京 都 大 学 防 災 研 究 所 年 報 第 50 号 B 平 成 19 年 4 月 
Annuals of Disas. Prev. Res. Inst., Kyoto Univ., No. 50 B, 2007 ᄢⷙᮨߥ᳚Ửࠍ઻߁ጊ࿾ᴡᎹߩ᳓ኂߩታ㛎⊛⎇ⓥ਄㊁㋕↵࡮⍹၂ᵏテ㧖࡮᦯ㇱ๺ᒾ㧖㧖࡮ጊ↰⡡㧖㧖㧖࡮Ꮉਛ㦖ఽ㧖㧖㧖㑐⷏ᄢቇᎿቇㇱ㧖㧖㑐⷏ᄢቇᄢቇ㒮Ꮏቇ⎇ⓥ⑼
㧖㧖㧖ᄢ㋕Ꮏᬺᩣᑼળ␠
ⷐ ᣦ⪺⠪ࠄ߇⺞ᩏߒߚ  ᐕߩ૛╣Ꮉᵹၞߩ᳓ኂߣ  ᐕߩ⿷⠀Ꮉߩጊ࿾ᵹၞߩ᳓ኂߢߪ㧘ᄢⷙᮨߥ᳚Ử߇߭߈⿠ߎߐࠇߡ㧘ᴡ㆏ḧᦛㇱߦ߅޿ߡỗ↟ߥⵍኂ߇⊒↢ߒߚ߇㧘ἴኂᤨߩᵹᴫߣⵍኂߩ⊒↢ߣߩ㑐ଥࠍ⸃᣿ߔࠆߚ߼ߦታ㛎⊛ᬌ⸛ࠍⴕߞߚ‫⚿ߩߘޕ‬ᨐ㧘⼱ᐩᐔ㊁ߦ߅޿ߡⰬⴕᴡ㆏߆ࠄ᳚Ửߔࠆᵹࠇߪ㧘᳓㕙൨㈩߇ᐔ࿾਄ߢዪㇱ⊛ߦᄢ߈ߊߥࠆߚ߼㧘ᵹㅦ߽ᄢ߈ߊߥࠅ㧘ㄘ࿾ߩᵞជߥߤߩⵍኂ߇੍ᗐએ਄ߦᄢ߈ߊߥࠆߎߣߥߤߩᣂߚߥ⍮⷗߇ᓧࠄࠇߚ‫ޕ‬ࠠ࡯ࡢ࡯࠼㧦ጊ࿾ᴡᎹ㧘ᵩ᳓ἴኂ㧘᳓ℂታ㛎㧘ᵩ᳓᳚Ử㧘Ⱜⴕᴡ㆏㧝 ᭎ ⺑ᴡ㆏ߩḧᦛㇱߢᴡ㆏᏷߇ዊߐ޿႐วߦߪㄘ࿾ߦ㗼⪺ߥᣂᵹ〝߇ᒻᚑߐࠇߡỗ↟ߥⵍኂ߇⊒↢ߒ㧘ḧᦛㇱߩᴡㄭᐕ㧘ጊ࿾ᴡᎹ߅޿ߡỗ↟ߥ᳓ኂߩ⊒↢߇⋡┙ߟࠃ㆏᏷߇ᄢ߈޿႐วߦߪ᳚Ửᵹߦࠃࠆㄘ࿾ߩᵞជ߇௖߆߁ߦߥߞߚ‫ߥ߁ࠃߩߘޕ‬᳓ኂߣߒߡ㧘 ᐕߩ૛╣Ꮉߢⵍኂ߇ዊߐ߆ߞߚ‫ޕ‬ḧᦛㇱᴡ㆏ߩᴡ㆏᏷ߩ㆑޿ߦࠃ᳓ኂ㧔દ⮮ࠄ㧘㧘㧧ਛᎹࠄ㧘㧧૒⮮㧘㧧ߞߡⵍኂߩ⒟ᐲ߇ᄌࠊࠆߎߣ߇ࠊ߆ߞߚ‫৻ޕ‬ᣇ㧘૛╣਄㊁㧘㧘㧘㧧ᩙጊࠄ㧘㧕㧘 ᐕߩᎹᵹၞߩᡰᎹ㤥Ꮉߩਃ⬿Ꮉวᵹὐ߆ࠄ⼾ንᯅ߹ߢߩർᶏ㆏⽕㔎ἴኂߦ߅ߌࠆෘ೎Ꮉߩ᳓ኂ㧔㐳⼱Ꮉ㧘㧕㧘MO ߩ඙㑆ߦ߅޿ߡߪ㧘ᴡ㆏ḧᦛㇱߩౝጯ஥ߦ࿾⋚ ᐕߩ⑔੗⽕㔎ἴኂߦ߅ߌࠆ⿷⠀Ꮉጊ࿾ᵹၞߩ᳓㜞߇ૐ޿ㄘ࿾߇ᴡ㆏ߦᴪߞߡᏪ⁁ߦㅪߥߞߡ߅ࠅ㧘ἴኂ㧔ቝᴦᯅ࡮ᐢㇱ㧘㧧ዊ㜞ࠄ㧘㧧਄㊁࡮⍹၂㧘ኂᤨߦߪㄘ࿾ߩ࿾⋚㜞߇ૐ޿ㇱಽࠍ᳚Ửᵹ߇ᵹਅߒߚ㧕㧘 ᐕߩบ㘑  ภߦࠃࠆ↱⦟Ꮉߩ᳓ኂ㧔ㄞᧄ࡮ߚ߼ߦ㧘ḧᦛㇱߩᴡ㆏᏷߇ዊߐ޿႐วߢ߽ⵍኂ߇⋧ኻ੗਄㧘㧧㚍႐ࠄ㧘㧕㧘 ᐕߩᎹౝᎹߩጊ࿾⊛ߦዊߐߊߥߞߚ‫⿷ޕ‬⠀Ꮉߩ⠀↢Ꮉวᵹὐ߆ࠄ਄ᵹߩᵹၞߩ᳓ኂ㧔ዊ᧻࡮᛼Ꮉ㧘㧧ዊ᧻ࠄ㧘㧕ߥߤ⚂ MO ߩ඙㑆ߦ߅޿ߡ㧘⼱߇Ⱜⴕߒߡ޿ࠆ႐ᚲߢߪ㧘߇᜼ߍࠄࠇࠆ‫ޕ‬ጊ࿾ᴡᎹߩᵹၞߦߪੱญ߇ዋߥ޿ߚ߼㧘ᄙߊߩ႐วߦᴡ㆏ߣጊߦ࿐߹ࠇߚਃⷺᒻ⁁ߩᐔ࿾ߩ਄ᴡᎹᡷୃ߇ㆃࠇߡ߅ࠅ㧘ᵹၞࠍᧂᦦ᦭ߩ⽕㔎߇ⷅ߁ߣ㧘ᵹ஥ߢߪ࿯࿾ߣᴡᐥߣߩᮡ㜞Ꮕ߇ዊߐߊ㧘ਅᵹ஥ߢߪỗ↟ߥ᳓ኂ߇⊒↢ߔࠆߎߣߦߥࠆ‫ޕ‬ᮡ㜞Ꮕ߇ᄢ߈ߊߥߞߡ޿ࠆ‫ߜࠊߥߔޕ‬㧘ߎࠇߪᐔ࿾ߩ⪺⠪ࠄߪ  ᐕߩ૛╣Ꮉᵹၞߩ᳓ኂ㧔਄㊁㧘㧘൨㈩߇⼱ߩ൨㈩ࠃࠅ߽ዊߐ޿ߎߣࠍᗧ๧ߔࠆ߇㧘ᴡ㆏㧘㧕ߣ  ᐕߩ⿷⠀Ꮉߩጊ࿾ᵹၞߩ᳓ኂ㧔਄ḧᦛㇱߦ߅޿ߡᄢⷙᮨߥ᳚Ử߇޽ߞߚߦ߽߆߆ࠊࠄߕ㧘㊁࡮⍹၂㧘㧕ߦߟ޿ߡ⺞ᩏߒߚ‫ߩࠄࠇߎޕ‬᳓ኂߢߎߩࠃ߁ߥ⼱ᐩᐔ㊁ߩᒻ⁁ࠍᜬߞߡ޿ࠆߎߣߦࠃߞߡߪ㧘ᵩ᳓ᵹ㊂߇ᴡ㆏ߩᵹਅ⢻ജࠍߪࠆ߆ߦ⿥߃㧘ᄢⷙⵍኂ߇ᄢ߈޿▸࿐߇ᐔ࿾ߩ਄ᵹ஥ߦ㒢ࠄࠇ㧘᳚Ửᵹߩᮨߥ᳚Ử߇߭߈⿠ߎߐࠇߡ㧘ᴡ㆏ḧᦛㇱߦ߅޿ߡỗ↟ᵹㅦ߇ዊߐߊߥߞߡ㧘ⵍኂߪ⋧ኻ⊛ߦዊߐߊߥߞߚ‫ޕ‬ߥⵍኂ߇⊒↢ߒߚ߇㧘ߤߎߢ߽หߓࠃ߁ߦᄢ߈ߥⵍኂᧄ⎇ⓥߪ㧘ḧᦛㇱߩᴡ㆏ߣ⼱ᐩᐔ㊁ߩᒻ⁁ߩ㑐ଥࠍ߇⊒↢ߒߚߩߢߪߥߊ㧘ᴡ㆏ߣ⼱ᐩᐔ㊁ߩᒻ⁁ߦᔕߓᮨᑼൻߒߡታ㛎᳓〝ࠍ⵾૞ߒ㧘⸘᷹඙㑆ߩᴡ㆏ߣ⼱ᐩߡⵍኂߩ⊒↢ߦᄢ߈ߥ㆑޿߇޽ࠆߎߣ߇ࠊ߆ߞߚ‫ޕ‬ᐔ㊁ߩᒻ⁁ࠍᢙࠤ࡯ࠬᄌൻߐߖߡ㧘ߐࠄߦߘࠇߙࠇߩᴡ㆏߅ࠃ߮⼱ᐩᐔ㊁ߩᒻ⁁ߣⵍኂߩ⊒↢ߣߩ㑐ଥߦ᳓〝᧦ઙߩਅߢᵹ㊂ࠍᄌൻߐߖߡ⴫㕙ᵹㅦ㧘᳓㕙ᒻ߅ߟ޿ߡ㧘ߘߩ․ᓽࠍㅀߴࠆߣ㧘૛╣Ꮉᵹၞߦ߅޿ߡߪࠃ߮ౝㇱᵹㅦࠍ⸘᷹ߒ㧘ἴኂᤨߩᵹᴫߣⵍኂߩ⊒↢ߣ－ 683 －ߩ㑐ଥࠍታ㛎⊛ߦ⸃᣿ߒࠃ߁ߣߔࠆ߽ߩߢ޽ࠆ‫੹ޕ‬ᐕ␜ߔ‫ޕ‬Photo 2 ߪᴡ㆏᏷߇৻ቯ㧔EO㧕ߩ႐วߩ⁁ᘒࠍᐲߩ⎇ⓥߦ߅޿ߡߪ㧘ḧᦛ㗂ὐߩᴡ㆏᏷ࠍᄌൻߐߖߚ␜ߒߡ߅ࠅ㧘↹㕙ߩᏀ஥߇਄ᵹߢ޽ࠅ㧘✛ߩᦛ✢ߪⰬ႐วߩᵹᴫࠍኻ⽎ߦߒߡ㧘⴫㕙ᵹㅦߣ᳓㕙ᒻࠍ⸘᷹ߒⴕᴡ㆏ࠍ㧘⿒ߩᦛ✢ߪ⼱ߩႺ⇇ࠍ␜ߔ‫ޕ‬౮⌀ߩ✛ߩᢳߚ⚿ᨐߦߟ޿ߡႎ๔ߔࠆ‫ޕ‬✢ㇱࠍขࠅ឵߃ࠆߎߣߦࠃࠅ㧘ታ㛎᧦ઙࠍએਅߩࠃ߁ߦᄌൻߐߖࠆߎߣߦߒߚ‫߅ߥޕ‬㧘ᢳ✢ㇱߩว᧼ࠍขࠅ㧞 ታ㛎ᣇᴺ ታ㛎᳓〝ᦧ߃ߡ߽㧘ߘࠇ߇࿕ቯߒߚᴡ㆏ߣṖࠄ߆ߦធ⛯ߔࠆࠃ 㐳ߐ O㧘᏷ O㧘᳓〝൨㈩  ߩࠦࡦࠢ࡝࡯࠻⵾࡯ࠬߦᄌൻߐߖߚ‫ߩࠄࠇߎޕ‬ᴡ㆏ߩ✢ᒻߪᓟㅀߩ Fig.2

