dyn3d/Guide/tau2alpha.f

module tau2alpha_m

    USE paramet_m, ONLY : iip1, jjp1
    USE dimens_m, ONLY : jjm

    IMPLICIT NONE

    private iip1, jjp1, jjm

    REAL lat_min_guide, lat_max_guide
    REAL dxdys(iip1, jjp1), dxdyu(iip1, jjp1), dxdyv(iip1, jjm)

contains

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

    USE dimens_m, ONLY : iim
    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, intent(in):: 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

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

    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	USE paramet_m, ONLY : iip1, jjp1
4	USE dimens_m, ONLY : jjm
5
6	IMPLICIT NONE
7
8	private iip1, jjp1, jjm
9
10	REAL lat_min_guide, lat_max_guide
11	REAL dxdys(iip1, jjp1), dxdyu(iip1, jjp1), dxdyv(iip1, jjm)
12
13	contains
14
15	SUBROUTINE tau2alpha(type, pim, pjm, factt, taumin, taumax, alpha)
16
17	USE dimens_m, ONLY : iim
18	USE nr_util, ONLY : pi
19	USE comgeom, ONLY : cu_2d, cv_2d, rlatu, rlatv
20	USE serre, ONLY : clat, clon, grossismx, grossismy
21
22	! arguments :
23	INTEGER type
24	INTEGER pim, pjm
25	REAL, intent(in):: factt, taumin, taumax
26	REAL dxdy_, alpha(pim, pjm)
27	REAL dxdy_min, dxdy_max
28
29	! local :
30	REAL alphamin, alphamax, gamma, xi
31	SAVE gamma
32	INTEGER i, j, ilon, ilat
33
34	LOGICAL first
35	SAVE first
36	DATA first/ .TRUE./
37
38	REAL zdx(iip1, jjp1), zdy(iip1, jjp1)
39	REAL zlat
40
41	!------------------------------------------------------------
42
43	IF (first) THEN
44	DO j = 2, jjm
45	DO i = 2, iip1
46	zdx(i, j) = 0.5*(cu_2d(i-1, j)+cu_2d(i, j))/cos(rlatu(j))
47	END DO
48	zdx(1, j) = zdx(iip1, j)
49	END DO
50	DO j = 2, jjm
51	DO i = 1, iip1
52	zdy(i, j) = 0.5*(cv_2d(i, j-1)+cv_2d(i, j))
53	END DO
54	END DO
55	DO i = 1, iip1
56	zdx(i, 1) = zdx(i, 2)
57	zdx(i, jjp1) = zdx(i, jjm)
58	zdy(i, 1) = zdy(i, 2)
59	zdy(i, jjp1) = zdy(i, jjm)
60	END DO
61	DO j = 1, jjp1
62	DO i = 1, iip1
63	dxdys(i, j) = sqrt(zdx(i, j)zdx(i, j)+zdy(i, j)zdy(i, j))
64	END DO
65	END DO
66	DO j = 1, jjp1
67	DO i = 1, iim
68	dxdyu(i, j) = 0.5*(dxdys(i, j)+dxdys(i+1, j))
69	END DO
70	dxdyu(iip1, j) = dxdyu(1, j)
71	END DO
72	DO j = 1, jjm
73	DO i = 1, iip1
74	dxdyv(i, j) = 0.5*(dxdys(i, j)+dxdys(i+1, j))
75	END DO
76	END DO
77
78	CALL dump2d(iip1, jjp1, dxdys, 'DX2DY2 SCAL ')
79	CALL dump2d(iip1, jjp1, dxdyu, 'DX2DY2 U ')
80	CALL dump2d(iip1, jjp1, dxdyv, 'DX2DY2 v ')
81
82	! coordonnees du centre du zoom
83	CALL coordij(clon, clat, ilon, ilat)
84	! aire de la maille au centre du zoom
85	dxdy_min = dxdys(ilon, ilat)
86	! dxdy maximale de la maille
87	dxdy_max = 0.
88	DO j = 1, jjp1
89	DO i = 1, iip1
90	dxdy_max = max(dxdy_max, dxdys(i, j))
91	END DO
92	END DO
93
94	IF (abs(grossismx-1.)<0.1 .OR. abs(grossismy-1.)<0.1) THEN
95	PRINT *, 'ATTENTION modele peu zoome'
96	PRINT *, 'ATTENTION on prend une constante de guidage cste'
97	gamma = 0.
98	ELSE
99	gamma = (dxdy_max-2.*dxdy_min)/(dxdy_max-dxdy_min)
100	PRINT *, 'gamma=', gamma
101	IF (gamma<1.E-5) THEN
102	PRINT *, 'gamma =', gamma, '<1e-5'
103	STOP
104	END IF
105	PRINT *, 'gamma=', gamma
106	gamma = log(0.5)/log(gamma)
107	END IF
108	END IF
109
110	alphamin = factt/taumax
111	alphamax = factt/taumin
112
113	DO j = 1, pjm
114	DO i = 1, pim
115	IF (type==1) THEN
116	dxdy_ = dxdys(i, j)
117	zlat = rlatu(j)*180./pi
118	ELSE IF (type==2) THEN
119	dxdy_ = dxdyu(i, j)
120	zlat = rlatu(j)*180./pi
121	ELSE IF (type==3) THEN
122	dxdy_ = dxdyv(i, j)
123	zlat = rlatv(j)*180./pi
124	END IF
125	IF (abs(grossismx-1.)<0.1 .OR. abs(grossismy-1.)<0.1) THEN
126	! pour une grille reguliere, xi=xxx**0=1 -> alpha=alphamin
127	alpha(i, j) = alphamin
128	ELSE
129	xi = ((dxdy_max-dxdy_)/(dxdy_max-dxdy_min))**gamma
130	xi = min(xi, 1.)
131	IF (lat_min_guide<=zlat .AND. zlat<=lat_max_guide) THEN
132	alpha(i, j) = xialphamin + (1.-xi)alphamax
133	ELSE
134	alpha(i, j) = 0.
135	END IF
136	END IF
137	END DO
138	END DO
139
140	END SUBROUTINE tau2alpha
141
142	end module tau2alpha_m