➨ᅇᅵ◁⅏ᐖ࡟㛵ࡍࡿࢩ࣏ࣥࢪ࣒࢘ㄽᩥ㞟㸪ᖺ᭶ ᖺ⣖ఀ༙ᓥ኱Ỉᐖ࡛Ⓨ⏕ࡋࡓ㛗Ẋᆅ༊࡜ᰩᖹᆅ༊ࡢ  ࡘࡢኳ↛ࢲ࣒ࡢỈᩥ≉ᛶࡢ㐪࠸࡜㉺ὶࡋࡸࡍࡉࡢ㛵ಀCAUSED BY THE 2011 KII PENINSULA DISASTER OF TWO LANDSLIDEDAMS IN THE NAGATONO AND KURIDAIRA AREA RELATIONSHIPBETWEEN DIFFERENCE OF HYDROLOGICAL CHARACTERISTICS AND THE
EASE OF OVERFLOW
ྈ⇃඾Ꮚ ࣭ᾏཎⲮ୍ ࣭ᮌୗ⠜ᙪ ࣭ྂỤᬛ༤ ࣭໭ᮏᴦ ࣭ᑠᮡᜨ ࣭ᒣ㉺㝯㞝
Noriko TADAKUMA, Soichi KAIHARA, Atsuhiko KINOSHITA, Tomohiro FURUE,Gaku KITAMOTO, Megumi KOSUGI and Takao YAMAKOSHIᰴᘧ఍♫࢚࢖ࢺ᪥ᮏᢏ⾡㛤Ⓨ㸦ࠛᒸᒣ┴ᒸᒣᕷ໭༊ὠᓥி⏫㸧ᰴᘧ఍♫࢚࢖ࢺ᪥ᮏᢏ⾡㛤Ⓨ㸦ࠛᒸᒣ┴ᒸᒣᕷ໭༊ὠᓥி⏫㸧ᅜᅵ஺㏻┬ᅜᅵᢏ⾡ᨻ⟇⥲ྜ◊✲ᡤ㸦㏆␥ᆅ᪉ᩚഛᒁ኱つᶍᅵ◁⅏ᐖᑐ⟇ᢏ⾡ࢭࣥࢱ࣮㸧㸦ࠛ࿴ḷᒣ┴ᮾ∹፝㒆㑣ᬛ຾ᾆ⏫ᕷ㔝ࠎ㸧

