!) á S4 b ² p b v ~) slibrary.jsce.or.jp/jsce/open/00906/2014/20-0283.pdf · 2016. 2. 2. · Ì ]...

ሗ࿌ Ἑᕝᢏ⾡ㄽ㞟,➨20ᕳ,2014ᖺ6᭶ ᵽᕝࡅ࠾Ἑ㐨Ᏻᐃ℩ῡᵓ㐀 ࡢಖฟࡢ⤌ CONSERVATION MEASURES OF CHANNEL STABILIZATION AND POOL- RIFFLE STRUCTURE RESTORATION IN THE HII RIVER Ọᬛᖾ 1 ཎ⏣Ᏺၨ 2 ᯘ ༤ᚨ 3 㧗ᶫ㑥 4 Tomoyuki NAGAI, Morihiro HARADA, Hironori HAYASHI and Kuniharu TAKAHASHI 1 㠀ဨ ⚟ᒸ┴ ⚟ᒸ┴ᅵഛᡤ ⅏ᐖᴗᐊ㸦812-0053 ⚟ᒸᕷᮾ༊⟽ᓮ1┠18␒1 ⢑ᒇ⥲ᗇ⯋㸧 2 ṇဨ ༤㸦ᕤ㸧㸦⊂㸧ᅵᮌ◊✲ᡤ Ỉ⎔ቃ◊✲ࢢ ⮬↛ඹ⏕◊✲ࢭࢱ 㸦501-6021 ᒱ㜧┴ཎᕷᕝᓥ➟⏣⏫ᐁ᭷ᆅ↓␒ᆅ㸧 3 ṇဨ ༤㸦ᕤ㸧 ᕞᏛᏛ㝔ᕤᏛ◊✲㝔㸦819-0395 ⚟ᒸᕷす༊ඖᒸ744 ࢺࢫ2㤋1008ᐊ㸧 4 ṇဨ 㸦ᰴ㸧 ࢥࢫ㛵すᨭ♫ ⚄ᡞᨭᗑ㸦812-0016 ⚟ᒸᕷ༤ከ༊༤ከ㥐༡2-4-11㸧 This paper reports a series of actions to conserve channel stabilization and pool-riffle structure in the Hii River disaster restoration works. The Hii River is an urban river which flow through Fukuoka city. First, the outline of heavy rainfall disaster in July 2009 is presented. Secondly, some concerning matters in the improvement plan are discussed. The largest issue was lack of channel stability after changing cross-sectional channel form by riverbed excavation. One dimensional bed deformation analyses were conducted to discuss channel stability and necessity of countermeasure. In result, the river administrator employed two new types of river structure to conserve channel stability and pool-riffle structure in the Hii River. This case study presents a way to resolve the conflict between disaster prevention and ecosystem conservation in urban rivers. Key Words : pool-riffle structure, channel stabilization, movable bed simulation, rock riffle structure 㸯㸬ࡌࡣ ⣭Ἑᕝᵽᕝࡣ㸪ᖿᕝὶ㊰ᘏ㛗12.9km㸪ὶᇦ㠃✚ ࡣ29.1km 2 ࠸ࡢ୰ᑠἙᕝ㸪⚟ᒸᕷࡢᕷ⾤ᆅὶ ࡋ༤ከ‴ὀࡄ㒔ᕷἙᕝ࠶㸬୰ᅜᆅ᪉ᕞ㒊 ⏒⿕࡞ᐖࡓࡓࡋᖹᡂ21ᖺ7᭶୰ᅜᕞ㒊㞵࠸࠾㸪ᵽᕝὶᇦ⨨ࡍ᯽ཎ㞵㔞ほ ᡤ ࡣ㛫㞵㔞91mmほ ࡋ㸪ᵽᕝࡣୗὶᕷ⾤ᆅ ࡢ」ᆅⅬỏ℃ࡋ㸪ᗋᗋୗࡏ410Ჷࡢᾐ Ỉ⿕ᐖ⏕ࡓࡌ㸬⿕ࡢࡇᐖࡅ㸪⚟ᒸ┴ࡣ㸪ᖹᡂ22 ᖺᗘᖹᡂ26ᖺᗘࡢ5ᖺ㛫ࡢィ⏬㸪ᗋᾐỈᑐ ⟇≉⥭ᛴᴗ㸦௨ୗ㸪ᗋᑐᴗ㸧⤌࠸㸬 ࡓ㸪ᖹᡂ21ᖺࡢ㞵⅏ᐖዎᶵࡋ㸪ᵽᕝὶᇦ ỈᕷẸ㆟⤖ࡀᡂࡉ㸪ᘏ30ᅇ௨ࡢ㆟ㄽ㔜ࡡ㸪㈓Ỉ㐟Ỉᾐ㏱୰ᚰࡓࡋ㞵Ỉὶฟᢚไ㸪ఫẸ 㛵ಀయࡀඹ⤌ࠕࡃ࠸ὶᇦỈ 1) ࡢᥦゝࡀⅭࡉࡓ㸬ᕷẸ㆟ࡢᥦゝࡣ㸪⚟ᒸ┴ࡀᖹᡂ 25ᖺ⟇ᐃࡓࡋᵽᕝỈ⣔Ἑᕝഛᇶᮏ᪉㔪 2) ⤖ᐇࡋ㸪 ᑗ᮶┠ᶆࡍィ⏬㧗Ỉὶ㔞㸪ὥỈㄪ⠇タㄪ ⠇ศࡣ㏵㸪ὶᇦỈὶฟᢚไศぢ㎸ࡔィ ⏬ࡋ࠸㸬ࡢࡇ࡞࠺㸪ᆅᇦఫẸࡢỈ⎔ቃᑐ ࡍព㆑ࡢ㧗ᛂ࠼ࡃ㸪⚟ᒸ┴ࡣ㸪ᵽᕝᗋᑐ ᴗ࠸࠾㸪ᖹᡂ22ᖺᨵゞ㏻▱ࡉࠕࡓ୰ᑠἙᕝ 㛵ࡍἙ㐨ィ⏬ࡢᢏ⾡ᇶ‽㸦௨ୗ㸪ᢏ⾡ᇶ‽㸧 3) ♧ ࡉࠕࡓከ⮬↛ᕝࡃ✚ᴟⓗ⤌࠸㸬 ᮏሗࡣ㸪ᵽᕝࡢᗋᑐᴗࡅ࠾ከ⮬↛ᕝࡃ ࡢ⤌┤㠃ࡓࡋᢏ⾡ⓗㄢ㢟ࡕ࠺ࡢ㸪≉㸪ᨵಟᚋ ࡢἙ㐨ࡢᏳᐃ㸪℩ῡࡢಖฟ┠ᶆࡓࡋウ ࡢࢫࢭ࠸ࡘሗ࿌ࡍ㸬ࡓ㸪ከ⮬↛ᕝࡃ㐺 ࡓࡋ᪂࠸ࡋἙ㐨Ᏻᐃᕤἲ࠶᪩℩ᕤ㸪℩ῡᕤࡢᑟධ ࠸ࡘሗ࿌ࡍ㸬㸰㸬ᴗᴫせᢏ⾡ⓗㄢ㢟 ᵽᕝᗋᾐỈᑐ⟇≉⥭ᛴᴗࡢᴫせ ᴗࡢ࡞ෆᐜࡣ㸪ὶୗ⬟ຊࡓࡢࡢἙ㐨᥀๐ཬ ࡧἙ㐨᥀๐క࠺ㆤᓊ⿵ᙉ࠶㸬ᴗ༊㛫ᅗ♧ ࡍ㸬ᴗ༊㛫ࡣ5,900m࠶㸪ࡢ༊㛫ࡀᕷ⾤ᆅ ෆὶୗࡋ࠸㸬 ᢏ⾡ᇶ‽ 3) ࡣ㸪୰ᑠἙᕝࡢἙᕝഛィ⏬⅏ᐖᪧ - 283 -

