Equations in drainage1
Variable h : Height array
h = [height]
Where:
[height]=cell/height
Comments:
Outside the cell submodel to provide an array of heights the elements of which are addressable from inside /cell and "/cell/neighbours and self" . (Inside a submodel only values for the current instance is accessible.)
Equations in cell
Variable col
col = index(1)-(row-1)*3
Variable flow direction : Bearing from north to lower neighbour (degrees)
flow direction = if nid_min==1 then 225 elseif nid_min==2 then 180 elseif nid_min==3 then 135 elseif nid_min==4 then 270 elseif nid_min==6 then 90 elseif nid_min==7 then 315 elseif nid_min==8 then 0 elseif nid_min==9 then 45 else-1
Comments:
-1 if no lower neighbour
Variable id
id = index(1)
Variable nid_min : Neighbour ID of the lowest neighbour
nid_min = posleast([h])
Where:
[h]=neighbours and self/h
Comments:
If there is no lower neighbour the value will be the the Neighbour ID of itself, i.e. 5. The Neighbour ID is the index of the "neighbours and self" submodel instances.
Variable row
row = int((index(1)-1)/3)+1
Equations in neighbours and self
Variable col : Column of the cells neighbour's and itself
col = col+element([-1,0,1,-1,0,1,-1,0,1],index(1))
Where:
col=../col
Comments:
If the cell is at the edge of the grid some of the "neighbours" will be outside the grid.
Variable h : Height of the cell's neighbours and itself
h = if col>=1 and col<=3 and row>=1 and row<=3 then element([h],nid)else 1.0E+300
Where:
[h]=../../h
Comments:
Height is assigned the value 1.0E+300 if the "neighbours" will be outside the grid.
Variable nid : ID of the cell's neighbours and itself
nid = 3*(row-1)+col
Comments:
If the cell is at the edge of the grid some of the "neighbours" will be outside the grid
Variable row : Row of the cells neighbour's and itself
row = row+element([-1,-1,-1,0,0,0,1,1,1],index(1))
Where:
row=../row
Comments:
If the cell is at the edge of the grid some of the "neighbours" will be outside the grid.
