㻌➨  ᅇᅵ◁⅏ᐖ࡟㛵ࡍࡿࢩ࣏ࣥࢪ࣒࢘ㄽᩥ㞟㸪 ᖺ  ᭶㻌ᖹᯈୖ࡟タ⨨ࡉࢀࡓᵓ㐀≀ࢆ㎽ᅇࡍࡿ
⁐ᒾὶࡢὶື≉ᛶ࡟㛵ࡍࡿᐇ㦂ⓗ◊✲
EXPERIMENTAL STUDY INTO THE CHARACTERISTCS OF LAVA FLOWCIRCUMVENTING THE STRUCTURE ON THE FLAT PLATE㻌ụᮏᩔဢ ࣭Ọ㔝༤அ ࣭ᰗཎ㥴ኴ ࣭ⱱᮌ㝧ᖹ ࣭すᑿ㝧௓ ࣭బ⸨ᩄ᫂ Atsuya IKEMOTO, Hiroyuki NAGANO, Hayata YANAGIHARA, Yohei MOGI,Yosuke NISHIO and Toshiaki SATOᮾ໭኱Ꮫ኱Ꮫ㝔ᕤᏛ◊✲⛉ᅵᮌᕤᏛᑓᨷ㸦ࠛ ௝ྎᕷ㟷ⴥ༊ⲨᕳᏐ㟷ⴥ 㸧E-mail: ikemoto.atsuya.s1@dc.tohoku.ac.jp⩌㤿ᕤᴗ㧗➼ᑓ㛛Ꮫᰯ⎔ቃ㒔ᕷᕤᏛ⛉㸦ࠛ ๓ᶫᕷ㫽⩚⏫  ␒ᆅ㸧E-mail: hr-nagano@gunma-ct.ac.jpᮾ໭኱Ꮫ኱Ꮫ㝔ᕤᏛ◊✲⛉ᅵᮌᕤᏛᑓᨷ㸦ࠛ ௝ྎᕷ㟷ⴥ༊ⲨᕳᏐ㟷ⴥ 㸧E-mail: yanagihara.hayata.r1@dc.tohoku.ac.jp⩌㤿ᕤᴗ㧗➼ᑓ㛛Ꮫᰯᑓᨷ⛉㸦ࠛ ๓ᶫᕷ㫽⩚⏫  ␒ᆅ㸧ඵ༓௦࢚ࣥࢪࢽࣖࣜࣥࢢ㸦ࠛ ྎᮾ༊ὸⲡᶫ 㸧㻌

Key Words: lava flow, flow experiment, structural countermeasures, flat channel㻌㸬ࡣࡌࡵ࡟㐀≀ࡢᖜࡣ༢୍ࡢ኱ࡁࡉ࡟㝈ࡽࢀ࡚࠾ࡾ㸪ᵓ㐀≀࡟ᤕᤊࡉࢀࡿ⁐ᒾὶࡢᣲື࡟ࡘ࠸࡚㸪ᵓ㐀≀ࡢㅖඖࢆ⁐ᒾὶ⅏ᐖ࡟࠾ࡅࡿࣁ࣮ࢻᑐ⟇࡜ࡋ࡚㸪ᅵ◁⅏ᐖ

㋃ࡲ࠼ࡓ᳨ウࢆ⾜࠺࡟ࡣ⮳ࡗ࡚࠸࡞࠸㸬ᮏ◊✲ࡣ㸪ᑐ⟇᪋タࡢά⏝ࡀᮇᚅࡉࢀ࡚࠸ࡿࡀ㸪ຠᯝⓗ࡞ᑐ⟇⁐ᒾὶ⅏ᐖ࡟ᑐࡋ࡚ຠᯝⓗ࡞ᶓ᩿ᵓ㐀≀ࡢ᪋タ㓄⨨᪋タࡢᵓ㐀ᙧ≧ࡣ᫂ࡽ࠿࡛࡞࠸㸬ᰩཎࡽ 1)ࡣ㸪ᩘ್ࢆ᳨ウࡍࡿࡇ࡜ࢆ᭱⤊ⓗ࡞┠ⓗ࡜ࡋࡓⴭ⪅ࡽࡢ◊✲ࢩ࣑࣮ࣗࣞࢩࣙࣥ࡟ຍ࠼㸪⢭ᐦᶍᆺᐇ㦂࡟ࡼࡾᑐ⟇ࡢᘏ㛗ୖ࡟࠶ࡿ㸬᪤ ◊✲࡜ࡣᖜࡢ␗࡞ࡿ┤᪉యࡢ᪋タࡢ᳨ウࢆ㐍ࡵ࡚࠸ࡿࡶࡢࡢ㸪ࡇࡢࡼ࠺࡞஦౛ࡣᵓ㐀≀ࢆタ⨨ࡋࡓᖹᯈὶ㊰ୖࡢὶືᐇ㦂࠿ࡽ㸪┤᪉ከࡃ࡞࠸㸬ࡲࡓ㸪㧗ὶయࢆ⏝࠸ࡓὶືᐇ㦂ࡶከࡃయࡢᵓ㐀≀࡟ᤕᤊࡉࢀࡿ⁐ᒾὶࡢὶື≧ἣ࡟ࡘ࠸࡚ࡣ࡞࠸㸬ᾏእ࡛ࡣ㸪⁐㖔⅔࡛ຍ⇕⏕ᡂࡋࡓ⁐ᒾࢆ⏝᳨ウࡋ㸪ὶື࣭ሁ✚≉ᛶ࡟㛵ࡍࡿࡉࡽ࡞ࡿ▱ぢࡢ㞟࠸ࡓὶືᐇ㦂஦౛ὶయࢆ⏝࠸ࡓᐇ✚ࢆヨࡳࡓ㸬ࡇࢀࡣ㸪ᖜࡀ⊃࠸ᒁᡤⓗ࡞ᵓ㐀≀࠿ࡽ㸪㸪ᩘ್ࢩ࣑࣮ࣗࣞࢩࣙࣥሐ㜵ࡢࡼ࠺࡞⥺≧ࡢᵓ㐀≀ࡲ࡛㐃⥆ⓗ࡟㆟ㄽࡍࡿࡇ࡟ࡼࡿ᳨ウࡀከ࠸࡜⪃࠼ࡽࢀࡿ㸬ࡇࡢࡼ࠺࡞⫼ᬒ࠿࡜ࢆ┠ᣦࡍࡶࡢ࡛࠶ࡿ㸬ࡲࡓ㸪௒ᚋ㸪ᐇ㦂ࢫࢣ࣮ࣝࡽ㸪⁐ᒾὶࡢὶື࣭ሁ✚≉ᛶ࡟㛵ࡍࡿᐇ㦂ⓗ࡞▱ぢ࡜ᐇࢫࢣ࣮ࣝࡢ㆟ㄽࢆ⤖ࡧࡘࡅࡿࡓࡵ࡟㸪ὶືࢆつࡢ୙㊊ࢆ⿵࠺ࡓࡵ㸪ⴭ⪅ࡽࡣ㧗ᐃࡍࡿࣃ࣓࣮ࣛࢱ࡛࠶ࡾ㸪2)ࡶ࠶ࡿࡀ㸪㧗㦂ࡀ୍⯡࡟ࡣᅔ㞴࡞ࡓࡵ3)ὶయࢆ⏝࠸ࡓὶື

ᐇ㦂࡟ࡼࡾ⁐ᒾὶࡢὶື≉ᛶ࡟ࡘ࠸᳨࡚ウࡋ࡚ࡁࡓ4) - 7)㸬ࡑࢀࡽࡢ᳨ウ࡛ࡣ㸪ỏ℃ཎࢆ᝿ᐃࡋࡓᖹᯈὶᗘ࡜ࡢ㛵ಀࡀᙉ࠸⢓ᛶಀᩘࡢ㆟ㄽࡀᚲせ࡜࡞ࡿ㸬ࡇࡢࡓࡵ㸪ⴭ⪅ࡽࡢ᪤ ◊✲ࢆྵࡵ࡚㸪⾲㠃ᗘࡢほⅬ࠿ࡽ㸪⁐ᒾὶࡢὶື