ᅜᅵ஺㏻┬㏆␥ᆅ᪉ᩚഛᒁ⣖ఀᒣ⣔◁㜵஦ົᡤ㸦ࠛዉⰋ┴஬ᲄᕷ୕ᅾ⏫㸧

ᅜᅵ஺㏻┬㏆␥ᆅ᪉ᩚഛᒁ኱つᶍᅵ◁⅏ᐖᑐ⟇ᢏ⾡ࢭࣥࢱ࣮㸦ࠛ࿴ḷᒣ┴ᮾ∹፝㒆㑣ᬛ຾ᾆ⏫ᕷ㔝ࠎ㸧

ᅜᅵ஺㏻┬㏆␥ᆅ᪉ᩚഛᒁ⣖ఀᒣ⣔◁㜵஦ົᡤ㸦ࠛዉⰋ┴஬ᲄᕷ୕ᅾ⏫㸧

ᅜᅵ஺㏻┬ᅜᅵᢏ⾡ᨻ⟇⥲ྜ◊✲ᡤ㸦ࠛⲈᇛ┴ࡘࡃࡤᕷ᪫㸧

Key Words : landslide dam, Hydrological characteristics, meteorological characteristics, Permeabilitycharacteristics㸬 ࡣࡌࡵ࡟ ῝ᒙᔂቯ࡞࡝࡟క࠺ኳ↛ࢲ࣒ࡢ㉺ὶ౵㣗ࡣ‣ỈụࡢỈࡀ୍Ẽ࡟ὶୗࡍࡿࡓࡵ㸪ୗὶ࡟⏒኱࡞⿕ᐖࢆཬࡰࡍ㸬2011ᖺࡢ⣖ఀ༙ᓥ኱Ỉᐖ࡛ࡣ㸪ᗈ⠊ᅖ࡛㐃⥆㞵㔞ࡀ
1000mmࢆ㉸࠼ࡿࡼ࠺࡞グ㘓ⓗ኱㞵1)࡜࡞ࡾ㸪72⟠ᡤࡢ῝ᒙᔂቯࡀⓎ⏕ࡋ㸪17⟠ᡤࡢኳ↛ࢲ࣒ࡀⓎ⏕ࡋࡓ2)㹼4).ࡑࢀࡽࡢኳ↛ࢲ࣒ࡢࡑࡢᚋࡢ≧ἣࡣᵝࠎ࡛㸪2ᅇ࡯࡝㸪࠶࡜ᩘm࡛‶Ỉ࡟࡞ࡿỈ఩ࡲ࡛ୖ᪼ࡣࡋࡓࡶࡢࡢ㸪ࡇࡢ⣙10ᖺ࡛‶Ỉ࡟࡞ࡗ࡚࠸࡞࠸㛗Ẋᆅ༊ࡢኳ↛ࢲ࣒ࡢࡼ࠺࡞ࡶࡢࡶ࠶ࡿ㸬ࡋ࠿ࡋ㸪୍᪉࡛ఱᗘࡶ㉺ὶ౵㣗ࢆ⧞ࡾ㏉ࡋ࡚࠸ࡿᰩᖹᆅ༊ࡢࡼ࠺࡞ኳ↛ࢲ࣒ࡶ࠶ࡿ5),6)㸬
Costa and Schuster 7)ࡢㄪᰝ࡟ࡼࡿ࡜ኳ↛ࢲ࣒ࡢỴቯ஦౛ࡢ࡯࡜ࢇ࡝ࡣ㉺ὶ౵㣗࡟ࡼࡿࡶࡢ࡛㸪⣖ఀ༙ᓥ኱Ỉᐖ௨እࡢ㏆ᖺᅜෆ࡛Ⓨ⏕ࡋࡓኳ↛ࢲ࣒࡛ࡶ㉺ὶ౵㣗ࡢሗ࿌ࡀ࠶ࡾ8),9)㸪Ỉᒣࡽ10)㸪⏣⏿ࡽ11)ࡢ㈨ᩱ࡟ࡼࡿ࡜᭷ྐ௨㝆ࡢኳ↛ࢲ࣒Ỵቯ஦౛ࡢ࠺ࡕከࡃࡣ㉺ὶࡀཎᅉ࡟࡞ࡗ࡚࠸ࡿࡶࡢࡀ♧ࡉࢀ࡚࠸ࡿ㸬ࡑࡢኳ↛ࢲ࣒ࡢᏳᐃᛶホ౯࡜ࡋ࡚ࡣ㸪ኳ↛ࢲ࣒ࡢᅵ◁㔞࡜༢఩㠃✚࠶ࡓࡾࡢ㞟Ỉ㠃✚࠿ࡽᏳ ᐃ ᗘ ࢆ ホ ౯ ࡍ ࡿ Casagli and Ermini ࡢ BI(BlockageIndex)12)ࡸࡑࡢᨵⰋ∧࡛࠶ࡿኳ↛ࢲ࣒ࡢ㧗ࡉࢆ⪃៖ࡋࡓ
Ermini and Casagli 13)ࡢDBI(Dimensionless Blockage Index)
ࡢ௚㸪Korup14)ࡣᏳᐃᗘࡢᣦᶆ࡜ࡋ࡚㸪ኳ↛ࢲ࣒ࡢ㧗ࡉ㸪‣Ỉụࡢᐜ㔞㸪༢఩㠃✚ᙜࡓࡾࡢ㞟Ỉ㠃✚㸪ୖὶࡢᕝࡢ㛗ࡉ➼࠿ࡽᏳᐃᗘࢆホ౯ࡍࡿᣦᶆࡀᥦ᱌ࡉࢀ࡚࠸ࡿ㸬ࡉ
ࡽ࡟Dong et al.15),16)ࡣ㸪ࣆ࣮ࢡὶධ㔞ࡸኳ↛ࢲ࣒ࡢ㧗ࡉ㸪༢఩㠃✚ᙜࡓࡾࡢ㞟Ỉ㠃✚㸪ኳ↛ࢲ࣒ࡢᖜ㸪ኳ↛ࢲ࣒ࡢὶୗ᪉ྥࡢ㛗ࡉ㸪ኳ↛ࢲ࣒ࡢయ✚➼࠿ࡽ㸪Ᏻᐃᗘࢆホ౯ࡋ࡚࠸ࡿ㸬ࡋ࠿ࡋ㸪ࡇࢀࡽࡣኳ↛ࢲ࣒࡬ࡢὶධ㔞(ὶᇦ࠿ࡽࡢὶฟ㔞)࡞࡝ࡢỈᩥᏛⓗせ⣲ࡀ⪃៖ࡉࢀ࡚࠸࡞࠸㸬௚᪉㸪༓ⴥ࣭Ỉᒣ17)ࡣ⣼ຍ㞵㔞࡜ᦆኻ㞵㔞ࡢ㛵ಀ࠿ࡽ㸪‶Ỉࡲ࡛ࡢ㞵㔞ࢆồࡵࡿ᪉ἲࢆ᳨ウࡋ࡚࠾ࡾ㸪ࡲࡓ㸪ᶓᒣࡽ18)ࡣୖὶࡢὶᇦ㠃✚ࡸኳ↛ࢲ࣒࡬ࡢὶධ㔞ࡢẚὶ㔞―7―࡟ຍ࠼㸪₃Ỉ㔞ࢆ⪃៖ࡋ࡚ኳ↛ࢲ࣒ࡢỴቯࡲ࡛ࡢ⥅⥆᫬㛫ࢆồࡵࡿ᪉ἲࢆᥦ᱌ࡋ࡚࠸ࡿ㸬ࡑࢀࡽࡢኳ↛ࢲ࣒ࡢᏳᐃᛶࡸ㉺ὶࡢ༴㝤ᛶࡢホ౯᪉ἲࡣ㸪Ỉᩥⓗせ⣲ࢆ࠶ࡿ⛬ᗘ⪃៖ࡋ࡚࠸ࡿࡶࡢࡢ㸪ኳ↛ࢲ࣒ᙧᡂ┤ᚋࡢᴟࡵ࡚ᑡ࡞
࠸ほ ㈨ᩱ࡟ᇶ࡙ࡃ኱ࡲ࠿࡞ண ᪉ἲ࡜ࡋ࡚ࡣ᭷⏝࡜⪃࠼ࡽࢀࡿ㸬ࡋ࠿ࡋ㸪▷࠸ᮇ㛫ࡢỈᩥほ ㈨ᩱ࡟ᇶ࡙࠸࡚
࠸ࡿ࡜࠸࠺ࡇ࡜ࡶ࠶ࡾ㸪༓ⴥ࣭Ỉᒣ17)ࡢホ౯࡛ࡣ㛗Ẋᆅ༊ࡼࡾࡶᰩᖹᆅ༊ࡢኳ↛ࢲ࣒ࡢ᪉ࡀ‶Ỉࡋ࡟ࡃ࠸ࡼ࠺࡟ࡶぢ࠼ࡿ⤖ᯝ࡜࡞ࡗ࡚࠾ࡾ㸪ࡲࡓ㸪ᶓᒣ18)ࡽࡢ᳨ウ⤖ᯝ࡛ࡶ㸪ࢢࣛࣇࡀ୧ᑐᩘ࡛ࡤࡽࡘࡁࡀ኱ࡁ࠸࡜࠸࠺ࡇ࡜ࡶ࠶ࡿࡀ㸪㛗Ẋᆅ༊ࡶᰩᖹᆅ༊ࡶ㉺ὶࡋࡸࡍࡉࡣ࠶ࡲࡾኚࢃࡽ࡞࠸ࡼ࠺࡟ࡶぢ࠼ࡿ㸬ࡲࡓ㸪⏣⏿ࡽ11)ࡢศᯒ࡟࠾ࡅ
