Stream Power Index
| Author(s) | O.Conrad (c) 2003 |
| Library ID | ta_hydrology |
| Tool ID | 21 |
| Version | 1.0 |
| 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. doi:10.1002/hyp.3360050103
Parameters
| | Name | Type | Identifier | Description | Constraints |
|---|
| Input | Slope | grid, input | SLOPE | - | - |
| Catchment Area | grid, input | AREA | - | - |
| Output | Stream Power Index | grid, output | SPI | - | - |
| Options | Grid System | grid system | PARAMETERS_GRID_SYSTEM | - | - |
| 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