ߩ᳓〝ߩਛߦ㧘ෘߐ EO ߩว᧼ࠍ  ᨎ⾍ࠅวࠊߖߡએਅߦ␜ߐࠇߡ޿ࠆ‫ޕ‬ᒻ⁁ࠍᢛ߃㧘ᷓߐ EO ߩⰬⴕߔࠆᴡ㆏ߣ⼱ᐩߩᐔ࿾߁ߦߒߚ‫ޕ‬㧕ḧᦛ㗂ὐߩᴡ㆏᏷ࠍ EO㧘EO ߅ࠃ߮ EO ߩ㧟ࠤࠍ૞ߞߚ‫ޕ‬ᵄ㐳߇ O ߩⰬⴕᴡ㆏ࠍ  ᵄ㐳ಽߟߊࠅ㧘ᵄ㐳⋡ߢ⸘᷹ࠍⴕߞߚ‫ޕ‬਄ਅᵹߩ⋥✢ㇱಽࠍ฽߼ࠆߣ㧘ታ㛎᳓〝ߩో㐳ߪ O ߢ޽ࠆ‫ޕ‬ታ㛎᳓〝ߩ᭎ⷐࠍ
Photo 1 ߦ␜ߔ߇㧘↹㕙ߩ਄ᣇ߇਄ᵹߢ޽ࠆ‫ޕ‬ታ㛎᳓〝ߩ⵾૞ߦᒰߞߡߪ㧘⃻࿾ߩᴡᎹߣ⼱ᐩᐔ㊁ߩᒻ⁁ߩታᘒࠍߢ߈ࠆߛߌ෻ᤋߐߖࠆࠃ߁ߦദ߼ߚ‫⼱ޕ‬ߩႺ⇇ߪ UKP ࠞ࡯ࡉߢ✭ߊⰬⴕ㧔Ⱜⴕᐲߪ 㧕ߐߖ㧘