ࡿ‣Ỉ㔞㸭ࣆ࣮ࢡὶ㔞࣭ᖹᆒὶ㔞ࡢ㛵ಀ࡟࠾࠸࡚ࡶ୧ᑐᩘࡢࢢࣛࣇୖ࡛ࡶ᫂░࡞㛵ಀᛶࡣぢ࠸ฟࡏ࡞࠸㸬ࡑࢀࡽࡢཎᅉ࡜ࡋ࡚ࡣ㸪ண ࡟⏝࠸ࡿࣃ࣓࣮ࣛࢱࡢ࠺ࡕ㸪ὶධ㔞ࡢẚὶ㔞ࡀ୍ᐃ࡜࠸ࡗࡓከࡃࡢ௬ᐃ࡟ᇶ࡙࠸᳨࡚ウࡋ࡚࠸ࡿࡇ࡜ࡀཎᅉࡢ㸯ࡘ࡜⪃࠼ࡽࢀࡿ㸬ኳ↛ࢲ࣒ࡀ㉺ὶࡍࡿ࠿࡝࠺࠿ࡣ㸪㝆㞵࢖࣋ࣥࢺ๓ࡢ‣Ỉụࡢ✵ࡁᐜ㔞ࡀࡑࡢ㝆㞵࢖࣋ࣥࢺ࡛ὶධࡍࡿ⥲ὶ㔞࠿ࡽ₃Ỉ㔞ࢆᕪࡋᘬ࠸ࡓỈ㔞௨ୗ࡜࡞ࡿ࠿࡝࠺࠿࡜࠸ࡗࡓỈ཰ᨭⓗ࡞ほⅬࡸẼೃᏛⓗ࡞せᅉࢆホ౯ࡍࡿࡇ࡜ࡀ㔜せ࡛࠶ࡿ࡜⪃࠼ࡽࢀࡿ㸬ᮏ✏ࡣ㉺ὶ≧ἣࡀ኱ࡁࡃ␗࡞ࡿ㛗Ẋᆅ༊࡜ᰩᖹᆅ༊࡟ࡘ࠸࡚㸪ᩘᖺ㛫ࡢỈᩥほ ㈨ᩱࡀ⵳✚ࡉࢀࡓ⌧᫬Ⅼ࡟࠾࠸࡚㸪⛅ᒣࡽࡢኳ↛ࢲ࣒ࡢ㏱Ỉಀᩘ࡟ࡼࡿ₃Ỉ㔞ࡢ⟬ᐃ19)ࡸࡑࢀ࡟ᇶ࡙ࡃ⢭ᗘࡢ㧗࠸Ỉ཰ᨭ⟬ᐃ᪉ἲ20)࡟ࡼࡾ㉺ὶ౵㣗ࡢࡋࡸࡍࡉࡢẚ㍑ࢆ⾜࠺࡜࡜ࡶ࡟㸪㝆㞵≉ᛶࡢ㐪࠸ࡸ₃Ỉ≉ᛶࡢ㐪࠸㸪ὶฟ≉ᛶ࡞࡝ࡢ㸪ኳ↛ࢲ࣒ࡢ㉺ὶ౵㣗ࡢ༴㝤ᗘホ౯࡟⪃៖ࡍ࡭ࡁỈᩥᏛ࣭Ẽೃ≉ᛶ࡟㛵ࡍࡿ㡯┠ࡶྵࡵ᳨࡚ウࢆ⾜ࡗࡓࡶࡢ࡛࠶ࡿ㸬㸬᳨ウᑐ㇟࡜ࡋࡓኳ↛ࢲ࣒ࡢᴫせ ௒ᅇ᳨ウᑐ㇟࡜ࡋࡓ㛗Ẋᆅ༊࡜ᰩᖹᆅ༊ࡢ㸰ࡘࡢኳ↛ࢲ࣒ࡢᴫせࢆ௨ୗ࡟♧ࡍ㸬 㛗Ẋᆅ༊ࡢኳ↛ࢲ࣒ࡢᴫせ 㛗Ẋᆅ༊ࡢኳ↛ࢲ࣒ࡣዉⰋ┴ྜྷ㔝㒆༑ὠᕝᮧ㛗Ẋᆅෆ࡟ ࠶ ࡾ 㸪 ሐ య ࡢ 㧗 ࡉ ࡣ ⣙ 80m 㸪 ‣ Ỉ ᐜ 㔞 ࡣ ⣙1,935,500m3(2012ᖺ5᭶᫬Ⅼ)㸪‣ỈụᆅⅬࡢὶᇦ㠃✚ࡣ
⣙4.62km2࡛࠶ࡾ㸪Ỉᩥほ ᪋タ࡜ࡋ࡚ࡣ㌿ಽࡲࡍᘧ㞵㔞ィ㸪‣ỈụࡢỈ఩ィ㸪ሐయᏍෆỈ఩ィ㸪ୖὶἙ㐨࡟Ỉ఩ィࡀタ⨨ࡉࢀ࡚࠸ࡿ㸬ᅗ࡟♧ࡍࡼ࠺࡟2015ᖺ࡜2020ᖺ࡟‶Ỉ࡟㏆࠸Ỉ఩࡜࡞ࡗࡓࡶࡢࡢ2011ᖺࡢኳ↛ࢲ࣒ᙧᡂᚋ㸪㐣ཤ1ᗘࡶ㉺ὶࡋ࡚࠾ࡽࡎ㸪⅏ᐖᚋ࡟タ⨨ࡉࢀࡓ௬᤼Ỉ㊰ࡣ2021ᖺ᫬Ⅼ࡛ࡶ೺඲࡞≧ែ࡛࠶ࡿ㸬࡞࠾㸪ὶᇦ㠃✚㸪ኳ↛ࢲ࣒ࡢ㧗ࡉ㸪ኳ↛ࢲ࣒ࡢయ✚࠿ࡽồࡲࡿ
Ermini and Casagli 13)ࡢDBIࡣ2.0921)࡛࠶ࡾ㸪DBI<2.75࡛࠶
ࡿࡇ࡜࠿ࡽࡑࡢุᐃᇶ‽࡛ࡣᏳᐃ࡜༊ศࡉࢀࡿ㸬 ᰩᖹᆅ༊ࡢኳ↛ࢲ࣒ࡢᴫせ ᰩᖹᆅ༊ࡢኳ↛ࢲ࣒ࡣዉⰋ┴ྜྷ㔝㒆ෆཎᆅෆ࡟࠶ࡿኳ↛ࢲ࣒࡛㸪⅏ᐖ┤ᚋࡢሐయ㧗ࡉࡣ⣙100m࡛㸪‣Ỉᐜ㔞
⣙5,169,600m3(2012ᖺ5᭶᫬Ⅼ)㸪ୖὶὶᇦ㠃✚⣙8.95km2㸪Ỉᩥほ ᪋タࡣ㛗Ẋᆅ༊࡜ྠᵝ࡟㸪㌿ಽࡲࡍ㞵㔞ィ㸪‣ỈụࡢỈ఩ィ㸪ሐయࡢᏍෆỈ఩ィ㸪ኳ↛ࢲ࣒ୖὶࡢἙ㐨࡟Ỉ఩ィࡀタ⨨ࡉࢀ࡚࠸ࡿ㸬ࡇࡢኳ↛ࢲ࣒ࡣᅗ࡟♧ࡍ
ࡼ࠺࡟2012ᖺ௨㝆㸪ẖᖺࡢࡼ࠺࡟㉺ὶࡋ㸪୰࡛ࡶ≉࡟
2014ᖺࡢྎ㢼➨11ྕ㸪2015ᖺࡢྎ㢼➨11ྕ㸪2018ᖺࡢྎ㢼➨21ྕ࡞࡝኱つᶍ࡞㉺ὶ౵㣗ࡀⓎ⏕ࡋ࡚࠾ࡾ㸪2011ᖺ
᫬Ⅼ࠿ࡽ⣙38mࡶ౵㣗ࡉࢀ࡚࠸ࡿ㸬ࡲࡓ㸪2014ᖺࡢฟỈ࡛ࡣሐయࡢᏍෆỈ఩ィࡀ౑⏝୙ྍ⬟࡜࡞ࡗࡓ㸬2011ᖺࡢ
⅏ᐖ┤ᚋࡢDBIࡣ1.85࡜㛗Ẋᆅ༊ࡼࡾࡶᑠࡉ࠸್࡜࡞ࡗ࡚࠾ࡾ㸪Ermini et al.13)ࡢุᐃᇶ‽࡛ࡣ㛗Ẋᆅ༊࡜ྠᵝ࡟Ᏻᐃ࡜༊ศࡉࢀࡿ㸬㸬᳨ウ᪉ἲ ኳ↛ࢲ࣒ࡢỈ཰ᨭࡢ⟬ᐃ᪉ἲ⌧ᅾ㸪㛗Ẋ࣭ᰩᖹࡢ୧ᆅ༊࡛Ỉᩥほ ࡜ࡋ࡚㸪㞵㔞ほ㸪ኳ↛ࢲ࣒‣ỈụỈ఩ཬࡧ㉺ὶᶆ㧗ࡢィ 㸦Ỉ‽㔞㸧㸪ኳ↛ࢲ࣒ὶධ㔞ィ 㸦Ỉ఩ィ ➼㸧ࢆ⾜ࡗ࡚࠸ࡿ㸬ኳ↛ࢲ࣒ୖὶ࡟࠾࠸࡚㸪Ỉ఩ィ࡜ὶ㏿ィ࡟ࡼࡾ㐃⥆ⓗ࠿ࡘ┤᥋ⓗ࡟ὶධ㔞ࢆィ ࡍࡿࡇ࡜ࡣ㸪ၟ⏝㟁※ࡢ☜ಖࡢၥ㢟࠿ࡽᅔ㞴࡛࠶ࡿ㸬ࡑࡇ࡛㸪ほ ᶵჾⅬ᳨᫬࡟ᐇ᪋࡛ࡁࡿ㟁☢ὶ㏿ィ࡟ࡼࡿὶ㔞ほ ࡛ኳ↛ࢲ࣒ୖὶ఩⨨ࡢἙ㐨࡟࠾࠸࡚Ỉ఩ࡢప࠸⠊ᅖ࡛㸪ẚ㍑ⓗ⢭ᗘࡢ㧗࠸H-Q᭤⥺ࢆồࡵ㸪ࡑࡢᮇ㛫࡛ࡑࡢH-Q᭤⥺ࡸሐయࡢ࣮࣎ࣜࣥࢢ
