࿦จՏ઒ٕज़࿦จू, ୈ 27 ‫ר‬, 2021 ೥ 6 ݄࠭भՏ઒ͷ‫ݥة‬Օॴͷෳ૚తਪఆ๏ͷߏங
DEVELOPMENT OF A MULTI-LAYERED ESTIMATION METHOD FORDANGEROUS SECTION IN SAND BAR RIVERS

ੴ௩๕ 1 ɾੴ‫ݪ‬ಓल 2 ɾ҆ాߒอ 3
Kaori ISHIZUKA, Michihide ISHIHARA and Hiroyasu YASUDA
1 ਖ਼ձһ म࢜ (޻ֶ) ‫ࣜג‬ձࣾ౦‫ݐژ‬ઃίϯαϧλϯτ

ʢ˟ 170-0004 ౦‫౎ژ‬๛ౡ۠๺େ௩ 1-15-6 ‫ڀݚ‬౰࣌:৽ׁେֶେֶӃ ࣗવՊֶ‫ڀݚ‬Պʣ2 ֶੜձһ म࢜ (޻ֶ) ৽ׁେֶେֶӃ ࣗવՊֶ‫ڀݚ‬Պʢ˟ 950-2102 ৽ׁ‫ࢢׁ৽ݝ‬੢۠‫ेޒ‬ཛྷೋͷொ 8050ʣ
3 ਖ਼ձһ ത࢜ (޻ֶ) ৽ׁେֶ‫ڭڀݚ‬त ‫ڀݚ‬ਪਐ‫ߏػ‬ʢ˟ 950-2102 ৽ׁ‫ࢢׁ৽ݝ‬੢۠‫ेޒ‬ཛྷೋͷொ 8050ʣ

In this study, we attempted to construct a method for estimating dangerous areas in bar rivers
from two-layered perspectives, global and local. First, it was found that by using the riverbed wave
classification based on the water depth wavelength ratio, which is a global estimation method, it ispossible to grasp high-risk sections such as riverbank defects and erosion breach in the entire river.
Next, the energy accumulation method focusing on the deviation of the friction velocity, which isa local estimation method, was used to estimate the locations where riverbank defects and erosion
breach could occur in the above-mentioned section. As a result, it was found that the estimation
accuracy is high when the water route and the topography as bars in the river channel can besufficiently reflected in the the estimation method
Key Words: multi-layered estimation method, flood risk management, channel evolution, riverbank erosion, alternate bars, iRIC

1. ͸͡Ίʹܽ೗ͷ໰୊ղফͷ‫ݟ‬௨͠͸ཱ͖͍ͬͯͯΔɽɹ·ͨɼߑਫ࣌ͷՏಓม‫ܗ‬ͷൃੜΛ؆ศʹਪఆ͢Δํਓ‫ॅډޱ‬஍͕ଟ͍தྲྀҬͰ͸Տচ͕ଯੵͱચ۷Λ‫܁‬๏ͱͯ͠ɼஶऀͷҰਓ͸ɼඍখৼ෯೾ཧ࿦ʹ͓͍ͯԖ௚Γฦ࠭͢भ͕໌ྎʹൃୡ͍ͯ͠Δ͜ͱ͕ଟ͍ɽۙ೥ʹํ޲ͷྲྀମӡಈͷ‫ن‬໛Λ‫ن‬ఆ͢Δਫਂ೾௕ൺΛ༻͍ΔͳΓɼ͜Ε͕ߑਫྲྀΛภ৺ͤ͞ɼՏ‫ܽ؛‬ଛ΍Տදଆ͔͜ͱΛఏҊ͍ͯ͠Δ6) ɽਫਂ೾௕ൺͷࢉग़͸ΤωϧΪʔΒͷఅମͷ৵৯͕ͨͼͨͼൃੜ͍ͯ͠Δ1) ɽ͔͠͠ɼஶूੵ๏ͱҟͳΓɼҰ࣍‫ݩ‬ͷਫཧ‫ʹࢉܭ‬Αͬͯ؆ศʹࢉऀΒͷ஌Δ‫ݶ‬Γɼ͜ͷΑ͏ͳ࠭भՏ઒ʹ͓͚ΔՏ‫ܽ؛‬ఆͰ͖Δͷ͕ಛ௃Ͱ͋Δɽଛ΍అମ৵৯ʹࢸΔΑ͏ͳ‫ݥة‬Օॴͷਪఆ๏͸ະཱ֬ɹ্ड़ͷ௨ΓɼஶऀΒ͸‫ݪ‬ཧͷҟͳΔ̎छྨͷ࠭भՏͷΑ͏Ͱ͋Δɽ઒ͷ‫ݥة‬Օॴͷਪఆ๏Λ։ൃ͍ͯ͠Δɽ྆ਪఆ๏ͷओɹ্‫ه‬ͷՏ‫ܽ؛‬ଛ΍৵৯ഁఅΛ༧๷͢ΔͨΊɼஶऀΒ͸ͳ૬ҧ఺͸ɼਪఆʹཁ͢Δ‫ࢉܭ‬ෛՙͰ͋Δɽਫਂ೾௕ൺΤωϧΪʔूੵ๏2),3),4),5) ͱশ͢ΔྲྀΕͷΤωϧΪʔʹ‫ͮ͘ج‬ਪఆ๏͸ɼΤωϧΪʔूੵ๏ʹൺ΂ͯ‫ࢉܭ‬ෛͷภࠩʹΑΓ‫ݥة‬ՕॴΛਪఆ͢Δख๏Λ։ൃ͖ͯͨ͠ɽՙ͕খ͍͞ɽ྆ਪఆ๏ͷಛੑΛ౿·͑Δͱɼඪߴσʔෳ਺ͷՏ઒ʹରͯ͠ΤωϧΪʔूੵ๏Λద༻͠ɼ͍ͣλͳͲ͕๡͍͠Տ઒ʹ͓͚Δ‫ݥة‬ՕॴͷਪఆͷखॱΛΕͷՏ઒ͷ‫ݥة‬Օॴ΋ྑ޷ʹਪఆͰ͖Δ͜ͱΛࣔͯ͠ҎԼͷΑ͏ʹߟ͑Δ͜ͱ͕Ͱ͖Δɽ·ͣɼ؆ศʹࢉఆͰ͍ΔɽΤωϧΪʔूੵ๏Λద༻͢ΔͨΊʹ͸ฏ໘ೋ͖࣍Δਫਂ೾௕ൺΛ༻͍ͯߑਫ࣌ʹՏಓม‫ܗ‬ͷ‫ݥة‬ੑ͕‫ݩ‬ͷਫཧ‫͕ࢉܭ‬ඞཁͰ͋Δɽ‫Ͳͳݝ‬ͷ࣏ࣗମ͕؅ཧٙ͢ΘΕΔ۠ؒશମΛ၆ᛌతʹධՁ͢Δɽ࣍ʹɼਫਂ೾ΔՏ઒ͷ૯Ԇ௕͸ 9 ສ km ‫͕Ϳٴʹڧ‬ɼ͜ΕΒͷՏ઒௕ൺʹ‫ߑ͖ͮج‬ਫ࣌ʹՏಓม‫ͳʹൃ׆͕ܗ‬ΔՄೳੑ͕Ͱ͸ɼਫཧ‫Ͱࢉܭ‬ඞཁͱͳΔՏಓͷඪߴσʔλͱਫจߴ͍۠ؒΛର৅ͱ͠ɼUAV ͳͲͰ‫ݶ‬ఆతʹ DEM σʔσʔλͷͲͪΒ΋๡͍͠ɽҰํͰɼۙ೥Ͱ͸ɼUAV ͕λΛऔಘ্ͨ͠ͰΤωϧΪʔूੵ๏ʹΑΓ‫ݥة‬ੑͷߴී‫ݸ͖ͯͯ͠ٴ‬ਓϨϕϧͰ΋ͦΕ΄Ͳ޿ൣғͰͳ͚Ε͍ՕॴΛਪఆ͢Δෳ૚తͳਪఆ๏͕ߟ͑ΒΕΔɽ