Test section⼱ߩⰬⴕߩ૏⋧ࠍ EO ਅᵹߦߕࠄߒߡᦨᄢ஍ⷺ  ᐲ㧘Ⱜⴕᐲ  ߩ UKPGIGPGTCVGFEWTXG ߩⰬⴕᴡ㆏ࠍ㈩⟎ߒߚ‫⼱ޕ‬᏷߅ࠃ߮ᴡ㆏᏷ߪߘࠇߙࠇ EO ߅ࠃ߮ EOߢ㧘Ⱜⴕᴡ㆏ߩⰬⴕߩ㗂ὐߪ⼱ߩႺ⇇ߦធߔࠆࠃ߁ߦߒߚ‫ޕ‬૛╣Ꮉ߅ࠃ߮⿷⠀Ꮉߩᴡ㆏ߩᦨᄢ஍ⷺߣⰬⴕᐲ
ࠍ Fig.1 ߦ␜ߔ‫ߩࠄࠇߎޕ‬ᴡᎹߩᴡ㆏ߩᦨᄢ஍ⷺ߅ࠃ߮Ⱜⴕᐲߩᐔဋ୯ߪߘࠇߙࠇ  ᐲ߅ࠃ߮  ߢ޽ࠆ‫ޕ‬ታ㛎᳓〝ߩᒻ⁁ߪߎࠇࠄߩ୯ࠍෳ⠨ߦߒߡ᳿ቯߒߚ‫ޕ‬
Fig.1 ߦ߅޿ߡ㧘ᄢ߈޿⿒ਣ߇ታᴡᎹߩᐔဋ୯㧘✛ߩ߭ߒᒻ߇ታ㛎᳓〝ߩᒻ⁁ߣߒߡណ↪ߒߚ୯ߢ޽ࠆ‫ޕ‬ ታ㛎᧦ઙታ㛎᳓〝ߩ⸘᷹඙㑆ࠍ Photo 2 ߩ⺑᣿౉ࠅߩ౮⌀ߦ

Photo 1 The experimental flume㪪㫀㫅㫌㫆㫊㫀㫋㫐㪈㪅㪏㪈㪅㪎㪈㪅㪍㪈㪅㪌㪈㪅㪋㪈㪅㪊㪈㪅㪉㪈㪅㪈㪈㪇㪈㪇㪉㪇㪊㪇㪋㪇㪌㪇㪍㪇㪎㪇㪏㪇㪐㪇㪤㪸㫏㫀㫄㫌㫄㩷㪻㪼㪽㫃㪼㪺㫋㫀㫆㫅㩷㪸㫅㪾㫃㪼䋨㩷㫦䋩Fig.1 Maximum deflection angle and sinuosity in the Yosasa River and the Asuwa River－ 684 －㧕ḧᦛ㗂ὐߩᴡ㆏᏷߇ EO ߅ࠃ߮ EO ߩ႐วߦߟ޿ߡ㧘ḧᦛᴡ㆏ߩౝጯ஥ߩᏪ⁁㗔ၞߩᐔ࿾ࠍEOૐ
%JCPPGNYKFVJ㧧 EOߊߒߚ‫ߦ߼ߚߩߎޕ‬㧘ᴡ㆏ࠍᒻᚑߔࠆ㧟ᨎߩว᧼ߩ߁(NQYߜ਄ㇱߩ߽ߩࠍ㧘ᴡ㆏᏷߇ḧᦛ㗂ὐߢߐࠄߦ EO ᐢߊߥࠆว᧼ߦขࠅᦧ߃ߚ‫ޕ‬㧕ḧᦛ㗂ὐߩᴡ㆏᏷߇ EO ߣ EO ߩ႐วߦߟ޿ߡ㧘 EOḧᦛᴡ㆏ߩౝጯ஥ߩᐔ࿾ߩ൨㈩ࠍዊߐߊߒߚ‫ޕ‬ એ਄ߩ࿾ᒻ⊛᧦ઙߩਅߢ㧘ᵹ㊂ࠍᄌൻߐߖࠆߎߣߦ㧞 Oࠃࠅ㧘ᴡ㆏᏷߇৻ቯߩ඙㑆ߦ߅ߌࠆ᳚Ửේߩ᳓ᷓࠍ㧠ㅢࠅߦᄌൻߐߖߡታ㛎ࠍⴕ߁ߎߣߦߒߚ‫ߜࠊߥߔޕ‬㧘ᴡ㆏ౝߩ᳓ᷓߦኻߔࠆ᳚Ửේߩ᳓ᷓߩഀว㧰T ࠍ 㧘㧘㧘 ߦᄌൻߐߖߚ‫ޕ‬㧰T㧩 ߪᴡ㆏ḩ᧰ᵹ

Photo 2 The test section of experimental flume㊂ߩ⁁ᘒࠍᗧ๧ߒߡ޿ࠆ‫ޕ‬ ᵹᴫߩ⸘᷹ᣇᴺታ㛎ߢߪ㧘ࠦࡦࠢ࡝࡯࠻⵾ߩ᳓〝ߩਅᵹ┵ߩႍࠍ⺞▵ߔࠆߎߣߦࠃࠅታ㛎᳓〝ౝߩ᳓㕙߇╬ᵹ⁁ᘒߦߥࠆࠃ߁ߦߒߡ㧘Ⱜⴕᴡ㆏  ᵄ㐳ಽߩ߁ߜߩ  ᵄ㐳⋡ߦ߅޿ߡ㧘⴫㕙ᵹㅦߣ᳓૏ࠍ⸘᷹ߒߚ‫ޕ‬዁᧪ߪ㧘㔚⏛ᵹㅦ⸘ࠍ↪޿ߡౝㇱߩਃᰴరᵹᴫࠍ⸘᷹ߔࠆ੍ቯߢ޽ࠆ‫ޕ‬⴫㕙ᵹㅦߩ⸘᷹ߢߪ㧘⋥ᓘ OO ߩႮൻࡆ࠾࡞ߩ࠻

㧔a㧕㧰r㧩0㧔Bankfull㧕࡟࡯ࠨ࡯ࠍ⸘᷹඙㑆ߩ਄ᵹ஥߆ࠄᢔᏓߒ㧘᳓〝ߩ਄ᣇߦ⸳⟎ߒߚࡆ࠺ࠝࠞࡔ࡜ࠍ↪޿ߡ⴫㕙ᵹᴫߩนⷞൻ᠟ᓇࠍⴕߞߚ‫ޕ‬ᓧࠄࠇߚേ↹߆ࠄ  ⑽㑆  ࡈ࡟࡯ࡓߩ㕒ᱛ↹ࠍ᛽಴ߒ㧘2+8 ⸃ᨆࡊࡠࠣ࡜ࡓࠍ↪޿ߡ⴫㕙ᵹㅦࠍ᳞߼ߚ‫ߚ߹ޕ‬㧘᳓૏ߪ⿥㖸ᵄ᳓૏⸘ࠍ↪޿ߡ⸘᷹ߒߚ‫ޕ‬㧟 ታ㛎⚿ᨐߣ⠨ኤ㧔b㧕㧰r㧩0.17 ⴫㕙ᵹㅦߩ․ᓽᴡ㆏᏷߇৻᭽ߥ᳓〝ߦ߅޿ߡ㧘᳚Ửේߩ᳓ᷓࠍ㧠ㅢࠅߦᄌൻߐߖߚ႐วߩ⴫㕙ᵹㅦಽᏓࠍ Fig.2 ߦ␜ߔ‫ޕ‬26㧔a㧕࿑ߪᴡ㆏ḩ᧰ᵹ㊂ࠍᵹߒߚ႐วߢ޽ࠆ߇㧘ᴡ㆏ḧᦛߩ㗂ὐઃㄭߩ⴫㕙ᵹㅦ߇ᄢ߈ߊ㧘ㅦ޿ᵹࠇ߇ḧᦛㇱߩᄖጯߦⴣ⓭ߒߡ޿ࠆߎߣ߇ࠊ߆ࠆ‫ޕ‬᳚Ửේߩ᳓ᷓ߇ᴡ㆏ౝߩ᳓ᷓߩ  ୚ߩ႐ว㧔㧰T㧩㧕ߩ㧔b㧕࿑ߦ߅޿ߡߪ㧘⴫㕙ᵹㅦ߇ᄢ߈޿㗔ၞ߇᳚Ửේߩ਄ߦ޽ࠅ㧘ߘߎߢߩᵹㅦࡌࠢ࠻࡞ߪᮮᣇะᚑಽ߇ᄢ߈ߊߥߞ     㧔c㧕㧰r㧩0.31
10ߡ޿ࠆ‫⴫ޕ‬㕙ᵹㅦ߇ᄢ߈޿㗔ၞࠍᵹਅᣇะߦ❬ߋߣ㧘᳚Ửᵹ߇⼱ࠍⰬⴕߒߥ߇ࠄᵹਅߒߡ޿ࠆߎߣ߇ࠊ߆ࠆ‫ޕ‬㧔b㧕࿑㧘㧔c㧕࿑߅ࠃ߮㧔d㧕࿑ࠍᲧセߔࠆߣ㧘᳚Ửේߩ᳓ᷓ߇ᄢ߈ߊߥࠆ߶ߤ᳚Ửᵹߩ⴫㕙ᵹㅦ߇ᄢ߈ߊߥ