ᏍෆỈ఩ࢆᇶ࡟ࢲࣝࢩ࣮๎࡟ᇶ࡙࠸࡚ồࡵࡓ㏱Ỉಀᩘ20)
࡛₃Ỉ㔞ࢆ᥎ᐃࡋ㸪ࡑࡢ₃Ỉ㔞࡜㈓Ỉቑῶ㔞ࢆຍ࠼㸪㉺ὶ᫬ࡣ௬᤼Ỉ㊰㉺ὶ㔞ࡶຍ࠼㸪ኳ↛ࢲ࣒ὶධ㔞ࢆồࡵࡿࡇ࡜࡛㸪ྛኳ↛ࢲ࣒ࡢ㝆㞵࢖࣋ࣥࢺࡈ࡜ࡢỈ཰ᨭࢆᢕᥱ
ࡋࡓ㸬ᅗ࡟ኳ↛ࢲ࣒࿘㎶ࡢỈ཰ᨭࡢᴫᛕᅗࢆ♧ࡍ㸬ࡲࡓ㸪Ỉ཰ᨭࡢ⟬ᐃᘧࡸලయⓗ࡞⟬ᐃ᪉ἲࢆ௨ୗ࡟♧ࡍ㸬
D ₃Ỉ㔞ཬࡧኳ↛ࢲ࣒ሐయࡢ㏱Ỉಀᩘࡢ⟬ᐃ᪉ἲ₃Ỉ㔞ཬࡧኳ↛ࢲ࣒ሐయࡢ㏱Ỉಀᩘࡣ㸪ኳ↛ࢲ࣒ሐయࡢ₃Ỉࡀࢲࣝࢩ࣮ࡢἲ๎࡟ᚑ࠺࡜௬ᐃࡍࡿ⛅ᒣࡽ19)ࡢ♧ࡋࡓᘧ(1)ཬࡧ(2)ࢆ㐺⏝ࡋࡓ㸬ලయⓗ࡟ࡣኳ↛ࢲ࣒ሐయ
ࡢ㏱Ỉಀᩘksࡣኳ↛ࢲ࣒ሐయ࡟࠾ࡅࡿ2⟠ᡤࡢ࣮࣎ࣜࣥࢢᏍෆỈ఩࠿ࡽồࡵࡽࢀࡿືỈ໙㓄dz/dx࡜ሁ✚ᅵ◁ෆࡢ㏻Ỉ᩿㠃✚Aࢆ⏝࠸㸪ࡲࡓ㸪᥎ᐃ⢭ᗘࡢ☜ಖࡢࡓࡵኳ↛ࢲ࣒ୖὶࡢH-Q᭤⥺ࡢ㐺⏝Ỉ఩⠊ᅖෆᮇ㛫࡟࠾ࡅࡿ㏱Ỉ
ಀᩘKsࢆ㏫⟬ࡋ࡚⟬ฟࡋ㸪ࡑࡢᖹᆒ್ࢆ᥇⏝ࡋ࡚࠸ࡿ㸬―8―݀‫ݖ‬‫       ܣ ڄ‬ሺ1ሻ݀‫ݔ‬݀‫ݒ‬ܳ௜௡ െ݀‫         ݐ‬ሺ2ሻ
݇௦ ൌ݀‫ݖ‬െ‫ܣڄ‬݀‫ݔ‬ܳ ሺܳ௢௨௧ ሻ ൌ െ݇௦ ‫ڄ‬ᅗ 㛗Ẋᆅ༊ࡢኳ↛ࢲ࣒ࡢỈ఩ᶆ㧗࡜㉺ὶᶆ㧗 㹼 ᅗ ᰩᖹᆅ༊ࡢኳ↛ࢲ࣒ࡢỈ఩ᶆ㧗࡜㉺ὶᶆ㧗 㹼 ጞࡵ࠿ࡽ㸪Ỉ఩ୖ᪼ࡢࡢࡕඖࡢỈ఩࡟ᡠࡗࡓ᫬ᮇࡲࡓࡣ
Ỉ఩పୗᚋ࡟Ỉ఩ࡀᏳᐃࡋࡓ᫬ᮇࡲ࡛࡜ࡋࡓ㸬݀‫ݒ‬൅ ܳ௢௨௧ ൅ ܳ௢௩ ൅ ܳௗ௥ ሺ3ሻܳ௜௡ ൌ݀‫ݐ‬σܳ௜௡݂ൌ          ሺ4ሻσܴࡇࡇ࡟㸪Qinࡣኳ↛ࢲ࣒ὶධ㔞(mm)㸪dv/dtࡣ㈓Ỉቑῶ㔞(mm)㸪Qoutࡣኳ↛ࢲ࣒࠿ࡽࡢ₃Ỉ㔞(mm)㸪Qovࡣ㉺ὶ 㔞(mm)㸪Qdrࡣ࣏ࣥࣉ࡟ࡼࡿ᤼Ỉ㔞(mm)㸪f ࡣὶฟ⋡㸪ᅗỈ཰ᨭᴫᛕᅗ
R㸸㞵㔞(mm)࡛࠶ࡿ㸬㞵㔞ࡣ⌧ᆅ࡛ࡢ㌿ಽࡲࡍ㞵㔞ィ࡟ࡼࡿ㞵㔞ࢆ⏝࠸㸪ᦆኻ㞵㔞ࡣ㝆㞵࢖࣋ࣥࢺࡈ࡜ࡢ⥲㞵㔞ȊR࠿ࡽኳ↛ࢲ࣒⥲ࡇࡇ࡟㸪ksࡣ㣬࿴㏱Ỉಀᩘ㸪dz/dxࡣືỈ໙㓄㸪Qinࡣኳ
↛ࢲ࣒ὶධ㔞㸪dv/dtࡣ㈓Ỉቑῶ㔞㸪Aࡣ㏻Ỉ᩿㠃㸦ᾐ㏱ὶධ㔞ȊQinࢆᕪࡋᘬ࠸࡚ồࡵࡓ㸬㠃✚㸧࡛࠶ࡿ㸬ࡓࡔࡋ㸪ᮏ᳨ウ࡛ࡣᐇ㝿࡟ࡣdv/dtࡣᴟࡵኳ↛ࢲ࣒ὶධ㔞Qinࡣa)࡟♧ࡋࡓ᪉ἲ࡛⟬ᐃࡋࡓ㏱Ỉಀ࡚ᑠࡉ࠸᫬ᮇࡢࢹ࣮ࢱ࡛⟬ᐃࡋ࡚࠸ࡿ㸬ᩘ࠿ࡽồࡵࡓࢲ࣒₃Ỉ㔞࡟㸪ኳ↛ࢲ࣒ࡢH-V᭤⥺࡜Ỉ఩E Ỉ཰ᨭࡢ⟬ᐃࢹ࣮ࢱ࠿ࡽồࡵࡓ㈓Ỉቑῶ㔞ࢆຍ࠼࡚⟬ฟࡋࡓ᥎ᐃ್࡛19)ኳ↛ࢲ࣒࿘㎶ࡢỈ཰ᨭࡣ㸪⛅ᒣࡽ ࡟♧ࡉࢀ࡚࠸ࡿỈ࠶ࡾ㸪࣏ࣥࣉ࡟ࡼࡿ᤼Ỉࢆᐇ᪋ࡋ࡚࠸ࡿᮇ㛫࡟ࡘ࠸࡚ࡣ࣏ࣥࣉ᤼Ỉ㔞Qdrࢆ⪃៖ࡋࡓ㸬ࡲࡓ㸪ྎ㢼᫬➼ࡢ௬᤼Ỉ཰ᨭࡢᘧ࡟௬᤼Ỉ㊰ࡢ㉺ὶཬࡧ࣏ࣥࣉ➼࡟ࡼࡿ᤼Ỉࢆ⪃㊰ࡢ㉺ὶ㔞Qovࡣ㉺ὶỈ῝ཬࡧ௬᤼Ỉ㊰ࡢㅖඖ࡟ᇶ࡙ࡁ
៖ࡋࡓᘧ(3)࡟ࡼࡾ㸪ᚋ㏙ࡍࡿὶฟ≉ᛶẚ㍑ࡢࡓࡵࡢὶฟ⋡ࡣᘧ(4)࡟࡚ồࡵࡓ㸬࡞࠾㸪ࡇࡇ࡛ࡣ㞵㔞࡜ᑐẚࡉ࣐ࢽࣥࢢ࡟ࡼࡿ➼ὶィ⟬࡟࡚ồࡵࡓ㸬ࡏࡿࡓࡵ㸪ᘧ(3)࡟♧ࡍὶධ㔞➼࡟ࡘ࠸࡚ࡶὶᇦ㠃✚᳨࡛ウᑐ㇟࡜ࡋࡓ㝆㞵࢖࣋ࣥࢺࡣ࠶ࡿ⛬ᗘࡢὶධ㔞ࡀぢ㝖ࡋ࡚mm᥮⟬ࡍࡿࡇ࡜࡟ࡼࡾὶධ㧗࡜ࡋ࡚࠸ࡿ㸬ࡲࡓ㸪 ㎸ࡵࡿ㐃⥆㞵㔞50mm௨ୖࡢ㝆㞵࢖࣋ࣥࢺ࡜ࡋ㸪㛗ẊᆅỈ཰ᨭࡢィ⟬᫬㛫㛫㝸ࡣ1.0hr࡜ࡋ࡚࠸ࡿ㸬࡞࠾㸪Ỉ཰ᨭ༊ࡢ᳨ウᑐ㇟ᮇ㛫ࡣỈ཰ᨭ⟬ฟᮇ㛫࡛࠶ࡿ2012ᖺ(H24)ࡢ᳨ウᑐ㇟ᮇ㛫ࡣ24᫬㛫↓㝆㞵࡛༊ษࡽࢀࡿ㝆㞵ࡢ㝆ࡾ࠿ࡽ2020ᖺ(R2)ࡲ࡛ࡢ9ᖺ㛫㸪ᰩᖹᆅ༊ࡢ᳨ウᑐ㇟ᮇ㛫


