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module tau2alpha_m |
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|
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IMPLICIT NONE |
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|
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contains |
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|
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SUBROUTINE tau2alpha(type, factt, taumin, taumax, alpha) |
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|
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USE comgeom, ONLY: cu_2d, cv_2d, rlatu, rlatv |
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use conf_guide_m, only: lat_min_guide, lat_max_guide |
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USE dimens_m, ONLY: iim, jjm |
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USE nr_util, ONLY: pi |
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USE paramet_m, ONLY: iip1, jjp1 |
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USE serre, ONLY: clat, clon, grossismx, grossismy |
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use writefield_m, only: writefield |
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|
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INTEGER, intent(in):: type |
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REAL, intent(in):: factt, taumin, taumax |
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real, intent(out):: alpha(:, :) |
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|
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! Local: |
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REAL dxdy |
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REAL, save:: dxdy_min, dxdy_max |
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REAL alphamin, alphamax, xi |
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REAL, SAVE:: gamma |
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INTEGER i, j, ilon, ilat |
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LOGICAL:: first = .TRUE. |
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REAL dx(iip1, jjp1), dy(iip1, jjp1) |
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REAL zlat |
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REAL, save:: dxdys(iip1, jjp1), dxdyu(iip1, jjp1), dxdyv(iip1, jjm) |
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|
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!------------------------------------------------------------ |
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|
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IF (first) THEN |
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DO j = 2, jjm |
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DO i = 2, iip1 |
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dx(i, j) = 0.5 * (cu_2d(i - 1, j) + cu_2d(i, j)) / cos(rlatu(j)) |
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END DO |
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dx(1, j) = dx(iip1, j) |
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END DO |
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DO j = 2, jjm |
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DO i = 1, iip1 |
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dy(i, j) = 0.5 * (cv_2d(i, j - 1) + cv_2d(i, j)) |
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END DO |
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END DO |
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DO i = 1, iip1 |
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dx(i, 1) = dx(i, 2) |
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dx(i, jjp1) = dx(i, jjm) |
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dy(i, 1) = dy(i, 2) |
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dy(i, jjp1) = dy(i, jjm) |
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END DO |
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|
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DO j = 1, jjp1 |
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DO i = 1, iip1 |
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dxdys(i, j) = sqrt(dx(i, j)**2 + dy(i, j)**2) |
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END DO |
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END DO |
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CALL writefield("dxdys", dxdys) |
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|
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DO j = 1, jjp1 |
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DO i = 1, iim |
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dxdyu(i, j) = 0.5 * (dxdys(i, j) + dxdys(i + 1, j)) |
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END DO |
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dxdyu(iip1, j) = dxdyu(1, j) |
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END DO |
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|
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DO j = 1, jjm |
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DO i = 1, iip1 |
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dxdyv(i, j) = 0.5 * (dxdys(i, j) + dxdys(i, j + 1)) |
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END DO |
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END DO |
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|
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! coordonnees du centre du zoom |
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CALL coordij(clon, clat, ilon, ilat) |
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! aire de la maille au centre du zoom |
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dxdy_min = dxdys(ilon, ilat) |
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|
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! dxdy maximal de la maille : |
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dxdy_max = 0. |
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DO j = 1, jjp1 |
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DO i = 1, iip1 |
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dxdy_max = max(dxdy_max, dxdys(i, j)) |
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END DO |
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END DO |
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|
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IF (abs(grossismx - 1.) < 0.1 .OR. abs(grossismy - 1.) < 0.1) THEN |
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PRINT *, 'Attention : modèle peu zoomé.' |
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PRINT *, 'On prend une constante de guidage constante.' |
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ELSE |
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gamma = (dxdy_max - 2. * dxdy_min) / (dxdy_max - dxdy_min) |
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IF (gamma < 1E-5) THEN |
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PRINT *, '(dxdy_max - 2. * dxdy_min) / (dxdy_max - dxdy_min) ' & |
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// '< 1e-5' |
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STOP 1 |
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END IF |
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gamma = log(0.5) / log(gamma) |
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PRINT *, 'gamma=', gamma |
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END IF |
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first = .false. |
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END IF |
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|
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alphamin = factt / taumax |
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alphamax = factt / taumin |
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|
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DO j = 1, size(alpha, 2) |
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DO i = 1, size(alpha, 1) |
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IF (type==1) THEN |
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dxdy = dxdys(i, j) |
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zlat = rlatu(j) * 180. / pi |
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ELSE IF (type==2) THEN |
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dxdy = dxdyu(i, j) |
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zlat = rlatu(j) * 180. / pi |
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ELSE IF (type==3) THEN |
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dxdy = dxdyv(i, j) |
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zlat = rlatv(j) * 180. / pi |
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END IF |
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IF (abs(grossismx - 1.) < 0.1 .OR. abs(grossismy - 1.) < 0.1) THEN |
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! grille regulière |
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alpha(i, j) = alphamin |
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ELSE |
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xi = ((dxdy_max - dxdy) / (dxdy_max - dxdy_min))**gamma |
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xi = min(xi, 1.) |
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IF (lat_min_guide <= zlat .AND. zlat <= lat_max_guide) THEN |
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alpha(i, j) = xi * alphamin + (1. - xi) * alphamax |
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ELSE |
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alpha(i, j) = 0. |
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END IF |
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END IF |
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END DO |
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END DO |
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|
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END SUBROUTINE tau2alpha |
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|
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end module tau2alpha_m |
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