͹ DEM σʔλͷऔಘ͕ՄೳͱͳΓɼਫཧ‫ʹࢉܭ‬ඞཁɹɹຊ‫Ͱڀݚ‬͸ɼ্‫ه‬ͷ 2 ख๏ͷ૊Έ߹ΘͤʹΑΓಛͱͳΔσʔλͷ͏ͪɼ‫͍༻ʹࢠ֨ࢉܭ‬Δඪߴσʔλͷʹ࠭भՏ઒ʹ͓͚ΔՏ‫ܽ؛‬ଛ΍అମ৵৯ͷ‫ݥة‬ੑΛෳ໘ೋ࣍‫ݩ‬ͷਫཧղੳʹΑΓࢉग़ͨ͠ຎࡲ଎౓͕Տಓ಺૚తʹਪఆ͢Δख๏ʹ͍ͭͯ࿦͡Δɽ·ͨɼຊ‫Ͱڀݚ‬ͷ‫ݥة‬Օॴͷ༧ଌࢦඪͱͳΔՄೳੑΛ͍ࣔͯ͠Δɽ·͸ɼΤωϧΪʔूੵ๏ͱਫਂ೾௕ൺͷద༻ʹ౰ͨͬͯඞͨɼॏࢬΒ3) ΋඙ࢁ઒Ͱͷ‫؛ޢ‬ඃࡂͷઆ໌ม਺ͱͯ͠ཁͱͳΔσʔλͷղ૾౓ɼछྨ͕ҟͳΔՏ઒Ͱ΋ಉ༷ຎࡲ଎౓͕༗ޮͰ͋Δ͜ͱΛใࠂ͍ͯ͠Δɽ্‫ه‬Λྫͷ݁Ռ͕ಘΒΕΔ͔ʹ͍ͭͯɼೳੜ઒ͱ‫ڕ‬໺઒ͷ 2 ͭͱͨ͠‫ڀݚ‬Ҏ֎ʹ΋ଞͷ࣮Տ઒ʹ͓͍ͯಉ༷ͷ‫ূݕ‬4),5)Տ઒Λର৅ͱͯ͠‫ͨ͠ূݕ‬ɽ͕ߦΘΕ͓ͯΓɼͦͷ༗ޮੑ͕֬ೝ͞Ε͍ͯΔɽຊ‫ݚ‬‫Ͱڀ‬͸ຎࡲ଎౓Λࢦඪͱͨ͠‫ݥة‬Օॴͷਪఆख๏ΛΤ

2.

‫ݥة‬Օॴͷਪఆख๏ωϧΪʔूੵ๏ͱ‫ݺ‬শ͍ͯ͠Δɽຊ‫͍༻Ͱڀݚ‬ΔΤωϧΪʔूੵ๏ͷ۩ମతͳํ๏͸ɼฏ໘ೋ࣍‫ݩ‬ͷਫཧղຊ‫Ͱڀݚ‬͸ɼਫਂ೾௕ൺΛ༻͍Δਪఆ๏Λେ‫ہ‬తͳੳΑΓಘΒΕͨର৅۠ؒͷՏಓ಺ͷຎࡲ଎౓ͷภࠩΛࢹ఺Ͱͷਪఆ๏ɼΤωϧΪʔूੵ๏Λ༻͍Δਪఆ๏Λࢉग़͠ɼՏಓͷ‫؛ޢ‬ͷ‫͕౓ڧ‬౳ྲྀͷਫཧྔʹ‫͍ͯͮج‬‫ॴہ‬తͳࢹ఺Ͱͷਪఆ๏ͱ֤ͯ͠ʑΛҐஔ෇͚Δ͜ͱܾఆ͞ΕΔ͜ͱʹண໨͠ɼՏಓ಺ͷຎࡲ଎౓ͷฏ‫ۉ‬஋ͱͨ͠ɽ྆ਪఆ๏ͷ֓ཁ͸ҎԼͷ௨ΓͰ͋ΔɽΑΓ 1σ Ҏ্େ͖͍ՕॴΛ‫ݥة‬Օॴͱ͢Δ΋ͷͰ͋ΔɽɹલઅͰड़΂ͨਫਂ೾௕ൺ͸ɼେ‫ہ‬తͳ‫͔఺؍‬ΒՏಓ

(1)ਫਂ೾௕ൺͷ࣋ͭੜདྷతͳੑ࣭Λ೺Ѳ͠ɼՏಓม‫ܗ‬ͷ‫ݥة‬ੑΛ೺Տ‫ܽ؛‬ଛ΍৵৯ഁఅͷཁҼͱͳΔ࠭भͷൃੜͷ༗ແѲ͢Δख๏Ͱ͋ΔɽͦͷͨΊɼՏಓ಺ͷͲͷՕॴͰՏ͸ɼՏচ໘ͷ҆ఆੑղੳʹΑͬͯ઒෯ਫਂൺ͕ࢧ഑త‫ܽ؛‬ଛ΍৵৯ഁఅ͕ൃੜ͠͏Δͷ͔ɼ‫ॴہ‬తͳਪఆ͸ͳύϥϝʔλͰ͋Δ͜ͱ͕ཧ࿦తʹࣔ͞Ε͍ͯΔ7),8) ɽ೉͍͠ɽͦ͜ͰɼΤωϧΪʔूੵ๏Λ༻͍ɼ্‫ه‬ͷ‫ہ‬ࠃ಺Ͱ͸ࠇ໦ɾ‫͕؛‬ఏҊͨ͠ྖҬ۠෼ਤ͕ස༻͞ΕɼՏॴతͳਪఆΛߦ͏ɽ઒ͷେ‫ہ‬తͳੑ࣭Λཧղ͢Δͷʹ༗༻ͳࢦඪͱ͞Ε͍ͯΔɽ઒෯ਫਂൺ͕࠭भͷൃੜͷ༗ແʹਂؔ͘܎͢Δ3.

