩥ⊩1) ᇼṇᓅ㸪᳜⏣ᏹ᫛㸪㔝ཎ኱㍜㸪2006㸬⟃Ἴᒣすഃᩳ㠃࡟࠾ࡅࡿᩳ㠃 ᬮᖏࡢⓎ⏕㢖ᗘ࡜᫬㛫ኚ໬≉ᛶ㸪ᆅ⌮Ꮫホㄽ㸪79㸪26-38㸬2) ᕝす༤㸪1994. ኱ศ┴ࡢẼ㇟᥈ゼ㸪኱ศྜྠ᪂⪺♫㸬3) Kobayashi, T., M. Mori and K. Wakimizu, 1994. An observational study of a thermal belt on
hillsides, J. Meteor. Soc. Japan, 72, 387-399.
4) ᱓ᙧᜏ⏨㸪1994㸬」㞧ᆅᙧ࡜኱Ẽ㸪㏆⸨⣧ṇ⦅ⴭ㸸Ỉ⎔ቃࡢẼ㇟Ꮫ㸪ᮅ಴᭩ᗑ㸪261-280.
5) ᯇỌᐶ⨾㸪2002㸬㔝ὠཎ⏫ࡢẼ㇟㹼⏫࿘㎶㒊࡟ࡳࡽࢀࡿẼ ࡢ㏫㌿㹼㸪኱ศ኱Ꮫᩍ⫱Ꮫ㒊༞ᴗㄽᩥ㸬6) Mori, M. and T. Kobayashi, 1996. Dynamic interaction between observed nocturnal drainage
winds and a cold air lake, J. Meteor. Soc. Japan, 74, 247-258.
7) ኱ᶫ၏ኴ㸪ᑎᑿᚭ㸪ᐑ⏣㈼஧㸪⏣୰ṇ᫛㸪ᇼཱྀග❶㸪ᯘὈ୍㸪2004㸬ᒁᆅᚠ⎔࡟ࡼࡿỈ⵨Ẽ㍺㏦࡜┅ᆅ㟝Ⓨ⏕ࡢ㛵㐃ᛶ̿ᗈᓥ┴୕ḟ┅ᆅࢆᑐ㇟࡜ࡋࡓᩘ್ᐇ㦂̿㸪ኳẼ㸪51㸪509-523㸬
8) ⏣୰༤᫓㸪㇂ᮏ㝧୍㸪୕ୖᓅᙪ㸪2000㸬ඵࣨᓅ༡㯄࡟࠾ࡅࡿ㧗ᶆ㧗Ẽ ㏫㌿⌧㇟㸪ᆅᏛ㞧ㄅ㸪
109㸪703-718.
9) Ueda, H., M.E. Hori and D. Nohara, 2003. Observational study of the thermal belt on theslope of Mt. Tsukuba, J. Meteor. Soc. Japan, 81, 1283-1288.
10) ྜྷ㔝ṇᩄ㸪1986㸬᪂∧ᑠẼೃ㸪ᆅே᭩㤋㸬Year-round Observations of the Thermal Belt on theNorthwestern Slope of Mt. Uzou-dake in Notsuharu Area
NISHIGAKI, Hajime and KUDOH, Daisuke

Abstract
A time series of air temperatures were observed in the area
extending from the valley of Notsuharu, Oita, Japan to the northwestern
slope of nearby Mt. Uzou-dake over a period of nearly 2 years. We focusedon the thermal belt, a phenomenon in which the air temperature is higher
in the mid-slope than in the bottom of the valley. Certain properties(including their seasonal changes) of the thermal belt in this area, namely,
the frequency, the elevation of the warmest area and the intensity, aremade clear for the first time. The thermal belt was observed on nearly
half of the days on which observations were made. Its frequency is small
in summer and large from autumn to spring. The warmest area is mostly
present about 250 m above the bottom of the valley. The intensity of thethermal belt is small in summer and large from autumn to spring. Typicaltemperature difference between the warm area and the bottom of the138

す ᇉ࣭ᕤ ⸨valley is 4ï6 degrees Celsius in the intense seasons.
䛆Key wordsࠚ  thermal belt, inversion layer, seasonal change, valley,
micrometeorology