1) 2) 3) 3) Field Investigation for Reduction Effect of Heat-Island Phenomena by Urban River Morihiro HARADA 1) Takehiro TEJIMA 2) Kensuke OKUYAMA 3)

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Field Investigation for Reduction Effect of Heat-Island Phenomena by Urban River

Morihiro HARADA

1)

Takehiro TEJIMA

2)

Kensuke OKUYAMA

3)

and Tomoyuki TAKAGI

3)

Abstract

Taking the Horikawa as an objective river of research, various field investigations were carried out to quantify reduction effects of the heat-island phenomena by existence of waters in an urban area. The latent heat flux and its temporary change was evaluated based on observation of the evaporation rate from the river. Through the meteorological measurements at several points in a riverside park, spatial tendency of comfort indices was found from the river to the surround area.

1. ࡣࡌࡵ࡟ ㏆ᖺ㸪ᆅ⌫ࡢ ᬮ໬࡟ຍ࠼㸪㒔ᕷ໬ࡢ㐍ᒎࡸ⏕άᵝᘧ ࡢ㏆௦໬࡟కࡗ࡚㸪ᬬ⇕⎔ቃࡢᣑ኱ࡍ࡞ࢃࡕࠕࣄ࣮ࢺ࢔ ࢖ࣛࣥࢻ⌧㇟ࠖࡀ῝้໬ࡋ࡚࠸ࡿ㸬࡜ࡾࢃࡅ2007 ᖺኟࡣ ඲ᅜⓗ࡟㓞ᬬ࡟ぢ⯙ࢃࢀ㸪ྛᆅ࡛᭱㧗Ẽ ࡢグ㘓ࢆሬࡾ ᭰࠼ࡓࡇ࡜ࡣグ᠈࡟᪂ࡋ࠸㸬ࡇ࠺ࡋࡓ≧ἣࢆᨵၿࡋࡼ࠺ ࡜㸪ឡ▱୓༤㸦2005 ᖺ㸧ࡸ඲ᅜࡢ୺せ㒔ᕷ࡛͆ᡴࡕỈ኱ సᡓ͇࡜㖭ᡴࡗࡓ࢖࣋ࣥࢺࡀᐇ᪋ࡉࢀ࡚࠸ࡿࡀ㸪௒ࡢ࡜ ࡇࢁ୍㐣ᛶࡢၨⵚ⾜஦ࡢᇦࢆฟ࡚࠸࡞࠸㸬 㒔ᕷࡢᬬ⇕⎔ቃࢆゎᾘࡍࡿ᪋⟇࡜ࡋ࡚㸪⎔ቃ┬ࡸྛ⮬ ἞య࡛ࡣ⥳ᆅࡸỈᇦࡢಖ඲ࢆᥦ᱌ࡋ࡚࠸ࡿ㸬☜࠿࡟ᯘᆅ ࡸ㎰ᆅࡣ㸪ᕷ⾤ᆅ࡟ẚ࡭Ẽ ࡢୖ᪼ࢆᢚ࠼ࡿຠᯝࢆࡶࡕ㸪 㒔ᕷෆ࡟ᏑᅾࡍࡿἙᕝࡸụ἟ࡶ㸪Ỉ㠃࠿ࡽࡢ⵨Ⓨ࡟క࠺ ₯⇕㸦Ẽ໬⇕㸧ࡸỈሢ⮬㌟ࡢ㈓⇕ຠᯝ࡟ࡼࡾ㸪Ẽೃኚ໬ ࡢ⦆࿴࡟᭷ຠ࡞ᙺ๭ࢆᯝࡓࡋ࡚࠸ࡿ࡜⪃࠼ࡽࢀࡿ㸬࡜ࡃ ࡟㸪㡑ᅜ࣭ࢯ࢘ࣝᕷ࡟࠾ࡅࡿΎ῱ᕝࡢ᚟ඖ࡟ࡼࡿẼ ୖ ᪼ࡢᢚไຠᯝࡣ᭷ྡ࡛࠶ࡿ㸬ྡྂᒇᕷ࡟࠾࠸࡚ࡶ㸪ᇼᕝ ࡸ᪂ᇼᕝ࣭୰ᕝ㐠Ἑ࡞࡝ࡢᕷෆἙᕝ࡟ࡼࡗ࡚㸪ኟᏘࡢẼ  ୖ᪼ࡀᢚ࠼ࡽࢀ࡚࠸ࡿࡇ࡜ࡀண᝿ࡉࢀࡿ㸬 ࡇࡇ࡛ၥ㢟࡜࡞ࡿࡢࡣ㸪ࡑ࠺ࡋࡓ⥳ᆅࡸỈᇦࡢࡶࡘᬬ ⇕⎔ቃࡢ⦆࿴ຠᯝࢆ࡝ࡢࡼ࠺࡟ホ౯ࡍࡿ࠿࡛࠶ࡿ㸬ᮏ◊ ✲ࡣ㸪ྡྂᒇᆅᇦ࡟࠾ࡅࡿࣄ࣮ࢺ࢔࢖ࣛࣥࢻ⌧㇟ࡢ㐍⾜ ≧ἣࢆࡲ࡜ࡵࡿ࡜࡜ࡶ࡟㸪ᇼᕝࢆ౛࡟࡜ࡗ࡚㸪Ỉ㠃࠿ࡽ ࡢ⵨Ⓨ㔞ࡢ ᐃ࡞ࡽࡧ࡟Ἑᕝ࿘㎶ᇦ࡟࠾ࡅࡿᚤẼ㇟ࡢほ  ࢆ⾜࠺ࡇ࡜࡟ࡼࡾ㸪Ἑᕝࡢࡶࡘᬬ⇕⎔ቃࡢ⦆࿴ຠᯝࢆ ᫂ࡽ࠿࡟ࡋ㸪ࣄ࣮ࢺ࢔࢖ࣛࣥࢻ⌧㇟ࡢᑐ⟇ࢆ⪃࠼ࡿᇶ♏ ㈨ᩱࢆᚓࡼ࠺࡜ࡍࡿࡶࡢ࡛࠶ࡿ㸬 2. ྡྂᒇᆅᇦ࡟࠾ࡅࡿࣄ࣮ࢺ࢔࢖ࣛࣥࢻ⌧㇟ࡢ㐍ᒎ 2.1 㒔ᕷࡢࣄ࣮ࢺ࢔࢖ࣛࣥࢻ⌧㇟࡜ࡑࡢせᅉ ࣄ࣮ࢺ࢔࢖ࣛࣥࢻ⌧㇟࡜ࡣ㸪ኟᏘ࡟࠾࠸࡚㒔ᕷ㒊ࡢẼ  ࡀ㑹እ࡟ẚ࡭࡚ᓥ≧࡟㧗ࡃ࡞ࡿ⌧㇟࡛㸪㒔ᕷ໬࡟క࠺ ⎔ቃࡢᨵኚ࡟ࡼࡗ࡚ᘬࡁ㉳ࡇࡉࢀࡿ኱Ẽࡢ⇕ởᰁ࡛࠶ࡿ㸬 ࡑࡢཎᅉ࡜ࡋ࡚ࡣ㸪Fig.1 ࡟ᶍᘧⓗ࡟♧ࡍࡼ࠺࡟㸪ձ⥳ᆅ ࡸỈ㠃ᇦࡢ႙ኻ࡟క࠺⵨Ⓨ₯⇕ࡢῶᑡ㸪ղᏯᆅ໬ࡸ㐨㊰ ⯒⿦࡜࠸ࡗࡓ⮬↛ᆅ┙ࡢேᕤ⿕そ໬࡟ࡼࡿᨺᑕ⇕࣭㢧⇕ ࡢቑຍ㸪ճ࢚࢔ࢥ࣭ࣥ⮬ື㌴➼࠿ࡽࡢேᕤ᤼⇕࡟ࡼࡿ㢧 ⇕ࡢቑຍ㸪մᘓ≀࡟ࡼࡿᆅᙧࡢพฝࡀቑࡍࡇ࡜࡟ࡼࡿᙅ 㢼ᇦࡢᙧᡂ➼ࡀᣦ᦬ࡉࢀ࡚࠸ࡿ1)㸬ࣄ࣮ࢺ࢔࢖ࣛࣥࢻ⌧ ㇟ࡣ༢࡟ኟᏘࡢ⏕άࡀ㐣ࡈࡋ࡟ࡃ࠸ࡔࡅ࡛࡞ࡃ㸪⇕୰⑕ ࡞࡝೺ᗣ࡬ࡢᝏᙳ㡪ࡸ㸪෭ᡣࢆᙉ໬ࡍࡿࡇ࡜࡟ࡼࡿ஧㓟 ໬Ⅳ⣲᤼ฟ㔞ࡢࡉࡽ࡞ࡿቑຍࢆࡶᘬࡁ㉳ࡇࡍࡇ࡜࠿ࡽ㸪 ྍ⬟࡞㝈ࡾ⦆࿴ࡍࡿດຊࡀồࡵࡽࢀ࡚࠸ࡿ㸬 1) ᘓタࢩࢫࢸ࣒ᕤᏛ⛉ 2) ኱Ꮫ㝔⌮ᕤᏛ◊✲⛉ಟኈㄢ⛬ᘓタࢩࢫࢸ࣒ᕤᏛᑓᨷ 3) ᘓタࢩࢫࢸ࣒ᕤᏛ⛉ 4 ᖺ 1) Department of Civil Engineering 2) Master Course of Civil Engineering 3) Student of Civil Engineering