ର৅Տ઒͜ͱ͕ࣔ͞Ε͍ͯΔ͕ɼྲྀମྗֶతͳ‫͔఺؍‬Β྆ऀͷຊ‫Ͱڀݚ‬͸ɼඃࡂ࣮੷ͷ͋Δ‫ڕ‬໺઒ͱೳੜ઒ͷ 2 Տؔ܎ʹ͍ͭͯ໌ྎʹઆ໌͞Ε͍ͯͳ͍ɽͦͷͨΊɼର৅Տ઒ΛྖҬ۠෼ਤͰ෼ྨͨ͠ͱͯ͠΋ͦͷ෺ཧతͳղऍ͕೉͍͠ɽɹۙ೥ɼஶऀΒͷ‫ڀݚ‬άϧʔϓͰ͸ඍখৼ෯೾ཧ࿦ʹ͓͚Δ෼ࢄؔ܎ࣜΛ༻͍ɼ࠭भͷଞʹ࠭ଯ΍࠭࿂ͳͲ઒Λର৅ͱ͠ɼ্ड़ͨ͠ 2 ͭͷਪఆ๏Λෳ૚తʹద༻ͨ͠৔߹ͷ༗ޮੑʹ͍ͭͯ‫ͨ͠ূݕ‬ɽຊষͰ͸ର৅Տ઒ʹ͓͚Δඃࡂ֓ཁͱର৅۠ؒʹ͍ͭͯઆ໌͢ΔɽͷՏচ೾ͷൃੜ΍ଘࡏͷ༗ແʹ͍ͭͯ౷Ұతʹ۠෼Ͱ

(1)‫ڕ‬໺઒͖Δ͜ͱΛ໌Β͔ʹ͍ͯ͠Δ6) ɽਤ–1 ͷ a) ʹਫਂ೾௕a)ඃࡂ֓ཁൺͷ۠෼ਤΛࣔ͢ɽ͜ͷ۠෼๏͸ඍখৼ෯೾ཧ࿦ͱͷ‫ڕ‬໺઒͸৽ׁ‫܈ͱݝ‬അ‫ݝ‬ͷ‫ڥݝ‬ͷ୩઒ַ੢࿢Ұମʹద߹ੑͷ౎߹ʹΑΓɼԣ࣠Λ઒෯ਫਂൺͱ‫਺ٯ‬ͷؔ܎୺Λൃ͠ɼ৽ׁ‫ݝ‬ͷ‫ڕ‬প஍ํΛ؏ྲྀ͠ɼ৴ೱ઒΁ͱ߹ͱͳΔਫਂ೾௕ൺɼॎ࣠ΛՏচޯ഑ͱͨ͠ 2 ࣠ͷؔ܎ྲྀ͢ΔҰ‫ڃ‬Տ઒Ͱ͋ΔɽಉՏ઒͸ 2019 ೥ʹൃੜͨ͠୆͔ΒՏচ೾Λ۠෼͢Δ΋ͷͰ͋Δɽ͜ͷ۠෼๏ͷಛ௃

෩ 19 ߸ʹΑΓɼ৴ೱ઒ͱͷ߹ྲྀ఺ΑΓ 26 km ෇ۙʹҐ͸ɼैདྷͷ҆ఆੑղੳʹΑΔ۠෼ਤͱ͸ҟͳΓɼྲྀମஔ͢ΔӚౡ‫ڮ‬Լྲྀʹ͓͍ͯɼେ‫ن‬໛ͷՏ‫ܽ؛‬ଛ͕ࠨӈྗֶతͳ‫͔఺؍‬ΒՏচ೾Λ۠෼͢Δͱͱ΋ʹɼ3 छͷՏ‫ Ͱ؛‬11 Օॴ΋ੜͨ͡ɽ͜ͷ۠ؒͷՏচޯ഑͸ 1/100 ఔচ೾Λ 1 ͭͷਫਂ೾௕ൺͰ۠෼͢Δ఺ʹ͋Δɽԣ࣠ͷ౓Ͱ͋Γɼൺֱత‫ޯٸ‬഑ͱͳ͍ͬͯΔɽ·ͨɼಉ۠ؒʹਫਂ೾௕ൺͱॎ࣠ͷՏচޯ഑͔Βߏ੒͞ΕΔฏ໘্ʹ͓͚ΔՏচཻ‫ܘ‬͸ 40 mm ఔ౓ͱͳ͍ͬͯΔɽ

͓͍ͯɼ3 ͭʹେผ͞ΕΔՏচ೾͕ൃੜɼଘࡏ͢ΔྖҬb)Λ͍ࣔͯ͠Δɽಉ۠෼๏ʹΑΓɼՏಓ͕ੜདྷతʹ༗͢Δੑ࣭ͷ೺Ѳ͕‫ظ‬଴Ͱ͖Δɽର৅۠ؒ
ର৅۠ؒ͸Տ‫ܽ؛‬ଛՕॴΛ‫ؚ‬Έఆ‫ظ‬ԣஅଌྔσʔλ͕

ଘࡏ͢Δ৴ೱ઒߹ྲྀ఺͔Β 10.6 km ͔Β 30 km ͱͨ͠ɽɹຊ‫Ͱڀݚ‬͸ɼਫਂ೾௕ൺʹΑΓՏಓͷେ‫ہ‬తͳੑ࣭Λ೺Ѳ͠ɼՏಓม‫ܗ‬ͷ‫ݥة‬ੑͷߴ͍ՕॴͷൣғΛߜΔ(2)ೳੜ઒͜ͱ͕Մೳ͔‫ূݕ‬Λߦ͏ɽa)ඃࡂ֓ཁೳੜ઒͸৽ׁ‫ڕࢳݝ‬઒ࢢΛྲྀΕΔ৽ׁ‫͕ݝ‬؅ཧ͢Δ(2)ΤωϧΪʔूੵ๏Տ‫ܽ؛‬ଛ΍৵৯ഁఅ͸ग़ਫ࣌ʹ͓͚ΔՏಓ಺ͷՏচՏ઒Ͱ͋ΔɽಉՏ઒͸ฏ੒ 29 ೥ 7 ݄߽Ӎ͓Αͼಉ೥ 10݄୆෩ʹΑΔग़ਫͰɼΘ͔ͣ 10 km ʹ΋ຬͨͳ͍۠ؒมಈ΍‫΁؛ޢ‬ͷྲྀମྗ͕ओͨΔཁҼͱਪଌ͞Ε͍ͯΔɽ

ʹ͓͍ͯ 8 Օॴ΋అ๷͕৵৯౳ʹΑΓඃࡂͨ͠ɽಛʹஶऀΒͷҰਓ2) ͸ɼ‫͢༻࡞ʹ؛ޢ‬Δྲྀମྗʹண໨͠ɼฏ

ฏ੒ 29 ೥ 7 ݄߽ӍʹΑΔग़ਫ͕େ͖ͳඃ֐Λ΋ͨΒ͠ɼඃࡂԆ௕͕௕͔ͬͨՕॴͰ͸઒෯ 80 m ΄Ͳʹରͯ͠ք৚݅ʹ͸ฏ੒ 29 ೥߽Ӎͷग़ਫ࣌ʹ͓͚ΔྲྀྔͰ͋Δ

