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3 ,,,,,,., uid, (uid dynamics) Newton. (geophysical uid).,.,. 2,,,. 1 2, II,.
4 % 40 % ,. 1., ( ) ( ),.,. 30.,,...,,", ". ( ) 2., (, 21),.,,.,. 3 ", (, " 3. G. K. Batchelor, An Introduction to Fluid Mechanics (Cambridge U. P.) 3
5 1.3. 5, Journal of Fluid Mechanics 1999.,. 4. L. D. Landau and E. M. Lifshitz, Fluid Mechanics (Pergamon Press) Landau - Lifshitz 1. Landau S. H. Lamb, Hydrodynamics (Cambridge U. P.) Sir ,.,. 2,. 2. J. Pedlosky, Geophysical Fluid Dynamics (Springer). 3. R. Salmon Lecture on Geophysical Fluid Dynamics (Oxford U. P.). Hamilton. Review Hamilton. 4., 5., : (, 13) 1., ( 2 ) ( ).
6 iwayamakobe-u.ac.jp 1.5, \ ",
7 (Cartesian coordinate).,, nonation 2.2.1, ~ A A x y z i j k e 1 e 2 e 3 e 1 = i e 2 = j e 3 = k (2.1). x y z. 1,.
8 r x. 2, r r = x i + y j + z k (2.2) x y z r x y z r =(x y z) (2.2). 3 (2.1) x = x 1 e 1 + x 2 e 2 + x 3 e 3 (2.3) v v = u i + v j + w k (2.4). u v w u x y z. 4 (2.1) v = v 1 e 1 + v 2 e 2 + v 3 e 3 (2.5) , (westerly: u > 0) (easterly: u < 0) (northerly: v<0) (southerly: v>0), (eastward: u >0) (westward: u <0) (southward: v<0) (northward: v>0),.
9 2.3. summation rules, Einstein's notation t x y z t x y z x 1 x 2 x r. r = i x + j y + k z (2.6) = i x + j y + k z (2.7) = e e e 3 3 (2.8) 2.3 summation rules, Einstein's notation 2, 1 3. x = x 1 e 1 + x 2 e 2 + x 3 e 3 = 3X i=1 x i e i = x i e i : (2.9) P. 1: 2 x i e i = x j e j = x k e k. 2: 2, 1 2. : v = v i e i : (2.10) r = e i i : (2.11) df(x 1 x 2 x 3 ) = dx 1 ( 1 f)+dx 2 ( 2 f)+dx 3 ( 3 f) = dx i ( i f): (2.12)
10 Kronecker 2 Kronecker : ij ( 0 (i j ): (2.13) 1 (i j ): Kronecker ij e i e j (2.14). ra = (e i i ) (A j e j ) = ij i A j = j A j : (2.15) : Kronecker,. 1. ii 2. ij A j 2.5 Eddington 3 Eddington : " ijk 8 >< >: 1 (i j k) =(1 2 3) (2 3 1) (3 1 2) : ;1 (i j k) =(3 2 1) (2 1 3) (1 3 2) : 0. (2.16) " ijk = ;" ikj : (2.17) " ijk =1 (i j k) =(1 2 3), " ijk = ;1 (i j k) = (1 2 3).
11 2.5. Eddington 11 A = 0 B a 11 a 12 a 13 a 21 a 22 a 23 a 31 a 32 a 33 1 C A, Eddington deta = a 11 a 12 a 13 a 21 a 22 a 23 a 31 a 32 a 33 = " ijk a 1i a 2j a 3k : (2.18) A B.. A B = ra = e 1 e 2 e 3 A 1 A 2 A 3 B 1 B 2 B 3 = " ijk e i A j B k : (2.19) e 1 e 2 e A 1 A 2 A 3 = " ijk e i j A k (2.20) 1. (2.18). 2., ij " ijk., ij " ijk. (a) B A = ;A B, (b) A (B C) = B (C A) =C (A B) 3. " ijk " ilm = jl km ; jm kl.
12 Gauss S V, 2. 5 I: v : ZZZ ZZ rvdv = v ds (2.21) V S, ds n, ds. II: Q : ZZ S Qn i ds = ZZZ, n i n i. V Q x i dv (2.22) I Gauss. : (2.22). 2.7 Stokes v, : I C v dr = ZZ S (rv) ds: (2.23) S C., C, S., S. n S. S, C,. S, ZZ. v. 5,. S (r v) ds =0 (2.24)
13 2.7. Stokes 13 n S C 2.1: Stokes C, C S,. Stokes. Stokes C., (2.23).,. Stokes,., ( ), ( ). ( ), Stokes ( )., Stokes.. ( ), (2.24), Stokes. (, ( ).) ( ), (2.24) ZZ S ( x v ; y u)dx dy (2.25)., S, x y. (.)