Ꮿᆅ໬䜔 㐨㊰⯒⿦ ⮬↛ᆅ┙䛾 ேᕤ⿕そ໬ 㢧⇕䛾ቑຍ ⥳ᆅ䛾႙ኻ Ỉ㠃䛾ᾘኻ ₯⇕䛾ῶᑡ ⵨Ⓨᩓ䛾ῶᑡ ᕤሙ䞉䜶䜰䝁䞁 ⮬ື㌴䛾ቑຍ ᘓ≀䛻䜘䜛 ᆅᙧ䛾พฝ໬ ᙅ㢼ᇦ䛾ᙧᡂ ேᕤ᤼⇕䛾ቑຍ 㒔ᕷᇦ䛾ᬬ⇕⎔ቃ䛾ᙧᡂ ⇕䛾೵䞉྿⁀䜚 ⵳⇕䞉஘཯ᑕ䛾ቑຍ ᨺᑕ⇕䛾ቑຍ ᳃ᯘ䛾ఆ᥇ ㎰ᆅ䛾㌿⏝ Ỉᇦ䛾ᇙ❧䛶 Ꮿᆅ໬䜔 㐨㊰⯒⿦ ⮬↛ᆅ┙䛾 ேᕤ⿕そ໬ 㢧⇕䛾ቑຍ ⥳ᆅ䛾႙ኻ Ỉ㠃䛾ᾘኻ ₯⇕䛾ῶᑡ ⵨Ⓨᩓ䛾ῶᑡ ᕤሙ䞉䜶䜰䝁䞁 ⮬ື㌴䛾ቑຍ ᘓ≀䛻䜘䜛 ᆅᙧ䛾พฝ໬ ᙅ㢼ᇦ䛾ᙧᡂ ேᕤ᤼⇕䛾ቑຍ 㒔ᕷᇦ䛾ᬬ⇕⎔ቃ䛾ᙧᡂ ⇕䛾೵䞉྿⁀䜚 ⵳⇕䞉஘཯ᑕ䛾ቑຍ ᨺᑕ⇕䛾ቑຍ ᳃ᯘ䛾ఆ᥇ ㎰ᆅ䛾㌿⏝ Ỉᇦ䛾ᇙ❧䛶 Fig. 1 ࣄ࣮ࢺ࢔࢖ࣛࣥࢻ⌧㇟ࡢせᅉ࡜࣓࢝ࢽࢬ࣒㸦ཎ⏣㸧

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2.2 ྡྂᒇᆅᇦ࡟࠾ࡅࡿ㏆ᖺࡢẼೃኚ໬  Fig. 2 ࡣ㸪ྡྂᒇ࡜῿⨾༙ᓥඛ➃ࡢఀⰋ†࡟࠾ࡅࡿ 8 ᭶ࡢᖹᆒẼ ࢆ㸪1966 ᖺ࠿ࡽ 2007 ᖺࡲ࡛ 42 ᖺ㛫ࡢ࢔࣓ ࢲࢫࢹ࣮ࢱ࠿ࡽᥥ࠸ࡓࡶࡢ࡛࠶ࡿ㸬ᅗ࡟࠾࠸࡚୧⪅ࢆẚ ㍑ࡍࡿ࡜㸪1975 ᖺ㡭ࡲ࡛ࡣ࡯ࡰྠ୍ࡢ್ࢆ♧ࡋ࡚࠸ࡓࡢ ࡟ᑐࡋ㸪㏆ᖺࡣᚎࠎ࡟ᕪࡀ㛤ࡁጞࡵ㸪᭱㏆࡛ࡣྡྂᒇࡢ ᪉ࡀఀⰋ†ࡼࡾࡶ㸯Υ௨ୖ㧗ࡃ࡞ࡗ࡚ࡁ࡚࠸ࡿࡇ࡜ࡀศ ࠿ࡿ㸬ࡲࡓ㸪Fig.3 ࡣྠࡌࡃ࢔࣓ࢲࢫࢹ࣮ࢱ࡟ᇶ࡙ࡁ㸪ྡ ྂᒇᆅᇦ࡟࠾࠸࡚7 ᭶㹼9 ᭶࡟Ẽ ࡀ 30Υࢆ㉸࠼ࡓᘏ࡭ ᫬㛫ࡢศᕸࢆ1981 ᖺ࡜1998 ᖺ࡛ẚ㍑ࡋࡓࡶࡢ࡛࠶ࡿ1)㸬 1981 ᖺ࡟ࡣᒱ㜧ࡸከ἞ぢ࡜࠸ࡗࡓ┅ᆅ࡛㧗 ࡢᆅⅬࡀ ぢࡽࢀࡿ⛬ᗘ࡛࠶ࡗࡓࡢ࡟ᑐࡋ㸪1998 ᖺ࡟ࡣ⃰ᑿᖹ㔝඲ ᇦ࡛㧗 ໬ࡋ࡚࠸ࡿࡇ࡜ࡀศ࠿ࡿ㸬࡜ࡃ࡟ྡྂᒇ࡛ࡣ㸪 30Υ㉸ࡢᘏ࡭᫬㛫ࡀ 227 ᫬㛫࠿ࡽ 2 ಸࡢ 434 ᫬㛫࡟ቑຍ ࡋ࡚࠾ࡾ㸪ᬬ⇕໬ࡀ㢧ⴭ࡟࡞ࡗ࡚ࡁ࡚࠸ࡿ㸬 2.3 ྡྂᒇᆅᇦࡢࣄ࣮ࢺ࢔࢖ࣛࣥࢻ⌧㇟ࡢཎᅉ 㒔ᕷࡢᬬ⇕໬ࡢཎᅉ࡜ࡋ࡚ࡣ㸪๓㏙ࡢࡼ࠺࡟ᅵᆅ฼⏝ ࡢኚ໬࡜ேᕤ᤼⇕㔞ࡢቑ኱ࡀᣲࡆࡽࢀࡿ㸬Fig. 4 ࡣྡྂᒇ ᕷ࡟࠾ࡅࡿ⥳࡟そࢃࢀࡓᆅᇦࡢศᕸࢆ⾲ࢃࡋ࡚࠸ࡿ2)㸬 ᡓᚋ㸪ᕷෆࡢᗈ࠸⠊ᅖ࡟ศᕸࡋ࡚࠸ࡓ⥳ᆅࡸ㎰ᆅࡣࡇࡢ ༙ୡ⣖ࡢ㛫࡟ᛴῶࡋ㸪໭ᮾ㒊ࡢ୍㒊ࢆ㝖࠸࡚࡯ࡰ඲ᇦࡀ ᕷ⾤ᆅ໬ࡋ࡚ࡁࡓ㸬Ỉᇦ࡟ࡘ࠸࡚ࡣ㸪ከࡃࡢᕷෆἙᕝࡀ ᬯῺ໬ࡉࢀࡿ୍᪉࡛㸪ࡓࡵụࡶ┦ᙜᩘࡀᇙࡵ❧࡚ࡽࢀ㸪 ࡑࡢᩘࡣFig. 5 ࡢࡼ࠺࡟ῶᑡࡋ࡚࠸ࡿ㸬 ୍᪉㸪ேᕤⓗ࡞᤼⇕㔞࡟ࡘ࠸࡚ࡣ㸪ྡྂᒇᕷෆ࠾ࡼࡧ ࿘㎶ᆅᇦ࡟࠾ࡅࡿ㐨㊰⥙ࡢᩚഛ࡟కࡗ࡚⮬ື㌴஺㏻ࡢቑ ຍࡢ࡯࠿㸪࢚࢔ࢥࣥࢆഛ࠼ࡓఫᏯࡀFig. 6 ࡢࡼ࠺࡟ᛴቑ ࡋ㸪ࡇࡢ㛫࡟ᕷẸࡢ⏕άᵝᘧࡀ኱ࡁࡃኚ໬ࡋࡓࡇ࡜ࡀఛ ࢃࢀࡿ㸬ࡇࢀࡽࡢኚ໬ࡀ㸪๓㏙ࡋࡓ㒔ᕷࡢᬬ⇕໬ࢆᘬࡁ ㉳ࡇࡍせᅉ࡜࡞ࡗ࡚࠸ࡿࡇ࡜ࡣ␲࠸࡞࠸㸬 ࡇ࠺ࡋࡓࣄ࣮ࢺ࢔࢖ࣛࣥࢻ⌧㇟ࢆ⦆࿴ࡍࡿࡓࡵ࡟㸪ྡ ྂᒇᕷ࡛ࡣ⥳ᆅࡸỈᇦࡢಖ඲ࡸ᪂ࡓ࡞ᩚഛࢆ᳨ウࡋ࡚࠾ ࡾ2)㸪ᕷẸᅋయ࠿ࡽࡶ㒔ᚰ࡟⥳ᆅᖏࡸ͆ࡏࡏࡽࡂỈ㊰͇ ࢆタࡅࡿࡇ࡜࡛ࣄ࣮ࢺ࢔࢖ࣛࣥࢻ⌧㇟ࢆ⦆࿴ࡍࡿ⾤࡙ࡃ Fig. 4 ྡྂᒇᕷ࡟࠾ࡅࡿ⥳⿕ᆅࡢ᥎⛣2) 㻞㻣㻤 㻝㻣㻤 㻝㻝㻞 㻥㻞 㻢㻡 㻞㻟 㻤㻞 㻤㻟 㻤㻝 㻣㻥 㻤㻝 㻥㻟 㻜 㻡㻜 㻝㻜㻜 㻝㻡㻜 㻞㻜㻜 㻞㻡㻜 㻟㻜㻜 㻟㻡㻜 㻠㻜㻜 㻝㻥㻢㻡 㻝㻥㻣㻝 㻝㻥㻣㻣 㻝㻥㻤㻞 㻝㻥㻤㻣 ⌧ᅾ 䛯 䜑 ụ ᩘ බ᭷ụ Ẹ᭷ụ Fig. 5 ྡྂᒇᕷෆࡢࡓࡵụࡢ᥎⛣ 㸦➨2 ᅇ࡞ࡈࡸỈࡢ⎔ ࢃ ᚟ά᥎㐍༠㆟఍㈨ᩱࡼࡾసᡂ㸧 㻜 㻝㻜 㻞㻜 㻟㻜 㻠㻜 㻡㻜 㻢㻜 㻣㻜 㻤㻜 㻥㻜 㻝㻥㻢㻢 㻝㻥㻣㻜 㻝㻥㻣㻠 㻝㻥㻣㻤 㻝㻥㻤㻞 㻝㻥㻤㻢 㻝㻥㻥㻜 㻝㻥㻥㻠 㻝㻥㻥㻤 㻞㻜㻜㻞 㻞㻜㻜㻢 ୡᖏᩘ䚷㼇㽢㻝㻜 㻠㼉 Fig. 6 ྡྂᒇᕷ࡟࠾ࡅࡿ࢚࢔ࢥࣥࢆᡤᣢࡍࡿୡᖏᩘࡢ᥎⛣ 㸦ྡྂᒇᕷ⥲ົᒁ㈨ᩱ࠾ࡼࡧ⎔ቃ┬⤫ィ㞟࡟ࡼࡾసᡂ㸧 㻞㻠 㻞㻡 㻞㻢 㻞㻣 㻞㻤 㻞㻥 㻟㻜 㻟㻝 㻝㻥㻢㻢 㻝㻥㻣㻜 㻝㻥㻣㻠 㻝㻥㻣㻤 㻝㻥㻤㻞 㻝㻥㻤㻢 㻝㻥㻥㻜 㻝㻥㻥㻠 㻝㻥㻥㻤 㻞㻜㻜㻞 㻞㻜㻜㻢 䠔 ᭶ 䛾 ᖹ ᆒ Ẽ   㻌䠄 䉝 䠅 ྡྂᒇ ఀⰋ† Fig. 2 ྡྂᒇ࡜ఀⰋ†࡟࠾ࡅࡿ 8 ᭶ᖹᆒẼ ࡢ⤒ᖺኚ໬ Fig. 3 ྡྂᒇᆅᇦ࡟࠾ࡅࡿẼ  30Υ㉸ᘏ࡭᫬㛫ࡢศᕸ1)