0(cm/s)ࠅ㧘᳚Ửᵹߩᵹㅦࡌࠢ࠻࡞ߩᮮᣇะᚑಽ߇ዊߐߊߥߞ
ߡ㧘᳚ỬᵹߩਥᵹߩⰬⴕ߇ዊߐߊߥࠆߎߣ߇ࠊ߆ࠆ‫ޕ‬ ḧᦛ㗂ὐߩᴡ㆏᏷߇ EO ߅ࠃ߮ EO ߩ᳓〝ߦ߅޿ߡ㧘ᴡ㆏᏷߇৻ቯߩ඙㑆ߦ߅޿ߡᴡ㆏ḩ᧰ߦߥࠆᵹ㊂ࠍᵹߒߚ႐วߩ⴫㕙ᵹㅦಽᏓࠍ Fig.3 ߦ␜ߔ‫ޕ‬
㧔a㧕࿑

－ 685 －

㧔d㧕㧰r㧩0.45
Fig.2

Water surface velocity in uniform channel㧔ḧᦛ㗂ὐߩᴡ㆏᏷߇ EO ߩ᳓〝㧕ߦ߅޿ߡߪᴡ㆏ߩ㧔a㧕࿑㧔ḧᦛ㗂ὐߩᴡ㆏᏷߇ EO ߩ᳓〝㧕㧘㧔b㧕࿑㧔ḧḧᦛㇱ߇⁜޿ߚ߼ߦ㧘ḧᦛㇱߩౝጯ஥ߢ᳚Ửᵹ߇⊒↢ᦛ㗂ὐߩᴡ㆏᏷߇ EO ߩ᳓〝㧕߅ࠃ߮ Fig.2 ߩ㧔d㧕ߔࠆߣหᤨߦ㧘᳚Ửߪ⼱ߩ਄ᵹ஥ߦ߽෸ࠎߢ޿ࠆߎߣ࿑㧔৻᭽᳓〝ߩ㧰T㧩 ߩ႐ว㧕ࠍᲧセߔࠆߣ㧘޿߇ࠊ߆ࠆ‫ޕ‬㧔a㧕࿑ߣ Fig.2 ߩ㧔b㧕࿑㧔৻᭽᳓〝ߩ㧰Tߕࠇߩ႐วߦ߽᳚Ửᵹߩᵹㅦࡌࠢ࠻࡞ߩᮮᣇะᚑಽ߇㧩 ߩ႐ว㧕ߣࠍᲧセߔࠆߣ㧘ਔ⠪ߩ⴫㕙ᵹㅦಽᏓዊߐߊߥߞߡ㧘᳚ỬᵹߩਥᵹߩⰬⴕ߇ዊߐ޿ߎߣ㧘ḧߩࡄ࠲࡯ࡦߪࠃߊૃߡ޿ࠆ߇㧘৻᭽᳓〝ߢᵹ㊂߇⋧ኻᦛ㗂ὐߩᴡ㆏᏷߇ዊߐ޿߶ߤ᳚Ửᵹߩ⴫㕙ᵹㅦ߇ᄢ߈⊛ߦᄢ߈޿႐วࠃࠅ߽ᴡ㆏᏷߇ዊߐ޿᳓〝ߢᴡ㆏ḩ᧰ߊߥࠆߎߣ߇ࠊ߆ࠆ‫ޕ‬

ᵹ㊂ࠍᵹߒߚ႐วߩᣇ߇㧘᳚Ửᵹߩ⴫㕙ᵹㅦ߇ᄢ߈ߊ એ਄ߩታ㛎⚿ᨐ߆ࠄᵈ⋡ߔࠆߴ߈ታᘒߣߒߡ㧘ḧᦛߥࠆߎߣ߇ࠊ߆ࠆ‫ߪߣߎߩߎޕ‬ᵈ⋡ߔࠆߴ߈ౝኈߢ޽

㗂ὐߩᴡ㆏᏷߇ዊߐ޿᳓〝ߦ߅޿ߡᴡ㆏ḩ᧰ᵹ㊂ࠍᵹࠆ‫ߚ߹ޕ‬㧘㧔b㧕࿑㧔ḧᦛ㗂ὐߩᴡ㆏᏷߇ EO ߩ᳓〝㧕ߒߚ႐วߦߪ㧘หߓ᳓〝߿৻᭽᳓〝ߢᵹ㊂߇⋧ኻ⊛ߦ

ߣ Fig.2 ߩ㧔a㧕࿑㧔৻᭽᳓〝ߩᴡ㆏ḩ᧰ᵹ㊂ߩ႐ว㧕ᄢ߈޿႐ว㧔㧰T㧩㧕ࠃࠅ߽㧘᳚Ửᵹߩ⴫㕙ᵹㅦ߇ߣࠍᲧセߔࠆߣ㧘৻᭽᳓〝ߢߪㅦ޿ᵹࠇ߇ḧᦛㇱߩᄖᄢ߈ߊߥࠆߎߣ߇᣿ࠄ߆ߦߥߞߚ‫ޕ‬ጯߦⴣ⓭ߒߡ޿ࠆߩߦኻߒߡ㧘ḧᦛ㗂ὐߩᴡ㆏᏷߇ᄢ߈޿႐วߦߪḧᦛㇱߩᄖጯ஥ߩᵹㅦ߇ㆃߊߡᅢ߹ߒ޿ᵹࠇߦߥߞߡ޿ࠆߎߣ߇ࠊ߆ࠆ‫ޕ‬ ḧᦛ㗂ὐߩᴡ㆏᏷߇ EO ߅ࠃ߮ EO ߩ᳓〝ߦ߅޿ߡ㧘㧰T㧩 ߩ႐วߩ⴫㕙ᵹㅦಽᏓࠍ Fig.4 ߦ␜ߔ‫ޕ‬26㧔a㧕࿑㧔ḧᦛ㗂ὐߩᴡ㆏᏷߇ EO ߩ᳓〝㧕㧘㧔b㧕࿑㧔ḧᦛ㗂ὐߩᴡ㆏᏷߇ EO ߩ᳓〝㧕߅ࠃ߮ Fig.2 ߩ㧔b㧕࿑㧔৻᭽᳓〝ߩ㧰T㧩 ߩ႐ว㧕ࠍᲧセߔࠆߣ㧘ḧᦛ㗂ὐߩᴡ㆏᏷߇ዊߐ޿߶ߤ᳚Ửᵹߩ⴫㕙ᵹㅦ߇ᄢ߈

㧔a㧕Narrow channel㧔㧰r㧩0.17㧕ߊߥࠅ㧘᳚Ửᵹߩᵹㅦࡌࠢ࠻࡞ߩᮮᣇะᚑಽ߇ዊߐߊ

10ߥߞߡ㧘᳚ỬᵹߩਥᵹߩⰬⴕ߇ዊߐߊߥࠆߎߣ߇ࠊ߆ࠆ‫ߚ߹ޕ‬㧘㧔a㧕࿑ߣ Fig.3 ߩ㧔a㧕࿑㧔ᴡ㆏ḩ᧰ᵹ㊂ߩ
႐ว㧕ߣࠍᲧセߔࠆߣ㧘ḧᦛ㗂ὐߩᴡ㆏᏷߇ዊߐ޿᳓〝ߦ߅޿ߡߪ㧘ᵹ㊂߇⋧ኻ⊛ߦᄢ߈޿႐ว㧔㧰T㧩㧕ࠃࠅ߽ᴡ㆏ḩ᧰ᵹ㊂ࠍᵹߒߚ႐วߩᣇ߇㧘᳚Ửᵹߩ⴫