㊰࡟ᵓ㐀≀ࢆタ⨨ࡋ㸪ᵓ㐀≀ࡢୖὶഃ࡟ᤕᤊࡉࢀࡿ

࡟㛵ࡍࡿᇶᮏⓗ࡞≉ᛶࢆ෌ᩚ⌮ࡋ㸪ᮏ◊✲࡛ᐇ᪋ࡋ⁐ᒾὶࡸ㸪ᵓ㐀≀ࡢୗὶ࡟ὶฟࡍࡿ⁐ᒾὶࡢᇶ♏ⓗࡓᐇ㦂࡜࠶ࢃࡏ࡚⤫୍ⓗ࡟᳨ウࡍࡿࡇ࡜࡛㸪௒ᚋࡢ࡞▱ぢࡢ㞟✚ࢆヨࡳ࡚࠸ࡿ⁐ᒾὶ⅏ᐖᑐ⟇࡟㈨ࡍࡿࡇ࡜ࢆ┠ᣦࡍࡶࡢ࡛࠶ࡿ㸬5) - 7)㸬ࡋ࠿ࡋ࡞ࡀࡽ㸪ᵓ― 161 ―㸬ᐇ㦂ᴫせᶓ᩿ᵓ㐀≀ᮏ◊✲࡛ࡢᐇ㦂ࢣ࣮ࢫࢆ⾲ ࡟♧ࡍ㸬ᮏ◊✲࡛ࡣᵓ㐀≀ࡢᖜ 10cm ࡢࢣ࣮ࢫ㸦CASE1-3㸪CASE2-3㸧ࢆ

flow3cmࢫࢸࣥࣞࢫࣅ࣮࢝

3cm5cm㊰ᗋᐇ᪋ࡋࡓ㸬ࡑࢀ௨እࡣ᪤ ◊✲ 5) - 7)ࡢᐇ㦂࡛࠶ࡿ㸬⁐ᒾࡣ㸪⼥Ⅼ㝆ୗ๣࡛࠶ࡿ㔜᭪࣭࣍࢘◁ࢆຍ࠼ࡓᕝ

20cm◁ࢆ࠸ࢀࡓࢫࢸࣥࣞࢫࣅ࣮࢝ࢆ㸪ᮌⅣࢆᩜࡁワࡵࡓ

10r
(15r)

20cm

⁐㖔⅔ෆ࡛ຍ⇕ࡋ࡚⏕ᡂࡋࡓ㸬ຍ⇕๓ࡢྛ㔜㔞ࡣ㸪

100cm

ᕝ◁ 540g㸪㔜᭪ 270g㸪࣍࢘◁ 540g ࡛࠶ࡿ㸬ᐇ㦂ὶᅗ ᐇ㦂࡟⏝࠸ࡓᖹᯈὶ㊰ࡢᶍᘧᅗ㸦ഃ㠃ᅗ㸧㊰ࡢᶍᘧᅗࢆᅗ ࡟♧ࡍ㸬ᮏ◊✲࡛ࡣ㸪ᖹᯈὶ㊰ࢆ⾲ ᐇ㦂᮲௳⏝࠸㸪ὶ㊰໙㓄ࡣ 10r࠾ࡼࡧ 15r࡜ࡋࡓ㸬ὶ㊰ࡣ㸪

CASE

ὶ㊰ᘏ㛗 100cm㸪ὶ㊰ᖜ 60cm ࡛࠶ࡾ㸪ᮌ〇ྜᯈ࡟໙㓄
㹙r㹛

ᵓ㐀≀ࡢᖜ
㹙cm㹛

ึᮇ ᗘ
㹙℃㹛

౪⤥㔞
㹙mL㹛

-952.7340

5858.6330⢏ᚄ 2mm ᮍ‶ࡢᕝ◁ࢆཌࡉ 5cm ࡛ᩜタࡋࡓ㸬⁐ᒾ

1-1ὶࡣ㸪⁐㖔⅔࠿ࡽྲྀࡾฟࡋࡓࢫࢸࣥࣞࢫࣅ࣮࢝ࢆ㸪

1-2

ὶ㊰ࡢୖὶ➃࠿ࡽ 20cm ᆅⅬ࡟࠾࠸࡚ᡭసᴗ࡛ഴࡅ

1-310933.8

360

2-1-947.2

350

5980.0350

10878.6360

࡚Ⓨ⏕ࡉࡏࡓ㸬Ᏻ඲ᛶࡢࡓࡵ౪⤥㔞ࡣ 350ml ⛬ᗘ࡜ࡋࡓ㸬┤᪉యᵓ㐀≀ࡣ㧗ࡉ 3cm㸪ዟ⾜ࡁ㸦⦪᩿᪉ྥ㸧

103cm㸪ᖜ㸦ᶓ᩿᪉ྥ㸧10cm ࡛ᡴタࡋࡓࣔࣝࢱࣝࣈࣟ

2-2

ࢵࢡࢆὶ㊰࡟タ⨨ࡋࡓ㸬┤᪉యᵓ㐀≀ࡢୖὶഃࡢ㠃

2-3㸦௨ୗ㸪ᤕᤊ㠃࡜⛠ࡍ㸧ࡢ఩⨨ࡣ㸪౪⤥ᆅⅬ࠿ࡽ 20cm

CASE1-2 ࡟࠾࠸࡚㸪ᵓ㐀≀ࡢᤕᤊ㠃࠿ࡽୗὶഃࡢ

ᆅⅬ࡛࠶ࡿ㸬⁐ᒾὶࡢึᮇ

15ᗘࡣ㸪ὶ㊰ୖ᪉࠿ࡽ㉥㠃ࡢ఩⨨ࡲ࡛ࢆὶୗࡍࡿ⁐ᒾὶࣇࣟࣥࢺ㒊ࡣ㸪ᚎࠎእ⥺ࢧ࣮ࣔࢢࣛࣇ࢕㸦FLIR 〇 CPA T-440㸪ᨺᑕ⋡ 0.9㸧࡟ᖜࢆᗈࡆ࡞ࡀࡽὶୗࡋࡓ㸬ୗὶഃࡢ㠃ࡢ఩⨨ࢆ㏻ࢆ⏝࠸࡚ィ㐣ࡋࡓࡢࡕ㸪⁐ᒾὶࣇࣟࣥࢺ㒊ࡣ㸪ὶ㊰ࡢ୰ᚰഃ࡟ࡋࡓ㸬౪⤥ᆅⅬࡢ⁐ᒾึᮇᗘࡢィ್ࢆ⾲ ࡟࠶ࢃࡏ࡚♧ࡋࡓ㸬ᮏ◊✲࡛ࡣ㸪ᨺᑕィ AD-5634)࡟ࡼࡾຍ⇕୰ࡢヨᩱᗘྥ࠿ࢃࡎࡑࡢࡲࡲὶୗࡋ㸪ࡸࡀ࡚೵Ṇࡋࡓ㸬ᗘࢆ㐺ᐅ☜ㄆࡋ

