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module inter_barx_m |
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implicit none |
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contains |
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function inter_barx(dlonid, fdat, rlonimod) |
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! From dyn3d/inter_barx.F, version 1.1.1.1, 2004/05/19 12:53:06 |
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! Authors: Robert Sadourny, P. Le Van |
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! INTERPOLATION BARYCENTRIQUE BASEE SUR LES AIRES |
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! VERSION UNIDIMENSIONNELLE, EN LONGITUDE . |
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|
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use nr_util, only: assert_eq, pi |
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|
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REAL, intent(in):: dlonid(:) ! (idatmax) |
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! abscisses des interfaces des mailles donnees |
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|
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real, intent(in):: fdat(:) ! (idatmax) champ de donnees |
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|
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real, intent(in):: rlonimod(:) ! (imodmax) |
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! Abscisses des interfaces des mailles modele. L'indice 1 |
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! correspond a l'interface mailLE 1 / maille 2. Les abscisses sont |
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! exprim\'ees en degres. |
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|
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real inter_barx(size(rlonimod)) ! champ du modele |
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|
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! Local: |
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INTEGER idatmax, imodmax |
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REAL xxid(size(dlonid)+1), xxd(size(dlonid)+1), fdd(size(dlonid)+1) |
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REAL fxd(size(dlonid)+1), xchan(size(dlonid)+1), fdchan(size(dlonid)+1) |
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REAL xxim(size(rlonimod)) |
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REAL x0, xim0, dx, dxm |
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REAL chmax |
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integer idat ! indice du champ de donnees, de 1 a idatmax |
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INTEGER imod ! indice du champ du modele, de 1 a imodmax |
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integer i, ichang, id0, id1, nid, idatmax1 |
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|
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!----------------------------------------------------- |
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|
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idatmax = assert_eq(size(dlonid), size(fdat), "inter_barx idatmax") |
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imodmax = size(rlonimod) |
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|
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! REDEFINITION DE L'ORIGINE DES ABSCISSES |
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! A L'INTERFACE OUEST DE LA PREMIERE MAILLE DU MODELE |
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DO imod = 1, imodmax |
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xxim(imod) = rlonimod(imod) |
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ENDDO |
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|
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chmax = maxval(xxim) |
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IF(chmax < 6.50) THEN |
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DO imod = 1, imodmax |
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xxim(imod) = xxim(imod) * 180./pi |
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ENDDO |
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ENDIF |
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|
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xim0 = xxim(imodmax) - 360. |
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|
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DO imod = 1, imodmax |
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xxim(imod) = xxim(imod) - xim0 |
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ENDDO |
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|
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idatmax1 = idatmax +1 |
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|
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DO idat = 1, idatmax |
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xxd(idat) = dlonid(idat) |
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ENDDO |
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|
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chmax = maxval(xxd(:idatmax)) |
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IF(chmax < 6.50) THEN |
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DO idat = 1, idatmax |
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xxd(idat) = xxd(idat) * 180./pi |
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ENDDO |
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ENDIF |
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|
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DO idat = 1, idatmax |
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xxd(idat) = AMOD(xxd(idat) - xim0, 360.) |
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fdd(idat) = fdat (idat) |
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ENDDO |
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|
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i = 2 |
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DO while (xxd(i) >= xxd(i-1) .and. i < idatmax) |
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i = i + 1 |
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ENDDO |
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IF (xxd(i) < xxd(i-1)) THEN |
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ichang = i |
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! *** reorganisation des longitudes entre 0. et 360. degres **** |
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nid = idatmax - ichang +1 |
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DO i = 1, nid |
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xchan (i) = xxd(i+ichang -1) |
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fdchan(i) = fdd(i+ichang -1) |
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ENDDO |
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DO i=1, ichang -1 |
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xchan (i+ nid) = xxd(i) |
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fdchan(i+nid) = fdd(i) |
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ENDDO |
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DO i =1, idatmax |
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xxd(i) = xchan(i) |
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fdd(i) = fdchan(i) |
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ENDDO |
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end IF |
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|
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! translation des champs de donnees par rapport |
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! a la nouvelle origine, avec redondance de la |
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! maille a cheval sur les bords |
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id0 = 0 |
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id1 = 0 |
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DO idat = 1, idatmax |
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IF (xxd(idatmax1- idat) < 360.) exit |
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id1 = id1 + 1 |
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ENDDO |
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|
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DO idat = 1, idatmax |
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IF (xxd(idat) > 0.) exit |
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id0 = id0 + 1 |
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END DO |
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|
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IF(id1 /= 0) then |
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DO idat = 1, id1 |
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xxid(idat) = xxd(idatmax - id1 + idat) - 360. |
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fxd (idat) = fdd(idatmax - id1 + idat) |
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END DO |
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DO idat = 1, idatmax - id1 |
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xxid(idat + id1) = xxd(idat) |
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fxd (idat + id1) = fdd(idat) |
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END DO |
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end IF |
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|
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IF(id0 /= 0) then |
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DO idat = 1, idatmax - id0 |
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xxid(idat) = xxd(idat + id0) |
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fxd (idat) = fdd(idat + id0) |
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END DO |
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DO idat = 1, id0 |
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xxid (idatmax - id0 + idat) = xxd(idat) + 360. |
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fxd (idatmax - id0 + idat) = fdd(idat) |
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END DO |
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else |
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DO idat = 1, idatmax |
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xxid(idat) = xxd(idat) |
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fxd (idat) = fdd(idat) |
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ENDDO |
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end IF |
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xxid(idatmax1) = xxid(1) + 360. |
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fxd (idatmax1) = fxd(1) |
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! initialisation du champ du modele |
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inter_barx(:) = 0. |
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! iteration |
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x0 = xim0 |
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dxm = 0. |
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imod = 1 |
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idat = 1 |
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|
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do while (imod <= imodmax) |
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do while (xxim(imod) > xxid(idat)) |
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dx = xxid(idat) - x0 |
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dxm = dxm + dx |
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inter_barx(imod) = inter_barx(imod) + dx * fxd(idat) |
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x0 = xxid(idat) |
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idat = idat + 1 |
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end do |
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IF (xxim(imod) < xxid(idat)) THEN |
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dx = xxim(imod) - x0 |
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dxm = dxm + dx |
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inter_barx(imod) = (inter_barx(imod) + dx * fxd(idat)) / dxm |
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x0 = xxim(imod) |
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dxm = 0. |
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imod = imod + 1 |
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ELSE |
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dx = xxim(imod) - x0 |
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dxm = dxm + dx |
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inter_barx(imod) = (inter_barx(imod) + dx * fxd(idat)) / dxm |
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x0 = xxim(imod) |
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dxm = 0. |
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imod = imod + 1 |
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idat = idat + 1 |
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END IF |
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end do |
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|
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END function inter_barx |
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|
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end module inter_barx_m |
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