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ࡾࡀᥦゝࡉࢀ࡚࠸ࡿ 㸬ࡑ࠺ࡋࡓලయⓗ࡞᪋⟇ࢆ᳨ウࡍ ࡿ࡟ᙜࡗ࡚㸪ࡑࢀ࡟ࡼࡿຠᯝࢆᐃ㔞ⓗ࡟ホ౯ࡍࡿࡇ࡜ࡀ ᚲせ࡜࡞ࡿࡀ㸪ᐇ㝿⌧㇟࡟ᑐࡍࡿほ ㈨ᩱࡀ༑ศ࡛࡞ࡃ㸪 ᳨ウࡢ㞀ᐖ࡜࡞ࡗ࡚࠸ࡿ㸬௨ୗ࡛ࡣ㸪ྡྂᒇᕷෆࢆὶࢀ ࡿᇼᕝࢆ౛࡟࡜ࡗ࡚㸪Ỉᇦࡀࡶࡘ࿘㎶ᆅᇦ࡬ࡢẼೃ⦆࿴ ຠᯝ࡟ࡘ࠸࡚㸪ᐇ ࡋࡓ⤖ᯝࢆሗ࿌ࡍࡿ㸬 3. ᇼᕝ࡟࠾ࡅࡿỈ㠃⵨Ⓨ㔞ࡢ ᐃ ᇼᕝࡣỤᡞ᫬௦࡟㛤๐ࡉࢀࡓỈ㊰ࢆ㉳※࡜ࡋ㸪ྡྂᒇ ᕷࡢ㒔ᚰ㒊ࢆ༡໭࡟㈏࠸࡚ྡྂᒇ ࡟ὀࡄὶ㊰㛗 16.2 km ࡢ㒔ᕷἙᕝ࡛࠶ࡿ㸦Fig. 7 ཧ↷㸧㸬ᕝᖜࡣୖὶ࡛ࡣ 20m ⛬ᗘ࡛࠶ࡿࡀ㸪ୗὶᇦ࡛ࡣ100m ㏆ࡃ࡟ᗈࡀࡾ㸪Ỉ㎶ࡢ ஈࡋ࠸ྡྂᒇ࡟࠾࠸࡚㈗㔜࡞Ỉᇦ࡜࡞ࡗ࡚࠸ࡿ㸬ᮏ◊✲ ࡛ࡣᇼᕝࡢ୰ὶᇦࢆᑐ㇟࡜ࡋ࡚㸪  ἙᕝỈ ࡢὶୗ᪉ྥ ศᕸ㸪  Ỉ㠃⵨Ⓨ㔞ࡢ᫬㛫ኚ໬㸪  Ἑᕝࡀ࿘㎶ᆅᇦࡢ ᚤẼ㇟࡟ཬࡰࡍᙳ㡪㸪ࡢ3 Ⅼ࡟ࡘ࠸࡚⌧ᆅほ ࢆ⾜ࡗࡓ㸬 3.1 ᇼᕝࡢỈ ࡢὶୗ᪉ྥศᕸ ᇼᕝࡢࡶࡘࣄ࣮ࢺ࢔࢖ࣛࣥࢻ⌧㇟ࡢ⦆࿴ຠᯝࢆ⪃࠼ ࡿ࡟ඛ❧ࡕ㸪ᇼᕝࡢỈ ࡀ࡝ࡢࡼ࠺࡟ศᕸࡋ࡚࠸ࡿ࠿㸪 㐟ぴ⯪ࢆ฼⏝ࡋ࡚⯪ୖ࠿ࡽ ᐃࡋࡓ㸬ほ ࡣ 2007 ᖺ 8 ᭶12 ᪥㸪኱₻ࡢᖸ₻᫬࡟ᐇ᪋ࡋࡓ㸬Fig. 8 ࡟ ᐃ⤖ᯝࢆ ♧ࡍ㸬ᐑࡢΏࡋ㸦⇕⏣༊㸧࡛஌⯪ࡋ⣡ᒇᶫ㸦୰༊㸧࡛ୗ ⯪ࡍࡿࡲ࡛74 ศࡀ⤒㐣ࡋ࡚࠸࡚ྠ᫬้ࡢほ ࡜ࡣ࠸࠼ ࡞࠸ࡀ㸪ᇼᕝࡢ⾲ᒙỈ ࡣ29㹼30Υ࡛Ᏻᐃࡋ࡚࠾ࡾ㸪ሙ ᡤⓗ࡞౫Ꮡᛶࡣㄆࡵࡽࢀ࡞࠸㸬Ẽ ࡜ࡢ㛵ಀࢆぢࡿ࡜㸪 Ẽ ࡀ 3Υవࡾୖ᪼ࡋ࡚࠸ࡿࡢ࡟ᑐࡋ㸪Ỉ ࡢୖ᪼ࡣ⦆ ࡸ࠿࡛࠶ࡿ㸬ྠᵝ࡞⯪ୖㄪᰝࢆ2006 ᖺ 9 ᭶ 24 ᪥࡟ࡶ⾜ ࡞ࡗ࡚࠸ࡿࡀ㸪Ỉ ࡀ඲యⓗ࡟3㹼4Υప࠸ࡶࡢࡢ㸪㢮ఝ ࡢ⤖ᯝ࡛࠶ࡗࡓ㸬ࡇࢀࡽࡢࡇ࡜࠿ࡽ㸪ᇼᕝࡢ୰ୗὶᇦࡢ ⾲ᒙỈ ࡣሙᡤⓗ࡟ࡣ࡯ࡰ୍ᵝ࡛㸪Ἑᕝ඲య࡜ࡋ࡚㸪⦆ ࡸ࠿࡞᫬㛫ⓗኚ໬ࢆࡋ࡚࠸ࡿ࡜⪃࠼ࡿࡇ࡜ࡀ࡛ࡁࡿ㸬 3.2 ᇼᕝ࡟࠾ࡅࡿỈ㠃⵨Ⓨ㔞ࡢィ  ἙᕝࡢᬯῺ໬ࡸụ἟ࡢᇙ❧࡚ࡣ㸪Ỉ㠃࠿ࡽࡢ⵨Ⓨࢆῶ ᑡࡉࡏ㸪㒔ᕷࡢᬬ⇕໬ࡢཎᅉ࡜࡞ࡿ㸬ࡋࡓࡀࡗ࡚㸪ࣄ࣮ ࢺ࢔࢖ࣛࣥࢻ⌧㇟ࢆ⦆࿴ࡍࡿ࡟ࡣ㸪ࡲࡎ᪤ᏑࡢỈᇦࡢಖ ඲ࡍࡿࡇ࡜ࡀồࡵࡽࢀࡿ㸬ྜྷ⏣࣭࿴ஂ㸦2007㸧ࡣ㸪ᇼᕝ ࡀࡶࡘࣄ࣮ࢺ࢔࢖ࣛࣥࢻ⌧㇟ࡢ⦆࿴ຠᯝ࡟ࡘ࠸࡚㸪⇕཰ ᨭࡢほⅬ࠿ࡽィ⟬࡟ࡼࡗ࡚ホ౯ࡍࡿඛ㥑ⓗ࡞◊✲ࢆ⾜ࡗ ࡓ5)㸬ࡇࡢᡂᯝࢆ᳨ドࡋ࡚௒ᚋࡢ᳨ウ࡟ά࠿ࡍࡓࡵ࡟ࡣ㸪 ᐇ㝿࡟ᇼᕝ࡛ ᐃࡉࢀࡓྛ✀ࡢほ ࢹ࣮ࢱࡀ୙ྍḞ࡛࠶ ࡿ㸬ࡑࡇ࡛➹⪅ࡽࡣ㸪ᇼᕝ୰ὶᇦࢆᑐ㇟࡜ࡋ࡚Ỉ㠃⵨Ⓨ 㔞࡟ᐇ ࢆヨࡳ㸪ࡑࡢ⤖ᯝࢆࡶ࡜࡟ᇼᕝ඲ᇦ࠿ࡽࡢỈ㠃 ⵨Ⓨ㔞࡜₯⇕ࣇࣛࢵࢡࢫࢆồࡵࡿࡇ࡜࡟ࡋࡓ㸬  Ỉ㠃⵨Ⓨ㔞ࡢィ ᪉ἲ ๓⠇ࡢ⤖ᯝ࠿ࡽ㸪ᇼᕝࡢỈ ࡣሙᡤⓗ࡟୍ᵝ࡛࠶ࡿࡇ ࡜࠿ࡽ㸪ほ ࡣ㸪Fig. 7 ࡟♧ࡍᚚ㝠ᶫ㸦Ἑཱྀ࠿ࡽ 4.4km㸧 ௜㏆࡛⾜ࡗࡓ㸬⌧ᆅ࡛ᐇ᪋ࡋࡓỈ㠃⵨Ⓨ㔞ࡢ ᐃ᪉ἲࢆ Fig. 7 ྡྂᒇᕷෆࢆὶࢀࡿᇼᕝ࡜௒ᅇࡢほ ༊ᇦ 㻞㻤 㻞㻥 㻟㻜 㻟㻝 㻟㻞 㻟㻟 㻟㻠 㻟㻡 㻟㻢 㻟㻚㻜 㻟㻚㻡 㻠㻚㻜 㻠㻚㻡 㻡㻚㻜 㻡㻚㻡 㻢㻚㻜 㻢㻚㻡 㻣㻚㻜 㻣㻚㻡 㻤㻚㻜 㻤㻚㻡 㻥㻚㻜 Ἑཱྀ䛛䜙䛾㊥㞳㻌䠄㼗㼙䠅   㻌ᗘ 㻌䠄 䉝 䠅 Ẽ 㻌䠄䉝䠅 Ỉ 㻌䠄䝨䝑䝔䞁䝁䞊䝦䝹 ᗘィ䠈䉝䠅 Ỉ 㻌䠄 ᗘ䝉䞁䝃䞊㼀㻾㻙㻣㻝㼁䠈䉝䠅 ኱ ℩ Ꮚ ᶫ ⓑ 㫽 ᶫ ⇕ ⏣ グ ᛕ ᶫ ⎼ ᒇ ᶫ ఫ ྜྷ ᶫ ᑿ 㢌 ᶫ ྂ Ώ ᶫ ᒣ ⋤ ᶫ ᯇ 㔜 ᶫ ᪥ ⨨ ᶫ ᒾ ஭ ᶫ ᪂ Ὢ ᓮ ᶫ ⣡ ᒇ ᶫ ᐑ 䛾 Ώ 䛧 Fig. 8 ᇼᕝࡢ୰ୗὶᇦ࡟࠾ࡅࡿ⾲ᒙỈ ࡢศᕸ 㸦 ᐃ᪥᫬㸸2007 ᖺ 8 ᭶ 12 ᪥ 10:40㹼11:54㸧  ⵨Ⓨ㔞ほ   ᚤẼ㇟ほ  ᚚ㝠ᶫ ᐑࡢΏࡋ

