河川中・下流域の河道地形

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1 7 * River Configuraion in Middle-Lower Reach of River Bain Hirohi TAKEBAYASHI, Facul of Engineering, Univeri of Tokuhima 1 1 (a (b * akeh@ce.okuhima-u.ac.jp

2 5 3 6 km 7 km

3 Ug =ξ ug +ξ vg, Vg =η ug +η vg (5 u g v g Λ. 9 z z b Λ = 1z z b Λ = λ z b λ 8 10 J = 1 (1 ξ η η ξ hu hu hu + ( ξ + U + ( η + V ξ = J η, η = J ξ, ξ = J η, η = J ξ ( J ξ J η J hu ξ ξ ξ + ( ξ + U + ( η + V J ξ η ξη hv ξ ξ ξ + ( ξ + U + ( η + V J ξ η ξ +ξ z ξη +ξη z = gh + ξ = ξ 10 J J ξ η (6 τbξ Fvξ ξ ξη + ( hσ + ( hσ ρj ρj J ξ J η ξη ξξ + ( hτ + ( hτ J η J ξ ξη ξξ + ( hτ + ( hτ J η J ξ ξ 1 + ( hσ + ξη ( hσ J ξ J η 11 hv hv hv z h h + ( ξ + U + ( η + V Λ + ( ξ + U + ( η + V J ξ J η J J ξ J η J (3 hu η η η hg hg + ( ξ + U + ( η + V + ( ξ + Ug + ( η + Vg = 0 J ξ η ξ J η J hv η η η + ( ξ + U + ( η + V z J ξ η (7 h, h g U V ξ ξη +ξη z η +η z = gh + η J J ξ η τbη Fvη ηξ η + U =ξ u+ξ v, V =η u+η v (4 ( hσ + ( hσ ρj ρj J ξ J η u v ηξ ηη + ( hτ + ( hτ U g V g ξη J ξ J η

4 30 8 ηξ ηη + ( hτ + ( hτ J ξ J η u v σ = ν k, σ = ν k ( ηξ η + ( hσ + ( hσ J ξ J η v u τ =τ =ν + (18 g ρ τ bξ τ bη ξη ν= ( κ 6 uh * (19 k =.07u* (0 τ bξ =ξτ b +ξτ b, τ bη =ητ b +ητ b (8 ν κ k τ τ 15 ub vb τ =τb, τ =τb (9 ub + vb ub + vb τ b =ρu * (10 16 F vξ F vη ξη ng m u + v u* = 1 3 ( u + v or u* = (11 R ( 6+.5ln( hk F u * n m =ξ v F +ξ v F, ξ v Fvη =η Fv +η Fv (1 R k F v F v (11 u v F v = Fv, F v = Fv ( u + v u + v u b v b Fv 1 = Cdvλ v ( u + v h (3 ρ C dv 1.0 ub = ubcoα vbin α (1 λ v (3 vb = ubin α + vbcoα (13 ub = 8.5u* (14 h 17 vb = N* ub (15 r Darc α = arcan ( vu, N * zb zb ug = kg ξ +η (4 r ξ η 14 zb zb v u v u vg = kg ξ +η (5 u u v + v u v ξ η 1 = (16 r ( u + v 3 k g k g σ σ τ τ

5 18 f bk c b E b 19 E d1 1 f d1k 1-λ 4 4 交換層と第 1 堆積層 Ebe 1 = τ の粒径階ごとの質量保存則は, 以下のようである 0 co ( an an * m (8 dm cb θ φ θ ce b bfbk zb + ( 1 λ Fbk J J ce q b bf bk bk ξ ce q b bf bk bηk + ξ + + η + ξ J J J J η 1 + wk( cbek cbk = 0 J E f E = J J d1 d1k d1 Fdk 0 F, 0 bk = fd1 k zb Fbk = fbk, zb 0 (6 31 ここで,d m φ τ *m 交換層厚さ E b は, 河床に十分土砂が存在し, 且つ, 全粒径の土砂が移動する条件では, 平衡交換層厚さと等しくなるが, 粗粒分などが限界掃流力以下の時は, 平衡交換層厚さよりも薄くなる. q bξk q bηk ξη k qbξ k =ξ qbk +ξ qbk, qbη k =η qbk +η qbk (9 q bk q k 19, 1, 4, 0 Fdk = fd1 k zb (7 qbk = qbk coβ k Fdk = fbk, zb 0, qbk = qbk inβ k ( ρu * e u * ck u * ck E b 交換層厚さ,f bk qbk = 1 Kc 1 Kc fbk (31 ( ρ ρ g k f dmk m u* u* k, c b ρ u *e 上面に設定 するため, 土砂濃度 c b は静止堆積濃度 が想定され, 河床の空隙率 1-λが用いられる. さらに, 交換層厚さ E b は, 交換層内の土砂の 90% 粒径程度 の値が用いられている 1. また, 取り扱う現象のスケ ールによっては, 砂河床に対して砂堆の波高を交換 19 層厚 E b として用いられる. つまり, 交換層上面を 河床面と考えた場合, 交換層厚さの物理的意味は u + v 薄れ, 粒度を適切に予測できるように無理のない値 u* e = (3 h を交換層厚さと考えて用いられているようである. 一 6+.5ln dm( 1 * m + τ 方, 河床面を交換層下面に設定した場合, 交換層は掃流砂層となり, c b u *ck k 平衡交換層厚さ E be は, Egahira and Ahida 3 19, 5 bk

