trunk/dyn3d/tau2alpha.f

module tau2alpha_m

    IMPLICIT NONE

    REAL lat_min_guide, lat_max_guide

contains

  SUBROUTINE tau2alpha(type, pim, pjm, factt, taumin, taumax, alpha)

    USE dimens_m, ONLY : iim, jjm
    USE paramet_m, ONLY : iip1, jjp1
    USE nr_util, ONLY : pi
    USE comgeom, ONLY : cu_2d, cv_2d, rlatu, rlatv
    USE serre, ONLY : clat, clon, grossismx, grossismy

    !   arguments :
    INTEGER type
    INTEGER pim, pjm
    REAL factt, taumin, taumax
    REAL dxdy_, alpha(pim, pjm)
    REAL dxdy_min, dxdy_max

    !  local :
    REAL alphamin, alphamax, gamma, xi
    SAVE gamma
    INTEGER i, j, ilon, ilat

    LOGICAL first
    SAVE first
    DATA first/ .TRUE./

    REAL zdx(iip1, jjp1), zdy(iip1, jjp1)

    REAL zlat
    REAL dxdys(iip1, jjp1), dxdyu(iip1, jjp1), dxdyv(iip1, jjm)
    COMMON /comdxdy/dxdys, dxdyu, dxdyv

    IF (first) THEN
       DO j = 2, jjm
          DO i = 2, iip1
             zdx(i, j) = 0.5*(cu_2d(i-1, j)+cu_2d(i, j))/cos(rlatu(j))
          END DO
          zdx(1, j) = zdx(iip1, j)
       END DO
       DO j = 2, jjm
          DO i = 1, iip1
             zdy(i, j) = 0.5*(cv_2d(i, j-1)+cv_2d(i, j))
          END DO
       END DO
       DO i = 1, iip1
          zdx(i, 1) = zdx(i, 2)
          zdx(i, jjp1) = zdx(i, jjm)
          zdy(i, 1) = zdy(i, 2)
          zdy(i, jjp1) = zdy(i, jjm)
       END DO
       DO j = 1, jjp1
          DO i = 1, iip1
             dxdys(i, j) = sqrt(zdx(i, j)*zdx(i, j)+zdy(i, j)*zdy(i, j))
          END DO
       END DO
       DO j = 1, jjp1
          DO i = 1, iim
             dxdyu(i, j) = 0.5*(dxdys(i, j)+dxdys(i+1, j))
          END DO
          dxdyu(iip1, j) = dxdyu(1, j)
       END DO
       DO j = 1, jjm
          DO i = 1, iip1
             dxdyv(i, j) = 0.5*(dxdys(i, j)+dxdys(i+1, j))
          END DO
       END DO

       CALL dump2d(iip1, jjp1, dxdys, 'DX2DY2 SCAL  ')
       CALL dump2d(iip1, jjp1, dxdyu, 'DX2DY2 U     ')
       CALL dump2d(iip1, jjp1, dxdyv, 'DX2DY2 v     ')

       !   coordonnees du centre du zoom
       CALL coordij(clon, clat, ilon, ilat)
       !   aire de la maille au centre du zoom
       dxdy_min = dxdys(ilon, ilat)
       !   dxdy maximale de la maille
       dxdy_max = 0.
       DO j = 1, jjp1
          DO i = 1, iip1
             dxdy_max = max(dxdy_max, dxdys(i, j))
          END DO
       END DO

       IF (abs(grossismx-1.)<0.1 .OR. abs(grossismy-1.)<0.1) THEN
          PRINT *, 'ATTENTION modele peu zoome'
          PRINT *, 'ATTENTION on prend une constante de guidage cste'
          gamma = 0.
       ELSE
          gamma = (dxdy_max-2.*dxdy_min)/(dxdy_max-dxdy_min)
          PRINT *, 'gamma=', gamma
          IF (gamma<1.E-5) THEN
             PRINT *, 'gamma =', gamma, '<1e-5'
             STOP
          END IF
          PRINT *, 'gamma=', gamma
          gamma = log(0.5)/log(gamma)
       END IF
    END IF

    alphamin = factt/taumax
    alphamax = factt/taumin

    DO j = 1, pjm
       DO i = 1, pim
          IF (type==1) THEN
             dxdy_ = dxdys(i, j)
             zlat = rlatu(j)*180./pi
          ELSE IF (type==2) THEN
             dxdy_ = dxdyu(i, j)
             zlat = rlatu(j)*180./pi
          ELSE IF (type==3) THEN
             dxdy_ = dxdyv(i, j)
             zlat = rlatv(j)*180./pi
          END IF
          IF (abs(grossismx-1.)<0.1 .OR. abs(grossismy-1.)<0.1) THEN
             !  pour une grille reguliere, xi=xxx**0=1 -> alpha=alphamin
             alpha(i, j) = alphamin
          ELSE
             xi = ((dxdy_max-dxdy_)/(dxdy_max-dxdy_min))**gamma
             xi = min(xi, 1.)
             IF (lat_min_guide<=zlat .AND. zlat<=lat_max_guide) THEN
                alpha(i, j) = xi*alphamin + (1.-xi)*alphamax
             ELSE
                alpha(i, j) = 0.
             END IF
          END IF
       END DO
    END DO

