dyn3d/Guide/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 conf_guide_m, only: lat_min_guide, lat_max_guide
    USE dimens_m, ONLY: iim, jjm
    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)

       if (type == 2) then
          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
       elseif (type == 3) then
          DO j = 1, jjm
             DO i = 1, iip1
                dxdyv(i, j) = 0.5 * (dxdys(i, j) + dxdys(i, j + 1))
             END DO
          END DO
       end if

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