110 m ΋అମͷ৵৯ʹࢸͬͨɽఅମͷ৵৯ͷൃੜ࣌ͷ

250 m3 /s Λ༩͑ɼԼྲྀ୺‫ڥ‬ք৚݅ʹ͸ͦͷ࣌ͷ౳ྲྀਫਫҐ͸ɼఅ๷ͷఱ୺ߴΑΓ΋௿͘ɼӽਫ͢Δ΄ͲͷਫҐਂΛ༩͑ͨɽͰͳ͔ͬͨ͜ͱ͕ਪ࡯͞Ε͍ͯΔɽ͜ͷ۠ؒͷՏচޯb)ਪఆ݁Ռ഑͸ 1/80 ఔ౓Ͱ͋Γɼ‫ڕ‬໺઒ͱಉ༷ʹൺֱత‫ޯٸ‬഑ͱ

ਤ–1 ͷ a) ʹਫਂ೾௕ൺͷ۠෼ਤΛࣔ͢ɽಉਤ͸Տচͳ͍ͬͯΔɽ·ͨɼಉ۠ؒʹ͓͚ΔՏচཻ‫ܘ‬͸ 80 mmޯ഑ͱਫਂ೾௕ൺΛ 2 ࣠ͱ͢ΔάϥϑͰ͋Γɼ‫ط‬ԟͷఔ౓Ͱ͋Δɽ‫݁ڀݚ‬ՌΛ੔ཧ͠άϥϑ಺ʹϓϩοτ͍ͯ͠Δɽ·ͨɼb)ϓϩοτ͞Ε͍ͯΔϚʔΫͷ‫ܗ‬͸ɼͦͷՏಓʹൃୡ͢ର৅۠ؒର৅۠ؒ͸ɼඃࡂԆ௕͕࠷΋௕͍ՕॴΛ‫ؚ‬ΉՏ‫͔ޱ‬

Β 1.5 km ͔Β 5.0 km ͱͨ͠ɽΔՏচ‫ܗ‬ঢ়Λද͍ͯ͠Δɽ
ɹ 2 ষͰड़΂ͨͱ͓Γɼಉਤͷॎ࣠͸Տচޯ഑ɼԣ࣠͸ਫਂ೾௕ൺͰ͋Δɽփ৭ͰృΓͭͿ͞Εͨൣғ͸Տ

4.

‫ܽ؛‬ଛ΍৵৯ഁఅͷཁҼͱͳΔ࠭भ͕ൃੜ͢ΔྖҬͰ֤छ๏ͷਪఆ݁Ռ͋Δɽ·ͨɼ͜ͷྖҬ͸Տಓม‫ʹܗ‬ཁ͢Δे෼ͳΤω

2 ষͰड़΂ͨ 2 छͷਪఆ๏Λ༻͍ͯҎԼͷखॱʹΑΓ‫ݥة‬ՕॴΛෳ૚తʹਪఆ͢ΔɽϧΪʔΛ༗͢Δ͜ͱ͕ਪଌ͞Εɼ৵৯ഁఅ΍Տ‫ܽ؛‬ଛ͕ൃੜ͢Δ‫ݥة‬ੑͷߴ͍ྖҬͰ͋Δͱਪ࡯͞ΕΔɽ

1. Ұൠஅ໘ͷҰ࣍‫ݩ‬ਫཧ‫ʹࢉܭ‬ΑΓର৅Տ઒ͷશҬɹਤ–1 ͷ b) ͱ c) ʹ‫ڕ‬໺઒ͱೳੜ઒ʹ͓͚Δਫਂ೾௕ʹ͓͍ͯਫਂ೾௕ൺΛࢉग़͠ɼՏಓม‫ܗ‬ͷཁҼͱൺͷ۠෼ਤͷ݁ՌΛࣔ͢ɽ྆Տ઒ͱ΋ʹҰൠஅ໘ͷҰͳΔՏচ೾ͷൃੜͱΤωϧΪʔͷߴ͍۠ؒΛਪఆ࣍‫࣌ࢉܭݩ‬ͷஅ໘ִؒ͝ͱʹޯ഑ͱਫਂ೾௕ൺΛͦΕ͢ΔɽͧΕࢉग़͠ɼͦΕΒΛϓϩοτ͍ͯ͠Δɽ·ͨɼಉਤ

2. ্‫ه‬ͷํ๏ʹΑΓ‫ݥة‬ੑ͕ߴ͍ͱਪఆ͞Εͨ۠ؒ͸্ྲྀͷ఺΄Ͳ੨৭͕ೱ͘ɼԼྲྀͷ఺΄Ͳ੨৭͕ബ͘Λର৅ͱͯ͠ɼฏ໘ೋ࣍‫ݩ‬ͷਫཧղੳΛ࣮ࢪ͠ɼΤͳΓന৭ʹۙͮ͘Α͏ʹண৭͍ͯ͠ΔɽωϧΪʔूੵ๏ʹΑΓ‫ॴہ‬తͳՏಓ಺ͷ‫ݥة‬Օॴɹ·ͣɼ‫ڕ‬໺઒ͷ݁ՌΛ‫ݟ‬Δͱɼର৅۠ؒͷਫਂ೾௕ൺͷਪఆΛߦ͏ɽ

