Diffusive Hillslope Evolution (ADI)

Author: O.Conrad (c) 2013
Menu: Simulation | Hillslope Evolution

Description

Simulation of diffusive hillslope evolution using an Alternating-Direction-Implicit (ADI) method.

This tool implements suggested code examples from the text book Quantitative Modeling of Earth Surface Processes (Pelletier 2008) and serves as demonstration on code adaptions for the SAGA API. Note that this tool may be of limited use for operational purposes!

References

Pelletier, J.D. (2008): Quantitative Modeling of Earth Surface Processes. Cambridge, 295p. doi:10.1017/CBO9780511813849.

Parameters

	Name	Type	Identifier	Description	Constraints
Input	Elevation	grid, input	`DEM`	-	-
Input	Channel Mask	grid, input, optional	`CHANNELS`	use a zero value for hillslopes, any other value for channel cells.	-
Output	Modelled Elevation	grid, output	`MODEL`	-	-
Output	Elevation Difference	grid, output, optional	`DIFF`	-	-
Options	Grid System	grid system	`PARAMETERS_GRID_SYSTEM`	-	-
	Update	boolean	`UPDATE`	-	Default: 1
	Diffusivity [m2 / kyr]	floating point number	`KAPPA`	-	Minimum: 0.000000 Default: 10.000000
	Simulation Time [kyr]	floating point number	`DURATION`	-	Minimum: 0.000000 Default: 10000.000000
	Time Step	choice	`TIMESTEP`	-	Available Choices: [0] user defined [1] automatically Default: 0
	Time Step [kyr]	floating point number	`DTIME`	-	Minimum: 0.000000 Default: 1000.000000

Command Line


Usage: saga_cmd sim_qm_of_esp 4 [-DEM ] [-CHANNELS ] [-MODEL ] [-DIFF ] [-UPDATE ] [-KAPPA ] [-DURATION ] [-TIMESTEP ] [-DTIME ]
  -DEM:        	Elevation
	grid, input
  -CHANNELS:   	Channel Mask
	grid, input, optional
  -MODEL:      	Modelled Elevation
	grid, output
  -DIFF:       	Elevation Difference
	grid, output, optional
  -UPDATE:     	Update
	boolean
	Default: 1
  -KAPPA:   	Diffusivity [m2 / kyr]
	floating point number
	Minimum: 0.000000
	Default: 10.000000
  -DURATION:	Simulation Time [kyr]
	floating point number
	Minimum: 0.000000
	Default: 10000.000000
  -TIMESTEP:   	Time Step
	choice
	Available Choices:
	[0] user defined
	[1] automatically
	Default: 0
  -DTIME:   	Time Step [kyr]
	floating point number
	Minimum: 0.000000
	Default: 1000.000000