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Fig. 9 ࡟㸪౑⏝ࡋࡓ ᐃჾලࢆ Photo 1 ࡟♧ࡍ㸬ᇼᕝࡣឤ ₻Ἑᕝ࡛࠶ࡾ㸪₻ộ࡟ࡼࡾ᭱኱⣙2 m ࡢỈ఩ኚືࡀ⏕ࡌ ࡚࠸ࡿ㸬ࡑࡇ࡛㸪ᾋయᐜჾࢆㆤᓊ࠿ࡽỈ㠃࡟ᾋ࠿࡭㸪୍ ᐃ᫬㛫ࡈ࡜࡟ྞୖࡆ࡚㸪⵨Ⓨ࡟క࠺ᐜჾෆࡢỈ㔞ኚ໬ࢆ 㟁Ꮚኳ⛗࡟ࡼࡗ࡚ ᐃࡍࡿࡇ࡜࡜ࡋࡓ㸬ᐜჾෆࡢỈ ࡣ ἙᕝỈ ࡜୍⮴ࡋ࡚࠸ࡿᚲせࡀ࠶ࡿࡓࡵ㸪኱Ꮫᵓෆ࡛ண ഛᐇ㦂ࢆ⧞㏉ࡋ࡚ᐜჾࡢ〇స࡜ᨵⰋࢆ⾜ࡗࡓ㸬࡞࠾㸪Ỉ   ᐃ࡟ࡣ ᗘィ ࣮ࣟ࢞TR-71U ࢆ౑⏝ࡋࡓ㸬  ᇼᕝ࡟࠾ࡅࡿỈ㠃⵨Ⓨ㔞ࡢほ ⤖ᯝ ⵨Ⓨ㔞ࡢほ ࡣFig. 11 ࡟♧ࡍᇼᕝ୰ὶᇦ࡛ᐇ᪋ࡋࡓ㸬 ࡇࡢ㎶ࡾࡢᇼᕝࡣ༑ศ࡞ᕝᖜ㸦50m㸧ࢆࡶࡘࡀ㸪ᮅኤࡣ ㆤᓊ࡟ࡼࡿ᪥ᙳࡀỈ㠃ୖ࡟࡛ࡁࡿࡓࡵ㸪༗๓ࡣྑᓊ㸪༗ ᚋࡣᕥᓊ࡛ィ ࡋࡓ㸬2007 ᖺ 8 ᭶ 21 ᪥࡟࠾ࡅࡿᐇ ⤖ ᯝࢆFig. 12 ࡟♧ࡍ㸬ࡇࡢ᪥ࡢኳೃࡣᬕኳ࡛࠶ࡗࡓࡀ㸪ṇ ༗๓ᚋ࡟㞼ࡀᗈࡀࡗࡓ㸬ᅗ(a)ࡣ ᇼᕝࡢỈ ࡜ᐜჾෆỈ  ࢆẚ㍑ࡋࡓࡶࡢ࡛㸪15 ᫬௨㝆࡟ᕪ␗ࡀㄆࡵࡽࢀࡿࡀ㸪 ௚ࡢ᫬㛫ᖏ࡛ࡣ୧⪅ࡣᴫࡡ୍⮴ࡋ࡚࠸ࡿࡇ࡜ࡀศ࠿ࡿ㸬 Ỉ㠃⵨Ⓨ㔞ࡢ ᐃ⢭ᗘࢆୖࡆࡿࡓࡵ࡟㸪ᾋయᐜჾࡣ3 ྎ㸦No.1㹼3㸧ࢆタ⨨ࡋࡓ㸬ᅗ(b)ࡣ ࡑࡢ ᐃ⤖ᯝࢆ♧ࡋ ࡓࡶࡢ࡛㸪ⱝᖸࡢࡤࡽࡘࡁࡀ⏕ࡌ࡚࠸ࡿ㸬ྛ᫬้࡛3 ྎ ࡢ್ࢆᖹᆒࡍࡿ࡜㸪⵨Ⓨ㔞ࡣἙᕝỈ ࡟ᑐᛂࡋ࡚ኚ໬ࡋ㸪 ༗๓ࡼࡾࡶ༗ᚋࡢ᪉ࡀ኱ࡁ࠸ࡇ࡜ࡀ᫂ࡽ࠿࡜࡞ࡗࡓ㸬  ᅗ(b)࡟♧ࡋࡓ 6 ᫬㹼18 ᫬ࡲ࡛᫬㛫ᖹᆒ⵨Ⓨ㔞ࢆྜィ Fig. 9 Ỉ㠃⵨Ⓨ㔞ࡢ ᐃᡭἲ 䠍 䠐 䠑 䠒 䠍 䠐 䠑 䠒 Photo 1  ᐃ࡟౑⏝ࡋࡓჾල A B C ᇼᕝ 䠎 䠍 55m 60m 70m 70m 25m ซ ౛ 䠖 Ỉ㠃⵨Ⓨ㔞 ᐃᆅⅬ 䠖 㢼㏿䞉Ẽ 䞉‵ᗘ䞉Ẽᅽィ 䠖 Ẽ 䞉‵ᗘ䝅䜵䝹䝍䞊 A A B B C C ᇼᕝ 䠎 䠎 䠍 䠍 55m 60m 70m 70m 25m ซ ౛ 䠖 Ỉ㠃⵨Ⓨ㔞 ᐃᆅⅬ 䠖 㢼㏿䞉Ẽ 䞉‵ᗘ䞉Ẽᅽィ 䠖 Ẽ 䞉‵ᗘ䝅䜵䝹䝍䞊 ซ ౛ 䠖 Ỉ㠃⵨Ⓨ㔞 ᐃᆅⅬ 䠖 㢼㏿䞉Ẽ 䞉‵ᗘ䞉Ẽᅽィ 䠖 Ẽ 䞉‵ᗘ䝅䜵䝹䝍䞊 Fig. 11 ᇼᕝ࡟࠾ࡅࡿỈ㠃⵨Ⓨ㔞࠾ࡼࡧᚤẼ㇟ほ ᆅⅬ Photo 2 ᇼᕝ୰ὶᇦࡢ㢼ᬒ㸦ᚚ㝠ᶫ࠿ࡽ⇕⏣グᛕᶫࢆᮃࡴ㸧 㻞㻡 㻞㻢 㻞㻣 㻞㻤 㻞㻥 㻟㻜 㻟㻝 㻟㻞 㻟㻟 㻟㻠 㻟㻡 㻜᫬ 㻜᫬ 㻜᫬ 㻜᫬ 㻜᫬ 㻜᫬ 㻜᫬ 㻜᫬ 㻜᫬ 㻜᫬ 㻜᫬ 㻜᫬ 㻜᫬   㻌ᗘ 㻌㻔 䉝 㻕 㻠㻜 㻠㻠 㻠㻤 㻡㻞 㻡㻢 㻢㻜 㻢㻠 㻢㻤 㻣㻞 㻣㻢 㻤㻜 ‵ 㻌ᗘ 㻌䠄 䠂 䠅 ィ ᐜჾ䛾ᖹᆒỈ 㻭㻌㼇䉝㼉 ィ ᐜჾ䛾ᖹᆒỈ 㻮㻌㼇䉝㼉 Ἑᕝ䛾ᖹᆒỈ 㻭㻌㼇䉝㼉 Ἑᕝ䛾ᖹᆒỈ 㻮㻌㼇䉝㼉 Ẽ 䠄䉝䠅 ‵ᗘ䠄䠂䠅 ྑᓊഃ ᕥᓊഃ 㻢᫬㻌㻌㻌㻌㻌㻌㻌㻣᫬㻌㻌㻌㻌㻌㻌㻌㻤᫬㻌㻌㻌㻌㻌㻌㻌㻥᫬㻌㻌㻌㻌㻌㻌㻝㻜᫬㻌㻌㻌㻌㻌㻌㻝㻝᫬㻌㻌㻌㻌㻌㻌㻝㻞᫬㻌㻌㻌㻌㻌㻌㻝㻟᫬㻌㻌㻌㻌㻌㻌㻝㻠᫬㻌㻌㻌㻌㻌㻌㻝㻡᫬㻌㻌㻌㻌㻌㻌㻝㻢᫬㻌㻌㻌㻌㻌㻌㻝㻣᫬㻌㻌㻌㻌㻌㻌㻝㻤᫬ ᫬㻌้ (a) ἙᕝỈ ࡜ᐜჾෆỈ ࡢẚ㍑ 㻜㻚㻜 㻜㻚㻝 㻜㻚㻞 㻜㻚㻟 㻜㻚㻠 㻜㻚㻡 㻜㻚㻢 㻜㻚㻣 䠓᫬ 䠔᫬ 䠕᫬ 㻝㻜᫬ 㻝㻝᫬ 㻝㻞᫬ 㻝㻟᫬ 㻝㻠᫬ 㻝㻡᫬ 㻝㻢᫬ 㻝㻣᫬ 㻝㻤᫬ ᫬㻌้ ⵨ Ⓨ 㔞 㻌㼇 㼙 㼙 㻛 㼔㼉 䚷㻺㼛㻚㻝 䚷㻺㼛㻚㻞 䚷㻺㼛㻚㻟 ᖹᆒ್㻌 ྑᓊഃ ᕥᓊഃ 㻢᫬㻌㻌㻌㻌㻌㻌㻌㻌㻌㻣᫬㻌㻌㻌㻌㻌㻌㻌㻌㻌㻤᫬㻌㻌㻌㻌㻌㻌㻌㻌㻌㻥᫬㻌㻌㻌㻌㻌㻌㻌㻝㻜᫬㻌㻌㻌㻌㻌㻌㻌㻌㻝㻝᫬㻌㻌㻌㻌㻌㻌㻌㻌㻝㻞᫬㻌㻌㻌㻌㻌㻌㻌㻌㻝㻟᫬㻌㻌㻌㻌㻌㻌㻌㻌㻝㻠᫬㻌㻌㻌㻌㻌㻌㻌㻌㻝㻡᫬㻌㻌㻌㻌㻌㻌㻌㻌㻝㻢᫬㻌㻌㻌㻌㻌㻌㻌㻌㻝㻣᫬㻌㻌㻌㻌㻌㻌㻌㻌㻝㻤᫬ ᫬㻌้ (b) Ỉ㠃⵨Ⓨ㔞ࡢ᫬㛫ᖹᆒ್ࡢኚ໬ Fig. 12 ᚚ㝠ᶫ௜㏆࡟࠾ࡅࡿỈ㠃⵨Ⓨ㔞ࡢᐇ ⤖ᯝ 㸦 ᐃ᪥᫬㸸2007 ᖺ 8 ᭶ 21 ᪥ 6:00㹼18:00㸧