  END SUBROUTINE tau2alpha

end module tau2alpha_m
1	module tau2alpha_m
2
3	IMPLICIT NONE
4
5	REAL lat_min_guide, lat_max_guide
6
7	contains
8
9	SUBROUTINE tau2alpha(type, pim, pjm, factt, taumin, taumax, alpha)
10
11	USE dimens_m, ONLY : iim, jjm
12	USE paramet_m, ONLY : iip1, jjp1
13	USE nr_util, ONLY : pi
14	USE comgeom, ONLY : cu_2d, cv_2d, rlatu, rlatv
15	USE serre, ONLY : clat, clon, grossismx, grossismy
16
17	! arguments :
18	INTEGER type
19	INTEGER pim, pjm
20	REAL factt, taumin, taumax
21	REAL dxdy_, alpha(pim, pjm)
22	REAL dxdy_min, dxdy_max
23
24	! local :
25	REAL alphamin, alphamax, gamma, xi
26	SAVE gamma
27	INTEGER i, j, ilon, ilat
28
29	LOGICAL first
30	SAVE first
31	DATA first/ .TRUE./
32
33	REAL zdx(iip1, jjp1), zdy(iip1, jjp1)
34
35	REAL zlat
36	REAL dxdys(iip1, jjp1), dxdyu(iip1, jjp1), dxdyv(iip1, jjm)
37	COMMON /comdxdy/dxdys, dxdyu, dxdyv
38
39	IF (first) THEN
40	DO j = 2, jjm
41	DO i = 2, iip1
42	zdx(i, j) = 0.5*(cu_2d(i-1, j)+cu_2d(i, j))/cos(rlatu(j))
43	END DO
44	zdx(1, j) = zdx(iip1, j)
45	END DO
46	DO j = 2, jjm
47	DO i = 1, iip1
48	zdy(i, j) = 0.5*(cv_2d(i, j-1)+cv_2d(i, j))
49	END DO
50	END DO
51	DO i = 1, iip1
52	zdx(i, 1) = zdx(i, 2)
53	zdx(i, jjp1) = zdx(i, jjm)
54	zdy(i, 1) = zdy(i, 2)
55	zdy(i, jjp1) = zdy(i, jjm)
56	END DO
57	DO j = 1, jjp1
58	DO i = 1, iip1
59	dxdys(i, j) = sqrt(zdx(i, j)zdx(i, j)+zdy(i, j)zdy(i, j))
60	END DO
61	END DO
62	DO j = 1, jjp1
63	DO i = 1, iim
64	dxdyu(i, j) = 0.5*(dxdys(i, j)+dxdys(i+1, j))
65	END DO
66	dxdyu(iip1, j) = dxdyu(1, j)
67	END DO
68	DO j = 1, jjm
69	DO i = 1, iip1
70	dxdyv(i, j) = 0.5*(dxdys(i, j)+dxdys(i+1, j))
71	END DO
72	END DO
73
74	CALL dump2d(iip1, jjp1, dxdys, 'DX2DY2 SCAL ')
75	CALL dump2d(iip1, jjp1, dxdyu, 'DX2DY2 U ')
76	CALL dump2d(iip1, jjp1, dxdyv, 'DX2DY2 v ')
77
78	! coordonnees du centre du zoom
79	CALL coordij(clon, clat, ilon, ilat)
80	! aire de la maille au centre du zoom
81	dxdy_min = dxdys(ilon, ilat)
82	! dxdy maximale de la maille
83	dxdy_max = 0.
84	DO j = 1, jjp1
85	DO i = 1, iip1
86	dxdy_max = max(dxdy_max, dxdys(i, j))
87	END DO
88	END DO
89
90	IF (abs(grossismx-1.)<0.1 .OR. abs(grossismy-1.)<0.1) THEN
91	PRINT *, 'ATTENTION modele peu zoome'
92	PRINT *, 'ATTENTION on prend une constante de guidage cste'
93	gamma = 0.
94	ELSE
95	gamma = (dxdy_max-2.*dxdy_min)/(dxdy_max-dxdy_min)
96	PRINT *, 'gamma=', gamma
97	IF (gamma<1.E-5) THEN
98	PRINT *, 'gamma =', gamma, '<1e-5'
99	STOP
100	END IF
101	PRINT *, 'gamma=', gamma
102	gamma = log(0.5)/log(gamma)
103	END IF
104	END IF
105
106	alphamin = factt/taumax
107	alphamax = factt/taumin
108
109	DO j = 1, pjm
110	DO i = 1, pim
111	IF (type==1) THEN
112	dxdy_ = dxdys(i, j)
113	zlat = rlatu(j)*180./pi
114	ELSE IF (type==2) THEN
115	dxdy_ = dxdyu(i, j)
116	zlat = rlatu(j)*180./pi
117	ELSE IF (type==3) THEN
118	dxdy_ = dxdyv(i, j)
119	zlat = rlatv(j)*180./pi
120	END IF
121	IF (abs(grossismx-1.)<0.1 .OR. abs(grossismy-1.)<0.1) THEN
122	! pour une grille reguliere, xi=xxx**0=1 -> alpha=alphamin
123	alpha(i, j) = alphamin
124	ELSE
125	xi = ((dxdy_max-dxdy_)/(dxdy_max-dxdy_min))**gamma
126	xi = min(xi, 1.)
127	IF (lat_min_guide<=zlat .AND. zlat<=lat_max_guide) THEN
128	alpha(i, j) = xialphamin + (1.-xi)alphamax
129	ELSE
130	alpha(i, j) = 0.
131	END IF
132	END IF
133	END DO
134	END DO
135
136	END SUBROUTINE tau2alpha
137
138	end module tau2alpha_m