slow
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MountainFlow, the runoff module of MountainHydro, uses the
synthetic drainage network to route the surface water down to the
watershed outlet. This network is drawn over the edges of cells forming
the watershed and appears in magenta in the figure. The surface water
runs in channels whose dimensions
are determined after a modified drained area calculation that takes
into
account the surface convergence power of each cell, thus including the
microtopography effect on the concentration of surface water. The
channels are also fed partly by macropores from nearby soil cells
and partly by the saturated/unsaturated soil matrix flow where slope
inversions occur.
Here is a short simulation sample showing the non-matrix
water (the dominant component of fast flow) versus time
using a rainbow color scale shown at the left of the figure.
Each color represents a certain amount of non-matrix water :
- dark blue : 20 mm or more
- green : about 10 mm
- light pink : less than 2mm
Rain, simulated runoff (black) and observed runoff (red) are
shown on
the right side of the figure
Observe the expansion and contraction of the drainage network.
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