͸ 10−3 ͔Β 10−2 ಺ʹ෼෍͢Δ༷ࢠ͕‫ݟ‬ΒΕΔɽॎ࣠ͷՏচޯ഑Λ‫ݟ‬Δͱɼബ͍੨৭ͷԼྲྀ۠ؒ͸ൺֱతՏ(1)ਫਂ೾௕ൺͱՏচޯ഑ʹΑΔՏಓಛੑͷ۠෼চޯ഑͕؇΍͔Ͱɼೱ͍੨৭ͷ্ྲྀ۠ؒʹߦ͘΄ͲՏa)‫ࢉܭ‬৚݅চޯ഑͕‫ͳʹٸ‬Δ܏޲͕‫ݟ‬ΒΕΔɽ͜ͷ݁ՌΑΓɼରਫਂ೾௕ൺ͸ର৅Տ઒ͷਫਂΛ࠭भͷ೾௕Ͱআ͢Δ৅۠ؒશମΛ௨ͯ࠭͠भεέʔϧʹҐஔ͢Δ͜ͱ͕Θ͜ͱͰ‫ٻ‬ΊΔɽ࠭भͷ೾௕͸ GoogleMap ͷߤۭࣸਅΑ͔ΔɽՃ͑ͯɼඃࡂՕॴ͕Ґஔ͢Δ্ྲྀͷ۠ؒ͸ΑΓΓଯੵ෦ͷ௕͞Λௐࠪ͠ɼͦͷ௕͞Λ 2 ഒͯ࠭͠भͷՏಓม‫ܗ‬Λ༰қʹੜ͡ΔΤωϧΪʔΛ༗͍ͯ͠Δ͜ͱ1 ೾௕෼ͷ௕͞ͱͨ͠ɽͳ͓ɼ࠭भͷ೾௕ͷௐࠪʹ༻͍͕ਪଌ͞ΕΔɽͨߤۭࣸਅ͸ର৅ߑਫͷൃੜ࣌‫ͱ͍ۙ͜ͱظ‬Λ֬ೝ͠ɹ࣍ʹɼೳੜ઒ͷ݁ՌΛ‫ݟ‬Δͱɼର৅۠ؒͷਫਂ೾௕͍ͯΔɽ࣍ʹɼਫਂ͸Ұൠஅ໘ͷҰ࣍‫ݩ‬ਫཧ‫ࢉܭ‬ΛҎൺ͸શମΛ௨ͯ͠ 10−3 ͔Β 10−2 ಺Φʔμʔʹ෼෍͢Լͷ৚݅ͰͦΕͧΕߦͳͬͨɽΔ༷ࢠ͕‫ݟ‬ΒΕΔɽՏচޯ഑Λ‫ݟ‬Δͱɼશ۠ؒΛ௨͠ɹ‫ڕ‬໺઒Λର৅ͱͨ͠‫Ͱࢉܭ‬͸ɼฏ੒ 24 ೥౓ʹଌྔ͞

ͯ 10−2 ෇ۙʹ෼෍͠ɼ্Լྲྀ۠ؒͰҟͳΔΑ͏ͳ܏޲Εͨఆ‫ظ‬ԣஅଌྔσʔλΛ༻͍ͨɽ‫ࢉܭ‬ͷִۭؒؒ͸ɼ͸ͳ͔ͬͨɽ͜ͷ݁ՌΑΓɼೳੜ઒͸ର৅۠ؒશମΛఆ‫ظ‬ԣஅଌྔͷ࣮ࢪִؒͱಉ͡ 200 m ִؒͱ͠ɼର৅௨ͯ࠭͠भ͕ൃੜ͠Տಓม‫ܗ‬ͷͨΊͷΤωϧΪʔΛ༗۠ؒͷૈ౓܎਺͸ɼࠃަল͕ެද͍ͯ͠ΔՏচࡐྉ 50͍ͯ͠ΔՏಓͰ͋Δ͜ͱ͕ਪଌ͞ΕΔɽ

mm ΛࢀߟʹϚχϯάετϦΫϥʔ͔ࣜΒࢉग़ͨ͠ɽ·ͨɼ্ྲྀ୺‫ڥ‬ք৚݅ʹ͸୆෩ 19 ߸ͷग़ਫ࣌ʹର৅۠ؒ(2)ͷ‫ॴہ‬తͳਪఆͷͪΐ͏ͲதؒʹҐஔ͢Δ࿡೔ொ‫؍‬ଌॴͰ‫؍‬ଌ͞Εͨ3ྲྀྔͱ΄΅ಉఔ౓ͷྲྀྔͰ͋Δྲྀྔ 1200 m /s Λ༩͑ɼԼྲྀ୺‫ڥ‬ք৚݅ʹ͸ͦͷ࣌ͷ౳ྲྀਫਂΛ༩͑ͨɽΤωϧΪʔूੵ๏ʹΑΔՏ‫ܽ؛‬ଛɾ৵৯ഁఅՕॴa)‫ࢉܭ‬৚݅ΤωϧΪʔूੵ๏ͷద༻ͷͨΊʹ࣮ࢪͨ͠ਫཧղੳɹೳੜ઒Λର৅ͱͨ͠‫Ͱࢉܭ‬͸ɼఆ‫ظ‬ԣஅଌྔʹΑΔʹ͸ɼฏ໘ೋ࣍‫ݩ‬ਫཧղੳͷιϧόʔͰ͋Δ iRIC9) ʹԣஅ໘‫ܗ‬ঢ়ͷඪߴσʔλ͕ଘࡏ͠ͳ͍ͨΊɼDEM σʔಉࠝ͞ΕΔ Nays2DH Λ༻͍ͨɽλΛ༻͍ͯ‫͢༻࢖ʹࢉܭ‬Δஅ໘ͷ࡞੒Λߦͳͬͨɽ‫ܭ‬ɹ‫ڕ‬໺઒ͷ‫ࢠ֨ࢉܭ͍ͨ༻ʹࢉܭ‬͸ɼฏ੒ 28 ೥ʹଌྔࢉͷִۭؒؒ͸ɼ50 m ִؒͱ͠ɼର৅۠ؒͷૈ౓܎਺͞Εͨ DEM σʔλ (3.8 m ʹ 1 ఺ͷִؒ) Λ࢖༻͠ɼඪ

͸ɼࠃަল͕ެද͍ͯ͠ΔՏচࡐྉ 80 mm ΛࢀߟʹϚߴσʔλ͕ͳ͍‫ף‬ਫ෦͸ఆ‫ظ‬ԣஅଌྔͷඪߴσʔλͰχϯάετϦΫϥʔ͔ࣜΒࢉग़ͨ͠ɽ·ͨɼ্ྲྀ୺‫ڥ‬ิؒ͠࡞੒ͨ͠ɽର৅۠ؒ͸ਫਂ೾௕ൺʹΑΔਪఆͰa) 3 ͭͷՏচ೾ͷ۠෼ʢઌߦ‫ڀݚ‬6) ʣb) ‫ڕ‬໺઒ͷՏচ೾ͷ෼ྨc) ೳੜ઒ͷՏচ೾ͷ෼ྨ

ਤ−1–1 ਫਂ೾௕ൺͱՏচޯ഑ʹΑΔՏচ೾ͷ෼ྨ−2 ‫ڕ‬໺઒ͷຎࡲ଎౓ͷภࠩͱ࣮ࡍͷඃࡂՕॴͱͷൺֱ
ਤ–2−3 ೳੜ઒ͷຎࡲ଎౓ͷภࠩͱ࣮ࡍͷඃࡂՕॴͱͷൺֱਤ–3Տ‫ܽ؛‬ଛ΍৵৯ഁఅͷ‫ݥة‬ੑͷߴ͍ͱਪఆ͞Εͨޯ഑͕ 1/100 ͷ۠ؒʢѴ‫ڮ‬ΑΓ্ྲྀͷ۠ؒʣͱͨ͠ɽb)ਪఆ݁Ռ
ਤ–2 ʹ‫ڕ‬໺઒ʹ͓͚ΔΤωϧΪʔूੵ๏ʹΑΔਪఆɹ࣍ʹɼೳੜ઒ͷ‫ࢠ֨ࢉܭ͍ͨ༻ʹࢉܭ‬͸ɼฏ੒ 28 ೥݁Ռɼਤ–3 ʹೳੜ઒ͷΤωϧΪʔूੵ๏ʹΑΔਪఆ݁ʹଌྔ͞Εͨ DEM σʔλ (3.8 m ʹ 1 ఺ͷִؒ) Λ࢖ՌΛࣔ͢ɽਤ໘ʹࣔ͢ίϯλʔਤ͸‫ͨ͠༻࢖ʹ࣌ࢉܭ‬༻͠࡞੒ͨ͠ɽೳੜ઒͸‫ڕ‬໺઒ͱҟͳΓ‫ף‬ਫ෦ͷඪߴ࠶‫ݱ‬஍‫͋Ͱܗ‬Γɼͦͷ্ʹ࣮ࡍͷඃࡂՕॴΛԫ৭͍ϚʔσʔλΛิؒ͢ΔͨΊͷఆ‫ظ‬ԣஅଌྔσʔλ͕ະ੔උΫɼΤωϧΪʔूੵ๏ʹΑΔਪఆՕॴΛຎࡲ଎౓ͷภࠩͩͬͨͨΊɼग़ਫ࣌ͷྲྀྔ͔Β౳ྲྀਫਂΛ‫ٻ‬ΊɼDEM