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ࡍࡿ࡜2.94 mm ࡜࡞ࡿࡀ㸪᪥ἐᚋࡶ⵨Ⓨࡀ⥅⥆ࡍࡿྍ⬟ ᛶࢆ⪃࠼ࡿ࡜㸪᪥⵨Ⓨ㔞࡜ࡋ࡚ࡣ4 mm ⛬ᗘࡢ್࡜࡞ࡿ ࡶࡢ࡜᥎ᐹࡉࢀࡿ㸬㏆⸨࣭᱓ᙧ㸦1992㸧ࡣ㸪ὸ࠸Ỉ㠃㸦Ỉ  ࡢᏘ⠇ኚື࡟ࡼࡿ఩┦㐜ࢀࢆ↓ど࡛ࡁࡿỈᇦ㸧࠿ࡽࡢ ⵨Ⓨ㔞࡟ࡘ࠸࡚ࡢヨ⟬⤖ᯝ࡜ࡋ࡚㸪ྡྂᒇᆅᇦࡢ8 ᭶ࡢ ᭶⵨Ⓨ㔞ࢆ107 mm ࡜᥎ᐃࡋ࡚࠸ࡿ6)㸬ࡇࡢ್ࢆ᪥ᖹᆒ ್࡟┤ࡍ࡜3.45 mm ࡜࡞ࡾ㸪ᬕኳ࡛࠶ࡗࡓ௒ᅇࡢ ᐃ್ ࡀጇᙜ࡞ᩘ್࡛࠶ࡿࡇ࡜ࡀ⿬௜ࡅࡽࢀࡿ㸬 3.3 ᇼᕝ඲య࡟࠾ࡅࡿ₯⇕ࣇࣛࢵࢡࢫࡢ᥎ᐃ Ỉ㠃࠿ࡽࡢ⵨Ⓨࡀ⏕ࡌࡿ࡜㸪₯⇕࡜ࡋ࡚࿘ᅖ࠿ࡽ⇕ࡀ ዣࢃࢀ㸪⤖ᯝ࡜ࡋ࡚Ẽ ࢆୗࡆࡿຠᯝࡀ࠶ࡿ㸬ࡇࡇ࡛ࡣ ᐇ ࡋࡓ⵨Ⓨ㔞ࢹ࣮ࢱ࡟ᇶ࡙࠸࡚㸪ᇼᕝ඲య࠿ࡽዣࢃࢀ ࡿ₯⇕ࣇࣛࢵࢡࢫࢆ⟬ᐃࡋ࡚ࡳࡼ࠺㸬 Ỉ㠃ࡢ༢఩㠃✚㹙m2㹛㸪༢఩᫬㛫㹙s㹛ᙜࡓࡾࡢ₯⇕ࣇ ࣛࢵࢡࢫlE㹙W/m2㹛ࡣḟᘧ࡛୚࠼ࡽࢀࡿ㸬 U ˜ ˜E l lE (1) ࡇࡇ࡟㸪E㸸⵨Ⓨ㔞㹙m/s㹛㸪 l㸸ỈࡢẼ໬⇕㹙J/kg㹛㸪U㸸 Ỉࡢᐦᗘ㹙kg/m3㹛࡛࠶ࡾ㸪l ࡜UࡣỈ ࡢ㛵ᩘ࡛࠶ࡿ㸬 Fig. 12 ࡢほ ್ࢆࡶ࡜࡟㸪₯⇕ࣇࣛࢵࢡࢫࡢ᫬㛫ᖹᆒ ್ࢆィ⟬ࡋࡓ⤖ᯝࢆFig. 13 ࡟♧ࡍ㸬ࡇࢀ࡟ࡼࡿ࡜㸪₯⇕ ࡣỈ ࡢᙳ㡪ࡀ࠶ࡿࡶࡢࡢ㸪⵨Ⓨ㔞ࡢኚ໬࡜㢮ఝࡢኚ໬ ࢆ♧ࡋ࡚࠸ࡿ㸬᭱኱್ࡣ307 W/m2㸪᪥୰ࡢᖹᆒ್ࡣᅗ୰ ࡟◚⥺࡛ᥥ࠸ࡓࡼ࠺࡟165 W/m2࡜኱ࡁ࡞್࡛࠶ࡿ㸬ࡕ࡞ ࡳ࡟㸪ࡇࡢ್࡟ᇼᕝ඲యࡢỈ㠃㠃✚࡜ࡋ࡚A = 1.10™106 m2ࢆ஌ࡌࡿ࡜㸪ᇼᕝ࠿ࡽࡢ༢఩᫬㛫ᙜࡓࡾࡢ₯⇕㍺㏦㔞 ࡣ᭱኱࡛3.4™108 W㸪᪥୰ᖹᆒ࡛ 1.8™108 W ࡜ぢ✚ࡶࡽ ࢀࡿ㸬ྡྂᒇᕷ࡟࠾ࡅࡿ8 ᭶ࡢேᕤ᤼⇕㔞ࢆ 600 TJ/day = 6.94×109 W ࡜௬ᐃࡍࡿ࡜㸪ࡇࢀࡽࡢ್ࡣேᕤ᤼⇕ࡢ 4.9%㸪 2.6%ࢆ྾཰ࡍࡿ㔞࡟┦ᙜࡍࡿ㸬ᇼᕝࡢᏑᅾࡀᬬ⇕໬ࡢ⦆ ࿴࡟୍ᐃࡢᙺ๭ࢆᯝࡓࡋ࡚࠸ࡿࡇ࡜ࡀㄆ㆑ࡉࢀࡼ࠺㸬 4. ᇼᕝ㏆ഐ࡟࠾ࡅࡿᚤẼ㇟ほ  Ỉ㠃⵨Ⓨ࡟ࡼࡿẼ ෭༷ຠᯝ࡟ࡘ࠸࡚㏙࡭ࡓࡀ㸪Ἑᕝ ࡢᙺ๭ࡣࡑࢀࡔࡅ࡛ࡣ࡞ࡃ㸪ᕷ⾤ᆅ࡟࡞࠸㢼ࡢὶࢀ࡟ࡼ ࡗ࡚࿘㎶ᆅᇦ࡟ࡶᙳ㡪ࢆ୚࠼࡚࠸ࡿࡇ࡜ࡀ⪃࠼ࡽࢀࡿ㸬 ࡑࡇ࡛㸪Fig. 11 ࡟♧ࡋࡓᇼᕝ࡜࿘㎶ᆅᇦ࡟࠾࠸࡚Ẽ㇟ほ  ࢆ⾜࠸㸪Ἑᕝࡢᙳ㡪ᗘྜ࠸࡟ࡘ࠸᳨࡚ウࡋࡓ㸬 4.1 ほ 㡯┠࡜ィ ᪉ἲ Ẽ ࡸ‵ᗘࡣほ ᆅⅬࡢ㊰㠃ࡸ᳜⏕➼࡟ᕥྑࡉࢀࡿ ࡓࡵ㸪Ἑᕝ࠿ࡽࡢᙳ㡪ࢆᢕᥱࡍࡿ࡟ࡣ࡛ࡁࡿࡔࡅ୍ᵝ࡞ ✵㛫ࡀᮃࡲࡋ࠸㸬ࡑࡇ࡛௒ᅇࡣ㸪ᇼᕝ࡜ྑᓊ࡟ᗈࡀࡿⓑ 㫽බᅬࢆほ ್ᇦ࡟㑅ᐃࡋࡓ㸬ࡲࡓ㸪ከࡃࡢᆅⅬ࡛ほ  ࡍࡿᚲせ࠿ࡽ㸪 ᐃ㡯┠ࢆ⤠ࡾ5 ᆅⅬ࡛ᐃⅬほ ࢆ⾜ࡗ ࡓ㸬ࡲࡎ㸪Ἑᕝࡢᶫᱱୖ࡜බᅬす➃ࡢ2 ⟠ᡤ࡟㢼ྥ㢼㏿㺃 Ẽ 㺃‵ᗘ㺃Ẽᅽ➼ࢆ ᐃ࡛ࡁࡿྍᦙᆺẼ㇟ほ ィKestrel 4500 ࢆタ⨨ࡋࡓ㸬ࡲࡓ㸪Photo 3 ࡟♧ࡍࡼ࠺࡞⮬↛㏻㢼 ᘧࢩ࢙ࣝࢱ࣮7)ࢆ⮬సࡋ㸪Ẽ ࣭‵ᗘィ ࣮ࣟ࢞TR-72U ࢆ㧗ࡉ1.5m ࡟⤌ࡳ㎸ࢇ࡛බᅬෆࡢ 3 ⟠ᡤ࡟タ⨨ࡋࡓ㸬  ᐃ᫬㛫ࡣ6:00㹼18:00 ࡢ 12 ᫬㛫࡜ࡋ㸪10 ศ㛫㝸࡛ࢹ࣮ ࢱࢆ཰㘓ࡋࡓ㸬౑⏝ࡋࡓィ5 ྎࡢ ᐃᶵჾ࡟ࡘ࠸࡚ࡣ኱ Ꮫᵓෆ࡛ணഛᐇ㦂ࢆ⾜࠸㸪⢭ᗘ࡜┦஫ࡢჾᕪࢆᢕᥱࡋࡓ㸬 4.2 㢼㏿㺃Ẽ 㺃‵ᗘࡢほ ⤖ᯝ 2007 ᖺ 8 ᭶࡟⾜ࡗࡓ⌧ᆅほ ⤖ᯝࢆ Fig. 14 ࡟♧ࡍ㸬 ᅗ(a) ࡣᚚ㝠ᶫࡢ୰ኸ࡜ఫᏯᆅ࡟㞄᥋ࡋࡓබᅬす➃࡟࠾ ࡅࡿ㢼㏿ࡢ᫬㛫ኚ໬ࢆẚ㍑ࡋࡓࡶࡢ࡛࠶ࡿ㸬㢼㏿ࡣ⣽࠿ ࡃኚືࡋ࡚࠸ࡿࡶࡢࡢ㸪Ἑᕝࡢ᪉ࡀఫᏯᆅࡼࡾࡶ㢼ࡀᙉ ࠸ࡇ࡜ࡀ᫂ࡽ࠿࡛࠶ࡿ㸬ᙜ᪥ࡣṇ༗๓ᚋ࡟୍᫬ⓗ࡟᭎ࡗ ࡓࡓࡵ㢼ࡀᙅࡲࡗ࡚࠸ࡿࡀ㸪༗ᚋ࡟࡞ࡿ࡜࡜ࡃ࡟ᕝἢ࠸ ࡛㢼ࡀᙉࡲࡗ࡚࠸ࡿ㸬 ᅗ(b) ࡣ㸪5 ᆅⅬ࡛ ᐃࡋࡓẼ ࡜‵ᗘࢆἙᕝࡢᶓ᩿᪉ ྥࡢศᕸ࡛♧ࡋࡓࡶࡢ࡛࠶ࡿ㸬8 ᭶ 21 ᪥ࡢ᪉ࡀ 11 ᪥ࡼ ࡾࡶ඲య࡟Ẽ ࡀ㧗ࡃ‵ᗘࡣప࠸ࡀ㸪࡝ࡕࡽࡢ᪥࡟࠾࠸ ࡚ࡶ✵㛫ศᕸࡢ≉ᚩࡣඹ㏻ࡋ࡚࠸ࡿ㸬ࡍ࡞ࢃࡕ㸪Ẽ ࡣ Ἑᕝ࡟㏆࠸࡯࡝పࡃ㸪ෆ㝣࡟ྥ࠿࠺࡟ࡘࢀ࡚ୖ᪼ࡍࡿ㸬 ‵ᗘ࡟ࡘ࠸࡚ࡣⱝᖸኚືࡍࡿࡶࡢࡢ㸪ᴫࡡἙᕝ࠿ࡽෆ㝣 ࡟ྥ࠿࠺࡟ࡘࢀ࡚ῶᑡࡍࡿഴྥ࡟࠶ࡿ㸬 㻜 㻝㻜㻜 㻞㻜㻜 㻟㻜㻜 㻣᫬ 㻤᫬ 㻥᫬ 㻝㻜᫬ 㻝㻝᫬ 㻝㻞᫬ 㻝㻟᫬ 㻝㻠᫬ 㻝㻡᫬ 㻝㻢᫬ 㻝㻣᫬ 㻝㻤᫬ ᫬㻌้ ༢ ఩ 㠃 ✚ ᙜ 䜚 䛾 ₯ ⇕ 䝣 䝷䝑 䜽 䝇 䚷l E㻌㼇 㼃 㻛 㼙 㻞㼉 㻢᫬㻌㻌㻌㻌㻌㻌㻌㻌㻌㻣᫬㻌㻌㻌㻌㻌㻌㻌㻌㻌㻤᫬㻌㻌㻌㻌㻌㻌㻌㻌㻌㻥᫬㻌㻌㻌㻌㻌㻌㻌㻝㻜᫬㻌㻌㻌㻌㻌㻌㻌㻌㻝㻝᫬㻌㻌㻌㻌㻌㻌㻌㻌㻝㻞᫬㻌㻌㻌㻌㻌㻌㻌㻌㻝㻟᫬㻌㻌㻌㻌㻌㻌㻌㻌㻝㻠᫬㻌㻌㻌㻌㻌㻌㻌㻌㻝㻡᫬㻌㻌㻌㻌㻌㻌㻌㻌㻝㻢᫬㻌㻌㻌㻌㻌㻌㻌㻌㻝㻣᫬㻌㻌㻌㻌㻌㻌㻌㻌㻝㻤᫬ ᫬㻌้ Fig. 13 ₯⇕ࣇࣛࢵࢡࢫࡢ᫬㛫ⓗኚ໬ࡢ⟬ᐃ⤖ᯝ Photo 3 ࢩ࢙ࣝࢱ࣮ࡢタ⨨≧ἣ㸦ᆅⅬ B ࠿ࡽ C ࢆᮃࡴ㸧

