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module init_tau2alpha_m |
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IMPLICIT NONE |
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REAL dxdy_min, dxdy_max, gamma |
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contains |
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SUBROUTINE init_tau2alpha(dxdys) |
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USE comgeom, ONLY: cu_2d, cv_2d |
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use coordij_m, only: coordij |
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USE dimensions, ONLY: jjm |
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USE dynetat0_m, ONLY: rlatu |
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USE dynetat0_chosen_m, ONLY: clat, clon, grossismx, grossismy |
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USE paramet_m, ONLY: iip1, jjp1 |
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use writefield_m, only: writefield |
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REAL, intent(out):: dxdys(iip1, jjp1) |
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! Local: |
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INTEGER i, j, ilon, ilat |
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REAL dx(iip1, jjp1), dy(iip1, jjp1) |
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!------------------------------------------------------------ |
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PRINT *, 'Call sequence information: init_tau2alpha' |
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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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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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! 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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print *, "dxdy_min = ", dxdy_min |
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! dxdy maximal de la maille : |
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dxdy_max = maxval(dxdys) |
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print *, "dxdy_max = ", dxdy_max |
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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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END SUBROUTINE init_tau2alpha |
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end module init_tau2alpha_m |
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