͕ 1σ Ҏ্ɼ2σ Ҏ্ɼ3σ Ҏ্ͷ֤ʑΛ੨ɼ྘ɼ੺ͷγͷඪߴ஋͔Β 0.5 m Լ͛ͨ஋Λ༩͑ͨɽૈ౓܎਺΍‫ڥ‬ϯϘϧͰࣔͨ͠ɽ͜ͷγϯϘϧͷՕॴ͕Տ‫ܽ؛‬ଛɼ৵ք৚݅ʹ͍ͭͯ͸ɼ྆Տ઒ͱ΋ʹલઅͷҰ࣍‫ͱࢉܭݩ‬৯ഁఅͷ‫ݥة‬ੑ͕ߴ͍ͱਪఆ͞ΕͨՕॴͰ͋Δɽͳ͓ɼಉ༷ͷઃఆͱͨ͠ɽຎࡲ଎౓ͷภࠩͷࢉग़͸දࣔதͷશ۠ؒΛର৅ͱ͠ɼਤ

ਤ−4–4 σʔλͷղ૾౓ͷҧ͍ʹΑΔΤωϧΪʔूੵ๏ͷ݁Ռͷൺֱʢ্ਤɿఈ໘‫ܗ‬ঢ়ɼԼਤɿΤωϧΪʔूੵ๏ʣࣔͨ͠γϯϘϧ͸Տ‫ܽ؛‬ଛ΁ͷ‫د‬༩͕ਪଌ͞ΕΔࠨӈඃࡂՕॴͱΤωϧΪʔूੵ๏ͷਪఆՕॴ͕ॏͳΔ༷ࢠͷ‫؛‬Ԋ͍͔Βྲྀ৺ํ޲ʹ 3 ͭͷ‫఺ࢉܭ‬ͷΈͱͨ͠ɽ͕‫ݟ‬ΒΕͨೳੜ઒Λର৅ͱͨ͠ɽ‫͍༻ʹࢉܭ‬Δ‫֨ࢉܭ‬ɹ·ͣɼ‫ڕ‬໺઒ͷਪఆ݁Ռʹ͍ͭͯ‫ͯݟ‬ΈΔͱɼ࣮ࡍࢠ͸ඪߴσʔλΛ 30.9 m ʹ 1 ఺ɼ15.5 m ʹ 1 ఺ɼ7.7

ͷඃࡂՕॴͱɼຎࡲ଎౓ͷภ͕ࠩ 1σ Ҏ্ͷՕॴͱҰகm ʹ 1 ఺ɼ3.8 m ʹ 1 ఺ͱมԽͤ͞ɼͦΕͧΕΤωϧͨ͠Օॴ͸্ྲྀ୺ͷ 1 ՕॴͷΈͰɼͦΕҎ֎ͷՕॴ͸Ϊʔूੵ๏ʹΑΓ‫ݥة‬ՕॴͷਪఆΛߦͬͨɽҰக͕‫ݟ‬ΒΕͳ͔ͬͨɽb)ɹ࣍ʹɼೳੜ઒ͷਪఆ݁Ռʹ͍ͭͯ‫ͯݟ‬ΈΔͱɼ࣮ࡍͷඃࡂՕॴͱຎࡲ଎౓ͷภ͕ࠩ 1σ Ҏ্ͷՕॴ͕શͯͷՕॴͰҰக͢Δ༷ࢠ͕‫ݟ‬ΒΕͨɽ(3)஍‫ܗ‬σʔλͷղ૾౓ʹΑΔΤωϧΪʔूੵ๏ͷద༻ൣғલষͰࣔͨ͠‫ڕ‬໺઒ͱೳੜ઒ͷͦΕͧΕͷΤωϧΪʔूੵ๏ͷ݁ՌΛ‫ͯݟ‬ΈΔͱɼೳੜ઒ͷํ͕Տಓ಺ͷ஍‫ܗ‬ΛΑΓ஧࣮ʹ࠶‫͓͖ͯͰݱ‬ΓɼΤωϧΪʔूੵ๏ͷਪఆՕॴͱඃࡂՕॴ͕ΑΓҰக͍ͯ͠Δɽ͜ͷ͜ͱ͔Βɼ‫͍༻ʹࢠ֨ࢉܭ‬Δඪߴσʔλͷղ૾౓͕ΤωϧΪʔूੵ๏ͷ݁ՌʹӨ‫͍ͯ͠ڹ‬Δ͜ͱ͕ࣔࠦ͞ΕΔɽͦ͜ͰɼΤωϧΪʔूੵ๏ʹ༻͍Δඪߴσʔλͷղ૾౓ΛมԽͤ͞ɼਪఆʹे෼ͳσʔλͷղ૾౓Λௐ΂Δɽa)‫ํূݕ‬๏ඪߴσʔλͷղ૾౓ΛมԽͤͨ͞ਪఆ݁Ռ
ਤ–4 ͷ্ਤʹඪߴσʔλͷղ૾౓Λม͑ͨ৔߹ͷ࠶‫ݱ‬஍‫ܗ‬ɼԼਤʹͦͷ‫ࢠ֨ࢉܭ‬Λ༻͍ͨΤωϧΪʔूੵ๏ͷ݁ՌΛࣔ͢ɽ࠷্ஈͷਤ͸ 30.9 m ʹ 1 ఺ͷඪߴσʔλΛ΋ͪɼԼʹߦ͘΄Ͳඪߴσʔλͷղ૾౓͸ߴ͘ͳΓɼ࠷Լஈͷਤ͸ 3.8 m ʹ 1 ఺ͷඪߴσʔλΛ࣋ͭղ૾౓͕࠷΋ߴ͍݁ՌΛ͍ࣔͯ͠Δɽɹ·ͣɼ࠷্ஈͷղ૾౓ͷ࠷΋௿͍ 30.9 m ʹ 1 ఺ͷ஍‫Ͱܗ‬͸ɼԜತ͸֬ೝͰ͖Δ΋ͷͷɼՏচ‫ܗ‬ঢ়͸ࣗવՏ઒Ͱ͸‫͞࡯؍‬Εͳ͍Α͏ͳෆࣗવͳ஍‫ͳͱܗ‬Δɽσʔλͷղ૾౓͕ߴ͍Լஈଆͷਤ΄ͲɼՏಓ಺ͷᖕ‫໌͕ے‬ྎͱͳΓɼղ૾౓ͷ࠷΋ߴ͍ 3.8 m ʹ 1 ఺ͷ஍‫Ͱܗ‬͸Տಓશମʹ͓͍ͯަ‫࠭ޓ‬भΛ֬ೝͰ͖Δɽɹ࣍ʹɼԼਤͷΤωϧΪʔूੵ๏ͷਪఆ݁Ռʹ͍ͭͯͰ͋Δɽ·ͣɼඪߴσʔλͷղ૾౓͕௿͍ 30.9 m ͷ݁ՌΛ‫ݟ‬ΔͱɼΤωϧΪʔूੵ๏ʹΑΓਪఆ͞Εͨ৵৯ಉҰՏ઒ʹ͓͍ͯ‫ࢠ֨ࢉܭ‬ͷඪߴσʔλͷղ૾౓ΛഁఅՕॴ͕఺ࡏ͍ͯ͠Δ͕ɼਪఆՕॴͱॏͳ͍ͬͯΔඃมԽͤͯ͞‫ࢉܭ‬Λߦ͍ɼσʔλͷղ૾౓͕ΤωϧΪʔࡂՕॴ͸ 3 Օॴ͋Δ͏ͪதؒͷ 1 ՕॴͷΈͰ͋Δɽਤूੵ๏ͷ݁Ռʹ༩͑ΔӨ‫͢ূݕ͍ͯͭʹڹ‬ΔɽલઅͰͷԼʹߦ͘ʹͭΕͯඪߴσʔλͷղ૾౓Λ 15.5 m ʹ 1