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15 15 3, ( ),. 3.1, (, ),,..,.,., P, P v., P r, P (r) Nm (3.1) v., m,, N v. N v t.,, 2. L (v) 1=3 1. L K = L (3.2), K 1. K Knudsen. 1.
16 16 3 P ρ (r,t) P 3.1:. P, P. T 2. :., 0 o C 10 ;7 m 10 ;10 s L =1 10 km T 12 h ( ) L 10 3 km T 10 day. (uid parcel/uid particle)., v.,,,.,,,. 3.2, Newton,,., 2,.
17 ,,,.,.. (body force).,, Coliois,. (surface force),,.,,.. (stress). MKS Nm ;2. \ ", N. P, P S, S P ( n ), Tn. Tn S, n.,. Tn 2 1., 2 (tensor), 9, ij (i j =1 2 3),., ij. x j, x j x i ij.,. T;n = ;Tn (3.3), (tangential stress), (shear stress), (normal stress)., (pressure), (tension). 3.3,,, : \
18 18 3 τ 33 Τn τ 13 P τ : P z., P T n ,.",.,,,.,,.. \, 0,.", 0,. {[ ] { [ :] P, PAB,. PA, PB, AB p 1, p 2, p 3,., PA= l 1 PB = l 2, 6 A = 1 6 B = 2. : AB, p 1 l 1 sin 1 ; p 2 l 2 sin 2 =0: sin 1 l 2 = sin 2 l 1
19 , p 1 = p 2 : P. : O(l 2 ),., l,.,. : D'Alembert.,. {[ ] { P p 1 p 2 A α α 1 2 B p 3 3.3: P. 3.4,.
20 , (viscosity). 3 (inviscid/perfect/ideal uid),.,., ij = ;p ij : (3.4),. (viscous uid).,. Newton (Newtonian uid).. Newton e ij ; 13 e kk ij ij = ;p ij +2 e ij = 1 ui + u j 2 x j x i (3.5) (3.6). (coecient of viscosity). Newton. (3.5) 0, (3.4). : (3.5),.,. (3.5),,. 4,,.,, 5,, 3,,,,.. 4,,, 2,. 5. 1, 1.
21 , ,,.,.,,.. 6,,,., (compressible uid). (incompressible uid).. 7,,. 8 : 1. p = RT, T ds = c v dt + p d( 1 ), p p = C (Poisson )., T S c v R C,,,,, c v c p = c v + R, = c p =c v. 2., 300 K c =. (a) r p S. 6 c entropy,. c p (p=) S. 7,. 8 Bussinesq.,.. r p S
22 22 3 (b) c v = 5R c 2 p = 7R R = 287 J 2 K;1 kg ;1, c. (,.) v, E, S,... p, T,,. 9,, 2.,, , 5, 5,. 5,,.,,,. 3., ,, ,,,,,.,,, v,, T, p.. 10 d, d
23 Lagrange (Lagrange ),,., t = t 0 (a b c) t (x y z). x y z a b c t, x = f 1 (a b c t) y = f 2 (a b c t) (3.7) z = f 3 (a b c t). f 1 f 2 f 3,. t 0 t 0 =0. (3.7) (a b c), (a b c) material coorinates. (a b c),,, (a b c).. 11 N, i (i =1 2 :::N) t (x i y i z i ). i ( ). 2. i, (a b c).., ( ). Lagrange,, Lagrange, material dierentiation D Dt. Lagrange, F Lagrange DF F Dt = t a b c (3.8) 11 Lagrange naive Hamilton Hamilton.
