Hydrological Sciences
Flow calculation
- r.carve: Takes vector stream data, transforms it to raster and subtracts depth from the output DEM.
- r.drain: Traces a flow through an elevation model on a raster map.
- r.fillnulls: Fills no-data areas in raster maps using v.surf.rst splines interpolation
- r.fill.dir: Filters and generates a depressionless elevation map and a flow direction map from a given elevation layer.
- r.flow: Construction of slope curves (flowlines), flowpath lengths, and flowline densities (upslope areas) from a raster digital elevation model (DEM)
- r.topidx: Creates topographic index [ln(a/tan(beta))] map from elevation map.
- r.terraflow: Flow computation for massive grids.
Groundwater flow
- r.gwflow: Numerical calculation program for transient, confined and unconfined groundwater flow in two dimensions.
- r3.gwflow: Numerical calculation program for transient, confined groundwater flow in three dimensions.
Hydrological models
- r.topmodel: Simulates TOPMODEL which is a physically based hydrologic model.
Sediment modules
- r.sim.sediment: Sediment transport and erosion/deposition simulation using path sampling method (SIMWE)
- r.sim.water: Overland flow hydrologic simulation using path sampling method (SIMWE)
Stream modules
- r.stream.angle: Route azimuth, direction and relation to streams of higher order
- r.stream.basins: Calculate basins according user input
- r.stream.del: Calculate basins according user input
- r.stream.distance: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets
- r.stream.extract: Stream network extraction
- r.stream.order: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It use r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together
- r.stream.pos: Route azimuth, direction and relation to streams of higher order
- r.stream.stats:Calculate Horton's and optionally Hack's statistics according to user input
Watershed modules
- r.basin.fill: Generates a raster map layer showing watershed subbasins.
- r.water.outlet: Generates a watershed basin from a drainage direction map (from r.watershed) and a set of coordinates representing the outlet point of watershed.
- r.watershed: Watershed basin analysis program.
Tutorial: Creating watersheds