CASE1-3 ࡛ࡣ㸪฿㐩㊥㞳ࡀᕥᓊ࡜ྑᓊ࡛␗࡞ࡿ㸬࡞ࡀࡽヨᩱࢆᡭసᴗ࡛᧠ᢾࡋ㸪ᕝ◁ࡢ⼥ゎ⤊஢ࢆุࡇࢀࡣ㸪ᡭసᴗ࡟ࡼࡿ⁐ᒾ౪⤥᫬࡟㸪౪⤥ࡉࢀࡓ⁐᩿ࡋࡓẁ㝵࡛ὶ㊰࡟౪⤥ࡋࡓࡓࡵ㸪ึᮇᒾࡀὶ㊰ࡢ୰ᚰࡼࡾࡶྑᓊ࡟ᐤࡗ࡚࠸ࡓࡓࡵ࡛࠶ࡿ㸬ᗘࡣ ⾲࡟グ㍕ࡋࡓ⛬ᗘࡢࡤࡽࡘࡁࡀ⏕ࡌࡿ㸬⁐ᒾࡢὶୗ≧ᕥᓊ࡟ࡘ࠸࡚㸪ὶฟࡋࡓ⁐ᒾὶࣇࣟࣥࢺ㒊ࡣ㸪ᤕᤊἣࡣ㸪ὶ㊰ୖ᪉㸪ὶ㊰ྑᓊഃ᪉࡟タ⨨ࡋࡓࣅࢹ࢜࢝㠃࡟฿㐩ᚋ㸪ὶୗ᪉ྥࢆᵓ㐀≀ࡢᤕᤊ㠃࡟ἢࡗࡓᶓ࣓ࣛ࡟ࡼࡾ᧜ᙳࡋࡓ㸬ᐇ㦂⤊஢ᚋ㸪ᅛ⤖ࡋࡓ⁐ᒾࡢ᩿᪉ྥ࡬࡜ྥࡁࢆኚ࠼࡚ὶືࡋࡓᚋ㸪ᖜࢆᗈࡆ࡞ࡀయ✚㸪฿㐩㊥㞳㸪ሁ✚ཌ࡜ሁ✚ᖜࢆィࡽὶୗࡋ࡚ࡃࡿᚋ⥆ࡢ⁐ᒾὶ࡜ྜὶࡋ࡚ᵓ㐀≀ࡢྑࡋࡓ㸬ሁ✚ཌ࣭ሁ✚ᖜࡣ㸪౪⤥ᆅⅬ࠿ࡽ 1cm ࣆࢵࢳ࡛ィࡋࡓ㸬ᓊ࠾ࡼࡧᕥᓊ࠿ࡽὶୗࡋࡓ㸬ᵓ㐀≀ࡢᕥᓊ࡟ὶฟࡋࡓ⁐ᒾὶࡣ㸪ᚋ⥆ࡢ⁐ᒾὶ࡜ྜὶࡋࡓࡢࡕ㸪ᶓ᩿᪉㸬ᐇ㦂⤖ᯝྥ࡟ᖜࢆᗈࡆ࡚ୗὶ࡟ὶฟࡋࡓ㸬ୗὶ࡟ὶฟࡋࡓ⁐ᒾὶࡣ㸪ྑᓊ㸪ᕥᓊ࡜ࡶ࡟ὶ㊰ࡢ୰ᚰ࡟ྥ࠿ࡗ࡚ὶὶື୰ࡢ⁐ᒾὶࡢᵝᏊୗࡋ㸪ᵓ㐀≀ࢆ㎽ᅇࡍࡿࡼ࠺࡟ሁ✚ࡋࡓ㸬ᵓ㐀≀ࢆタ⨨ࡋࡓࢣ࣮ࢫ࡟࠾ࡅࡿ㸪⁐ᒾࡢὶື≧CASE2-2 ࡢ⁐ᒾὶࡣ㸪⁐ᒾὶࡢࣇࣟࣥࢺ㒊௜㏆࡟ἣࡢ㉥እ⥺ࢧ࣮ࣔࢢࣛࣇ࢕⏬ീࢆᅗ ࡟♧ࡍ㸬࠸ࡎẼἻࡀⓎ⏕ࡋࡓ㸬ᵓ㐀≀࡟ᤕᤊࡉࢀࡓᚋࡶ㸪ẼἻࢆࢀࡢࢣ࣮ࢫ࡛ࡶ㸪ࢫࢸࣥࣞࢫࣅ࣮࢝࠿ࡽ⁐ᒾࡀ౪⤥Ⓨ⏕ࡉࡏ࡞ࡀࡽὶୗࡋࡓ㸬ᵓ㐀≀࡟ᤕᤊࡉࢀࡓ⁐ᒾࡉࢀ㸪ὶ㊰ࢆὶୗࡍࡿ⁐ᒾὶࡢእ⦕ࡣᴃ෇ᙧ≧ࢆ࿊ࡀୗὶ࡟ὶฟࡍࡿ๓࡟㸪ᚋ⥆ὶࡀୗὶ࡟ὶฟࡋࡓ㸬ࡋ㸪እ⦕ࢆ኱ࡁࡃࡋ࡞ࡀࡽὶୗࡋࡓ㸬౪⤥㛤ጞ┤ᚋ㸪ୗὶ࡟ὶฟࡋࡓ⁐ᒾὶࡣ㸪ᚎࠎ࡟ὶ㊰ࡢ୰ᚰ࡟ྥ࠿

CASE1-2 ࡜ CASE2-3 ࡢ⁐ᒾࡣ㉥㗵Ⰽ㸪CASE1-3 ࡜ࡗ࡚ὶୗࡋ㸪ᵓ㐀≀ࢆ㎽ᅇࡍࡿࡼ࠺࡟ሁ✚ࡋࡓ㸬

CASE2-2 ࡢ⁐ᒾࡣ᫂ࡿ࠸ᶳⰍ࡛࠶ࡾ㸪ึᮇᗘ㸦⾲

CASE2-3 ࡟࠾࠸࡚㸪ᵓ㐀≀ࡢୗὶ࡟ὶฟࡋࡓ⁐ᒾ㸧ࡢ㐪࠸࡟ࡼࡿ࡜⪃࠼ࡽࢀࡿ㸬ὶୗ㛤ጞ௨㝆㸪⁐ὶࡣ㸪ᚎࠎ࡟ᖜࢆᗈࡆ࡚ሁ✚ࡋࡓ㸬ᵓ㐀≀ࡢୗὶ࡟ᒾὶࡣእ⦕࠿ࡽⰍࢆ⃰ࡃࡋ㸪㯮Ⰽ࡟࡞ࡗ࡚೵Ṇࡋࡓ㸬ὶฟࡋࡓ⁐ᒾὶࡣ㸪ࢃࡎ࠿࡟ὶ㊰ࡢ୰ᚰ࡟ྥ࠿ࡗ࡚

ࡲࡓ㸪ᅗ ୰ࡢ CASE1-3 ࡜ CASE2-2 ࡢ㯮࠸ᩬ≧ࡢὶୗࡋ㸪ᵓ㐀≀ࢆ㎽ᅇࡍࡿࡼ࠺࡟ሁ✚ࡋࡓ㸬࠸ࡎࢀపࡢࢣ࣮ࢫࡶ㸪ᵓ㐀≀ࡢྑᓊ࠾ࡼࡧᕥᓊ࠿ࡽὶฟࡋࡓ

ᇦࡣ㸪ẼἻ࡛࠶ࡿࡀⓎ⏕ཎᅉࡣ୙࡛᫂࠶ࡿ㸬― 162 ―ᵓ㐀≀

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㸦D㸧&$6( ὶ㊰໙㓄 r㸪ᵓ㐀≀ࡢᖜ FP1000

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㸦E㸧&$6( ὶ㊰໙㓄 r㸪ᵓ㐀≀ࡢᖜ FP
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㸦F㸧&$6( ὶ㊰໙㓄 r㸪ᵓ㐀≀ࡢᖜ FP
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800

800

㸦G㸧&$6( ὶ㊰໙㓄 r㸪ᵓ㐀≀ࡢᖜ FPᅗ ὶື୰ࡢ⁐ᒾὶࡢᵝᏊ㸦ᕥ࠿ࡽὶୗ㛤ጞࡼࡾ 㻡 ⛊ᚋ㸪㻝㻜 ⛊ᚋ㸪㻝㻡 ⛊ᚋ㸪㻞㻜 ⛊ᚋ㸧50࣮ࢫ࡛ࡶ㸪ࣇࣟࣥࢺ㒊ࡢ೵Ṇᚋࡶ㸪ࣇࣟࣥࢺ㒊ࡼࡾୖὶࡢ⁐ᒾࡢὶື῝ࡣኚ໬ࢆ⥆ࡅࡓ㸬ࡇࢀࡣ㸪ࣇࣟࣥࢺ㒊ࡼࡾୖὶࡢ⁐ᒾࡀ㸪ࣇࣟࣥࢺ㒊೵Ṇᚋࡶὶືࢆ⥆ࡅ㸪ᚎࠎ࡟ୗὶ࡟⁐ᒾࡀὶୗࡋ࡚࠸ࡓࡓࡵ࡛࠶ࡿ㸬ᤕᤊ㠃௨㝆ࡢ⯉≧㒊࡛ࡣ㸪እ⦕㒊ࡼࡾࡶෆഃࡢ᪉ࡀ㧗࡞ഴྥ࡟࠶ࡿ㸦ᅗ㸧㸬⁐ᒾὶࡣ㧗