24 24 3 (Lagrange ) ( ) (a b c) : i D Dt d dt 3.1: Lagrange. d dt. Euler (Euler ) t, (x y z) v T p :::.,.,,..,. Euler Lagrange, x y z Lagrange, Euler. Lagrange Euler F Euler F (x y z t). Lagrange Euler. t r = (x y z), t +t r + vt =(x + ut y + vt z + wt). F F, F = F (x + ut y + vt z + wt t +t) ; F (x y z t) F = t + u F x + v F y + w F ; t + O 2 (t) z DF Dt F = lim t!0 t = F t + u F x + v F y + w F z (3.9). O ((t) 2 ) t. F
25 , Lagrange Euler D Dt = t + u x + v y + w z = t + v r (3.10). (3.10) 2. v r rv r.,. v r, ( v r ), rv. 2. Langrange Euler a b c t x y z t x y z p T ::: u v w p T ::: Lagrange, D Dt t t + v r : 1. f(a b c), f=a, b c, a f. (f=a) b c,,,. Lagrange =t Euler =t. 2. Lagrange Euler (3.10) v r ,.,
26 26 3,,. g, N=m 3, N=m 2 g.,,,,.. 3.4, ( ds, dz)., ( ) ( ). 12 p(x y z +dz)ds, p(x y z)ds. g ds dz.,, ;p(x y z +dz)ds ; g dz ds + p(x y z)ds =0 (3.11). dz, p(x y z +dz) p(x y z +dz) =p(x y z)+ p z dz + O(dz2 ) (3.12) Taylor., O(dz 2 ) dz 2. (3.11) 1, ; p z + O(dz2 ) ; g dz ds =0: (3.13) dz ds, dz ds! 0., O(dz 2 ), ; p ; g =0 (3.14) z. (3.14) (hydrostatic balance), :. 13., Coriolis (geostrophic balance).
27 (3.14), p., x y ; p ; p. x y, ;rp.,, (pressure gradient force). p(z+dz) ds z+dz z p(z) ρg ds dz ds ds 3.4: ds, z z +dz., ds, dz 0 (, )., (3.11), ;p(x y z +dz)ds ; 0 g dz ds + p(x y z)ds (3.15). 1 3 g ds dz., (3.15) ( ; 0 )gds dz (3.16)., > 0,,, (3.16) > 0,.,
28 [ ], : (buoyancy force) \ ( ),,.., ( )"., (3.15) ;p(x y z +dz)ds + p(x y z)ds (3.17). (3.17), ;p(x y z +dz)ds + p(x y z)ds = gdsdz (3.18),..
29 29 4 (1): 3.5.1, v 2,,,,.,,. (equation of continuity). Euler Euler., Lagrange Lagrange, Euler. 4.1 Euler S. 1 S V. V, ZZZ V dv. V, d dt ZZZ V dv. V S V. ds, ds v n., v n v v n = v n ( 4.1 )., 1 Euler,,.
30 30 4 (1): S V ; ZZ S v n ds = ; ZZZ V r(v) dv. S n,. Gauss (2.6 ). d dt ZZZ V dv = ; ZZZ V r(v) dv:, ZZZ V t + r(v) dv =0. V, 0., + r(v) =0 (4.1) t.. Lagrange D Dt., D + rv =0 (4.2) Dt : 1. (2.3 ), (4.1). 2. Lagrange D, (4.1) (4.2) Dt. :,, D Dt =0, rv =0 (4.3).
31 4.2. Lagrange 31 n S ds V n ds v v.n 4.1: V ds. 4.2 Lagrange t = t 0 S 0 V 0,, t S V. Lagrange,. : ZZZ ZZZ 0 dx 0 dy 0 dz 0 = dx dy dz: V 0 V (a b c) t = t 0 (x 0 y 0 z 0 ), abc- : (x y z) (a b c),. = = ZZZ ZZZ V 0 0 dx 0 dy 0 dz 0 = V dx dy dz = ZZZ ZZZ V 0 0 da db dc V 0 (x y z) da db dc: (a b c), xyz abc Jacobian (x y z) (a b c) = 0 (4.4) Lagrange., 0 a b c. 2 2, 4.3.
32 32 4 (1): : = 0, (x y z) (a b c) =1 (4.5). 4.3 Euler Lagrange Euler Lagrange,. Lagrange (4.4) Jacobian, J (x y z) (a b c) (4.6)., (4.4) J = 0. (4.4) Lagrange, 2 chain rule DJ Dt ; = Dx y z Dt (a b c) = = ( ; Dx Dt y z (x y z) u x + v y + w z D Dt J + DJ Dt + ; x Dy Dt z (a b c) ; + x Dy z Dt (x y z) J =0: (4.7) ; + x y Dz Dt (a b c) ; + x y Dz Dt (x y z) ) (x y z) (a b c) = (rv) J (4.8). 3 (4.8) (4.7), Euler D + rv =0 Dt. Lagrange Lagrange Euler. 3 D=Dt Lagrange, a b c t (t ) a b c, x y z.
