Stream Power Index

Author: O.Conrad (c) 2003
Menu: Terrain Analysis | Hydrology | Topographic Indices

Description

Calculation of stream power index based on slope and specific catchment area (SCA). SPI = SCA * tan(Slope)

References

Moore, I.D., Grayson, R.B., Ladson, A.R. (1991): Digital terrain modelling: a review of hydrogical, geomorphological, and biological applications. Hydrological Processes, Vol.5, No.1

Parameters

	Name	Type	Identifier	Description	Constraints
Input	Slope	grid, input	`SLOPE`	-	-
Input	Catchment Area	grid, input	`AREA`	-	-
Output	Stream Power Index	grid, output	`SPI`	-	-
Options	Grid System	grid system	`PARAMETERS_GRID_SYSTEM`	-	-
Options	Area Conversion	choice	`CONV`	-	Available Choices: [0] no conversion (areas already given as specific catchment area) [1] 1 / cell size (pseudo specific catchment area) Default: 0

Command Line

Usage: saga_cmd ta_hydrology 21 [-SLOPE ] [-AREA ] [-SPI ] [-CONV ]
  -SLOPE:	Slope
	grid, input
  -AREA: 	Catchment Area
	grid, input
  -SPI:  	Stream Power Index
	grid, output
  -CONV: 	Area Conversion
	choice
	Available Choices:
	[0] no conversion (areas already given as specific catchment area)
	[1] 1 / cell size (pseudo specific catchment area)
	Default: 0