ὶୗ㊥㞳㹙cm㹛⁐ᒾࡣ㸪⯉≧ࢆ࿊ࡋ࡚ὶୗࡋࡓ㸬ࡲࡓ㸪࠸ࡎࢀࡢࢣ࡯࡝⢓40

30
CASE1-1
CASE1-2_ᕥᓊ
CASE1-2_ྑᓊ
CASE1-3_ᕥᓊ
CASE1-3_ྑᓊ

201000ᛶࡀᑠࡉࡃ㸪ὶືᛶࡀ㧗࠸ࡇ࡜ࡀ▱ࡽࢀ࡚࠾ࡾ㸪෭༷ࡢ㐍⾜࡟క࠸ὶືᛶࡀపୗࡍࡿ㸬ෆഃࡢ⁐ᒾࡣࣇ
50ࣥࢺ㒊೵Ṇᚋࡶ㸪ෆഃࡢ⁐ᒾࡢὶືࡣ⥅⥆ࡋࡓ㸬ึ

40ᮇᗘࡣ⾲ ࡟♧ࡍ⛬ᗘࡢࡤࡽࡘࡁ࡛࠶ࡿࡀ㸪ࡇࢀࡽࡢᣲື࡟୚࠼ࡿᙳ㡪࡟ࡘ࠸࡚ࡣ௒ᚋࡢㄢ㢟࡛࠶ࡿ㸬 ὶୗ㊥㞳ࡢ᫬⣔ิኚ໬

ὶୗ㊥㞳㹙cm㹛ࣟࣥࢺ㒊ࡢ⁐ᒾࡼࡾࡶ෭༷ࡢ㐍⾜ࡀ㐜࠸ࡓࡵ㸪ࣇࣟᖹᯈὶ㊰ୖ㠃࠿ࡽ᧜ᙳࡋࡓື⏬࠿ࡽ㸪ྛࢣ࣮ࢫࡢ

1020⤒㐣᫬㛫㹙sec㹛㸦D㸧໙㓄 㼻ࡢࢣ࣮ࢫ

3030
CASE2-1
CASE2-2_ᕥᓊ
CASE2-2_ྑᓊ
CASE2-3_ᕥᓊ
CASE2-3_ྑᓊ

201000ኚ໬ࢆᅗ ࡟♧ࡍ㸬CASE1-2 ࡛ࡣᕥᓊ㸪ྑᓊ࡜ࡶ࡟

1020⤒㐣᫬㛫㹙sec㹛㸦E㸧໙㓄 rࡢࢣ࣮ࢫᅗ ὶୗ㊥㞳ࡢ᫬⣔ิኚ໬㞳 ᫬ኚ

6.5 ⛊㹼8.0 ⛊㸪CASE1-3 ࡢᕥᓊ࡛ࡣ 4.5 ⛊㹼8.5 ⛊ࡢὶୗ㊥㞳ࡀᶓࡤ࠸࡟࡞ࡗ࡚࠸ࡿ㸬ࡇࢀࡣ㸪⁐ᒾὶࡢ㛫࡛ὶୗ㊥㞳ࡀᶓࡤ࠸࡟࡞ࡗ࡚࠸ࡿ㸬CASE2-2 ࡛ࡣὶୗࣇࣟࣥࢺ㒊ࡀᵓ㐀≀࡟ᤕᤊࡉࢀ㸪㐍⾜᪉ྥࡀ⦪2.0 ⛊㹼2.5 ⛊࡛㸪CASE2-3 ࡛ࡣ 4.0 ⛊㹼5.5 ⛊ࡢ㛫࡛᩿᪉ྥ࠿ࡽᶓ᩿᪉ྥ࡟ษࡾ᭰ࢃࡗࡓࡓࡵ࡛࠶ࡿ㸬⁐ᒾὶࡢὶୗ㊥㞳ࡢ᫬⣔ิኚ໬ࢆྲྀᚓࡋࡓ㸬ὶ㊰໙㓄ࡀ 10r࠾ࡼࡧ 15rࡢࢣ࣮ࢫࡢὶୗ㊥㞳ࡢ᫬⣔ิ

― 163 ―30

CASE1-2㸪CASE2-2 ࡼࡾࡶ CASE1-3㸪CASE2-3 ࡢ᪉⾲ ሁ✚⤖ᯝ
⾲㸦D㸧໙㓄 rࡢࢣ࣮ࢫࡀ㸪ὶୗ㊥㞳ࡀኚ໬ࡋ࡞࠸᫬㛫ࡀ㛗࠸㸬ࡇࢀࡣ㸪ᵓ㐀≀ࡢᖜࡀᗈࡃ㸪ὶୗࣇࣟࣥࢺ㒊ࡀᶓ᩿᪉ྥ࡬㐍⾜ࡍࡿ㊥㞳ࡀ㛗ࡃ࡞ࡿࡓࡵ࡛࠶ࡿ㸬ᮏ◊✲࡛⏕ᡂࡋࡓ

CASE

฿㐩㊥㞳
㹙cm㹛

ሁ✚ᖜ
㹙cm㹛

ሁ✚ཌ
㹙cm㹛

1-1

29.1

᭱኱ W㸸19.2
ᖹᆒwഥ㸸15.8

᭱኱ D㸸0.8
ᖹᆒ ഥd㸸0.6

1-2

ྑᓊ㸸29.1
ᕥᓊ㸸29.0᭱኱ W㸸18.7
ᖹᆒwഥ㸸14.7

᭱኱ D㸸1.3
ᖹᆒ ഥd㸸0.7

1-3

ྑᓊ㸸37.2ᕥᓊ㸸29.0᭱኱ W㸸20.7
ᖹᆒwഥ㸸13.6

᭱኱ D㸸1.1
ᖹᆒ ഥd㸸0.6⁐ᒾࡀᖹᯈὶ㊰ࢆὶୗࡍࡿሙྜ㸪ὶ㊰࡟タ⨨ࡍࡿᖜࡀ኱ࡁ࠸࡯࡝㸪⁐ᒾὶࡀᵓ㐀≀࡟ᤕᤊࡉࢀ࡚࠿ࡽୗ
ὶ࡟ὶฟࡍࡿࡲ࡛ࡢ᫬㛫ࡀ㛗ࡃ࡞ࡿ࡜⪃࠼ࡽࢀࡿ㸬 ሁ✚⤖ᯝ⾲ ࡟ሁ✚⤖ᯝࢆ♧ࡍ㸬CASE1-1 ࡜ CASE1-2 ࡢ㸦E㸧໙㓄 rࡢࢣ࣮ࢫ฿㐩㊥㞳ࡣྠ⛬ᗘ࡛࠶ࡿ୍᪉࡛㸪CASE1-3 ࡢྑᓊ࡜ᕥᓊࡢ฿㐩㊥㞳ࡣ␗࡞ࡿ⤖ᯝ࡜࡞ࡾ㸪ྑᓊࡢ฿㐩㊥CASE