―9―


⾲ ྛᖺ࡟࠾ࡅࡿᖺ᭱኱㐃⥆㞵㔞⾲ኳ↛ࢲ࣒ୖὶὶᇦ㠃✚࡜‣Ỉụᐜ㔞ࡢẚ⋡ᅗ ኳ↛ࢲ࣒ୖὶᇦࡢὶฟ⋡
ࡣ2012ᖺ(H24)࠿ࡽ2014ᖺ(H26)ྎ㢼➨11ྕ࡟ࡼࡿ㉺ὶ౵㣗ᔂቯࡲ࡛ࡢ3ᖺ㛫࡜ࡋࡓ㸬 Ỉᩥ≉ᛶࡢ㐪࠸࡟ࡼࡿỴቯࡢࡋࡸࡍࡉࡢ᳨ウ᪉ἲᅗ㛗Ẋᆅ༊ࠊᰩᖹᆅ༊࡟࠾ࡅࡿᖺᖹᆒ㏱Ỉಀᩘࡢ᥎⛣㛗Ẋᆅ༊࡜ᰩᖹᆅ༊ࡢ㉺ὶ౵㣗ࡢࡋࡸࡍࡉࡢཎᅉ࡜
࡞ࡗ࡚࠸ࡿせᅉࡣኳ↛ࢲ࣒ࡢᐜ㔞㸪ὶᇦ㠃✚ࡔࡅ࡛࡞ࡃ㸪 ᐜ㔞ࡣ㛗Ẋᆅ༊ࡼࡾᰩᖹᆅ༊ࡢ᪉ࡀ1.93ಸࡶ኱ࡁ࠸ࡀ㸪ୖὶὶᇦ㠃✚࡜‣Ỉụᐜ㔞ࡢẚ⋡ࢆࡳࡿ࡜ᰩᖹᆅ༊ࡢ᪉㝆㞵≉ᛶࡸ₃Ỉ㔞࡞࡝ࡀ」ྜⓗ࡟㛵ಀࡋ࡚࠸ࡿ࡜⪃࠼ࡽࡀ኱ࡁ࠸ࡓࡵ㉺ὶࡋ࡟ࡃ࠸≧ἣ࡛࠶ࡿ࡜⪃࠼ࡽࢀࡿ㸬ࢀࡿ㸬ࡑࡇ࡛㸪ᮏ◊✲࡛ࡣձ㝆㞵≉ᛶࡢ㐪࠸㸪ղࢲ࣒ୖὶὶᇦ㠃✚࡜‣Ỉụᐜ㔞ࡢẚ⋡㸪ճὶฟ≉ᛶࡢ㐪࠸㸪մ ὶฟ≉ᛶࡢ㐪࠸₃Ỉ≉ᛶࡢ㐪࠸ࡢ4ࡘࡢ㡯┠࡛ẚ㍑ࢆ⾜ࡗࡓ㸬2ࡘࡢኳ↛ࢲ࣒ࡢὶฟ≉ᛶࡢ㐪࠸ࡢẚ㍑ࡢࡓࡵ㸪ᅗ࡟ὶฟ⋡㸦⥲㞵㔞࡜ኳ↛ࢲ࣒ὶධ㧗࡜ࡢ㛵ಀ㸧ࢆ♧ࡍ㸬㸬᳨ウ⤖ᯝ㛗Ẋᆅ༊ࡢὶฟ⋡ࡣf=0.41⛬ᗘ࡛࠶ࡿࡢ࡟ᑐࡋ㸪ᰩᖹᆅ༊ࡣf=0.69࡜⣙1.7ಸࡶὶฟ⋡ࡀ኱ࡁ࠸㸬ࡇࡢࡓࡵ㸪㛗Ẋ 㝆㞵≉ᛶࡢ㐪࠸ᆅ༊ࡼࡾࡶᰩᖹᆅ༊ࡢ᪉ࡀኳ↛ࢲ࣒࡟Ỉࡀὶධࡋࡸࡍ࠸ ኳ↛ࢲ࣒ࡢ‣Ỉࡣὶᇦෆࡢ㝆㞵࡟㉳ᅉࡍࡿୖὶ࠿ࡽࡢ
ࡇ࡜ࡀࢃ࠿ࡿ㸬ὶฟ㔞ࡢ㈓␃࡛࠶ࡿࡇ࡜࠿ࡽ㸪㛗Ẋᆅ༊࡜ᰩᖹᆅ༊ࡢ㝆㞵≉ᛶࡢẚ㍑ࢆ⾜࠺ୖ࡛ࡣ㸪▷ᮇ㝆㞵ᣦᶆ࡛ࡣ࡞ࡃ㸪㛗 ሐయࡢ₃Ỉ≉ᛶࡢ㐪࠸ᮇ㞵㔞ᣦᶆ࡜࡞ࡿ24᫬㛫↓㝆㞵࡛༊ษࡗࡓ㐃⥆㞵㔞࡛ẚ
D ㏱Ỉಀᩘࡢ⤒ᖺኚ໬㍑ࡋࡓ㸬⌧ᆅ㞵㔞ィࡢほ ࢹ࣮ࢱ࠿ࡽྛᖺᗘࡢ᭱኱㐃⥆ኳ↛ࢲ࣒ࡢ₃Ỉ㔞ࡀ኱ࡁ࠸᪉ࡀ㸪‣Ỉụࡢ✵ࡁᐜ㔞ࡢ㞵㔞ࢆ⾲࡟♧ࡍ㸬2015ᖺ௨እࡣࡍ࡭࡚ᰩᖹᆅ༊ࡢ᪉ࡀ
☜ಖࡀࡋࡸࡍ࠸࡜࠸࠼ࡿ㸦ࣃ࢖ࣆࣥࢢࡀ⏕ࡌ࡞࠸⛬ᗘ࡛኱ࡁࡃ㸪᭱኱࡛㛗Ẋᆅ༊ࡢ1.79ಸ࡜࡞ࡗ࡚࠸ࡿᖺࡶ࠶ࡿ㸬 ࠶ࡿࡇ࡜ࡀ๓ᥦ࡜࡞ࡿ㸧㸬ᅗ࡟➨3❶࡟♧ࡋࡓ᪉ἲ࡛ྛᖺࡢ᭱኱㐃⥆㞵㔞ࡢᖹᆒ್࡛25㸣⛬ᗘᰩᖹᆅ༊ࡢ᪉ࡀồࡵࡓኳ↛ࢲ࣒ሐయ㒊ศࡢ㏱Ỉಀᩘࢆ♧ࡍ㸬࡞࠾㸪ᰩᖹ㝆㞵㔞ࡣ኱ࡁࡃ࡞ࡗ࡚࠾ࡾ㸪㝆㞵≉ᛶཬࡧ4(3)࡟♧ࡍὶᆅ༊ࡣኳ↛ࢲ࣒ࡢሐయࡢ࣮࣎ࣜࣥࢢᏍࡀὶኻࡍࡿ2014ᖺฟ≉ᛶ࠿ࡽࡶᰩᖹᆅ༊ࡢ᪉ࡀ㉺ὶࡋࡸࡍ࠸ࡇ࡜ࡀࢃ࠿ࡿ㸬 ࡢ኱つᶍ࡞㉺ὶ౵㣗Ⓨ⏕௨๓ࡢࢹ࣮ࢱࢆ♧ࡋ࡚࠸ࡿ㸬㛗Ẋᆅ༊ࡢ᪉ࡀᰩᖹᆅ༊࡟ẚ࡭࡚ᖺᖹᆒ㏱Ỉಀᩘࡀ኱ ኳ↛ࢲ࣒ୖὶὶᇦ㠃✚࡜‣Ỉụᐜ㔞ࡢẚ⋡ࡁ࠸ഴྥ࡜࡞ࡗ࡚࠸ࡿ㸬ࡲࡓ㸪㏱Ỉಀᩘ࡟ࡣ⤒ᖺኚ໬ࡀኳ↛ࢲ࣒ୖὶὶᇦ㠃✚࡟ᑐࡍࡿ‣Ỉụࡢᐜ㔞ࡢ๭ྜࢆࡳࡽࢀ㸪㛗Ẋᆅ༊ࡢ㏱Ỉಀᩘࡣ඲య࡜ࡋ࡚ࡣ㏱Ỉಀᩘࡀ‣Ỉụࡢᐜ㔞ࢹ࣮ࢱࡢ᭦᪂㸦῝ὸ 㔞⤖ᯝ㸧ࡈ࡜࡟⟬ฟᑠࡉࡃ࡞ࡿഴྥ࡜࡞ࡗ࡚࠾ࡾ㸪ࡇࢀࡣ‣Ỉụෆࡢ⢓ᅵ࡞ࡋࡓࡶࡢࢆ⾲࡟♧ࡍ㸬࡝ࡢ⣽⢏ᅵ◁ࡢሁ✚࡟ࡼࡿ⿕そࡀᙳ㡪ࡋ࡚࠸ࡿ࡜⪃࠼ࡽ㛗Ẋᆅ༊ࡢኳ↛ࢲ࣒ୖὶὶᇦ㠃✚ࡣ4.63km2㸪ᰩᖹᆅࢀࡿ㸬2014ᖺࡢᰩᖹᆅ༊ࡢᖺᖹᆒࡢ㏱Ỉಀᩘࡀ๓ᖺᗘ࡜2
༊ࡣ8.95km ࡛࠶ࡾ㸪ὶᇦ㠃✚࠶ࡓࡾࡢኳ↛ࢲ࣒‣Ỉụẚ࡭࡚኱ࡁࡃ࡞ࡗ࡚࠸ࡿࡀ㸪ࡇࢀࡣỈ఩ࡀ㧗࠸≧ែࡀ⥅
― 10 ―