33 4.3. Euler Lagrange 33 Euler Lagrange, (4.2) Lagrange, Lagrange ( ) ( ). (4.8), rv = J ;1 DJ=Dt, (4.2) D Dt + J DJ Dt =0: D (J) =0 (4.9) Dt. J 0. Lagrange D=Dt =( t ) a b c, 0 a b c.
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35 35 5 (2): \, ", Newton,. Euler Euler. Euler Lagrange, Euler (x y z) Lagrange (a b c), Lagrange. 5.1 Euler (2.3 ). S. R S V. V i v V i dv., V. d dt ZZZ V v i dv. i ij, ZZ S ij n j ds. i K i V i ZZZ V K i dv
36 36 5 (2):. S V. " ". Euler, ; ZZ S (v i ) v j n j ds. 1 V, V, S S., d dt ZZZ V v i dv = ZZZ V K i dv + ZZ S ij n j ds ; ZZ S (v i ) v j n j ds (5.1) 2.6 Gauss., ZZ ij n j ds ; S. ZZZ V ZZ S (v i ) v j n j ds = (5.1) t (v i) ; K i ; ZZZ x j ij + V x j ( ij ; v i v j )dv (v i v j ) dv =0 (5.2) x j. V,.,. t (v i)+ x j (v i v j )=K i +. (5.3) : t (v i) = v i t + v i t x j (v i v j ) = v j v i x j + v i x j ij (5.3) x j (v j ) : (4.1). (5.3) vi t + v j v i = ij + K i x j x j , V, v n ds., V, v n ds v.
37 5.1. Euler 37 v i t + v j v i x j = 1 ij + K i x j (5.4a).. Lagrange Dv i Dt = 1 ij + K i : x j (5.4b), ij = ;p ij (5.5), (5.4) v i t + v j v i x j. (5.6a) = ; 1 p x i + K i t + v r v = ; 1 rp + K (5.6b) (5.6a). (5.6) Euler (Euler's equation). Newton (5.4) v i t + v j v i x j (3.5) Newton, = ; 1 p + 2 v i + 1 x i x 2 j 3 vj + K i (5.7a) x i x j t + v r v = ; 1 rp + v + 1 r (rv)+k 3 (5.7b). = = (kinematic viscosity). (5.7) Navier-Stokes (Navier-Stokes equation),.
38 38 5 (2): 5.2,.. (5.4a) v i,, t v i v i t + v iv j v i x j = v i x j ij + v i K i 1 2 v iv i + x j 1 2 v iv i v j ; 1 2 v iv i., t + v j x j {z } ij v i = ( ijv i ) v i ; ij x j x j x j = ( ijv i ) ; ij e ij (5.8) x j ij ( ij = ji )., e ij = 1 ui + u i 2 x j x j (5.9)., T = 1 2 v iv i, (T ) t + (T v j) x j = ( ijv i ) x j + v i K i ; ij e ij (5.10).,, ( ) K ( ),.,. (5.10),., ij.
39 , ij = ;p ij, (5.8) ; (pv j) x j + pe jj., (5.10) (T ) t + (T + p) v j x j = v i K i + pe kk (5.11a). (T ) t + rf(t + p) vg = v K + prv (5.11b) Newton (3.5) Newton, (5.8), ;pv j +2 x j.,, (5.10) e ij v i ; 13 e kkv j ; ;pe jj +2 e ij e ij ; 13 e kke jj (e ij ; 1 3 e kk ij ) 2 = e ij e ij ; 2 3 e kk ij e kke kk ij {z} ij =3 (T ) t = e ij e ij ; 1 3 e kke jj : (5.12) + (T + p) v j ; 2 e ij v i ; 13 x e kkv j j = v i K i + pe kk ; (5.13) =2(e ij ; 1 3 e kk ij ) 2 (5.14) (dissipation function),....
