trunk/dyn3d/tau2alpha.f

module tau2alpha_m

  IMPLICIT NONE

contains

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

    USE comgeom, ONLY : cu_2d, cv_2d, rlatu, rlatv
    USE dimens_m, ONLY : jjm
    use conf_guide_m, only: lat_min_guide, lat_max_guide
    USE dimens_m, ONLY : iim
    USE nr_util, ONLY : pi
    USE paramet_m, ONLY : iip1, jjp1
    USE serre, ONLY : clat, clon, grossismx, grossismy
    use writefield_m, only: writefield

    INTEGER, intent(in):: type
    REAL, intent(in):: factt, taumin, taumax
    real, intent(out):: alpha(:, :)

    ! Local:
    REAL dxdy
    REAL dxdy_min, dxdy_max
    REAL alphamin, alphamax, xi
    REAL, SAVE:: gamma
    INTEGER i, j, ilon, ilat
    LOGICAL:: first = .TRUE.
    REAL zdx(iip1, jjp1), zdy(iip1, jjp1)
    REAL zlat
    REAL dxdys(iip1, jjp1), dxdyu(iip1, jjp1), dxdyv(iip1, jjm)

    !------------------------------------------------------------

    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)**2 + zdy(i, j)**2)
          END DO
       END DO
       CALL writefield("dxdys", dxdys)

       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, j + 1))
          END DO
       END DO

       ! 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 maximal 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
       first = .false.
    END IF

    alphamin = factt / taumax
    alphamax = factt / taumin

    DO j = 1, size(alpha, 2)
       DO i = 1, size(alpha, 1)
          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	contains
6
7	SUBROUTINE tau2alpha(type, factt, taumin, taumax, alpha)
8
9	USE comgeom, ONLY : cu_2d, cv_2d, rlatu, rlatv
10	USE dimens_m, ONLY : jjm
11	use conf_guide_m, only: lat_min_guide, lat_max_guide
12	USE dimens_m, ONLY : iim
13	USE nr_util, ONLY : pi
14	USE paramet_m, ONLY : iip1, jjp1
15	USE serre, ONLY : clat, clon, grossismx, grossismy
16	use writefield_m, only: writefield
17
18	INTEGER, intent(in):: type
19	REAL, intent(in):: factt, taumin, taumax
20	real, intent(out):: alpha(:, :)
21
22	! Local:
23	REAL dxdy
24	REAL dxdy_min, dxdy_max
25	REAL alphamin, alphamax, xi
26	REAL, SAVE:: gamma
27	INTEGER i, j, ilon, ilat
28	LOGICAL:: first = .TRUE.
29	REAL zdx(iip1, jjp1), zdy(iip1, jjp1)
30	REAL zlat
31	REAL dxdys(iip1, jjp1), dxdyu(iip1, jjp1), dxdyv(iip1, jjm)
32
33	!------------------------------------------------------------
34
35	IF (first) THEN
36	DO j = 2, jjm
37	DO i = 2, iip1
38	zdx(i, j) = 0.5 * (cu_2d(i - 1, j) + cu_2d(i, j)) / cos(rlatu(j))
39	END DO
40	zdx(1, j) = zdx(iip1, j)
41	END DO
42	DO j = 2, jjm
43	DO i = 1, iip1
44	zdy(i, j) = 0.5 * (cv_2d(i, j - 1) + cv_2d(i, j))
45	END DO
46	END DO
47	DO i = 1, iip1
48	zdx(i, 1) = zdx(i, 2)
49	zdx(i, jjp1) = zdx(i, jjm)
50	zdy(i, 1) = zdy(i, 2)
51	zdy(i, jjp1) = zdy(i, jjm)
52	END DO
53
54	DO j = 1, jjp1
55	DO i = 1, iip1
56	dxdys(i, j) = sqrt(zdx(i, j)2 + zdy(i, j)2)
57	END DO
58	END DO
59	CALL writefield("dxdys", dxdys)
60
61	DO j = 1, jjp1
62	DO i = 1, iim
63	dxdyu(i, j) = 0.5 * (dxdys(i, j) + dxdys(i + 1, j))
64	END DO
65	dxdyu(iip1, j) = dxdyu(1, j)
66	END DO
67	DO j = 1, jjm
68	DO i = 1, iip1
69	dxdyv(i, j) = 0.5 * (dxdys(i, j) + dxdys(i, j + 1))
70	END DO
71	END DO
72
73	! coordonnees du centre du zoom
74	CALL coordij(clon, clat, ilon, ilat)
75	! aire de la maille au centre du zoom
76	dxdy_min = dxdys(ilon, ilat)
77
78	! dxdy maximal de la maille :
79	dxdy_max = 0.
80	DO j = 1, jjp1
81	DO i = 1, iip1
82	dxdy_max = max(dxdy_max, dxdys(i, j))
83	END DO
84	END DO
85
86	IF (abs(grossismx - 1.)<0.1 .OR. abs(grossismy - 1.)<0.1) THEN
87	PRINT *, 'ATTENTION modele peu zoome'
88	PRINT *, 'ATTENTION on prend une constante de guidage cste'
89	gamma = 0.
90	ELSE
91	gamma = (dxdy_max - 2. * dxdy_min) / (dxdy_max - dxdy_min)
92	PRINT *, 'gamma=', gamma
93	IF (gamma<1.E-5) THEN
94	PRINT *, 'gamma =', gamma, '<1e-5'
95	STOP
96	END IF
97	PRINT *, 'gamma=', gamma
98	gamma = log(0.5) / log(gamma)
99	END IF
100	first = .false.
101	END IF
102
103	alphamin = factt / taumax
104	alphamax = factt / taumin
105
106	DO j = 1, size(alpha, 2)
107	DO i = 1, size(alpha, 1)
108	IF (type==1) THEN
109	dxdy = dxdys(i, j)
110	zlat = rlatu(j) * 180. / pi
111	ELSE IF (type==2) THEN
112	dxdy = dxdyu(i, j)
113	zlat = rlatu(j) * 180. / pi
114	ELSE IF (type==3) THEN
115	dxdy = dxdyv(i, j)
116	zlat = rlatv(j) * 180. / pi
117	END IF
118	IF (abs(grossismx - 1.)<0.1 .OR. abs(grossismy - 1.)<0.1) THEN
119	! pour une grille reguliere, xi=xxx**0=1 -> alpha=alphamin
120	alpha(i, j) = alphamin
121	ELSE
122	xi = ((dxdy_max - dxdy) / (dxdy_max - dxdy_min))**gamma
123	xi = min(xi, 1.)
124	IF (lat_min_guide <= zlat .AND. zlat <= lat_max_guide) THEN
125	alpha(i, j) = xi * alphamin + (1. - xi) * alphamax
126	ELSE
127	alpha(i, j) = 0.
128	END IF
129	END IF
130	END DO
131	END DO
132
133	END SUBROUTINE tau2alpha
134
135	end module tau2alpha_m