ᅗ 㝆㞵࢖࣋ࣥࢺ┤๓ࡢኳ↛ࢲ࣒✵ࡁᐜ㔞࡜ኳ↛ࢲ࣒ᅗྛᖺࡢฟỈᮇᖹᆒኳ↛ࢲ࣒✵ࡁᐜ㔞࡜ฟỈᮇᖹᆒὶධ㧗࡜ࡢ㛵ಀኳ↛ࢲ࣒₃Ỉ㧗࡜ࡢ㛵ಀ⥆ࡋ㸪ᙜ᫬タ⨨ࡉࢀ࡚࠸ࡓᬯῺ᤼Ỉ⟶ࡀᖖ᫬ᶵ⬟ࡋ࡚࠸ࡓࡇ࡜ࡀᙳ㡪ࡋ࡚࠸ࡿࡓࡵ࡛࠶ࡾ㸪2014ᖺ࡟㝈ࡗ࡚ࡣᬯῺ᤼Ỉ⟶࠿ࡽࡢ᤼Ỉ㔞ࡢᙳ㡪ࢆྵࢇࡔ್࡜࡞ࡗ࡚࠸ࡿ㸬࡞࠾㸪ᅗ࡟♧ࡋࡓỈᩥほ ࢹ࣮ࢱ࡟ᇶ࡙ࡃ㛗Ẋᆅ༊ࡢኳ↛ࢲ࣒ࡢ㏱Ỉಀᩘࡣ㸪ᴫࡡ2.0㹼4.010-4 m/s࡜࡞ࡗ࡚࠸ࡿࡢ࡟ᑐࡋ㸪2012ᖺ࡟ᐇ᪋ࡋ࡚࠸ࡿ㛗Ẋᆅ༊ࡢኳ↛ࢲ࣒ሐయ㒊ศࡢ⌧ᆅࡢ࣮࣎ࣜࣥࢢㄪᰝ࡛ᐇ᪋ࡋࡓ⌧ሙ㏱
Ỉヨ㦂ࡢ⤖ᯝࡣ1.6110-6㹼7.3310-4m/s࡛࠶ࡾ㸪ᅗࡢࢹ࣮ࢱࡣࡑࡢ⠊ᅖ࡟ྵࡲࢀ࡚࠸ࡿ㸬E ฟỈᮇᖹᆒ₃Ỉ㔞࡜✵ࡁᐜ㔞࡜ࡢẚ⋡ฟỈᮇ㸦6/1㹼10/31㸧ࡢᖹᆒኳ↛ࢲ࣒₃Ỉ㔞ࢆồࡵ㸪㉺ὶ౵㣗ࡋࡸࡍ࠸ฟỈᮇ࡟࠾ࡅࡿᖹᆒኳ↛ࢲ࣒✵ࡁᐜ㔞࡜ࡢ㛵ಀࢆᅗ࡟♧ࡍ㸬࡞࠾㸪ኳ↛ࢲ࣒ࡢ✵ࡁᐜ㔞ࡢ್ࡣ㝆㞵࡜ẚ㍑ࡋࡸࡍ࠸ࡼ࠺࡟ὶᇦ㠃✚࡛㝖ࡋ࡚༢఩ࢆࠕ✵ࡁᐜ㔞㧗࡛ࠖ⾲⌧ࡋ࡚࠸ࡿ㸬ࡲࡓ㸪ᰩᖹᆅ༊ࡣ2012
ᖺ(H24)࠿ࡽ2014ᖺ(H26)ྎ㢼11ྕ࡟ࡼࡿ㉺ὶ౵㣗ᔂቯࡲ
࡛ࡢ3ᖺ㛫ࢆᑐ㇟࡜ࡋ࡚࠸ࡿ㸬ฟỈᮇᖹᆒࡢኳ↛ࢲ࣒₃Ỉ㔞㸪ฟỈᮇᖹᆒࡢኳ↛ࢲ࣒✵ࡁᐜ㔞࡜ࡶ࡟ᰩᖹᆅ༊ࡢ᪉ࡀᑠࡉࡃ㸪ᖹᆒⓗ࡟㛗Ẋᆅ༊ࡼࡾࡶᰩᖹᆅ༊ࡢ᪉ࡀ‶Ỉ࡟㏆࠸Ỉ఩ࡢ㧗࠸≧ែ࡟࠶ࡿࡀ㸪ᰩᖹᆅ༊ࡢ᪉ࡀᖹᆒⓗ࡞㏱Ỉಀᩘࡀᑠࡉ࠸ࡓࡵ⤖ᯝⓗ࡟₃Ỉ㔞ࡀᑡ࡞ࡃ࡞ࡗ࡚࠸ࡿ࡜⪃࠼ࡽࢀ㸪ࡇࡢࡇ࡜࡟ࡼࡾᰩᖹᆅ༊࡟࠾࠸࡚ࡣỈ఩ୖ᪼ᚋ㸪₃Ỉ࡟ࡼࡗ࡚Ỉ఩పୗࡋ࡟ࡃࡃ࡞ࡗ࡚࠸ࡿࡓࡵ࡜⪃࠼ࡽࢀࡿ㸬ࡲࡓ㸪ᅗ࡟♧ࡋࡓ⥲㞵㔞50mm௨ୖࡢ㝆㞵࢖࣋ࣥࢺࢆᑐ㇟࡜ࡋࡓ㝆㞵࢖࣋ࣥࢺ┤๓ࡢኳ↛ࢲ࣒ࡢ✵ࡁᐜ㔞࡜ὶධ㧗ࡢ㛵ಀ࡛ࡶ㸪ᰩᖹᆅ༊ࡢ᪉ࡀኳ↛ࢲ࣒ὶධ㔞ࡣ኱ࡁ࠸࢖࣋ࣥࢺࡀ࠶ࡿ࡟ࡶ㛵ࢃࡽࡎ㸪㝆㞵࢖࣋ࣥࢺ┤๓ࡢ✵ࡁᐜ㔞ࡀᑠࡉ࠸ഴྥ࡜࡞ࡗ࡚࠸ࡿ㸬཯ᑐ࡟㛗Ẋᆅ༊ࡣኳ↛ࢲ࣒ࡢὶධ㧗ࡀᑠࡉࡃ㸪ฟỈ┤๓ࡢ✵ࡁᐜ㔞ࡶ኱ࡁࡃ㸪ࡇࡇ࡛ࡶᰩᖹᆅ༊ࡢ᪉ࡀ㉺ὶࡋࡸࡍ࠸ഴྥ࡟࡞ࡗ࡚࠸ࡿ㸬࡞࠾㸪₃Ỉ㔞ࡣ㏱Ỉಀᩘࡔࡅ࡛࡞ࡃ㸪㏻Ỉ㠃✚ࡢᙳ㡪ࡶ࠶ࡿࡓࡵ㸪ኳ↛ࢲ࣒ࡢ3ḟඖⓗ࡞ᙧ≧➼ࡶᙳ㡪ࡋ࡚࠸ࡿྍ⬟ᛶࡀ࠶ࡿ㸬㸬࠾ࢃࡾ࡟ᮏ◊✲࡛ࡣ㸪2011ᖺ⣖ఀ༙ᓥ኱Ỉᐖ࡛⏕ࡌࡓኳ↛ࢲ࣒ࡢ࠺ࡕ㸪㉺ὶ≧ἣࡢ኱ࡁࡃ␗࡞ࡿ㛗Ẋᆅ༊࡜ᰩᖹᆅ༊ࡢኳ↛ࢲ࣒ࢆᑐ㇟࡟㸪ձ㝆㞵≉ᛶࡢ㐪࠸㸪ղࢲ࣒ୖὶὶᇦ㠃✚࡜‣Ỉụᐜ㔞ࡢẚ⋡㸪ճὶฟ≉ᛶࡢ㐪࠸㸪մ₃Ỉ≉ᛶࡢ㐪࠸ࢆẚ㍑ࡋ㸪௨ୗ࡟♧ࡍࡼ࠺࡟ձ㸪ճ㸪մࡢ㡯┠࡛㛗Ẋᆅ༊ࡼࡾࡶᰩᖹᆅ༊ࡢ᪉ࡀ㸪㉺ὶࡋࡸࡍ࠸⎔ቃ࡜࡞ࡗ࡚࠸ࡓ㸬࣭ 㝆㞵≉ᛶ㸸㛗Ẋᆅ༊ࡼࡾࡶᰩᖹᆅ༊ࡢᖺᖹᆒ᭱኱㞵㔞ࡢ᪉ࡀ⣙1.25ಸ㔞኱ࡁ࠸㸬࣭ ୖὶὶᇦ㠃✚࡜‣Ỉụᐜ㔞ࡢẚ⋡㸸㛗Ẋᆅ༊ࡼࡾᰩᖹᆅ༊ࡢ᪉ࡀ኱ࡁ࠸㸬࣭ ὶฟ≉ᛶ㸸ᰩᖹᆅ༊ࡢ᪉ࡀኳ↛ࢲ࣒ὶධ㔞ࡣ኱ࡁࡃ㸪㝆㞵࢖࣋ࣥࢺ┤๓ࡢ✵ࡁᐜ㔞ࡶᑠࡉ࠸ഴྥ࡜࡞ࡗ࡚࠸ࡿ㸬࣭ ₃Ỉ≉ᛶ㸸ᖺᖹᆒ㏱Ỉಀᩘ㸪ฟỈᮇᖹᆒኳ↛ࢲ࣒₃Ỉ㔞࡜ࡶ࡟ᰩᖹᆅ༊ࡢ᪉ࡀᑠࡉࡃ㸪₃Ỉࡋ࡟ࡃ࠸≧ἣ࡜࡞ࡗ࡚࠾ࡾ㸪ࡑࢀࢆ཯ᫎࡋ࡚ฟỈᮇᖹᆒࡢኳ↛ࢲ࣒✵ࡁᐜ㔞ࡶᰩᖹᆅ༊ࡣᑠࡉࡃ࡞ࡗ࡚࠸ࡓ㸬 㛗Ẋᆅ༊࡜ᰩᖹᆅ༊ࡢErmini and Casagli 13)ࡢDBIࡣྠ⛬ᗘࡢ್࡛࠶ࡾ㸪ุᐃᇶ‽࡛ࡣ࡝ࡕࡽࡶᏳᐃ࡟ศ㢮ࡉࢀࡿࡀ㸪ኳ↛ࢲ࣒ᙧᡂᚋ10ᖺ⤒㐣ࡋࡓ᫬Ⅼ࡛ࡣ㸪⤖ᯝⓗ࡟㉺ὶ౵㣗ࡢ≧ἣ࡟ࡣ኱ࡁ࡞㐪࠸ࡀ⏕ࡌ࡚࠸ࡿ㸬ẚ㍑ⓗ㏆
࠸఩⨨࡟࠶ࡿ㛗Ẋᆅ༊࡜ᰩᖹᆅ༊ࡢ2ࡘࡢኳ↛ࢲ࣒ࡶ㸪Ẽೃ≉ᛶࡸỈᩥ≉ᛶࢆ⪃៖ࡍࡿࡇ࡜࡛㸪ࡑࡢ㐪࠸ࢆᢕᥱࡍࡿࡇ࡜ࡀ࡛ࡁࡿ࡜⪃࠼ࡽࢀࡿ㸬ࡲࡓ㸪᪂つ࡟Ⓨ⏕ࡋࡓኳ↛ࢲ࣒ࡶẼೃ≉ᛶ್ࡸ࿘㎶ࡢỈᩥ≉ᛶ್ࢆ௬ᐃࡋ㸪ᮏ✏࡟♧ࡋࡓ2ࡘࡢኳ↛ࢲ࣒ࡢྛỈᩥㅖᩘ್࡜ẚ㍑ࡍࡿࡇ
࡜࡛㸪௒ᚋⓎ⏕ࡍࡿኳ↛ࢲ࣒ࡢ㉺ὶࡢࡋࡸࡍࡉࢆุ᩿ࡍ