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4.3 ほ ࢹ࣮ࢱ࡟ᇶ࡙ࡃᛌ㐺ᛶᣦᶆࡢホ౯ ୖ㏙ࡋࡓほ ࢹ࣮ࢱࢆࡶ࡜࡟㸪ᇼᕝ࡜࿘㎶ᆅᇦ࡟࠾ࡅ ࡿᛌ㐺ᛶ࡟ࡘ࠸࡚⪃ᐹࡍࡿ㸬ᛌ㐺ᛶࢆᩘ㔞ⓗ࡟ホ౯ࡍࡿ ࡓࡵ࡟ከࡃࡢᣦᶆࡀᥦ᱌ࡉࢀ࡚࠸ࡿࡀ㸪ࡇࡇ࡛ࡣࡼࡃ▱ ࡽࢀࡓ୙ᛌᣦᩘ࡜㸰✀㢮ࡢయឤ ᗘࢆồࡵࡿࡇ࡜࡟ࡍࡿ㸬 ୙ᛌᣦᩘDI㸪࣑ࢫࢼ࣮ࣝࡢయឤ ᗘ TM㸪ࣜࣥࢣࡢయឤ  ᗘTLࡣࡑࢀࡒࢀḟᘧ࡛ィ⟬ࡉࢀࡿ㸬 3 . 46 ) 3 . 14 99 . 0 ( 01 . 0 81 . 0 T H T  DI (2)