ද−1–1 ֤Տ઒ͷਪఆʹ༻͍ͨσʔλͷछྨ

ද−2–2 ֤Տ઒ͷ֤ख๏ʹΑΔਪఆ݁Ռର৅Տ઒ਫਂ೾௕ൺΤωϧΪʔूੵ๏ର৅Տ઒ਫਂ೾௕ൺΤωϧΪʔूੵ๏‫ڕ‬໺઒ఆ‫ظ‬ԣஅଌྔ

DEM ʴఆ‫ظ‬ԣஅଌྔ‫ڕ‬໺઒ඃࡂ۠ؒͱҰகഁఅՕॴͱҰகͤͣೳੜ઒

DEMDEMೳੜ઒ඃࡂ۠ؒͱҰகഁఅՕॴͱҰக

఺ɼ7.7 m ʹ 1 ఺ͱσʔλͷղ૾౓͕ߴ͘ͳΔͱɼΤωΔɽຊਪఆ๏ΛҟͳΔ 2 ͭͷՏ઒ʹద༻ͨ͠ͱ͜ΖɼҰϧΪʔूੵ๏ʹΑΔਪఆՕॴ͕૿Ճ͍͖ͯ͠ɼղ૾౓࣍‫͔ࢉܭݩ‬ΒಘΒΕΔਫਂ೾௕ൺʹΑΔ۠෼Ͱ͸ɼՏ

͕ 30.9 m ͷͱ͖ʹ͸ਪఆ͞Εͳ͔ͬͨ࠷্ྲྀͷഁఅՕಓ಺ͷৄࡉͳඪߴσʔλ͕ະ੔උͰ͋ͬͯ΋ɼՏಓͷॴ͕ΤωϧΪʔूੵ๏ʹΑΔਪఆՕॴͱॏͳΔ༷ࢠ͕େ‫ہ‬తͳՏಓม‫ܗ‬ͷՄೳੑͷߴ͍۠ؒΛਪఆͰ͖Δ͜‫ݟ‬ΒΕͨɽղ૾౓ͷ࠷΋ߴ͍ 3.8 m ʹ 1 ఺ͷ݁ՌͰ͸ͱ͕ࣔࠦ͞ΕͨɽҰํͰɼೋ࣍‫ࢉܭݩ‬Λ࢖༻͢ΔΤω࠷ԼྲྀͷඃࡂՕॴͷपลʹ΋ਪఆՕॴ͕఺ࡏ͢Δ༷ࢠϧΪʔूੵ๏Ͱ͸ɼ࠭भʹ༝དྷͨ͠ᖕ‫ے‬෦Λे෼ʹղ͕‫ݟ‬ΒΕͨɽ૾Ͱ͖Δඪߴσʔλ͕ଘࡏ͢Δ࣌ʹՏ‫ܽ؛‬ଛ΍৵৯ഁఅͷ‫ݥة‬ՕॴΛྑ޷ʹਪఆͰ͖Δ͜ͱΛࣔͨ͠ɽ

2 Տ઒ʹ͓͚Δ 2 ͭͷਪఆख๏ʹΑΔਪఆ݁Ռͷൺֱɹຊ‫ڀݚ‬Λ௨͠ɼඪߴσʔλͷۭؒղ૾౓͕ߴ͍΄Ͳ

ද–1 ʹ֤Տ઒ͷ‫ͨ͠༻࢖ʹࢉܭ‬σʔλɼද–2 ʹ֤छͷ߹ཧతͳܾఆ๏͸ஶऀΒ͕஌Δ‫ݶ‬Γະཱ֬Ͱ͋Δɽ‫ݱ‬5.