― 11 ―  Ỉᒣ㧗ஂ㸪᳃ಇຬ㸪ᆏཱྀဴኵ㸪஭ୖබኵ㸸᪥ᮏࡢኳ↛ࢲࡿᮦᩱ࡜࡛ࡁࡿሙྜࡶ࠶ࢁ࠺㸬࣒࡜ᑐᛂ⟇㸪ྂ௒᭩㝔㸪 ኳ↛ࢲ࣒ᙧᡂᚋࡢᛂᛴᑐ⟇࡜ࡋ࡚ࡣ㸪௬᤼Ỉ㊰ࡸ᤼Ỉࢺࣥࢿࣝ࡜࠸ࡗࡓ㑅ᢥ⫥ࡀ࠶ࡿࡀ23),24)㸪ኳ↛ࢲ࣒ᙧᡂᚋ㸪   ⏣⏿ⱱΎ㸪Ỉᒣ㧗ஂ㸪஭ୖබኵ㸸ኳ↛ࢲ࣒࡜⅏ᐖ ྂ௒᭩㝔㸪
᪩ᮇ࡟Ỉᩥほ ࢆ㛤ጞࡋ㸪኱ࡁ࡞㝆㞵࢖࣋ࣥࢺࢆ⤒㦂ࡋ12) Casagli, N. and Ermini, L.㸸Geomorphic analysis of landslideࡓ᫬Ⅼ࡛㸪ᮏ✏࡛♧ࡋࡓࡼ࠺࡞Ỉ཰ᨭ࠿ࡽࡢኳ↛ࢲ࣒ὶ
dams in the Northern Apennine, Transactions Japaneseධ㔞ࢹ࣮ࢱ࡟ᇶ࡙ࡃࢱࣥࢡࣔࢹࣝ➼ࡢẚ㍑ⓗ⢭ᗘࡢ㧗࠸
Geomorphological Union, Vol.20, No.3, pp.219 - 249, 1999.
ὶฟゎᯒἲ࡜₃Ỉ≉ᛶࡸ᪤ᏑࡢẼ㇟ࢹ࣮ࢱ࡞࡝ࢆ⤌ࡳྜ13)  Ermini, L. and Casagli, N. 㸸Prediction of the behavior ofࢃࡏࡓࢩ࣑࣮ࣗࣞࢩࣙࣥࢆ⾜࠺ࡇ࡜࡛㸪ᑐ⟇ᕤࡢ᪉㔪ࡸ
landslide dams using a geomorphological dimensionless index,‣ỈụࡢỈ఩ࡢண ࡸ㉺ὶࡢྍ⬟ᛶࢆ᳨ウ࡛ࡁࡿࡶࡢ࡜
Earth Surface Process and Landforms, Vol.28, pp.31 - 47, 2003.
⪃࠼ࡽࢀࡿ㸬14) Korup, O.㸸Geomorphometric characteristics of New Zealandཧ⪃ᩥ⊩

landslide dams, Eng Geol, Vol.73, No.1-2, pp.13 ̽ 35, 2004.

  Ẽ㇟ᗇ ኳᖹᡂᖺྎ㢼➨ྕ࡟ࡼࡿ᭶᪥࠿ࡽ᭶᪥15) Dong, J. J., Tung, Y. H., Chen, C. C., Liao, J. J. and Pan, Y. W.㸸

࡟࠿ࡅ࡚ࡢ኱㞵࡜ᭀ㢼⅏ᐖ᫬Ẽ㇟㏿ሗ㸪

Logistic regression model for predicting the failure probability of a  ᯇᮧ࿴ᶞ㸪⸨⏣ṇ἞㸪ᒣ⏣Ꮥ㸪ᶒ⏣㇏㸪἟ᮏ᫴ஓ㸪ሐ኱୕㸪

landslide dam, Eng Geol, Vol.117, No.1-2, pp.52 ̽ 61, 2011.