0(cm/s)㕙ᵹㅦ߇ᄢ߈ߊߥࠆߎߣ߇ࠊ߆ࠆ‫ߪߣߎߩߎޕ‬ᵈ⋡ߔࠆߴ߈ౝኈߢ޽ࠆ‫ޕ‬ ḧᦛ㗂ὐߩᴡ㆏᏷߇ EO ߅ࠃ߮ EO ߩ᳓〝ߦ߅޿   㧔b㧕Wide channel㧔㧰r㧩0.17㧕ߡ㧘㧰T㧩 ߩ႐วߩ⴫㕙ᵹㅦಽᏓࠍ Fig.5 ߦ␜ߔ‫ޕ‬

Fig.4



Water surface velocity in shallow depth condition

2626



㧔a㧕Narrow channel

㧔a㧕Narrow channel㧔㧰r㧩0.45㧕

10100(cm/s)

0(cm/s)    㧔b㧕Wide channel
Fig.3

㧔b㧕Wide channel㧔㧰r㧩0.45㧕

Water surface velocity in bankfull condition

Fig.5－ 686 －

Water surface velocity in deep depth condition ⴫㕙ߩ⊒ᢔಽᏓߩ․ᓽ

ߔ‫ޕ‬࿑ߦ߅޿ߡ㧘᳓ᷓಽᏓߪฦ࿾ὐߩ᳓ᷓࠍᐔဋ᳓ᷓ ਄ㅀߩࠃ߁ߦ㧘ḧᦛ㗂ὐߩᴡ㆏᏷߇ዊߐ޿᳓〝ߦ߅ߢ㒰ߒߚ୯ߢ␜ߒߡ޿ࠆ‫ޕ‬

޿ߡߪ․ᓽ⊛ߥᵹᴫ߇⊒↢ߔࠆߎߣ߇᣿ࠄ߆ߦߥߞߚ‫ޕ‬ ࿑ߦ߅޿ߡ㧘᳓ᷓ߇⋧ኻ⊛ߦᄢ߈ߊߥߞߡ޿ࠆ႐ᚲ

ߒߚ߇ߞߡ㧘ߎߎߢߪ߹ߕḧᦛ㗂ὐߩᴡ㆏᏷߇ዊߐ޿

ߪ㧘ߎࠇࠄߩ࿑ߦኻᔕߔࠆ⴫㕙ߩ⊒ᢔಽᏓ࿑ߩ Fig.6᳓〝ߩᵹࠇߦ߅ߌࠆ⴫㕙ߩ⊒ᢔಽᏓߦߟ޿ߡᬌ⸛ߔࠆ‫ޕ‬㧔b㧕࿑߅ࠃ߮ Fig.7㧔a㧕࿑ߦ߅޿ߡ਄᣹ᵹ߇ᒝߊߥߞ ḧᦛ㗂ὐߩᴡ㆏᏷߇ EO ߩ᳓〝ߦ߅޿ߡ㧘᳚Ửේߩߡ޿ࠆ႐ᚲߣ߶߷৻⥌ߔࠆߎߣ߇ࠊ߆ࠆ‫ߜࠊߥߔޕ‬㧘᳓ᷓࠍ㧠ㅢࠅߦᄌൻߐߖߚ႐วߩ⴫㕙ߩ⊒ᢔಽᏓࠍ

Fig.6 ߦ␜ߔ‫ޕ‬࿑ߦ߅޿ߡ㧘⊒ᢔಽᏓ߇ᱜߩ㗔ၞߢߪ਄᣹ᵹ߇⊒↢ߒߡ߅ࠅ㧘⊒ᢔಽᏓ߇⽶ߩ㗔ၞߢߪਅ㒠ᵹ߇⊒↢ߒߡ޿ࠆߣ⸃㉼ߔࠆߎߣ߇ߢ߈ࠆ‫ޕ‬㧔a㧕࿑ߪᴡ㆏ḩ᧰ᵹ㊂ࠍᵹߒߚ႐วߢ޽ࠆ߇㧘ᴡ㆏ߩ⁜⓰ㇱߩ਄ᵹ஥߆ࠄ᳚Ửߔࠆᵹࠇߦᒝ޿਄᣹ᵹ߇⊒↢ߒߡ޿ࠆߎߣ߇ࠊ߆ࠆ‫ߚ߹ޕ‬㧘᳚Ửᵹ߇ᴡ㆏ߦᚯࠆㄝࠅߢߪᴉߺㄟߺ߇ᒝ޿ߎߣ߇ࠊ߆ࠆ‫ޕ‬㧔a㧕࿑߆ࠄ㧔d㧕࿑߹ߢࠍᲧセߔࠆߣ㧘㧔b㧕࿑㧘㧔c㧕࿑߅ࠃ߮㧔d㧕࿑ߦ߅޿ߡߪ᳚Ửේߩ᳓ᷓ߇ᄢ߈ߊߥࠆ߶ߤ਄᣹ᵹߣᴉߺㄟߺ߇ᒝߊߥࠆ߇㧘ਃ⠪ߣ߽㧔a㧕࿑ߩᴡ㆏ḩ᧰ᵹ㊂ࠍᵹߒߚ႐วࠃࠅ߽਄᣹ᵹߣᴉߺㄟߺ߇߆ߥࠅᒙߊߥߞߡ޿ࠆߎߣ

㧔a㧕㧰r㧩0㧔Bankfull㧕߇ࠊ߆ࠆ‫ߜࠊߥߔޕ‬㧘ḧᦛ㗂ὐߩᴡ㆏᏷߇ EO ߩ᳓〝ߦ߅޿ߡᴡ㆏ḩ᧰ᵹ㊂ࠍᵹߒߚ႐วߦߪ㧘․೎ߥᵹᴫ߇⊒↢ߒߡ޿ࠆߎߣ߇ℂ⸃ߢ߈ࠆ‫ߚ߹ޕ‬㧘ἴኂᤨߩㄘ
࿾ߩᵞជߦኻߒߡߪ㧘ߎߩࠃ߁ߦᴡ㆏ߩḧᦛㇱߩ਄ᵹ஥ߢᐔ࿾ߦਸ਼ࠅ਄ߍࠆࠃ߁ߥ਄᣹ᵹߩᓎഀ߇ᄢ߈޿ߣ⠨߃ࠄࠇࠆ‫ޕ‬ᴡ㆏᏷߇৻᭽ߥ᳓〝ߦ߅޿ߡ㧘᳚Ửේߩ᳓ᷓࠍ㧟ㅢࠅߦᄌൻߐߖߚ႐วߩ⴫㕙ߩ⊒ᢔಽᏓࠍ Fig.7 ߦ␜ߔ‫ޕ‬㧔a㧕࿑߆ࠄ㧔c㧕࿑߹ߢࠍᲧセߔࠆߣ㧘ᵹ㊂߇ᄢ߈ߊߥߞߡ᳚Ửේߩ᳓ᷓ߇ᄢ߈ߊߥࠆ߶ߤ਄᣹ᵹߣᴉߺㄟ