฿㐩㊥㞳
㹙cm㹛

ሁ✚ᖜ
㹙cm㹛

ሁ✚ཌ
㹙cm㹛

2-1

36.8

᭱኱ W㸸18.7
ᖹᆒwഥ㸸15.5

᭱኱ D㸸1.0
ᖹᆒ ഥd㸸0.6

2-2

ྑᓊ㸸42.4ᕥᓊ㸸40.3

᭱኱ W㸸17.8
ᖹᆒwഥ㸸13.0᭱኱ D㸸1.2
ᖹᆒ ഥd㸸0.6

2-3

ྑᓊ㸸38.1
ᕥᓊ㸸37.7

᭱኱ W㸸19.4
ᖹᆒwഥ㸸13.0᭱኱ D㸸0.9
ᖹᆒ ഥd㸸0.6

㞳ࡣ CASE1-1 ࡜ CASE1-2 ࢆୖᅇࡿ⤖ᯝ࡜࡞ࡗࡓ㸬ࡇࡢࡼ࠺࡞⤖ᯝ࡜࡞ࡗࡓཎᅉ࡜ࡋ࡚㸪ึᮇᗘࡢ㐪࠸ࡀᙳ㡪ࢆཬࡰࡍྍ⬟ᛶࡶ⪃࠼ࡽࢀࡿࡀ㸪࠸ࡲࡔ୙᫂░࡛࠶ࡾ㸪௒ᚋࡢㄢ㢟࡛࠶ࡿ㸬ྛࢣ࣮ࢫࡢሁ✚ཌࡣ㸪ᵓ㐀≀ᤕᤊ㠃࡛᭱኱࡜࡞ࡗࡓ㸬㸬ὶື୰ࡢ⁐ᒾ࡟㛵ࡍࡿ⪃ᐹ

4.0
3.5

⢓ᛶಀᩘࡣᗘࡢ㛵ᩘ࡛࠶ࡿࡓࡵ㸪⁐ᒾὶࡢᗘ࡜⢓ᛶಀᩘ࡟ࡘ࠸࡚ࡢ㆟ㄽࡣ㔜せ࡛࠶ࡿ㸬௒ᚋ㸪ᐇ⌧㇟࡜ࡢẚ㍑ࡸᩘ್ゎᯒ࡟ࡼࡿ᳨ウࢆ⾜࠺ୖ࡛ࡶ㸪ᐇ[log Pa s]⁐ᒾὶࡢὶືࢆつᐃࡍࡿࣃ࣓࣮ࣛࢱࡢ 1 ࡘ࡛࠶ࡿ㦂࡛⏝࠸ࡓ⁐ᒾࡢ⢓ᛶಀᩘࡢホ౯ࡣ㔜せ࡜࡞ࡿ㸬ᮏࡅࡢ⢓ᛶಀᩘ࡛࠶ࡾ㸪ᗘኚ໬ࡸὶ㏿ࡢῶᑡࡀ⟬ฟ

CASE1-1㸦10r㸪↓᪋タ㸧
CASE1-2㸦10r㸪b=5cm㸧

2.0

CASE1-3㸦10r㸪b=10cm㸧⢓ᛶಀᩘࡿ㸬ࡇࡢ⢓ᛶಀᩘࡣ㸪ᐇ㦂⤖ᯝ࠿ࡽ㏫⟬ࡉࢀࡿぢ࠿

2.5

1.5◊✲࡛⏕ᡂࡋࡓ⁐ᒾࡣ㸪⼥Ⅼ㝆ୗ๣ࢆຍ࠼࡚⏕ᡂࡋ࡚࠾ࡾ㸪୍⯡ⓗ࡞⁐ᒾ࡜ࡣ≉ᛶࡀ␗࡞ࡿ࡜⪃࠼ࡽࢀ

3.0್࡟኱ࡁ࡞ᙳ㡪ࢆཬࡰࡍ࡜⪃࠼ࡽࢀࡿ㸬ᮏ◊✲ࡢࡼ

CASE2-2㸦15r㸪b=5cm㸧

1.0

CASE2-3㸦15r㸪b=10cm㸧

0.5

Soldati et al.(2020)

0.0-0.5࠺࡟ᑠつᶍ࡞ᐇ㦂࡛ࡣ㸪ᵓ㐀≀ᤕᤊᚋ㸪ᕥྑ࡟ศ࠿

CASE2-1㸦15r㸪↓᪋タ㸧

0.0

2.0

4.0

6.0

8.0

10.0

12.0

14.0-1.0ࢀࡓᚋࡢࡑࢀࡒࢀࡢ⁐ᒾὶࡢ࣮࣒࣎ࣜࣗࡣᑠࡉࡃ࡞

ᗘ (10000/T [K])ᅗ ⢓ᛶಀᩘ࡜ὶୗࣇࣟࣥࢺ㒊 ᗘ࡜ࡢ㛵ಀࡿࡓࡵ㸪ศ࠿ࢀࡿ๓࡜ኚࢃࡽࡎ⤫୍ⓗ࡞ホ౯ࡀྍ⬟࡛࠶ࡿ࠿୙࡛᫂࠶ࡿ㸬ᮏ◊✲࡛ࡣ㸪ⴭ⪅ࡽࡢᐇ㦂࡟ࡢⓎ㐩ࡋ࡚࠸࡞࠸⁐ᒾὶࡢᖹᆒὶ㏿v࡜⢓ᛶಀᩘμࡢ࠾ࡅࡿ⢓ᛶಀᩘࢆホ౯ࡍࡿࡓࡵ㸪ࢫࢣ࣮ࣝࡢ␗࡞ࡿ

㛵ಀࡣᘧ㸦1㸧ࡢࡼ࠺࡟♧ࡉࢀ࡚࠸ࡿ 8)㸬

ᐇ㦂࡜ࡋ࡚ 10,000cm3 ⛬ᗘࡲ࡛ࡢつᶍࡢᐇ㦂ࢆ⾜ࡗv = ρgh2 sin θ / 3μ㸦1㸧

ࡓ Soldati et al. ࡢ⤖ᯝ࡜ẚ㍑ࡋࡓ㸬ࡲࡓ㸪ᮏᐇ㦂ࢫࡇࡇ࡟㸪v㸸ὶୗ㏿ᗘ㸪ρ㸸⁐ᒾࡢᐦᗘ㸪㸸㔜ຊຍ㏿ࢣ࣮࡛ࣝ⤫୍ⓗ࡞ホ౯ࡢྍྰࢆᢕᥱࡍࡿࡓࡵ㸪ྛࢣᗘ㸪θ㸸ὶ㊰໙㓄㸪h㸸ὶື῝㸪μ㸸⢓ᛶಀᩘ࡛࠶ࡿ㸬࣮ࢫࡢ⢓ᛶಀᩘ࡜ὶୗ㏿ᗘࡣ㸪ὶୗ㊥㞳ࡢ᫬⣔ิኚ໬࠿ࡽ⟬ฟࡋࡓ㸬2)ᗘ࡜ࡢ㛵ಀࢆᩚ⌮ࡋࡓ㸬⁐ᒾὶࡢὶ㏿ࡣ㸪ὶୗ㊥㞳ࡢ᫬⣔ิኚ໬࠿ࡽồࡵὶື῝ࡣ㸪ྑᓊഃ᪉࠿ࡽ᧜ᙳࡋࡓື⏬࠿ࡽุㄞࡋࡓࡿࡓࡵ㸪ὶୗࣇࣟࣥࢺ㒊࡟╔┠ࡍࡿ㸬ὶୗࣇࣟࣥࢺ

್ࢆᘧ㸦1㸧࡟௦ධࡋࡓ㸬ഃ᪉࠿ࡽ᧜ᙳࡋࡓື⏬࠿ࡽ㒊⤖ᯝࢆ㸪ุㄞྍ⬟࡞ὶື῝ࡣ㸪ᵓ㐀≀ࡢྑᓊ࡟ὶฟࡍࡿ⁐ᒾ⇕ゎᯒࢯࣇࢺ࢙࢘࢔㸦FLIR Tools+㸧࡛ゎᯒࡋ࡚ồࡵὶࡢࡳ࡛࠶ࡿࡓࡵ㸪ᮏ◊✲࡛ࡣ㸪ᵓ㐀≀ࡢྑᓊ࡟ὶࡓ㸬ὶୗࣇࣟࣥࢺ㒊ࡢᢳฟ⠊ᅖ㸦5×5 ⏬⣲㸧࡟᭱኱ฟࡋࡓ⁐ᒾὶࣇࣟࣥࢺ㒊ࡢ⢓ᛶಀᩘࢆ᥎ᐃࡋࡓ㸬ᗘࡣ㸪㉥እ⥺ࢧ࣮ࣔࢢࣛࣇ࢕࡟ࡼࡿィᗘࢆὶୗࣇࣟࣥࢺ㒊ᗘ࡜ࡋࡓ㸬