6 3 log1019 d 8 k u* ck = u* cm dk dm 0.4 (33 log10 ( 19dk dm d 36ν 36ν m wfk = + gd 3 3 k (43 3 gdk gd u* ck = 0.85u* cm dk dm 0.4 (34 k k 6 c bek Lane and Kaline u w * fk cbek = 5.55 ep fbk ( :ppm(44 wfk u * 7 1, 4 K c 5% 9 ρ + 1coαan θ + in αan θ ρ ρ Kc = 1+ (35 µ k c θ θ k c bk 31 zb z b θ = arcan ξ +η (36 c ( w bk ξ η c = ( 1 e β fkh, β = (45 β D zb z b D θ = arcan ξ +η (37 h ξ η µ k α α= arcan( v b u b (38 hc k J β k hc hc + ( ξ + U + ( η + V ξ J η J in α ΠΘ( u* ck u* an θ anβ k = (39 1 coα ΠΘ( u* ck u* an θ = w fk ( cbek cbk J Π= K ld + 1 µ (40 Dξ + Dξ c (46 + h ξ J Θ = 1 ( 1+ an θ + an θ (41 ξ D ξη + Dξη c Θ =Θ +ρ ( ρ ρ co θ (4 + h ξ J η K ld (0.85 Dξη + Dξη c w fk Rube + h η J ξ h

7 33 (m (m Dη + Dη c h η J η D D (hr ce b b zb + ( 1 λ 6 J J 9.5 n q n ξce b b bk ξ η q ce b b bηk J k= 1 J (47 Cae 1 ξ η J k= 1 J 9 n Cae 1 + wk ( cbek cbk = k = 1 J 8 n (m 3 / (m (m 3 / km km.1km 1999

8 34 (m m/ (m (m 0h (56 m3/ m/ (m h (6011 m3/ (m 5000 Cae m/ (m h (6011 m3/ Cae 8 49km 49km 9.8km 15.6km Cae 1 Cae - 9.8km 15.6km 3cm 10 49mm Cae km Cae 1 Cae (31 Cae 1 Cae 1 Cae Cae Cae Cae 1 Cae

9 植生域 基準点からの高さ (m Cae 1 ( Cae ( Cae 1 ( Cae ( 左岸からの距離 (m 9 8.km 30 8.km Cae Cae 1 Cae 1 160m 1 Ohmori, H.: Eroion rae and heir relaion o Cae vegeaion from viewpoin of world-wide diribuion, Bullein of he Deparmen of Geograph, Univeri of Toko, 15 ( ,. 8 ( Blue Back ( :, Vol. 677 No.II-55 ( Okabe, T. and Takebaahi, H.: Numerical eimaion of counermeaure again edimenaion in Maaki Dam Reervoir, Japan, Environmenal Hdraulic and Suainable Waer Managemen, Lee & Lam 河床材料の平均粒径 (m

10 36 (ed, ( Takebaahi, H., Egahira, S. and Okabe, T.: 7 Braided ream formed on bed wih non-uniform edimen, Proc. 3nd IAHR 55 ( Nagaa, N., Hooda, T. and Muramoo, Y.: Numerical anali of river channel procee wih bank eroion, Journal of Hdraulic Engineering, ASCE, Vol.16, 4 ( Smpoium on River, Coaal and Euarine Morphodnamic, ( ( ( ( Takebaahi, H., Egahira, S. and Okabe, T.: 467/II-3 ( Egahira, S. and Ahida K.: Unified view of he Numerical anali of ream abili proce mechanic of debri flow and bed-load, on bed wih non-uniform edimen, Journal of Advance in Micromechanic of Granular Hdrocience and Hdraulic Engineering, Maerial, (Edied b H.H.Shen e al. Elevier, Vol., ( Zimmermann, C.: Roughne effec on he flow direcion near curved ream bed, Journal of Hdraulic Reearch 15 No.1 ( Engelund, F.: Flow and bed opograph in channel bend, Jour. of H. Div. ASCE, Vol. 100, No. HY11 ( Shimizu,Y. and Iakura,T.: Calculaion of flow ( Kovac, A. and Parker, G.: A new vecorial bedload formulaion and i applicaion o he ime evoluion of raigh river channel. J. Fluid Mech. Vol. 67, pp , Egiazaroff, I. V.: Calculaion of Nonuniform Sedimen Concenraion, Proc. ASCE, Vol. 91, No. HY4 ( and bed deformaion wih a general 41 ( non-orhogonal coordinae em, Proc. of XXIV IAHR Congre, Madrid, Spain, C- ( Nezu, I. and Nakagawa, H.: Turbulence in open channel flow, IAHR Monograph, Balkema, Roerdam, The Neherland, ( ( Rube, W. W.: Seling velociie of gravel, and and il paricle, American J. of Science, 5 ( Iakura, T. and Kihi, T.: Open Channel 39 (1995 Flow wih Supended Sedimen, Proc. ASCE, Vol. 106, No. HY8 ( Lane, E. W. and Kaline, A. A.: Engineering calculaion of upended edimen, Tran. ( A.G.U., ( Roue, H.: Modern Concepion of he Mechanic, of Turblence, Tran. ASCE, 10 ( ( ( (

医系の統計入門第 2 版 サンプルページ この本の定価 判型などは, 以下の URL からご覧いただけます. このサンプルページの内容は, 第 2 版 1 刷発行時のものです.

医系の統計入門第 2 版 サンプルページ この本の定価 判型などは, 以下の URL からご覧いただけます.   このサンプルページの内容は, 第 2 版 1 刷発行時のものです. 医系の統計入門第 2 版 サンプルページ この本の定価 判型などは, 以下の URL からご覧いただけます. http://www.morikita.co.jp/books/mid/009192 このサンプルページの内容は, 第 2 版 1 刷発行時のものです. i 2 t 1. 2. 3 2 3. 6 4. 7 5. n 2 ν 6. 2 7. 2003 ii 2 2013 10 iii 1987

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