㧔b㧕㧰r㧩0.17ߺ߇ᒝߊߥࠆߎߣ߇ࠊ߆ࠆ‫ޕ‬ḧᦛ㗂ὐߩᴡ㆏᏷߇ EO ߩ᳓〝ߦ߅޿ߡ㧘᳚Ửේߩ᳓ᷓࠍ㧟ㅢࠅߦᄌൻߐߖߚ႐วߩ⴫㕙ߩ⊒ᢔಽᏓࠍFig.8 ߦ␜ߔ‫ޕ‬㧔a㧕࿑߆ࠄ㧔c㧕࿑߹ߢࠍᲧセߔࠆߣ㧘ᵹ㊂߇ᄢ߈ߊߥߞߡ᳚Ửේߩ᳓ᷓ߇ᄢ߈ߊߥࠆ߶ߤ਄᣹ᵹߣᴉߺㄟߺ߇ᒝߊߥࠆߎߣ߇ࠊ߆ࠆ‫ޕ‬એ਄ߩ⠨ኤ߆ࠄ㧘ᴡ㆏߆ࠄ᳚Ửߔࠆࠃ߁ߥᵹ㊂ࠍਈ߃ߚ႐วߦߪ㧘޿ߕࠇߩ᳓〝ߦ߅޿ߡ߽㧘ᵹ㊂߇ᄢ߈ߊߥߞߡ᳚Ửේߩ᳓ᷓ߇ᄢ߈ߊߥࠆ߶ߤ਄᣹ᵹߣᴉߺ

㧔c㧕㧰r㧩0.31ㄟߺ߇ᒝߊߥࠆߣ⸒߃ࠆ‫߇ࠈߎߣޕ‬㧘ḧᦛ㗂ὐߩᴡ㆏᏷߇ EO ߩ᳓〝ߦ߅޿ߡᴡ㆏ḩ᧰ᵹ㊂ࠍᵹߒߚ႐วߦߪ㧘․೎ߥᵹᴫ߇⊒↢ߒߡ߅ࠅ㧘ߎߩ႐วߩ਄᣹ᵹߣᴉߺㄟߺߩᒝߐߪ㧘ᴡ㆏᏷߇৻᭽ߥ᳓〝ߣḧᦛ㗂ὐߩᴡ㆏᏷߇ EO ߩ᳓〝ߦ߅޿ߡ਄᣹ᵹߣᴉߺㄟߺ߇
ᦨ߽ᒝߊߥࠆ㧰T㧩 ߩ႐วߩ਄᣹ᵹߣᴉߺㄟߺߩ
ᒝߐߣห⒟ᐲߢ޽ࠆߎߣ߇ᵈ⋡ߐࠇࠆ‫ޕ‬ ᳓㕙ᒻ⁁ߩ․ᓽ

ḧᦛ㗂ὐߩᴡ㆏᏷߇ EO ߅ࠃ߮ᴡ㆏᏷߇৻᭽ߥ᳓〝ߦ߅޿ߡ㧘㧰T㧩 ߩ႐วߩ᳓ᷓಽᏓࠍ Fig.9 ߦ␜－ 687 －㧔d㧕㧰r㧩0.45
Fig.6

Divergence in narrow channelᴡ㆏߆ࠄᵹࠇ߇᳚Ửߔࠆ᧦ઙߩਅߢߪ㧘ḧᦛㇱߩ਄ᵹ એ਄ߩ⠨ኤ߆ࠄ㧘⼱ᐩᐔ㊁ߦ߅޿ߡⰬⴕᴡ㆏߆ࠄ᳚஥ߢᴡ㆏߆ࠄᐔ࿾ߦਸ਼ࠅ਄ߍࠆ਄᣹ᵹߦࠃߞߡ᳓㕙߇Ửߔࠆᵹࠇߪ㧘᳓ᷓߩಽᏓߦᴡ㆏ߩᒻ⁁ߦኻᔕߔࠆ๟

਄᣹ߒߡ᳓ᷓ߇ዪㇱ⊛ߦᄢ߈ߊߥࠆߣ⠨߃ࠄࠇࠆ‫ޕ‬ᦼ⊛ߥᄌൻࠍਈ߃㧘ߘߩ⚿ᨐߣߒߡ᳓㕙൨㈩߇ᐔ࿾਄ ߐࠄߦ㧘ߎࠇࠄߩ࿑ߦኻᔕߔࠆ⴫㕙ᵹㅦߩಽᏓ࿑ߩߢዪㇱ⊛ߦᄢ߈ߊߥࠆߚ߼㧘ᵹㅦ߽ᄢ߈ߊߥࠅ㧘ㄘ࿾

Fig.4㧔a㧕࿑߅ࠃ߮ Fig.2㧔b㧕࿑ߦ߅޿ߡߪ㧘᳓ᷓ߇ᄢߩᵞជߥߤߩⵍኂࠍ⊒↢ߐߖࠆജ߇੍ᗐએ਄ߦᄢ߈ߊ

߈޿႐ᚲߩਅᵹ஥ߦ߅޿ߡ᳚Ửᵹߩ⴫㕙ᵹㅦ߇ᄢ߈ߊߥࠆߣ⠨߃ࠄࠇࠆ‫ޕ‬ߥߞߡ޿ࠆߎߣ߇ࠊ߆ࠆ‫ߜࠊߥߔޕ‬㧘᳚Ửᵹߩᵹㅦߪ㧘 ߹ߚ㧘ḧᦛ㗂ὐߩᴡ㆏᏷߇ EO ߩ᳓〝ߦ߅޿ߡᴡ㆏

ᵹ㊂ߩᄢ߈ߐߛߌߢߪߥߊ㧘᳓㕙൨㈩ߦࠃߞߡ߽ᄢ߈

ḩ᧰ᵹ㊂ࠍᵹߒߚ႐วߦ⊒↢ߒߚ․೎ߥᵹᴫߪ㧘᳚Ửߥᓇ㗀ࠍฃߌࠆߣ⠨߃ࠄࠇࠆ‫੹ޕ‬㧘᳓ᷓ߇ᄢ߈޿႐ᚲᵹߩ᳓㕙൨㈩߇ᄢ߈ߊߥߞߚߚ߼ߦ↢ߓߚ߽ߩߣ⠨߃ߩਅᵹ஥ߩᐔ࿾਄ߩ᳚Ửᵹߩዪᚲ⊛ߥ᳓㕙൨㈩ࠍ⸘▚ࠄࠇࠆ‫ߜࠊߥߔޕ‬㧘Fig.6㧔a㧕࿑ߦ߅޿ߡ㧘ᴡ㆏ḩ᧰ߔࠆߣ㧘ḧᦛ㗂ὐߩᴡ㆏᏷߇ EO ߩ႐วߩ Fig.9㧔a㧕

ᵹ㊂ࠍᵹߒߚ႐วߦߪᴡ㆏ߩ⁜⓰ㇱߩ਄ᵹ஥߆ࠄ᳚Ử࿑ߢߪ⚂ 㧘ᴡ㆏᏷߇৻᭽ߥ᳓〝ߩ႐วߩ Fig.9㧔b㧕ߔࠆᵹࠇߦᒝ޿਄᣹ᵹ߇⊒↢ߔࠆߎߣࠍᜰ៰ߒߚ߇㧘࿑ߢߪ⚂  ߣߥࠆ‫ߩࠄࠇߎޕ‬൨㈩ߪ㧘ታ㛎᳓〝ߩߎߩߚ߼ߦ᳚Ửේߩ਄ᵹ஥ߩ᳓ᷓ߇ᄢ߈ߊߥࠆߣផኤ