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Transcript of !) á S4 b ² p b v ~) slibrary.jsce.or.jp/jsce/open/00906/2014/20-0283.pdf · 2016. 2. 2. · Ì ]...

, 20 ,2014 6

CONSERVATION MEASURES OF CHANNEL STABILIZATION AND POOL-RIFFLE STRUCTURE RESTORATION IN THE HII RIVER

1 2 3 4 Tomoyuki NAGAI, Morihiro HARADA, Hironori HAYASHI and Kuniharu TAKAHASHI

1 812-0053 1 18 1

2 501-6021

3 819-0395 744 2 1008 4 812-0016 2-4-11

This paper reports a series of actions to conserve channel stabilization and pool-riffle structure in the Hii River disaster restoration works. The Hii River is an urban river which flow through Fukuoka city. First, the outline of heavy rainfall disaster in July 2009 is presented. Secondly, some concerning matters in the improvement plan are discussed. The largest issue was lack of channel stability after changing cross-sectional channel form by riverbed excavation. One dimensional bed deformation analyses were conducted to discuss channel stability and necessity of countermeasure. In result, the river administrator employed two new types of river structure to conserve channel stability and pool-riffle structure in the Hii River. This case study presents a way to resolve the conflict between disaster prevention and ecosystem conservation in urban rivers.

Key Words : pool-riffle structure, channel stabilization, movable bed simulation, rock riffle structure

12.9km

29.1km2

21 7

91mm410

2226 5

21

30

1)

25 2)

223)

5,900m

3)

- 283 -
4)5)

24

1m400m

6)

7)

1/200 1/2,0007 2

(1/640)(14m)

0.9 1.1m

(Leucopsarion petersii) 21km 12

NT

8)

R² = 0.8751

0

5

10

15

20

25

0 500 1000 1500 2000

(m)

(1/X)

0

0.2

0.4

0.6

0.8

1

1.2

0 500 1000 1500 2000

(m)

(1/X)

N

- 284 -
400mm

1m1:2.0

1:1.5

5

B 10 13m HB/H 3

1/3

1,400m 37

10

4k760 6k300 1540m

n=0.032 (70 )

10

500m

8

3)

- 285 -
32 12

1/3

2mm*=2.0 6.0

217

9)

1.6m

10

100

1000

10000

0.01 0.1 1 10

R/d

τ*

Lower Regime,

Upper Regime,

NoMotioon

Transition

- 286 -
2mm* R/d

9)

21 7

3

(rock riffle structure, gravel riffle)

11)12)

13)

12)

13)

( 150-200)

- 287 -
14)

13)

1:1.5

251

2

26

1) ?

16 , pp.17-23, 2010. 2)

2013.( http://www.pref.fukuoka.lg.jp/gyosei-shiryo/houshin-dl.html) 3)

2010. 4)

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5)

B1( ) Vol.70, No.4, I_997-I_1002, 2014. 6)

43-3, pp.148-159., 1970. 7)

17 , pp.113-118., 2011. 8)

, , 43(3), pp.289-296.,1995. 9)

pp.49-60, 2007. 10)

345 /II-1 pp.41-52., 1984.

11) - 12 p.4-5 2001.

12)

ELR2012, p.52, 2012.

13)

, Vol.19, pp.87-92, 2013. 14)

F Vol.66, No. 4, pp. 490-503, 2010.

2014.4.3

- 288 -