Soldati et al.ࡣ㸪ᙼࡽࡢᐇ㦂࡛⏝࠸ࡓ⁐ᒾࡢ⢓ᛶಀᩘᮏ◊✲࡛Ⓨ⏕ࡉࡏࡓ⁐ᒾὶࡣᑠつᶍ࡛࠶ࡿࡓࡵ㸪ࣉࣛࢢᒙࡣⓎ㐩ࡋ࡚࠸࡞࠸࡜⪃࠼ࡽࢀࡿ㸬ࣉࣛࢢᒙ࡟ࡘ࠸࡚㸪ὶୗࣇࣟࣥࢺ㒊ᗘTf ࡢ㏫ᩘ࡜ᑐᩘࢆ࡜ࡗࡓ⢓ᛶಀᩘμ࡜ࡢ㛵ಀ࡛ᩚ⌮ࡋ࡚࠾ࡾ㸪ᮏ◊✲࡛ࡶ― 164 ―⁐ᒾࡢ⢓ᛶಀᩘࡣ㸪Soldati et al.ࡀᐇ㦂࡛⏝࠸ࡓ⁐ᒾࡢ⢓ᛶಀᩘ࡜ẚ㍑ࡋ࡚ࡶᑠࡉ࠸ࡇ࡜ࡀศ࠿ࡿࡀ㸪ⴭ⪅ࡽࡢᐇ㦂ࢣ࣮ࢫ㛫࡛ࡣ CASE2-2 ࢆ㝖ࡁ㸪⤫୍ⓗ࡞ഴྥࢆ♧ࡍࡼ࠺࡛࠶ࡿ㸬୍⯡࡟㸪⁐ᒾὶࡣ෭༷ࡢ㐍⾜࡟క࠸ὶືᛶࡀపୗࡍࡿࡇ࡜ࡀ▱ࡽࢀ࡚࠾ࡾ㸪ⴭ⪅ࡽࡢ⁐ᒾ࡟ࡘ࠸࡚ࡶ㸪CASE2-2 ࢆ㝖࠸࡚ྠᵝࡢഴྥ࡟࠶ࡿ㸬CASE2-2 ࡣ㸪ẼἻࡢⓎ⏕ࡀ㢧ⴭ࡛࠶ࡗࡓ㸬༊㛫య✚ࡢ⣼ຍⓒศ⋡㹙%㹛

ᙼࡽ࡟࡞ࡽࡗ࡚ᩚ⌮ࡋࡓ㸦ᅗ㸧㸬ᮏᐇ㦂࡛⏕ᡂࡋࡓࡍ࡞ࢃࡕ㸪ẼἻࡀ㢧ⴭ࡞ࢣ࣮ࢫ࡛ࡣ㸪⢓ᛶಀᩘࡢホ

60
40

20
CASE1-3>ྑᓊ@ᤕᤊ㠃0.5400.20.40.6
฿㐩㊥㞳ẚ

CASE1-1
CASE1-2_ྑᓊ
CASE1-3_୧ᓊ
CASE1-3_ྑᓊ

2.5ᐇ㦂ࢫࢣ࣮ࣝ⛬ᗘ࡛࠶ࡗ࡚ࡶ㸪ᵓ㐀≀࡟ࡼࡿᕥྑ࡬

2.0ሁ✚ᖜẚࡢศ㞳ࡀὶື࡟୚࠼ࡿᙳ㡪ࡣᑠࡉ࠸࡜⪃࠼ࡽࢀࡿ㸬㸦㸧⪃ᐹ࡛⏝࠸ࡿㅖ㔞࡟ࡘ࠸࡚

1.0

CASE1-3>ྑᓊ@ᤕᤊ㠃0.540.0ᖹᆒ᩿㠃ἲ࡟ࡼࡾ༊㛫య✚ࢆ⟬ฟࡋࡓ㸬ᮏ◊✲࡟࠾

0.00.20.40.6฿㐩㊥㞳ẚࡅࡿᐇ㦂⤖ᯝࡣ㸪ྛࢣ࣮ࢫ࡛฿㐩㊥㞳㸪ሁ✚ᖜ࠾ࡼ2.5࠸㸬ࡇࡢࡓࡵ㸪฿㐩㊥㞳ẚ㸪ሁ✚ᖜẚ࠾ࡼࡧሁ✚ཌẚࡢẚࢆ⏝࠸ࡿࡇ࡜࡛ྛ CASE ࡢᐇ㦂⤖ᯝࢆつ᱁໬NW = w / w
ഥത
ND = d / d㸦3㸧ࡇࡇ࡟㸪l㸸౪⤥ᆅⅬ࠿ࡽィᆅⅬࡲ࡛ࡢ㊥㞳㸪㸸฿