൨㈩ߩ  ࠃࠅ߆ߥࠅᄢ߈޿ߎߣ߇ᵈ⋡ߐࠇࠆ‫ޕ‬ߐࠇࠆ‫৻ޕ‬ᣇ㧘ߎߎߢ᳚Ửߒߚᵹࠇߪਅᵹߩᴡ㆏ߦᚯ








㧔a㧕㧰r㧩0.17㧔a㧕㧰r㧩0.17㧔b㧕㧰r㧩0.31

      㧔b㧕㧰r㧩0.31







㧔c㧕㧰r㧩0.45
Fig.7

㧔c㧕㧰r㧩0.45

Divergence in uniform channel

Fig.8－ 688 －Divergence in wide channelࠆ߇㧘Fig.3㧔a㧕࿑ߦ⷗ࠄࠇࠆࠃ߁ߦ㧘ߘࠇࠃࠅਅᵹ
ߢߪᵹࠇߪᴡ㆏ౝߦ෼߹ߞߡ޿ࠆߩߢ㧘ਅᵹߢᴡ㆏ߦᚯࠆᵹࠇߩ᳓ᷓߪዊߐߊߥࠆߣ⠨߃ࠄࠇࠆ‫ߞ߇ߚߒޕ‬ߡ㧘ߎߩ႐วߦ߽᳚Ửᵹߩ᳓㕙൨㈩߇ᄢ߈ߊߥࠆߚ߼
ߦ㧘᳚Ửᵹߩᵹㅦ߇੍ᗐએ਄ߦᄢ߈ߊߥߞߚߣ⠨߃ࠄ

1.5ࠇࠆ‫ޕ‬ḧᦛ㗂ὐߩᴡ㆏᏷߇ EO ߩ᳓〝ߦ߅޿ߡᴡ㆏ḩ᧰ᵹ㊂ࠍᵹߒߚ႐วߩᐔ࿾਄ߩ᳚Ửᵹߩዪᚲ⊛ߥ᳓㕙     㧔a㧕Narrow channel

൨㈩ࠍ⸘▚ߔࠆߣ㧘ߘࠇߪ⚂  ߢ޽ߞߚ‫ޕ‬

1.0㧠 ⚿ ⺆ ⪺⠪ࠄ߇⺞ᩏߒߚ  ᐕߩ૛╣Ꮉᵹၞߩ᳓ኂߣ

0.5 ᐕߩ⿷⠀Ꮉߩጊ࿾ᵹၞߩ᳓ኂߢߪ㧘ᄢⷙᮨߥ᳚Ử߇߭߈⿠ߎߐࠇߡ㧘ᴡ㆏ḧᦛㇱߦ߅޿ߡỗ↟ߥⵍኂ߇⊒↢ߒߚ߇㧘ἴኂᤨߩᵹᴫߣⵍኂߩ⊒↢ߣߩ㑐ଥࠍ⸃㧔b㧕uniform channel᣿ߔࠆߚ߼ߦ᳓ℂታ㛎ࠍⴕߞߚ‫ᧄޕ‬ᐕᐲⴕߞߚታ㛎ߪታ㛎ᣇᴺߦ߅޿ߡㅀߴߚో૕ߩታ㛎⸘↹ߩ৻ㇱߢ޽ࠆ

Fig.9 The distribution of water depth in shallow depth߇㧘ᧄ⎇ⓥߦࠃߞߡએਅߩߎߣ߇᣿ࠄ߆ߦߥߞߚ‫ޕ‬

condition㧔㧰r㧩0.17㧕㧕ḧᦛㇱߩᴡ㆏᏷߇ዊߐ޿߶ߤ㧘᳚Ửߔࠆᵹ㊂߇ᄢ߈ߊߥࠆߣหᤨߦ㧘᳚ỬᵹߩਥᵹߩⰬⴕ߇ዊߐߊߥࠆ‫ޕ‬㗔ၞߩᐔ࿾ࠍૐߊߔࠆ႐ว㧘ᐔ࿾ߩ൨㈩ࠍዊߐߊߔࠆ

㧕ᵹ㊂߇ᄢ߈ߊߥߞߡ᳚Ửߔࠆᵹ㊂߇ᄢ߈ߊߥࠆ߶ߤ㧘႐วߦߟ޿ߡ߽㧘ታ㛎⊛ᬌ⸛ࠍⴕ߁੍ቯߢ޽ࠆ‫ޕ‬᳚Ửᵹߩᵹㅦ߇ᄢ߈ߊߥࠆߣหᤨߦ㧘᳚Ửᵹߩਥᵹߩෳ⠨ᢥ₂Ⱜⴕ߇ዊߐߊߥࠅ㧘᳚Ửᵹ߇⼱ߩਅᵹߦะ߆ߞߡ⋥ㅴ⊛ߦᵹਅߔࠆ‫ޕ‬ એ਄ߩ⚿ᨐߪ㧘ᒰὼ੍ᗐߢ߈ࠆߎߣߢ޽ࠆ‫⎇ᧄޕ‬ⓥદ⮮๺ౖ࡮㗇⾐ႌਃ࡮⨃ᧁା␽࡮ᳰ↰⵨৻㧔㧕㧦ᐔߢᜰ៰ߒߚ޿ߎߣߪ㧘ታ㛎⊛ᬌ⸛ߦࠃߞߡጊ࿾ᴡᎹߩᚑ  ᐕ  ᦬ᧃߩ㇊㗇಴᳓ߦࠃࠆ૛╣Ꮉߩᵹ〝ᄌൻߩ᳓ኂߦ㑐ߒߡ㧘એਅߦㅀߴࠆࠃ߁ߥᣂߚߥ⍮⷗߇ᓧࠄ․ᕈ㧘᳓Ꮏቇ⺰ᢥ㓸㧘╙  Ꮞ㧘RRࠇߚߎߣߢ޽ࠆ‫ޕ‬દ⮮๺ౖ࡮㗇⾐ႌਃ࡮ᳰ↰⵨৻㧔㧕㧦૛╣Ꮉߦߺࠆ㧕⼱ᐩᐔ㊁ߦ߅޿ߡⰬⴕᴡ㆏߆ࠄ᳚Ửߔࠆᵹࠇߪ㧘᳓ૐ㗫ᐲᄢᵩ᳓ߦࠃࠆᮮଚ㘩ᕈᴡ㆏ᄌൻߩታᘒߣߘߩ

㕙൨㈩߇ᐔ࿾਄ߢዪㇱ⊛ߦᄢ߈ߊߥࠆߚ߼㧘ᵹㅦ߽ᄢ⠨ኤ㧘᳓Ꮏቇ⺰ᢥ㓸㧘╙  Ꮞ㧘RR

߈ߊߥࠅ㧘ㄘ࿾ߩᵞជߥߤߩⵍኂࠍ⊒↢ߐߖࠆജ߇੍਄㊁㋕↵㧔㧕㧦૛╣Ꮉߩ  ᐕ  ᦬᳓ኂߣᴦ᳓ኻᗐએ਄ߦᄢ߈ߊߥࠆ‫ޕ‬╷ߦߟ޿ߡ㧘੩ㇺᄢቇ㒐ἴ⎇ⓥᚲᐕႎ㧘╙  ภ㧮㧘㧕ḧᦛㇱߩᴡ㆏᏷߇ዊߐ޿႐วߦߪ㧘ᵩ᳓ߩ᳚Ử߇ᆎ

