! $Header$

SUBROUTINE covnat (klevel, ucov, vcov, unat, vnat)
  IMPLICIT NONE

  !=======================================================================
  !
  !   Auteur:  F Hourdin Phu LeVan
  !   -------
  !
  !   Objet:
  !   ------
  !
  !  *********************************************************************
  !    calcul des compos. naturelles a partir des comp.covariantes
  !  ********************************************************************
  !
  !=======================================================================

 include "dimensions.h"
 include "paramet.h"
 include "comgeom.h"

  INTEGER :: klevel
  REAL :: ucov(ip1jmp1, klevel), vcov(ip1jm, klevel)
  REAL :: unat(ip1jmp1, klevel), vnat(ip1jm, klevel)
  INTEGER :: l, ij

  DO l = 1, klevel
    DO ij = 1, iip1
      unat (ij, l) = 0.
    END DO

    DO ij = iip2, ip1jm
      unat(ij, l) = ucov(ij, l) / cu(ij)
    ENDDO
    DO ij = ip1jm + 1, ip1jmp1
      unat (ij, l) = 0.
    END DO

    DO ij = 1, ip1jm
      vnat(ij, l) = vcov(ij, l) / cv(ij)
    ENDDO

  ENDDO
  RETURN
END SUBROUTINE covnat