IMPORTANT: Problem with multiple telescoping nested grids

[arango]

There seems to be a problem when setting the time-stepping in multiple (more than one) telescoping grids. Recall that technically inside ROMS, a telescoping grid is a refined grid with RefineScale > 0 including another finer refined grid inside. For more information about telescoping grids check the ​following information in the forum.

The variable RefineStepsCounter in ntimestep.F need to be set to zero every time that the parent coarser grid steps for all of telescoped finer resolution children grids:

              ...
            ELSE IF (RefinedGrid(ng).and.(RefineScale(ng).gt.0)) THEN
              IF (step_counter(ng).le.(WindowSteps(ig)+1)) THEN
                IF (Telescoping(ng)) THEN
                  my_Nsteps(ig)=1
                  step_counter(ng)=step_counter(ng)+1
                  RefineStepsCounter(ng)=RefineStepsCounter(ng)+1
                  DO il=nl+1,NestLayers         ! When a parent steps,
                    gn=GridNumber(ig,il)        ! set all its telescoped
                    IF (Telescoping(gn)) THEN   ! children counters to
                      RefineStepsCounter(gn)=0  ! zero
                    END IF
                  END DO
                ELSE
                  my_Nsteps(ig)=RefineSteps(ng)
                  step_counter(ng)=step_counter(ng)+RefineSteps(ng)
                  RefineStepsCounter(ng)=RefineStepsCounter(ng)+        &
     &                                   RefineSteps(ng)
                END IF
              ELSE
                ...

Many thanks to John Warner for correcting this problem.