RR

߹ߞߚ⋥ᓟ߆ࠄᵹㅦ߇ᄢ߈޿ᵹࠇ߇ᐔ࿾ߦ᛼ߒነߖࠆ

਄㊁㋕↵㧔㧕㧦૛╣Ꮉᵹၞߩ  ᐕ  ᦬᳓ኂߩ⎇ߚ߼ߦ㧘ㄘ࿾ߩᵞជߥߤߩⵍኂ߇੍ᗐએ਄ߦᄢ߈ߊߥⓥ 㧘 ੩ ㇺ ᄢ ቇ 㒐 ἴ ⎇ ⓥ ᚲ ᐕ ႎ 㧘 ╙  ภ 㧮 㧘ࠆ‫ޕ‬RR એ਄ߩ⍮⷗ߦၮߠߊߣ㧘ᄢᵩ᳓߇⊒↢ߔࠆ႐วߦ㧘਄㊁㋕↵࡮⍹၂ᵏテ㧔㧕㧦⿷⠀Ꮉጊ࿾ᵹၞߦ߅ߌࠆጊ࿾ᴡᎹߩ᳓ኂࠍシᷫߔࠆߚ߼ߦߪ㧘ḧᦛㇱߩᴡ㆏᏷ ᐕ᳓ኂߦߟ޿ߡ㧘੩ㇺᄢቇ㒐ἴ⎇ⓥᚲᐕႎ㧘╙ࠍ⋥✢ㇱࠃࠅ߽ᄢ߈ߊߔࠆߎߣ߇㊀ⷐߢ޽ࠆߣ⸒߃ࠆ‫ޕ‬⸘↹ⷙᮨࠃࠅዊߐ޿ᵩ᳓߇⊒↢ߔࠆ႐วߦ߽㧘ḧᦛㇱ ภ㧮㧘RR
਄㊁㋕↵㧦૛╣Ꮉᵹၞߩ  ᐕ᳓ኂߩ⊒↢᭴ㅧߦߟ޿ߩᴡ㆏᏷߇ᄢ߈޿ᣇ߇ᅢ߹ߒ޿ᵹᴫߦߥࠆߎߣ߇ᧄታߡ㧔㧕㧘⥄ὼἴኂ⑼ቇ㧘8QN㧘0Q㧘RR㛎ߦࠃߞߡ᣿ࠄ߆ߦߐࠇߡ޿ࠆ‫ߒߛߚޕ‬㧘ߎߩࠃ߁ߥቝᴦᯅᐽⴕ࡮ᐢㇱ⧷৻㧔㧕㧦㧔ᐔᚑ 㧕ᐕ ႐วߦߪᴡ㆏ߩḧᦛㇱߩౝጯ஥ߦߪ࿯⍾␕߇ၸⓍߒ߿᦬⑔੗⽕㔎ἴኂߩㅦႎ㧘࿯ᧁቇળ⹹㧘╙  Ꮞ╙ ߔ޿ߩߢ㧘ᴡᎹߩ⛽ᜬ▤ℂߦദ߼ࠆᔅⷐ߇޽ࠆ‫ޕ‬ภ㧘RR ੹ᓟ㧘ᧄ⎇ⓥߢⴕߞߚታ㛎᧦ઙߩ߁ߜ․ᓽ⊛ߥᵹᴫᩙጊථ਽࡮Ꮉญᐢม࡮ᧃᰴᔘม࡮ᣣਅㇱ㓉ᤘ࡮ᦨ਄⼱߇⊒↢ߔࠆ᧦ઙࠍ᛽಴ߒߡ㧘㔚⏛ᵹㅦ⸘ࠍ↪޿ߡౝㇱศೣ㧔㧕㧦ᐔᚑ  ᐕ૛╣Ꮉᵩ᳓ߦࠃࠆ࿖㆏  ภߩਃᰴరᵹᴫࠍ⸘᷹ߔࠆ੍ቯߢ޽ࠆ‫ߚ߹ޕ‬㧘࿾ᒻ⊛᧦ᯅ᪞਄ਅᵹߩᴡᐥᄌേߣᴡጯଚ㘩㧘᳓Ꮏቇ⺰ᢥ㓸㧘ઙࠍᄌൻߐߖࠆߎߣߦࠃࠅ㧘ḧᦛᴡ㆏ߩౝጯ஥ߩᏪ⁁╙  Ꮞ㧘RR

－ 689 －ዊ㜞⁴ม࡮ጟੑਃ↢࡮ᮮ↰ༀᒄ࡮┥↰ዏᏗ࡮ⷺධ ㅴㄞᧄື㇢࡮੗਄๺਽㧔㧕㧦บ㘑 㨪 ภߦࠃࠆ⽕㧔㧕㧦ᴡᎹ਄ᵹㇱߩⵍኂ㧘ᐔᚑ  ᐕ  ᦬⑔੗⽕㔎ἴኂ✕ᕆ⺞ᩏ㧔ㅦႎ㧕㧘࿯ᧁቇળ⹹㧘╙  Ꮞ╙ ภ㧘RR㔎ߦࠃࠆ࿾⋚ἴኂ⺞ᩏႎ๔ᦠ㧘RRዊ᧻೑శ࡮᛼Ꮉ⧷ᄦ㧔㧕㧦㧞㧜㧜㧢ᐕ㧣᦬⽕㔎ߦࠃਛᎹ ৻࡮㜞ᯅ ଻࡮㉿ᷓᅢᢥ㧔㧕㧦 ᐕᵩ᳓ࠆ਻Ꮊධㇱߩⵍኂ╬ߦߟ޿ߡ㧔ㅦႎ㧕㧘࿯ᧁቇળ⹹㧘ߦࠃࠆ㇊⃗Ꮉ᳓♽૛╣Ꮉߩᴡ㆏ᄌേߦߟ޿ߡ㧘᳓Ꮏቇ⺰ᢥ㓸㧘╙  Ꮞ㧘RR╙  Ꮞ╙  ภ㧘RR
ዊ᧻೑శ࡮᛼Ꮉ⧷ᄦ࡮ᯅᧄᓆඳ㧔㧕㧦ᐔᚑ  ᐕ 㚍႐ᐽਯ࡮੗਄๺਽࡮ᚭ↰࿻৻࡮ਛᎹ ৻࡮⍹၂ᵏテ࡮᦬⽕㔎ߦࠃࠆ਻Ꮊߩἴኂߩ․ᓽߣ੹ᓟߩ⺖㗴㧘ᐔᚑศ↰⟵ೣ㧔㧕㧦บ㘑  ภߦࠃࠆ↱⦟Ꮉᵹၞߩ ᐕᐲᴡᎹἴኂߦ㑐ߔࠆࠪࡦࡐࠫ࠙ࡓ㧘RR

᳓ኂߦ㑐ߔࠆ⺞ᩏႎ๔㧘੩ㇺᄢቇ㒐ἴ⎇ⓥᚲᐕႎ㧘╙  ภ㧮㧘RR

૒⮮ᾖሶ㧔㧕㧦 ᐕ  ᦬㇊⃗Ꮉ᳓ኂߩⵍኂߣ࿯
࿾ⅣႺ㧘ਥⷐἴኂ⺞ᩏ╙  ภ ർ㑐᧲࡮ධ᧲ർ࿾ᣇ

㐳⼱Ꮉ๺⟵㧔㧕㧦ᐔᚑ  ᐕบ㘑  ภߦࠃࠆർᶏ㆏ ᐕ  ᦬  ᣣ㨪 ᣣ⽕㔎ἴኂ⺞ᩏႎ๔㧘㒐ἴ⑼⽕㔎ἴኂߩ᭎ⷐߣ․ᓽ㧘ᐔᚑ  ᐕᐲᴡᎹἴኂߦ㑐ߔቇᛛⴚ⎇ⓥᚲ㧘RRࠆࠪࡦࡐࠫ࠙ࡓ㧘RR


Experimental Study on the Extensive Flooding in Mountainous River

Tetsuo UENO, Taisuke ISHIGAKI㧖, Kazuhiko HATTORI㧖㧖, Satoshi YAMADA㧖㧖㧖
and Ryuji KAWANAKA㧖㧖㧖㧖㧖

Faculty of Engineering, Kansai University
Graduate School of Engineering, Kansai University㧖㧖㧖
Daitetsu Kogyo

SynopsisSevere flood disasters due to heavy rainfall occurred in the Yosasa River basin on August 27, 1998 and inthe Asuwa River basin on July 18, 2004. On the basis of the field survey and aerial photographs taken before
and after the flood, it had been cleared that the damage due to flooding was related to the width of curved river
channels and the configuration of flood plains in valley. We investigated the characteristics of the extensive
flooding under various conditions in the experimental channel. The water surface velocity, vorticity,
divergence and water surface profile were measured.
Keywords: mountainous river, flood disaster, hydraulic experiment, extensive flooding, meandering river－ 690 －