Isochrones Variable Speed
| Author(s) | V.Olaya (c) 2004, V.Wichmann (c) 2015 |
| Library ID | ta_hydrology |
| Tool ID | 30 |
| Version | 1.0 |
| Menu | Terrain Analysis | Hydrology | Dynamics |
Description
Calculation of isochrones with variable speed.
In case a cell in an optional input grid is NoData, the corresponding parameter value will be used instead of skipping this cell.
This is the non-interactive tool version, where the target point can be specified either as point shapefile (the first point in the file will be used) or by target coordinates.
References
Al-Smadi, Mohammad (1998): Incorporating spatial and temporal variation of watershed response in a gis-based hydrologic model. Faculty of the Virginia Polythecnic Institute and State University. MSc Thesis. online
MartÃnez Ãlvarez, V.; Dal-Ré Tenreiro, R.; GarcÃa GarcÃa, A. I.; Ayuga Téllez, F. (n.d.): Modelación distribuida de la escorrentÃa superficial en pequeñas cuencas mediante SIG. Evaluación experimental.
Olaya, V. (2004): Hidrologia computacional y modelos digitales del terreno. Alqua. 536 pp.
Parameters
| | Name | Type | Identifier | Description | Constraints |
|---|
| Input | Elevation | grid, input | DEM | - | - |
| Slope | grid, input | SLOPE | - | - |
| Catchment Area | grid, input | FLOWACC | - | - |
| Curve Number | grid, input, optional | CN | - | - |
| Manning's N | grid, input, optional | MANNING | - | - |
| Target Point | shapes, input, optional | TARGET_PT | A point shapefile with the target point. | - |
| Output | Time Out(h) | grid, output | TIME | - | - |
| Speed (m/s) | grid, output | SPEED | - | - |
| Options | Grid System | grid system | PARAMETERS_GRID_SYSTEM | - | - |
| Avg. Manning's N | floating point number | AVGMANNING | - | Default: 0.150000 |
| Avg. Curve Number | floating point number | AVGCN | - | Default: 75.000000 |
| Mixed Flow Threshold (ha) | floating point number | THRSMIXED | - | Default: 18.000000 |
| Channel Definition Threshold (ha) | floating point number | THRSCHANNEL | - | Default: 360.000000 |
| Avg. Rainfall Intensity (mm/h) | floating point number | AVGRAINFALL | - | Default: 1.000000 |
| Channel side slope(m/m) | floating point number | CHANSLOPE | - | Default: 0.500000 |
| Min. Flow Speed (m/s) | floating point number | MINSPEED | - | Default: 0.050000 |
| Target X Coordinate | floating point number | TARGET_PT_X | The x-coordinate of the target point in world coordinates [map units] | Default: 0.000000 |
| Target Y Coordinate | floating point number | TARGET_PT_Y | The y-coordinate of the target point in world coordinates [map units] | Default: 0.000000 |
Command Line
Usage: saga_cmd ta_hydrology 30 [-DEM ] [-SLOPE ] [-FLOWACC ] [-CN ] [-MANNING ] [-TIME ] [-SPEED ] [-AVGMANNING ] [-AVGCN ] [-THRSMIXED ] [-THRSCHANNEL ] [-AVGRAINFALL ] [-CHANSLOPE ] [-MINSPEED ] [-TARGET_PT_X ] [-TARGET_PT_Y ] [-TARGET_PT ]
-DEM: Elevation
grid, input
-SLOPE: Slope
grid, input
-FLOWACC: Catchment Area
grid, input
-CN: Curve Number
grid, input, optional
-MANNING: Manning's N
grid, input, optional
-TIME: Time Out(h)
grid, output
-SPEED: Speed (m/s)
grid, output
-AVGMANNING: Avg. Manning's N
floating point number
Default: 0.150000
-AVGCN: Avg. Curve Number
floating point number
Default: 75.000000
-THRSMIXED: Mixed Flow Threshold (ha)
floating point number
Default: 18.000000
-THRSCHANNEL: Channel Definition Threshold (ha)
floating point number
Default: 360.000000
-AVGRAINFALL: Avg. Rainfall Intensity (mm/h)
floating point number
Default: 1.000000
-CHANSLOPE: Channel side slope(m/m)
floating point number
Default: 0.500000
-MINSPEED: Min. Flow Speed (m/s)
floating point number
Default: 0.050000
-TARGET_PT_X: Target X Coordinate
floating point number
Default: 0.000000
-TARGET_PT_Y: Target Y Coordinate
floating point number
Default: 0.000000
-TARGET_PT: Target Point
shapes, input, optional