¸ ¹ · ¨ © §    100 8 . 0 10 3 . 2 1 T H T TM (3) v T TL 4 (4) ࡇࡇ࡟㸪T㸸Ẽ 㹙Υ㹛㸪H㸸┦ᑐ‵ᗘ㹙%㹛㸪v㸸㢼㏿㹙m/s㹛 ࡛࠶ࡿ㸬Fig.15 ࡣ㸪8 ᭶ 21 ᪥ 14:00 ࡟࠾ࡅࡿほ ್ࢆ⏝ ࠸㸪ୖグ3 ᣦᶆࡢ✵㛫ศᕸࢆ♧ࡋࡓࡶࡢ࡛࠶ࡿ㸬ᅗࢆぢ ࡿ࡜㸪DI ࡢ್ࡣࠕ඲ဨࡀ୙ᛌ࡟ឤࡌࡿࠖ࡜ࡉࢀࡿ 80 ࢆ ඲ᆅⅬ࡛㉸࠼࡚࠾ࡾ㸪㠀ᖖ࡟⵨ࡋᬬ࠸≧ἣ࡛࠶ࡗࡓ࡜࠸ ࠼ࡿࡀ㸪ࡑࡢ್ࡣἙᕝ࠿ࡽ㞳ࢀࡿ࡟ࡘࢀ࡚ቑຍࡋ࡚࠾ࡾ㸪 ෆ㝣㒊࡯࡝୙ᛌࡢᗘྜ࠸ࡀቑࡋ࡚࠸ࡿࡇ࡜ࡀศ࠿ࡿ㸬Ẽ  ࡜‵ᗘ࡟ᇶ࡙ࡃTMࡢ್ࡶDI ࡜ྠᵝ࡞ഴྥࢆ♧ࡋ࡚࠸ ࡿ㸬ࡉࡽ࡟㸪㢼㏿ࢆ⪃៖ࡋࡓTL࡛ࡣᕝἢ࠸࡜ఫᏯᆅ࡜ࡢ ᕪࡣ࠸ࡗࡑ࠺ᗈࡀࡗ࡚࠾ࡾ㸪Ἑᕝࡀ͆㢼ࡢ㐨͇࡛࠶ࡿࡇ ࡜ࡢຠᯝࡀ᫂☜࡟⌧ࢀࡓࡶࡢ࡜࠸࠼ࡿ㸬 5. ࠾ࢃࡾ࡟ ᮏ◊✲࡛ࡣ㸪ྡྂᒇᕷࡢᇼᕝࢆᑐ㇟࡜ࡋ࡚㸪Ỉ㠃࠿ࡽ ࡢ⵨Ⓨ㔞ࢆᐇ ࡋ࡚₯⇕ࣇࣛࢵࢡࢫࢆồࡵࡿࡇ࡜࡟ࡼࡾ㸪 ἙᕝࡢࡶࡘẼ ෭༷ຠᯝࡢホ౯ࢆヨࡳࡓ㸬ࡲࡓ㸪ᇼᕝ࡜ ࿘㎶ᇦࡢከᆅⅬ࡛Ẽ㇟ほ ࢆ⾜ࡗࡓ࡜ࡇࢁ㸪Ἑᕝ࡟㏆࠸ ᆅⅬ࡯࡝Ẽ ࡀపࡃ㢼ࡶᙉ࠸ࡓࡵ㸪ᛌ㐺ᛶࡀ㧗࠸ࡇ࡜ࡀ ᫂ࡽ࠿࡜࡞ࡗࡓ㸬ࡋ࠿ࡋ㸪Ἑᕝࡢᙳ㡪⠊ᅖࡢᗈࡀࡾ࡟ࡘ ࠸࡚ࡣ㸪௒ᅇࡢㄪᰝ༊ᇦࡀἙ␁࠿ࡽ250m ⛬ᗘ࡛࠶ࡗࡓ ࡓࡵ㸪᫂☜࡟࡛ࡁ࡞࠿ࡗࡓ㸬௒ᚋ㸪⛣ືほ ࡶྲྀࡾධࢀ㸪 ᗈ⠊ᅖ࡛ࡢ⇕཰ᨭ≧ἣࢆ᫂ࡽ࠿࡟ࡋࡓ࠸࡜⪃࠼࡚࠸ࡿ㸬 ㅰ㎡ ᮏ◊✲ࢆ㐙⾜ࡍࡿ࡟࠶ࡓࡾ㸪ྡྂᒇᕷ⎔ቃ㒊ࡼࡾㄪᰝ ㈨ᩱࡢᥦ౪ࢆཷࡅࡓ㸬ࡇࡇ࡟グࡋ࡚ㅰពࢆ⾲ࡋࡲࡍ㸬 ཧ⪃ᩥ⊩ 1) ⎔ቃ┬㸸ᖹᡂ 12 ᖺᗘࣄ࣮ࢺ࢔࢖ࣛࣥࢻ⌧㇟ࡢᐇែゎ ᯒ࡜ᑐ⟇ࡢ࠶ࡾ᪉࡟ࡘ࠸࡚ሗ࿌᭩㸪147p.㸪2001. 2) ྡྂᒇᕷ㸸࡞ࡈࡸỈࡢ⎔ ࢃ ᚟άࣉࣛࣥ 㸫㇏࠿࡞Ỉ ࡢ⎔ࡀࡉࡉ࠼ࡿࠕ⎔ቃ㤳㒔࡞ࡈࡸࠖࢆࡵࡊࡋ࡚㸫㸪2007. 3) ୰㒊ࢽ࣮ࣗࣅࢪࢿࢫ༠㆟఍࣭ྡྂᒇᕤᴗ኱Ꮫ㸸ྡྂᒇ ࡢࣄ࣮ࢺ࢔࢖ࣛࣥࢻᑐ⟇࡬ࡢᥦゝ㸪31p.㸪2004. 4) ྡᇛ኱Ꮫ⌮ᕤᏛ㒊Ỉᕤࢩࢫࢸ࣒◊✲ᐊ㸸ྡྂᒇᇛእᇼ ࡏࡏࡽࡂᵓ᝿࡟㛵ࡍࡿ᳨ウሗ࿌᭩㸪56p.㸪2007. 5) ྜྷ⏣ ᑦ࣭࿴ஂ᫛ṇ㸸㒔ᕷἙᕝࡢබඹ㈈࡜ࡋ࡚ࡢ౯್ ホ౯࡟㛵ࡍࡿ⪃ᐹ 㸫ᇼᕝࡢࣄ࣮ࢺ࢔࢖ࣛࣥࢻపῶຠ ᯝ࡟ࡘ࠸࡚㸫㸪ᅵᮌᏛ఍➨62 ᅇᖺㅮ㸪CS11-011㸪2007. 6) ㏆⸨⣧ṇ࣭᱓ᙧᜏ⏨㸸᪥ᮏࡢỈᩥẼ㇟(1)㸸ᨺᑕ㔞࡜Ỉ 㠃⵨Ⓨ㸪Ỉᩥ࣭Ỉ㈨※Ꮫ఍ㄅ㸪5(2)㸪pp.13-27㸪1992. 7) ∵ᒣ⣲⾜ ⦅ 㸸ࠕ㌟㏆࡞Ẽ㇟࣭Ẽೃㄪᰝࡢᇶ♏ࠖ㸪ྂ௒ ᭩㝔㸪pp.7-14㸪2000. 㻜㻚㻜 㻝㻚㻜 㻞㻚㻜 㻟㻚㻜 㻠㻚㻜 㻡㻚㻜 㻢㻚㻜 㻢᫬ 㻣᫬ 㻤᫬ 㻥᫬ 㻝㻜᫬ 㻝㻝᫬ 㻝㻞᫬ 㻝㻟᫬ 㻝㻠᫬ 㻝㻡᫬ 㻝㻢᫬ 㻝㻣᫬ 㻝㻤᫬ 㢼 ㏿ 䚷 䠷 䡉 㻛䡏 䠹 ᚚ㝠ᶫୖ බᅬす➃ ᫬㻌้ (a) Ἑᕝᶫᱱୖ࡜බᅬす➃࡟࠾ࡅࡿ㢼㏿ࡢẚ㍑ 㸦 ᐃ᪥᫬㸸2007 ᖺ 8 ᭶ 21 ᪥ 6:00㹼18:00㸧 㻟㻞 㻟㻟 㻟㻠 㻟㻡 㻟㻢 㻟㻣 㻟㻤 㻙㻞㻡 㻜 㻞㻡 㻡㻜 㻣㻡 㻝㻜㻜 㻝㻞㻡 㻝㻡㻜 㻝㻣㻡 㻞㻜㻜 㻞㻞㻡 㻞㻡㻜 ᇼᕝ䛾୰ᚰ䛛䜙䛾㊥㞳䚷䠷㼙䠹 Ẽ 㻌  䚷 䠷 䉝 䠹 㻞㻡 㻟㻜 㻟㻡 㻠㻜 㻠㻡 㻡㻜 㻡㻡 ‵ 㻌ᗘ 䚷 䠷䠂 䠹 Ẽ 䠄㻤᭶㻝㻝᪥䠅 Ẽ 䠄㻤᭶㻞㻝᪥䠅 ‵ᗘ䠄㻤᭶㻝㻝᪥䠅 ‵ᗘ䠄㻤᭶㻞㻝᪥䠅 (b) Ẽ ࡜‵ᗘࡢᶓ᩿᪉ྥࡢ✵㛫ศᕸ 㸦 ᐃ᪥᫬㸸2007 ᖺ 8 ᭶ 11 ᪥࡜ 21 ᪥㸪ࡑࢀࡒࢀ 14:00㸧 Fig. 14 ⓑ㫽බᅬ࡟࠾ࡅࡿᚤẼ㇟ほ ࡢ⤖ᯝ 㻤㻝 㻤㻞 㻤㻟 㻤㻠 㻤㻡 㻤㻢 㻙㻞㻡 㻜 㻞㻡 㻡㻜 㻣㻡 㻝㻜㻜 㻝㻞㻡 㻝㻡㻜 㻝㻣㻡 㻞㻜㻜 㻞㻞㻡 㻞㻡㻜 ᇼᕝ䛾୰ᚰ䛛䜙䛾㊥㞳䚷䠷㼙䠹 ୙ ᛌ ᣦ ᩘ 㻞㻤 㻞㻥 㻟㻜 㻟㻝 㻟㻞 㻟㻟 య ឤ   ᗘ 䚷 㼇䉝 㼉 ୙ᛌᣦᩘ㻌㻰㻵 యឤ ᗘ䠄䝭䝇䝘䞊䝹䠅㻌㼀㻹 యឤ ᗘ䠄䝸䞁䜿䠅㻌㼀㻸 Fig. 15 ୙ᛌᣦᩘ࠾ࡼࡧయឤ ᗘࡢ⟬ᐃ⤖ᯝ (原稿受理日 平成19 年 9 月 25 日)

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