40 40 5 (2): 5.3 Lagrange 5.1 Euler (5.6) Lagrange. (5.6) Lagrange, Dv Dt = ;1 rp + K (5.15). Euler, K p. Lagrange 2 r. ;rp Lagrange t a b c 2 (a b c). (5.6) x- a x, (5.6) y- a y, (5.6) z- a z rp : x p a x + y p a y + z p a z = a p,. Lagrange a-, (5.6) x- a x, (5.6) y- a y,(5.6) z- a z : ; 2 t x ;K x a x + ; 2 t y ;K y a y + ; 2 t z ;K z a z = ; 1 ap: b-, (5.6) x- b x, (5.6) y- b y, (5.6) z- b z, c-, (5.6) x- c x, (5.6) y- c y, (5.6) z- c z. : 2 x x t ;K 2 x a + 2 y y t ;K 2 y a + 2 z z t ;K 2 z a = ;1 p a (5.16) 2 x x y z p t ;K 2 x b + 2 y t ;K 2 y 2 x x t ;K 2 x c + 2 y t ;K 2 y b + 2 z t ;K 2 z y c + 2 z t ;K 2 z b z c = ; 1 = ; 1 b (5.17) p c : (5.18)
41 41 6 (3) \,,,,, ",., Euler. 6.1 S. S V. R V ( ) (T + U) dv V., T U. V d dt ZZZ V (T + U) dv.. V, ZZZ V v i K i dv + ZZ S v i ij n j ds. 1 S V, Euler, ; ZZ S f (T + U)g v j n j ds (6.1).,,. (thermal diusivity), 1 F, r, F r.
42 42 6 (3). S V. ZZ ; j n j ds (6.2) S. 2, J. V, V, S, S V,, d dt ZZZ V (T + U) dv = ZZZ ; + ZZ V S ZZZ v i K i dv + ZZ S v i ij n j ds [f (T + U)g v j + j ] n j ds, 2.6 Gauss ; ZZZ V V J dv (6.4) x j (T v j + Uv j ; v i ij + j )dv (6.5). V, t f (T + U)g + f (T + U) v j g = (v i ij ) ; j + v i K i + J (6.6) x j x j x j. (5.10) (6.6), t (U)+ f(u) v j g = ij e ij ; j + J (6.7) x j x j., (6.7) Lagrang. DU Dt = 1 ije ij ; 1 j x j + J (6.8) 2, Fourier. Fourier.. = ;rt (6.3)
43 , ij = ;p ij, (6.8). ij e ij = ;pe jj = ;p v j x j (6.9) 1 D Dt = ; v j x j (6.8) DU Dt + p D Dt 1 = ; 1 r + J (6.10)., (6.10), U + p( 1 )=Q, Lagrange D. Dt Newton Newton, (6.8). (6.8) DU Dt + p D Dt ij e ij = ;pe jj + (6.11) 1 =; 1 r + J (6.12),,,. (5.13).
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45 ,, 3, 5,,, v, p, U 6. 1,. ( ), 2, 5., , : p = RT: (7.1) (7.1). n kmol PV = nr T (7.2)., R (R =8:314times10 ;3 JK ;1 kmol ;1 ). V m kg, M 1 Fourier T, 7. 2, Boussinesq.
46 46 7, (7.2) P = m V R M T (7.3). = m=v, (7.1) (7.3) R = R M (7.4). ( 28) 75.5 %, ( 32) 23.1 %, ( 40) 1.3 % 3, M =28 0: : :013 = 28:96. R = R =28:96 = 287J K ;1 kg ;1.,, R Boussinesq = f(p T ) T 0, p 0 Taylor, 1 f f = f(p T ) = f(p 0 T 0 )+ p, 1 0 = 0 + ( = 0 p T T p p T (p ; p 0 )+ T (p ; p 0 )+ T =0,, p T p (T ; T 0 ) (p ; p 0 )+ 1 0 T (T ; T 0 ) p (T ; T 0 ) = 0 [1 ; (T ; T 0 )] (7.5) ; 1 (7.6) 0 T 3 80 km. p )
47 (7.5) Boussinesq,,.,,. 4,, = 0 [1 ; (T ; T 0 )+(s ; s 0 )] (7.7) ; 1 (7.8) 0 s p T., s (salinity). s, 1kg.,,, (coecient of saline contraction). 7.3, v., p.,, = F(p) (7.9) f(p ) =0 (7.10),,,. (7.9) (7.10) (barotropic uid). (7.10).,. (baroclinic uid).,, barotropic uid ( ( ) ),, baroclinic (7.6),,., < 0.,,. 0. T p
48 D =0, (incompressible homogeneous Dt uid), = const: (7.11),. Newton,, P = p=. Dv Dt = ;rp + r2 v + K (7.12) rv =0 (7.13).,, Navier-Stokes ,. 1. T =const. p / (7.14) 7.3.3,. p,, S p = p 0 0 exp S ; S0 C v (7.15)
49 ,. C v C p = C p =C v. (S = S 0 ), (7.15). p p 0 = 0 (7.16) du = TdS; pd( ;1 ), p = RT, du = C v dt, (7.15). (7.16) Poisson. Poisson, T p, R=Cp T 0 T = p0 (7.17) p., T 0 p (7.17) p R=C p T = const (7.18), T 0, p 0,, T 0 (potential temperature),., z p(z), T (z) p 0 ( p 0 = 1000hPa ),, T 0, z.,., (z),.
