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୰ᑠἙᕝࡢᅵ◁ሁ✚㍍ῶࡓࡅຠ⋡ⓗ ⥔ᣢ⟶⌮ᡭἲ㛵ࡍᥦ PROPOSAL ON THE EFFICIENT MITIGATION MEASURES FOR SEDIMENT DEPOSITION IN SMALL-MEDIUM RIVERS 㛗⏣࿃ 1 ᚨỌ㞞ᙪ 2 Ọ⏣㈼ᚿ 2 ᢨ⏣ Ẏ 2 ᗉ㔝 ᬛ 3 ᇛ㇏ 4 Kengo OSADA, Masahiko TOKUNAGA, Satoshi NAGATA, Tsuyoshi HIDA, Satoshi SHONO and Toyokatsu YUUKI 1 ṇဨ ༤ኈ㸦ᕤᏛ㸧ᅜ❧㧗ᑓᶵᵓ㜿༡㧗ᑓᩍᤵ 㐀ᢏ⾡ᕤᏛ⛉ 㸦774-0017 ᚨᓥ┴㜿༡ᕷぢ⬟ᯘ⏫㟷ᮌ265㸧 2 㠀ဨ ᚨᓥ┴┴ᅵഛ㒊 Ἑᕝ⯆ㄢ㸦770-8570 ᚨᓥ┴ᚨᓥᕷ௦⏫1┠1␒ᆅ㸧 3 㠀ဨ ᚨᓥ┴༡㒊⥲┴Ẹᒁ ┴ᅵഛ㒊㸦774-0030 ᚨᓥ┴㜿༡ᕷᐩᒸ⏫࠶⋤㇂46㸧 4 ṇဨ ༤ኈ㸦ᕤᏛ㸧ᅜ❧㧗ᑓᶵᵓ㜿༡㧗ᑓკクᩍᤵ 㐀ᢏ⾡ᕤᏛ⛉㸦㸧 It is necessary to develop a method for efficient management to reduce the sediment deposition in the small-medium rivers. In this study, the maintenance method is proposed for the improvement of sediment transport by moving the deposited materials to the right place in the channel. At first, we show the method for finding the process of sediment deposition and characteristics of river channel by using both the two-dimensional riverbed variation analysis and Fukuoka’s formula. And, the method is proposed to design proper longitudinal and cross-sectional form to correct the sediment transport problem. Key Words : Small-medium river, sediment deposition, 2-D riverbed variation analysis, Fukuoka’s equation, cross-sectional form 㸯㸬 ࡌࡣ ᚨᓥ┴ࡍ⌮⟶ࡀ୰ᑠἙᕝ᱓㔝ᕝࡢ11k㹼12.2k༊㛫 ࡣ㸪ᛶⓗ࡞ᅵ◁ሁ✚⏕⦾ⱱὶୗ⬟ຊࡢపୗ ࡀㄢ㢟ࡗ࡞࠾㸪H25ᖺᗘᙜ༊㛫ࡢ⏕㝖ཤἙ 㐨᥀๐ṇᐇࡓࡋ㸬ࡋࡋ㸪ࡢࡇ༊㛫ࡣH13㹼 H16ᖺᗘἙ㐨᥀๐ᐇࡀࡓࡋ㸪ᖺඖࡢ≧ἣ ᡠ⤒ࡓࡗ⦋࠶ࡀ㸪ᅇᨺ⨨ࡍࡤ㸪ࡄࡍᑐ⟇๓ ࡢ≧ែᡠࡇࡀᠱᛕࡉ㸬⏕ࡢᢤ᰿ฎศሁ✚ ᅵ◁ࡢ㐠ᦙ┦ࡣᛂࡀ⏝㈝ࡢࡓ㸪ࡌᑐ⟇ఱ ᗘᐇࡍࡇࡣຠ⋡ⓗ࠸࡞ࡣ㸬 ࡢࡇ༊㛫ࡢᅵ◁⛣≧ἣṇᚋⓎ⏕ࡓࡋH26ᖺ8 ᭶ὥỈ㸦᪤ ὥỈ㸧ᚋㄪᰝ⤖ࡓࡋᯝ㸪11kὶ ࡍᇽ㇂ᕝ㸦໙㓄1/100㸧ὶฟࡍࡀ♟࡞ࡁ᱓㔝 ᕝ㸦໙㓄1/600㸧ࡢὶ㒊ሁ✚ࡍࡇࡀ ࡓࡗ࡞㸬㐣ཤࡢ⯟✵┿ぢὶ㒊㏆ᙧᡂࡉ ◁ࡓᕞ㑊ࡅ࠺⃢➽ࡀᒅ᭤ࡍ≧ἣ☜ㄆࡉ㸪 ࡢࡇࡢ♟࡞ࡁሁ✚≀ࡀࢡ࡞ὶ㒊ὶഃ ⤒ࡢᖺⓗ࡞ሁ✚ࡌ⏕ࡀ࠸⪃ࡓ࠼㸬ࡢ♟࡞ࡁሁ✚㔞ࡣ㸪 1ᖺศ࠶ࡤᑡ㔞ࡓࡢ㸪ⴭ⪅ࡣ㸪ࡢࡇሁ✚ศἙ 㐨ෆ⛣ࡍࡇࢡ㒊ゎᾘࡋ㸪⛣ࡓࡏࡉᅵ ◁ᚎࠎ㐺ษ࡞Ἑ㐨⦪ᶓᙧ≧ᙧᡂࡏࡉࡇ㸪 ᙜヱ༊㛫ࡢᅵ◁ሁ✚㍍ῶࡏࡉ᪉⟇⥔ᣢ⟶⌮ ࡢ࠸⾜࠸ࡍᕝࡃࡀฟ᮶࠸࡞⪃ࡓ࠼㸬㐺ษ࡞Ἑ㐨 ⦪ᶓ㠃ᙧ≧ࡢタᐃἲࡋ㸪⚟ᒸ 1) ᅗ♧ ࡍᖹ㠃ḟඖὥỈὶἙᗋኚゎᯒ⚟ᒸࡢᘧ 2) ⏝ ࡋࡓ᪉ἲࡀᥦࡉ㸪పỈ㊰ࡢἙᗋὙ᥀ࡀㄢ㢟ࡗ࡞ ࠸ᮐෆᕝࡢ㐺⏝ࡢࡑຠᯝࡉ♧ࡀࡓ㸬 ᮏ◊✲ࡣ㸪ࡢࡇ᪉ἲἙᖜࡀ⊃࠸୰ᑠἙᕝ᱓㔝ᕝ 㐺⏝ࡋ㸪㝈ࡓἙᖜࡢ୰ࡢ࡞࠺Ἑ㐨⦪ᶓ㠃 ᙧ≧タᐃࡍࡤᅵ◁ሁ✚㍍ῶࡁἙ㐨⟶⌮ᮃ ࠸ࡋἙ㐨࡞ウࡍ㸬ࡎ㸪H26ᖺ8᭶ὥỈᑐ ㇟ࡋᖹ㠃ḟඖゎᯒ⚟ᒸࡢᘧ⏝࠸㸪ᅵ◁ሁ✚㐣 ࡢ⛬ศᯒἙ㐨≉ᛶࡢウᐇࡍ㸬ḟẖᖺሁ✚ ࡋࡓᅵ◁Ἑ㐨ෆࡢ㐺ษ⟠࡞ᡤ⛣ࡏࡉࡇᐃࡋ㸪 ┠ࡢࡑᶆ࡞ᮃ࠸ࡋἙ㐨㠃ᙧ≧♧ࡍ㸬タᐃ ࡋࡓἙ㐨⦪ᶓ㠃ᙧ≧ࡀᅵ◁ሁ✚㍍ῶᑐࡋຠᯝᣢࡕ㸪 ຠ⋡ⓗ⥔ᣢ⟶⌮⾜࠼Ἑ㐨࠶࠸ࡘ㸪ᖹ㠃 ḟඖゎᯒᏳᐃᛶウࡍ㸪⚟ᒸࡢᘧ ࡢẚ㍑⦪ⓗࡢ࡞࠺Ἑ㐨㠃ᙧ≧ࡀᮃ ࠸ࡋ≧ἣゝ࠼㸪ࡢࡑ⪃࠼᪉ᥦ♧ࡍ㸬 1 Ἑᕝᢏ⾡ㄽ㞟, ' 21s , 2015 6 - 229 -
Transcript
Page 1: p ` ]b u%Á ' 3M ö ¥ES á$× )T â'ö#. m 2 6õM M f Llibrary.jsce.or.jp/jsce/open/00906/2015/21-0229.pdf@ PG Z G'à d 0 20 40 60 80 100 1 10 100 1000 15.0k 12.0k 9.1k S5 ] ý1Â