୰㇂ຍዉ㸪௒Ἠᩥᑑ㸪ᓥ⏣ᚭ㸪ᾏᇼṇ༤㸪㕥ᮌᾈ஧㸪ᚨỌ༤㸪 16) Dong, J. J., Li, Y. S., Kuo, C. Y., Sung, R. T., Li, M. H., Lee, C.
᯽ཎె᫂㸪㛗㔝ⱥḟ㸪ᶓᒣಟ㸪㕥ᮌᣅ㑻㸪Ṋ⃝Ọ⣧㸪኱㔝ு

T., Chen, C. C. and Lee, W. R.㸸The formation and breach of a୍㸪㛗ᒣᏕᙪ㸪ụᓥ๛㸪ᅵᒇᬛ ᖺ᭶ྎ㢼ྕ࡟ࡼࡿ

short-lived landslide dam at Hsiaolin Village, Taiwan - part I:⣖ఀ༙ᓥ࡛Ⓨ⏕ࡋࡓᅵ◁⅏ᐖ ◁㜵Ꮫ఍ㄅ㸪9RO 㸪1R㸪

postevent reconstruction of dam geometry, Eng Geol, Vol.123,

SS

No.1-2, pp.40 – 59, 2011.

  ᅜᅵ஺㏻┬ᅜᅵᢏ⾡ᨻ⟇⥲ྜ◊✲ᡤ࣭⊂❧⾜ᨻἲேᅵᮌ◊  ༓ⴥᖿ㸪Ỉᒣ㧗ஂ㸸ኳ↛ࢲ࣒ࡢỈ఩ほ ࡟ࡼࡿ‶Ỉࡲ࡛✲ᡤ ᖹᡂᖺ ᖺ ⣖ఀ༙ᓥྎ㢼ྕᅵ◁⅏ᐖㄪᰝሗ࿌ࡢ㞵㔞᥎ᐃ᪉ἲ࡟ࡘ࠸࡚㸦ᖹᡂᖺྎ㢼ྕ࡟㛵ࡍࡿ

ᅜᅵ஺㏻┬ᅜᅵᢏ⾡ᨻ⟇⥲ྜ◊✲ᡤ࣭⊂❧⾜ᨻἲேᅵᮌ◊✲ᡤ

஦౛◊✲㸧㸪◁㜵Ꮫ఍ㄅ9RO1RSS  ᶓᒣಟ㸪ෆ⏣ኴ㑻㸪ᮌୗ⠜ᙪ Ỵቯࡲ࡛ࡢ⥅⥆᫬㛫࠿ࡽ  ᅜᅵ஺㏻┬㏆␥ᆅ᪉ᩚഛᒁ ᖺ⣖ఀ༙ᓥ኱Ỉᐖᅜᅵࡳࡓኳ↛ࢲ࣒ࡢศ㢮 ◁㜵Ꮫ఍ㄅ㸪9RO 㸪1R㸪SS

஺㏻┬㏆␥ᆅ᪉ᩚഛᒁ⅏ᐖᑐᛂࡢグ㘓 ᅜᅵ஺㏻┬㏆␥ᆅ᪉ᩚഛᒁ  ⛅ᒣ᛭Ꮚ㸪⸨ᮧ┤ᶞ㸪▼ሯᛅ⠊㸪ෆ⏣ኴ㑻㸪ᱜ஭ர㸪㓇  ᱜ஭ர㸪Ლཎಟ㸪኱ᒣㄔ㸪Ỉᒣ㧗ஂ㸪ụ⏣ᬡᙪ㸪すᑿ㝧௓㸪஭Ⰻ㸪ᾏཎⲮ୍㸪ྈ⇃඾Ꮚ㸸ኳ↛ࢲ࣒ࡢỈ఩ண ࡟₃Ỉ㔞ᚨỌ༤㸪ኴ⏣ᩗ୍㸪኱ሯᗣஅ ᖹᡂᖺ᭶ྎ㢼ྕ࡟ࡼࡿࡀ୚࠼ࡿᙳ㡪㸪◁㜵Ꮫ఍ㄅ9RO㸪1R㸪SS̾Ἑ㐨㛢ሰᑐ⟇᪋タࡢ⿕⅏࡟ࡘ࠸࡚㹼&&79 ⏬ീࢆ୰ᚰ࡜ࡋࡓ20) Kaihra, S., Tadakuma, N., Fujiwara, Y., Sakurai, W., Oyama, M.

౵㣗㐣⛬ࡢゎᯒ㹼 ◁㜵Ꮫ఍ㄅ㸪9RO㸪1R㸪SS

and Sakai, R.: Landslide dam hydrological observation andhydrological balance calculation procedures, Extended Abstracts of  ᱜ஭ர㸪㓇஭Ⰻ㸪ዟᒣᝆᮌ㸪Ỉᒣ㧗ஂ㸪ụ⏣ᬡᙪ㸪ᾏཎⲮthe INTERPRAEVENT 2014 in Pacific Rim, pp.140— 141 (2014).

୍㸪ྈ⇃඾Ꮚ㸪᯽ཎె᫂㸪ྜྷ㔝ᘯ♸㸪ᑠᕝෆⰋே㸪㱟ぢᰤ⮧㸪   ᮌୗ⠜ᙪ㸪ᰘ⏣ಇ㸪ᒣ㉺㝯㞝㸪୰㇂ὒ᫂㸪ᑠᕝෆⰋே㸪ᓥ⏣ᚭ ᖺ᭶ྎ㢼ྕ᫬࡟Ἑ㐨㛢ሰ࡛⏕ࡌࡓ౵㣗࣭ᅵᰘᓮ㐩ஓ㸪┾ᘪᏕஅ㸪㛗㇂ᕝ㝧୍㸪୕⏣ᮧ᐀ᶞ㸪ᯇ஭ಖ㸸◁ὶฟ࡜ᑐ⟇࡬ࡢᙳ㡪◁㜵Ꮫ఍ㄅ㸪9RO 㸪1R㸪SSᖺྎ㢼➨ྕ᫬ࡢ῝ᒙᔂቯ࡟క࠺ኳ↛ࢲ࣒ࢆᵓᡂࡍࡿ

ᒾ▼ࡢࢫ࣮ࣞ࢟ࣥࢢヨ㦂⤖ᯝ࡜⣙ᖺ㛫ࡢኳ↛ࢲ࣒ࡢᏳᐃᛶ࡜ࡢ㛵ಀ࡟ࡘ࠸࡚ ᆅࡍ࡭ࡾᏛ఍ㄅ 9RO㸪1R

7) Costa, J.E. and Schuster, R.L.㸸The formation and failure of naturalSS

dams, Geological Society of America Bulletin, Vol.100, pp.1054 -  ᮌୗ⠜ᙪ㸪໭ᮏᴦ㸪ᒣ㉺㝯㞝㸪୰㇂ὒ᫂㸪ᾏཎⲮ୍㸪Ⲩ

1068 1988.
  ෆ⏣ኴ㑻㸪ᯇᒸᬡ㸪ᯇᮏ┤ᶞ㸪ᯇ⏣ዴỈ㸪⛅ᒣᾈ୍㸪⏣ᮧᮌ⩏๎㸸ᖺ⣖ఀ༙ᓥ኱Ỉᐖ࡛῝ᒙᔂቯ࡟ࡼࡾⓎ⏕ࡋࡓᆂྖ㸪୍ᡞḠஓ ኳ↛ࢲ࣒ࡢ㉺ὶ౵㣗ࡢᐇែ㸸ᐑᇛ┴୕㏕ᕝἙ㐨㛢ሰ⟠ᡤࡢ┘ど࣭ほ ᡭἲ㸪⎔ቃࢩࢫࢸ࣒ィ ไᚚᏛ఍ㄅ㸪9RO㸪1R㸪SS἟಴⿬ἑᆅ༊ࡢ஦౛◁㜵Ꮫ఍ㄅ㸪9RO1RSS  ᳃ಇຬ㸸ᅜෆእ࡛᥇⏝ࡉࢀࡓኳ↛ࢲ࣒⥭ᛴᑐ⟇ᕤἲ

9RO1RSS  ຍ⸨ᖾ⏨㸪ᐑ㔝㈗㸪Ỉᒣ㧗ஂ ኳ↛ࢲ࣒ࡢ㉺ὶ౵㣗ࡢᐇែ㸸Ⱎᕝὶᇦ࡟࠾ࡅࡿᑠつᶍ࡞Ἑ㐨㛢ሰ ኳ↛ࢲ࣒ ࡢỴቯ  ᱜ஭ர㸸኱つᶍἙ㐨㛢ሰࡢ⥭ᛴᕤ஦ࡢ⪃࠼᪉࡟ࡘ࠸࡚㸪ࠝ㏿ሗࠞ◁㜵Ꮫ఍ㄅ㸪9RO1RSS

◁㜵Ꮫ఍ㄅ9RO1RSS
㸦 ཷ௜㸧


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