CASE1-1
CASE1-2_ྑᓊ
CASE1-3_୧ᓊ
CASE1-3_ྑᓊ

2.0
ሁ✚ཌẚ

㸦2㸧

CASE1-2
CASE1-3>ᕥᓊ@ᤕᤊ㠃0.690.81.0ᅗ ሁ✚ᖜẚ࡜฿㐩㊥㞳ẚࡢ㛵ಀࡧሁ✚ཌ➼ࡀ␗࡞ࡿ⤖ᯝ࡜࡞ࡾ㸪༢⣧ẚ㍑ࡀ࡛ࡁ࡞

NL = l / L

1.0

CASE1-2_ᕥᓊ
CASE1-2_୧ᓊ
CASE1-3_ᕥᓊ

0.5ࢀࡒࢀᘧ㸦2㸧㸪㸦3㸧㸪㸦4㸧࡛⾲ࡉࢀࡿ㸬

0.81.5ࡋࡓሁ✚ᖜ࡜ሁ✚ཌࢆ⏝࠸࡚㸪ࡋẚ㍑ࡋࡓ㸬฿㐩㊥㞳ẚ㸪ሁ✚ᖜẚ㸪ሁ✚ཌẚࡣࡑ

CASE1-2
CASE1-3>ᕥᓊ@ᤕᤊ㠃0.69ᅗ ༊㛫య✚ࡢ⣼ຍⓒศ⋡࡜฿㐩㊥㞳ẚࡢ㛵ಀ࡟ࡼࡿഴྥࡢኚ໬ࡣぢࡽࢀ࡞࠿ࡗࡓ㸬ࡇࡢࡓࡵ㸪ᮏᮏ◊✲࡛ࡣ㸪ィ

800.0౯࡟ὀពࡀᚲせ࡜⪃࠼ࡽࢀࡿ㸬ࡲࡓ㸪ᵓ㐀≀ࡢ᭷↓㸬ሁ✚⤖ᯝ࡟㛵ࡍࡿ⪃ᐹ

CASE1-1
CASE1-2_ᕥᓊ
CASE1-2_ྑᓊ
CASE1-2_୧ᓊ
CASE1-3_୧ᓊ
CASE1-3_ᕥᓊ
CASE1-3_ྑᓊ

100

CASE1-2_ᕥᓊ
CASE1-2_୧ᓊ
CASE1-3_ᕥᓊ

1.5
1.00.5

㸦4㸧

CASE1-3>ྑᓊ@ᤕᤊ㠃0.540.00.0㐩㊥㞳㸪w㸸౪⤥ᆅⅬ࠿ࡽ l 㞳ࢀࡓᆅⅬ࡛ࡢሁ✚ᖜ㸪

0.2

0.40.6฿㐩㊥㞳ẚ

CASE1-2
CASE1-3>ᕥᓊ@ᤕᤊ㠃0.690.81.0ᅗ ሁ✚ཌẚ࡜฿㐩㊥㞳ẚࡢ㛵ಀ‫ݓ‬ഥ㸸ᖹᆒሁ✚ᖜ㸪 d㸸౪⤥ᆅⅬ࠿ࡽ l 㞳ࢀࡓᆅⅬ࡛ࡢሁ✚ཌ㸪ത 㸸ᖹᆒሁ✚ཌ㸪฿㐩㊥㞳ẚ 0.0 ࡜ 1.0 ࡣࡑࡓഴྥࢆ♧ࡍ㸦ᅗ㸧㸬ࡇࡢࡓࡵ㸪ὶ㊰໙㓄ࡀ 10rࡢࢀࡒࢀ㸪౪⤥ᆅⅬ࡜⁐ᒾࣇࣟࣥࢺ㒊ࢆ♧ࡍ㸬ࢣ࣮ࢫ࡛ࡣ㸪༊㛫య✚ࡢ⣼ຍⓒศ⋡ࡢቑຍഴྥࡣ㸪ሁ✚ᖜ࠶ࡿ࠸ࡣሁ✚ཌ࡝ࡕࡽ࠿∦᪉ࡢഴྥࡢࡳ࡟ᕥ ᶓ᩿ᵓ㐀≀ࡢୖὶ࡟ሁ✚ࡋࡓ⁐ᒾὶྑࡉࢀࡿࢃࡅ࡛ࡣ࡞࠸ࡇ࡜ࡀศ࠿ࡿ㸬ᅗ ࠾ࡼࡧᅗ ࡟㸪༊㛫య✚ࡢ⣼ຍⓒศ⋡࡜㸪฿Ọ㔝ࡽ 7)ࡣ CASE2-1㸪CASE2-2 ࡟ࡘ࠸࡚ሁ✚ᖜࡀ㐩㊥㞳ẚࡢ㛵ಀࢆ♧ࡍ㸬ࡲࡓ㸪฿㐩㊥㞳ẚ࡟ᑐࡍࡿయ✚࡟ᑐࡋ࡚ᙳ㡪ࡀ኱ࡁ࠸ࡇ࡜ࢆ♧၀ࡋࡓ㸬ࡇࢀࡣ㸪ሁ✚ᖜẚࢆᅗ ࡜ᅗ ࡟㸪฿㐩㊥㞳ẚ࡟ᑐࡍࡿሁ✚CASE2-1 ࡜ CASE2-2 ࡢ༊㛫య✚ࡀ୍ᐃࡢ๭ྜ࡛ቑཌẚࢆᅗ ࡜ᅗ ࡟ࡑࢀࡒࢀ♧ࡍ㸬ຍࡍࡿ୍᪉࡛㸪ሁ✚ཌẚࡀ␗࡞ࡿഴྥࢆ♧ࡍࡢ࡟ᑐᅗ ࡟♧ࡍࡼ࠺࡟㸪CASE1-1 ࡢ༊㛫య✚ࡢ⣼ຍⓒࡋ㸪ሁ✚ᖜẚࡀ㢮ఝࡋࡓഴྥࢆ♧ࡍࡓࡵ࡛࠶ࡿ㸬ศ⋡ࡣ㸪฿㐩㊥㞳ࡢቑຍ࡟క࠸୍ᐃࡢ๭ྜ࡛ቑຍࡋCASE2-3 ࡢ༊㛫య✚ࡢ⣼ຍⓒศ⋡ࡣ㸪฿㐩㊥㞳ࡢቑ࡚࠸ࡿ㸬୍᪉࡛㸪౪⤥ᆅⅬ࠿ࡽᵓ㐀≀ᤕᤊ㠃ࡲ࡛ࡢຍ࡟క࠸㸪୍ᐃࡢ๭ྜ࡛ቑຍࡋ࡚࠸ࡿ㸦ᅗ㸧㸬౪⤥

CASE1-2 ࠾ࡼࡧ CASE1-3 ࡢ༊㛫య✚ࡢ⣼ຍⓒศ⋡ᆅⅬ࠿ࡽᵓ㐀≀ᤕᤊ㠃ࡲ࡛ࡢ༊㛫࡟࠾࠸࡚㸪CASE2-ࡣ㸪⦆ࡸ࠿࡞ࡀࡽࡶቑຍഴྥ࡟࠶ࡿ㸬 CASE1-3 ࡟࠾3 ࡢሁ✚ᖜࡣ CASE2-1㸪CASE2-2 ࡜㢮ఝࡋࡓഴྥࢆ

࠸࡚ࡶ㸪౪⤥ᆅⅬ࠿ࡽᵓ㐀≀ᤕᤊ㠃ࡲ࡛ࡢ༊㛫࡛㸪♧ࡋ㸦ᅗ㸧㸪ሁ✚ཌࡣ CASE2-2 ࡜㢮ఝࡋࡓഴྥࢆ

ሁ✚ᖜࡣ CASE1-1 ࡜㢮ఝࡋࡓഴྥࢆ♧ࡍ㸦ᅗ㸧ࡀ㸪♧ࡍ㸦ᅗ㸧㸬ࡇࡢࡓࡵ㸪ὶ㊰໙㓄ࡀ 15rࡢࢣ࣮ࢫሁ✚ཌࡣᤕᤊ㠃࡟࠿ࡅ࡚ቑຍࡋ㸪CASE1-2 ࡜㢮ఝࡋ࡛ࡣ㸪౪⤥ᆅⅬ࠿ࡽᵓ㐀≀ᤕᤊ㠃ࡲ࡛ࡢ༊㛫࡛ࡣ⁐― 165 ― ᶓ᩿ᵓ㐀≀ࡢୗὶ࡟ὶฟࡋࡓ⁐ᒾὶᅗ ࡟♧ࡍࡼ࠺࡟㸪CASE1-2 ࡜ CASE1-3 ࡟࠾ࡅࡿᵓ㐀≀ᤕᤊ㠃௨㝆ࡢ༊㛫య✚ࡣ㸪୍ᐃࡢ๭ྜ࡛ቑຍࡋ࡚࠸ࡿ㸬Ọ㔝ࡽ 7)ࡣ㸪CASE1-2 ࡜ CASE2-2 ࡟࠾ࡅࡿᵓ㐀≀ࢆ㎽ᅇࡋࡓ⁐ᒾࡢሁ✚ᖜ㸪ሁ✚ཌࡣ㸪ࡑࢀࡒࢀ୍ᐃࡢ್ࢆྲྀࡿ༊㛫ࡀฟ⌧ࡍࡿഴྥࡀ࠶ࡿࡇ

100༊㛫య✚ࡢ⣼ຍⓒศ⋡㹙%㹛

ᒾࡢయ✚࡟ࡣሁ✚ᖜࡢᙳ㡪ࡀ኱ࡁ࠸࡜⪃࠼ࡽࢀࡿ㸬࡜ࢆ♧၀ࡋࡓ㸬ᵓ㐀≀ᤕᤊ㠃௨㝆࡟ࡘ࠸࡚㸪CASE1-8060

CASE2-1
CASE2-2_ᕥᓊ
CASE2-2_ྑᓊ
CASE2-2_୧ᓊ
CASE2-3_୧ᓊ
CASE2-3_ᕥᓊ
CASE2-3_ྑᓊ4020

CASE2-2ᤕᤊ㠃0.48

00.00.2

CASE2-3ᤕᤊ㠃0.53

0.40.6
฿㐩㊥㞳ẚ

0.8

1.0

3㸪CASE2-3 ࡛ࡢሁ✚ᖜࡶྠᵝ࡛࠶ࡾ㸦ᅗ㸪ᅗ㸧㸪ᅗ ༊㛫య✚ࡢ⣼ຍⓒศ⋡࡜฿㐩㊥㞳ẚࡢ㛵ಀࡇࢀࡣ㸪⯉≧࡟ศ࠿ࢀࡓᚋࡢᖜࡀ୍ᵝ࡟㏆࠸ࡇ࡜ࢆ

2.5

CASE2-1
CASE2-2_ྑᓊ
CASE2-3_୧ᓊ
CASE2-3_ྑᓊព࿡ࡍࡿ㸬CASE1-3㸪CASE2-3 ࡛ࡢሁ✚ཌ࡟ࡘ࠸࡚
2.0ࢃ࠿ࡿ㸦ᅗ㸪ᅗ㸧㸬ࡇࡢࡓࡵ㸪ᵓ㐀≀࡟ᤕᤊࡉࢀࡓ⁐ᒾࡢሁ✚ᖜ࠾ࡼࡧሁ✚ཌࡣ㸪タ⨨ࡋࡓᵓ㐀≀ࡢᖜ㸪໙㓄࡟ࡼࡽࡎ୍ᐃࡢ್ࢆ♧ࡍ࡜⪃࠼ࡽࢀࡿ㸬ሁ✚ᖜẚࡶ㸪ศ࠿ࢀࡓᚋࡢཌࡉࡀ୍ᵝ࡞≉ᚩࢆ᭷ࡍࡿࡇ࡜ࡀ