50 50 7 S S = C p ln +const (7.19) , K, K = ;gk. 5, (5.7b), 1 rp = ;g k: (7.21), 0,., dp(z) dz = ;g: (7.22) (7.22) (7.1). 6 z, (geopotential), Z =g 0 (geopotential hight) (z) Z z 0 gdz: (7.23), g 0 g 0 =9:81ms ;2. z. 5, g. g g = GM (a + z) 2 : (7.20), G, M, a, z. 6 (7.22) z,.
51 (7.23) z p., (7.22) p T. Z p(z) (z) ; (0) = ;R Tdln p: (7.24) p(0) (7.24) (hypsometric equation). (7.24), p 1 p 2 (, (thickness)) 7 Z T Z(p 2 ) ; Z(p 1 )=; R g 0 Z p2 p 1 Tdln p (7.25). ( ),, (7.25),., p 1 p 2 ht i ht i R p2 p R 1 p2 p 1 Tdln p d ln p (7.26). Z T = ;H ln(p 2 =p 1 ) (7.27) H R ht i g 0 (7.28)., p(z) =p(0) e ;Z=H (7.29),. H (scale hight), e ;1. 255K 7km. 7 p 1 >p 2, p 1 p 2.
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53 n, n., t =0,., k m, m d2 x dt 2 = ;kx (8.1) x(t) = A cos(!t)+b sin(!t)! = k=m: (8.2), A B t =0 x(0) _x(0).,. 1, 2 t 2 (x t) =c 2 2 x 2 (x t) (8.3) (x t) =G(x ; ct) +H(x + ct) (8.4). G H. 1,. 0 x L, (0 t)= (L t) =0, Fourier. Fourier, G(x ; ct), H(x + ct). 2, 2, 2, 2 ( (x 0) t (x 0)), 2 ( ). 3, 1979:,, 223 pp.
54 54 8 (8.4) (8.3). 4 (, ),,. Euler, Euler 1, t =0 v p.,. 8.2,. P v, P n.,,, v n =0 (8.5). 5 z = h(x y), r(h;z), (8.5). v r(h ; z) = Dh Dt ; Dz Dt =0 w = Dz Dt = Dh Dt (8.6) 8.3 2, ( 2 ). 4 : = x ; ct = x + ct,. t x 5 v 0, v 0, (8.5)., (v ; v 0 ) n =0.
55 F (x y z t) =0 (8.7). 2.,., P t v t, F (x + u t y + v t z + w t t +t) =0. F (x + u t y + v t z + w t t +t) = F (x y z t) {z } =0 DF Dt + DF Dt t +O(t2 )=0 = 0: (8.8) 8.4
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57 57 9 (4) 9.1, 5.1 (5.6).,. 1??,, ( Coriolis )., dv dt d 0 rv, dt Coriolis ((??) )., d dt Lagrange D Dt. Euler v Lagrange : Dv Dt ;! Dv Dt +2 v + ( r): (9.1)??, prime,, r., Euler, Lagrange Euler v t + v rv +2 v = ;1 rp + K ; ( r) (9.2).,, (9.2). 1 Newton, K,., Landau, L. D. & Lifshitz, E. M., Fluid Mechanics. 2 nd. Ed. Pergamon Press p.48 { 49..,.
58 58 9 (4) r: () r: : () :, ( + = ) 2 : () : 9.1: ,,,,,.,. ( r), 3 (r ),., r,,,. r, a, z = r ;a.. e r (e ϕ)e λ e ϕ r (e (θ) θ ) ϕ (ϕ)λ 9.1:..
