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r.topmodel(1grass) Grass User's Manual r.topmodel(1grass)

NAME

r.topmodel - Simulates TOPMODEL which is a physically based hydrologic model.

KEYWORDS

raster, hydrology, model

SYNOPSIS

r.topmodel
r.topmodel --help
r.topmodel [-p] parameters=name topidxstats=name input=name output=name [timestep=integer] [topidxclass=integer] [topidx=name] [ntopidxclasses=integer] [outtopidxstats=name] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:

-p

Preprocess only and stop after generating outtopidxstats
--overwrite

Allow output files to overwrite existing files
--help

Print usage summary
--verbose

Verbose module output
--quiet

Quiet module output
--ui

Force launching GUI dialog

Parameters:

parameters=name [required]

Name of input TOPMODEL parameters file
topidxstats=name [required]

Name of input topographic index statistics file
input=name [required]

Name of input rainfall and potential evapotranspiration data file
output=name [required]

Name for output file
timestep=integer

Time step
Generate output for this time step
topidxclass=integer

Topographic index class
Generate output for this topographic index class
topidx=name

Name of input topographic index raster map
Must be clipped to the catchment boundary. Used for generating outtopidxstats
ntopidxclasses=integer

Number of topographic index classes
Used for generating outtopidxstats
Default: 30
outtopidxstats=name

Name for output topographic index statistics file
Requires topidx and ntopidxclasses

DESCRIPTION

r.topmodel simulates TOPMODEL which is a physically based hydrologic model.

Parameters description

parameters

This file contains TOPMODEL parameters that describe the study area. Any lines starting with a # sign or empty lines are ignored. 

# Subcatchment name
Subcatchment 1
################################################################################
# A [m^2]: Total subcatchment area
3.31697E+07
################################################################################
# qs0 [m/h]: Initial subsurface flow per unit area
#		"The first streamflow input is assumed to represent
#		 only the subsurface flow contribution in the watershed."
#								- Liaw (1988)
0.000075
# lnTe [ln(m^2/h)]: Areal average of the soil surface transmissivity
4.
# m [m]: Scaling parameter
0.0125
# Sr0 [m]: Initial root zone storage deficit
0.0025
# Srmax [m]: Maximum root zone storage deficit
0.041
# td [h]: Unsaturated zone time delay per unit storage deficit if greater than 0
#  OR
# -alpha: Effective vertical hydraulic gradient if not greater than 0.
#
# For example, -10 means alpha=10.
60.
# vch [m/h]: Main channel routing velocity
20000.
# vr [m/h]: Internal subcatchment routing velocity
10000.
################################################################################
# infex: Calculate infiltration excess if not zero (integer)
0
# K0 [m/h]: Surface hydraulic conductivity
2.
# psi [m]: Wetting front suction
0.1
# dtheta: Water content change across the wetting front
0.1
################################################################################
# d [m]: Distance from the catchment outlet
#		The first value should be the mainstream distance from
#		the subcatchment outlet to the catchment outlet.
# Ad_r:  Cumulative area ratio of subcatchment (0.0 to 1.0)
#		The first and last values should be 0 and 1, respectively.
#   d  Ad_r
    0   0.0
 1000   0.2
 2000   0.4
 3000   0.6
 4000   0.8
 5000   1.0
input

This file contains observed weather data. 

# dt [h]: Time step
24
################################################################################
# R [m/dt]:  Rainfall
# Ep [m/dt]: Potential evapotranspiration
# R             Ep
0.000033        0.000000
0.000053        0.011938
0.004821        0.000000
.
.
.
timestep

If a time step is specified, output will be generated for the specific time step in addition to the summary and total flows at the outlet. This parameter can be combined with topidxclass to specify a time step and topographic index class at the same time. If no topidxclass is given, output will be generated for all the topographic index classes.
toptopidxclass

If a topographic index class is specified, output will be generated for the given topographic index class. This parameter can be combined with timestep. If no timestep is given, output will be generated for all the time steps.
topidx, ntoptopidxclasses, outtoptopidxstats

The topidx map can optionally be used for creating a new topographic index statistics file. This map has to be already clipped to the catchment boundary. The entire range of topographic index values will be divided into ntoptopidxclasses and the area ratio of each class will be reported in the outtoptopidxstats file. These three parameters can be omitted unless a new topidxstats file needs to be created.

REFERENCES

  • Cho, H., 2000. GIS Hydrological Modeling System by Using Programming Interface of GRASS. Master’s Thesis, Department of Civil Engineering, Kyungpook National University, Korea.
  • Beven K., R. Lamb, P. Quinn, R. Romanowicz, and J. Freer, 1995. TOPMODEL, in V.P. Singh (Ed.). Computer Models of Watershed Hydrology. Water Resources Publications.
  • Liaw, S.C., 1988. Streamflow Simulation Using a Physically Based Hydrologic Model in Humid Forested Watersheds. Dissertation, Colorado State University, CO. p163.

SEE ALSO

r.fill.dir, r.mapcalc, r.topidx
How to run r.topmodel

AUTHORS

Huidae Cho, Hydro Laboratory, Kyungpook National University, South Korea

Based on TMOD9502.FOR by Keith Beven.

Last changed: $Date: 2016-06-30 11:31:29 +0200 (Thu, 30 Jun 2016) $

SOURCE CODE

Available at: r.topmodel source code (history)

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© 2003-2016 GRASS Development Team, GRASS GIS 7.2.0 Reference Manual

GRASS 7.2.0