PROPOSAL ON THE EFFICIENT MITIGATION MEASURES FOR SEDIMENT DEPOSITION IN SMALL-MEDIUM RIVERS

1 2 2 2 3 4 Kengo OSADA, Masahiko TOKUNAGA, Satoshi NAGATA, Tsuyoshi HIDA,

Satoshi SHONO and Toyokatsu YUUKI

1

774-0017 265 2 770-8570 1 1

3 774-0030 46 4

It is necessary to develop a method for efficient management to reduce the sediment deposition in the small-medium rivers. In this study, the maintenance method is proposed for the improvement of sediment transport by moving the deposited materials to the right place in the channel. At first, we show the method for finding the process of sediment deposition and characteristics of river channel by using both the two-dimensional riverbed variation analysis and Fukuoka’s formula. And, the method is proposed to design proper longitudinal and cross-sectional form to correct the sediment transport problem.

Key Words : Small-medium river, sediment deposition, 2-D riverbed variation analysis, Fukuoka’s equation, cross-sectional form

11k 12.2k

H25H13

H16

H26 8

11k1/100

1/600

1

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2)

H26 8

, 21 , 2015 6

- 229 -

Page 2: p ` ]b u%Á ' 3M ö ¥ES á$× )T â'ö#. m 2 6õM M f Llibrary.jsce.or.jp/jsce/open/00906/2015/21-0229.pdf@ PG Z G'à d 0 20 40 60 80 100 1 10 100 1000 15.0k 12.0k 9.1k S5 ] ý1Â

9.2k11.1k 11.6k

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10k

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13k

11k

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- 230 -

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2013 8

2(a)

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11.2k 12.0k

11.1k12.2k

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12.4k 11.6k11.6k

12.4k 11.6k 11.4k

11.4k 10.8k 11.4k 11.0k 10.8k

- 231 -

Page 4: p ` ]b u%Á ' 3M ö ¥ES á$× )T â'ö#. m 2 6õM M f Llibrary.jsce.or.jp/jsce/open/00906/2015/21-0229.pdf@ PG Z G'à d 0 20 40 60 80 100 1 10 100 1000 15.0k 12.0k 9.1k S5 ] ý1Â

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- 232 -

Page 5: p ` ]b u%Á ' 3M ö ¥ES á$× )T â'ö#. m 2 6õM M f Llibrary.jsce.or.jp/jsce/open/00906/2015/21-0229.pdf@ PG Z G'à d 0 20 40 60 80 100 1 10 100 1000 15.0k 12.0k 9.1k S5 ] ý1Â

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- 233 -

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1) (XXIV)

pp.123-164 2013. 2)

56 pp.I_1423-I_1428 2012.

3) Armoring195 pp.55-65 1971.

4) 206 pp.59-69 1972.

5) B1

Vol.69 No.4 pp.I_1165-I_1170 2013.

- 234 -


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