59 a, M., z (eective gravity) g. 3 a2 g ; (a + z) 2 g e r + 2 (a + z) cos e : (9.3) e r ( r), e ( z). e. g G. Ω e = cos e r ; sin e (9.4) g = GM a 2 (9.5) e ϕ g* ϕ δ g e r eρ - Ω XΩX r tangential plan 9.2:,,,. 9.2, (;e r ),, (, e r ) 2 Coriolis,. 3 gravitational force,, gravity force, gravity.
60 60 9 (4).., z =0. e r = cos ;1 g (;g e r ) g jgj g ; = cos ;1 2 a cos 2 p (g ; 2 a cos 2 ) 2 +( 2 a cos sin ) 2! (9.6). 4 a =6: m =7:3 10 ;5 s ;1 g =9:8ms ;2 (9.6), 45 =9:9 10 ;2 ( 6 ). 1km 1.7 m,.,,,, (gioid),,.,. 6 jgj (9.3),. 7, z a jgj. 8, 4 g (;g e r ) = ; ;g e r + 2 a cos e (;g e r ) = g 2 ; 2 a cos (cos e r ; sin e ) g e r = g 2 ; g 2 a cos 2 jgj = p (g ; 2 a cos 2 ) 2 +( 2 a cos sin ) 2 5 6: m, 6: m. 6,,. 7 (9.3) jgj 3:4 10 ;2 ms ;2. 9:78 m s ;2, 9:83ms ;2. (, M.L. Salby. Fundamentals of Atmospheric Physics. Academic Press, 1996,,,,, , O(10 2 )km. O(10)km., 6400 km.
61 , (g ' g 0 =9:806ms ;2 ). (9.6), sin cos O(10 ;1 ), 2 a=g 1, 2 a sin(2)=(2g ).. (Taylor.) 9.4,.,,. ( ),, g = ; a2 (a + z) 2 g 0 e r (9.7). ( ),, Coriolis. Euler (9.2) v t + v v t + v v r t + v 1 v r cos + v 1 v r cos + v 1 v r r cos + v 1 v r + v v r v v r + r r ; v v tan r {z } 1 ; 2 sin v +2 cos v {z } r = ; 1 y1 1 v r + v v r + 2 sin v = ; 1 1 v r r + v v r r v rv r + r 1 r r ; v2 1 r cos + v2 tan r {z } 2 p + K (9.8) p + K (9.9) + v2 {z r } 3 ;2 cos v {z } y2 = ; 1 p r ; g + K r (9.10). K =(K K K r ) K K. *, r,
62 62 9 (4) (curvature term) ,.,,. 0, 0. 10, (9.8) (9.10). 1.,,, x y z, x y z u v w.,, x = r cos( 0 )( ; 0 ) y = r( ; 0 ) z = r ; a (9.11) x = 1 r cos y = 1 r z = r (9.12) u = v v = v w = v r (9.13).,. 2.,, (9.8) (9.10) 1=r, 1=a., y1. z (, r ),., y1,, y2.,, Coriolis. y1 y2, y1 y2, Coriolis. 3., 11 (9.8) (9.10) (* ). 4. Coriolis 2 sin, Coriolis, f., 0 9 (9.8) (9.10),,. 10,. 11
63 , f 0 Taylor y 1. f = 2 sin ' 2 sin( 0 + y=a) ' f 0 + y (9.14) f 0 2 sin 0 (9.15) 2 cos 0 : (9.16) a, =0, f. 12,,., f = f k. u t + u u x + v u y + w u z ; p fv= ;1 x + K x (9.17) v t + u v x + v v y + w v p z + fu= ;1 y + K y (9.18) w t + u w x + v w y + w w p z = ;1 z + K z ; g (9.19) v t + v rv + f v = ;1 rp + g + K (9.20),, Coriolis (9.20).,, Coriolis (y ), (9.20) Coriolis f (9.14) (9.16). 2 4,,,.,,,.,,., 12 f 2 f = f 0 + y; 1 2 y2 2 sin 0 = a 2, [Yang, H., Wave Packets and Their Bifurcations in Geophysical Fluid Dynamics, Springer, 1990, 247pp.]
64 64 9 (4) L 1000 km = 10 6 m H 10 km = 10 4 m U 10 m s ;1 W 10 ;2 ms ;1 T 1day 10 5 s P 10 3 Pa 1kgm ;3 9.2:.,.,,,.,,.,,. 9.2,, (9.8) Coriolis 2 sin v, 2 cos v r. (9.9) Coriolis,.
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