‫ݥة‬Օॴͷ‫ݟ‬ಀ͕͠‫ݮ‬Δ͜ͱ͕ࣔࠦ͞Εͨɽ͔͠͠ɼ্ड़·Ͱͷਪఆ๏ͰඞཁͱͳΔඪߴσʔλͷۭؒղ૾౓๏ʹΑΔਪఆ݁Ռͷ·ͱΊΛࣔͨ͠ɽ࣌఺ͰஶऀΒ͸ɼαϯϓϦϯάఆཧʹ‫Ͱͱͮ͘͜ج‬ఆɹ·ͣɼਫਂ೾௕ൺͷ݁Ռ͸ɼ֤Տ઒Ͱग़ਫ࣌ͷՏಓྔతʹܾఆͰ͖Δͱߟ͍͑ͯΔɽͨͩ͠ɼ‫׬‬શʹ‫ػ‬ցม‫ܗ‬ͷ༷ࢠͱਫਂ೾௕ൺͷ۠෼ਤΑΓਪఆ͞ΕͨՏಓతʹ‫ݥة‬ՕॴΛਪఆ͢ΔͨΊͷ՝୊ͱͯ͠ɼ‫؛ޢ‬ͷߏม‫ܗ‬ͷ‫ݥة‬ੑͷߴ͍͕֤۠ؒՏ઒ͰҰக͢Δ͜ͱΛ֬଄ͷ৽‫ʹچ‬ΑΔ଱‫ٱ‬ੑͷҧ͍΍ɼͦ΋ͦ΋ඃࡂՕॴͱೝͨ͠ɽਫਂ೾௕ൺʹΑΔਪఆͰ࣮ࢪͨ͠Ұ࣍‫ࢉܭݩ‬͸ͳΒͳ͍ࢁ෇͖ͷ۠ؒͷѻ͍ͳͲ͕‫͛ڍ‬ΒΕΔɽ͸ɼ‫ڕ‬໺઒Ͱ͸ఆ‫ظ‬ԣஅଌྔͷσʔλΛ࢖༻͠ɼೳੜ
઒Ͱ͸ DEM σʔλΑΓ࡞੒ͨ͠Ұൠஅ໘Λ࢖༻ͯ͠‫ࢉܭ‬Λߦͬͨɽ‫ڕ‬໺઒ͷσʔλͷִؒ͸ 200 mɼೳੜ઒ͷσʔλͷִؒ͸ 50 m ͱͦΕͧΕσʔλͷղ૾౓͸େ͖͘ҟͳΔɽ͔͠͠ɼ྆Տ઒ͱ΋ਪఆ͞ΕͨՏಓಛੑͱ࣮ࡍͷՏಓม‫͕ܗ‬ಉ༷ͷ܏޲͕ಘΒΕɼਫਂ೾௕ൺͷਪఆʹରͯ͠ɼ্‫ه‬ͷۭؒ෼ղೳͷࠩҟ͸େ͖ͳӨ‫ڹ‬͸‫͍ͳ͞΅ٴ‬΋ͷͱਪଌ͞ΕΔɽɹ࣍ʹɼΤωϧΪʔूੵ๏Ͱ͋Δ͕ɼ‫ڕ‬໺઒ͷ݁ՌͰ͸Տ‫ܽ؛‬ଛ·ͨ͸৵৯ʹΑΔഁఅՕॴͱਪఆ͞Εͨ‫ة‬‫ݥ‬Օॴ͕Ұக͢ΔՕॴ͸ 4 Օॴத 1 Օॴ͚ͩͰ͋ͬͨɽҰํͰɼೳੜ઒Ͱ͸ਪఆ͞Εͨ‫ݥة‬Օॴ͕࣮ࡍͷഁఅՕॴͱҰகͨ͠ɽ4 ষͷ 3 અͰ͸‫ݥة‬ՕॴͱΤωϧΪʔूੵ๏ʹΑΔਪఆՕॴ͕ॏͳΔ༷ࢠ͕‫ݟ‬ΒΕͨೳੜ઒Λର৅ͱͯ͠ඪߴσʔλͷղ૾౓ΛมԽͤͨ͞ਪఆ݁ՌͷมԽΛࣔͨ͠ɽͦͷ݁Ռɼ‫ࢠ֨ࢉܭ‬ͷඪߴσʔλͷۭؒղ૾౓Λ૿େͤ͞Δ͜ͱ͸ɼਪఆਫ਼౓ͷ޲্ʹ͋Δఔ౓‫د‬༩͢Δ͜ͱ͕ࣔࠦ͞Εͨɽ6.

͓ΘΓʹຊ‫Ͱڀݚ‬͸ɼ࠭भՏ઒ʹ͓͚ΔՏ‫؛‬৵৯΍৵৯ഁఅͷ‫ݥة‬ੑΛਪఆ͢Δෳ૚తͳख๏ʹ͍ͭͯ࿦ͨ͡ɽຊࢀߟจ‫ݙ‬1) T. Nagata, Y. Watanabe, H. Yasuda, A. Ito, Development of a meandering channel caused by the planformshape of the river bank, EARTH SURFACE DYNAMICS 2(1) 255 - 270 2014.
2) ҆ాߒอ, ߴ‫ݰڮ‬, ञҪެ෉, ஛ଜਔࢤ, ‫ेޒ‬ཛྷ઒ʹ͓͚ΔՏ઒ߏ଄෺΁ͷྲྀ଎ͷ࡞༻࣌ؒʹண໨ͨ͠ඃࡂཁҼͷ෼ੳ, Տ઒ٕज़࿦จू, ୈ 18 რ, pp.245-250, 2012.
3) ॏࢬະྰ, ळࢁҰ࿠, ฏদ༟थ, দຊ୓ຏ, ฏ੒ 24 ೥߽Ӎࡂ֐࣌ͷ඙ࢁ઒ͷ‫؛ޢ‬ɾՏ‫؛‬ඃࡂϓϩηεͷ‫ݕ‬౼, ౔໦ֶձ࿦จू B1(ਫ޻ֶ), Vol.71, pp.1399-1404, 2015.
4) ҆ాߒอ, ‫ेޒ‬ཛྷ୓࣮, ҆ాߊত, த౔ߛ࡞, தখՏ઒ʹ͓͚ΔՏಓ಺੬ऑ఺ͷਫཧֶతਪఆͷࢼߦ, Տ઒ٕज़࿦จू,ୈ 22 რ, pp.327-322, 2016.
5) ‫ेޒ‬ཛྷ୓࣮, ੴ‫ݪ‬ಓल, ҆ాߒอ, ຊଜ߁ߴ, ஛ੴҰ‫ت‬, Տಓͷอक఺‫ݕ‬ͷͨΊͷՏಓ੬ऑ۠ؒͷਫཧతਪఆ๏ͷఏҊ, Տ઒ٕज़࿦จू, ୈ 25 რ, pp. 617–622, 2019.
6) খؔത࢘, ҆ాߒอ, ਫਂ೾௕ൺΛ༻͍ͨՏচ೾ͷ౷Ұత۠෼ͱͦͷࢧ഑ਫཧྔ, ౔໦ֶձ࿦จू A2 ෼࡭ʢԠ༻ྗ
ֶʣ, ୈ 76 ‫ ר‬2 ߸, pp.I 489 - I 498, 2021.
7) Callander, R. A.:Instability and river channels, J. FluidMech., 36: 465–480, 1969ɽ8) ࠇ໦‫װ‬உɼ‫ྗ؛‬ɿத‫ن‬໛Տচ‫ܗ‬ଶͷྖҬ۠෼ʹؔ͢Δཧ࿦త‫ڀݚ‬ɼ౔໦ֶձ࿦จใࠂूɼNo. 342ɼpp.87–96ɼ1984ɽ9) ๺ւಓՏ઒ࡒஂɼhttp://i-ric.org.

ਪఆ๏͸ɼ࠭भՏ઒ͷߑਫ࣌ͷ‫ڍ‬ಈͳͲΛҟͳΔࢧ഑
ม਺Ͱઆ໌͢Δ 2 ͭͷਪఆ๏Λ૊Έ߹Θͤͨ΋ͷͰ͋

(2021.
4.4．
22受付)
ड෇)(2021．