1.5

1.00.5㸬࠾ࢃࡾ࡟

CASE2-2ᤕᤊ㠃0.480.00.0ᮏ◊✲࡛ࡣ㸪┤᪉యࡢᵓ㐀≀ࢆタ⨨ࡋࡓᖹᯈὶ㊰࡟ᤕᤊࡉࢀୗὶ࡟ὶฟࡋࡓሙྜ㸪ሁ✚ᖜ㸪ሁ✚ཌ࡜

2.0ሁ✚ཌẚ౪⤥㔞ࢆቑຍࡉࡏࡓὶືᐇ㦂ࡸᵓ㐀ᙧ≧ࢆኚ໬ࡉࡏࡓᵓ㐀≀ࢆ⏝࠸ࡓὶືᐇ㦂ࢆ⾜࠸㸪ᮏ◊✲࡛♧ࡋࡓ

1.5

0.5

CASE2-2ᤕᤊ㠃0.480.0ᗘࡢ0.0㐪࠸ࡀ⤖ᯝ࡟୚࠼ࡿᙳ㡪࡟ࡘ࠸᳨࡚ウࡋࡓᚋ㸪ຠᯝ5)

0.8

1.0

Ọ㔝༤அ㸪ụᮏᩔဢ㸪ᰗཎ㥴ኴ㸪すᑿ㝧௓㸪బ⸨ᩄ᫂㸸ࡍࡿ◊✲㸪௧࿴ 3 ᖺᗘ◁㜵Ꮫ఍◊✲Ⓨ⾲఍ᴫせ㞟㸪㔝ᮧ࿴Ⰻ㸪⮻ᯂఙᾈ㸸⁐ᒾὶᑐ⟇᪋タࡢ᳨ウ஦౛࡟ࡘ

pp.69-70㸪2021㸬
6)ụᮏᩔဢ㸪Ọ㔝༤அ㸪ᰗཎ㥴ኴ㸪すᑿ㝧௓㸪బ⸨ᩄ᫂㸸◊✲Ⓨ⾲఍ᴫせ㞟㸪pp.382-383㸪2012㸬⁐ᒾὶࡢὶୗ≧ἣ࡜ሁ✚≉ᛶ࡟㛵ࡍࡿᐇ㦂ⓗ◊✲㸪➨

Soldati, A., Farrell, J.A., Sant, C., Wysocki, R., Karson,48 ᅇᅵᮌᏛ఍㛵ᮾᨭ㒊ᢏ⾡◊✲Ⓨ⾲఍ㅮ₇ᴫせ㸪Ⅱ-J.A.: The effect of bubbles on the rheology of basaltic lava

45㸪2021㸬

flows: Insights from large-scale two-phase experiments,7)Ọ㔝༤அ㸪ụᮏᩔဢ㸪ᰗཎ㥴ኴ㸪すᑿ㝧௓㸪బ⸨ᩄ᫂㸸

Earth and Planetary Science Letters, Vol.548, 2020.

┤᪉యᵓ㐀≀ࢆ㎽ᅇࡍࡿ⁐ᒾὶࡢሁ✚≉ᛶ࡟㛵ࡍࡿỈᒣ㧗ஂ㸪ᰩཎ῟୍㸪Ἑᮧ࿴ኵ㸪໭ཎ୍ᖹ㸸⁐ᒾὶࡢᐇ㦂ⓗ◊✲㸪௧࿴ 4 ᖺᗘ◁㜵Ꮫ఍◊✲Ⓨ⾲఍ᴫせ㞟㸪ࢩ࣑࣮ࣗࣞࢩࣙࣥ࡜ᑐ⟇ᡭἲ㸪᪂◁㜵㸪Vol.42㸪No.4㸪

pp.119-120㸪2022㸬8)

pp.12-17㸪1989㸬4)

0.40.6฿㐩㊥㞳ẚᰩཎᓫ᫭㸪㔠⃝኱௓㸪బ⸨ཌឿ㸪Ⲩ஭೺୍㸪ᓊᮏ༤ᚿ㸪࠸࡚ 㹼ఀ㇋኱ᓥࢆ౛࡜ࡋ࡚㹼㸪ᖹᡂ 24 ᖺᗘ◁㜵Ꮫ఍3)

0.2

CASE2-3ᤕᤊ㠃0.53┤᪉యᵓ㐀≀ࢆ㎽ᅇ࣭㉺ὶࡍࡿ⁐ᒾὶࡢሁ✚ᙧ≧࡟㛵ཧ⪃ᩥ⊩2)

1.0ᅗ ሁ✚ཌẚ࡜฿㐩㊥㞳ẚࡢ㛵ಀⓗ࡞ᑐ⟇᪋タࡢ㓄⨨ᙧែࢆホ౯ࡍࡿᚲせࡀ࠶ࡿ㸬1)

0.8

1.0

ഴྥ࡜ẚ㍑ࡋ࡚㸪⁐ᒾὶࡢὶື࣭ሁ✚≉ᛶࢆᩚ⌮ࡍࡿᚲせࡀ࠶ࡿ㸬ࡲࡓ㸪ᩘ್ゎᯒ࡟ࡼࡾ㸪ึᮇ

0.40.6฿㐩㊥㞳ẚ

CASE2-1
CASE2-2_ᕥᓊ
CASE2-2_ྑᓊ
CASE2-2_୧ᓊ
CASE2-3_୧ᓊ
CASE2-3_ᕥᓊ
CASE2-3_ྑᓊ

2.5ᐹ㸪ὶື࣭ሁ✚≉ᛶ࡟㛵ࡍࡿ⪃ᐹࢆヨࡳࡓ㸬ᵓ㐀≀⯉≧࡟ศ࠿ࢀࡓ≉ᚩ࡜⪃࠼ࡽࢀࡓ㸬௒ᚋࡣ㸪⁐ᒾࡢ

0.2

CASE2-3ᤕᤊ㠃0.53ᅗ ሁ✚ᖜẚ࡜฿㐩㊥㞳ẚࡢ㛵ಀࢆ⏝࠸࡚⁐ᒾὶࡢὶືᐇ㦂ࢆᐇ᪋ࡋ㸪ὶື≧ἣࡢほࡶ࡟୍ᐃࡢ್ࢆྲྀࡿ༊㛫ࡀฟ⌧ࡍࡿഴྥࡀࡳࡽࢀ㸪

CASE2-2_ᕥᓊ
CASE2-2_୧ᓊ
CASE2-3_ᕥᓊ◁㜵࣭ᆅࡍ࡭ࡾᢏ⾡ࢭࣥࢱ࣮㸸◁㜵ᩘ್ࢩ࣑࣮ࣗࣞࢩỌ㔝༤அ㸪ᰗཎ㥴ኴ㸪బ⸨ᩄ᫂㸪すᑿ㝧௓㸸ᑠᆺὶ㊰ࣙࣥ࡟࠾ࡅࡿࣔࢹࣝࡢ≉ᛶ࡟㛵ࡍࡿ◊✲㸪◊✲ሗ࿌㸪ࢆ⏝࠸ࡓ⁐ᒾὶࡢὶື≉ᛶホ౯࡟㛵ࡍࡿᐇ㦂ⓗ◊✲㸪➨ 1 ྕ㸪pp.94-110㸪2000㸬௧࿴ඖᖺᗘ◁㜵Ꮫ఍◊✲Ⓨ⾲఍ᴫせ㞟㸪pp.67-68㸪2019㸬― 166 ―   㸦ཷ௜㸧