r.topmodel(1grass) GRASS GIS 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] [ntopidx-
classes=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 out-
topidxstats
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]: Parameter controlling the decline rate of transmissivity
# See Beven and Kirkby (1979)
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 spe-
cific 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 topo-
graphic index classes.
toptopidxclass
If a topographic index class is specified, output will be generated
for the given topographic index class. This parameter can be com-
bined with timestep. If no timestep is given, output will be gener-
ated for all the time steps.
topidx, ntoptopidxclasses, outtoptopidxstats
The topidx map can optionally be used for creating a new topo-
graphic 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
• Beven, K. J., 1984. Infiltration into a class of vertically
non-uniform soils. Hydrological Sciences Journal 29 (4),
425-434.
• Beven, K. J., Kirkby, M. J., 1979. A physically based, variable
contributing area model of basin hydrology. Hydrological Sci-
ences Bulletin 24 (1), 43-69.
• Beven K. J., R. Lamb, P. Quinn, R. Romanowicz, and J. Freer,
1995. TOPMODEL, in V.P. Singh (Ed.). Computer Models of Water-
shed Hydrology. Water Resources Publications.
• Cho, H., 2000. GIS Hydrological Modeling System by Using Pro-
gramming Interface of GRASS. Master’s Thesis, Department of
Civil Engineering, Kyungpook National University, Korea.
• Liaw, S. C., 1988. Streamflow Simulation Using a Physically
Based Hydrologic Model in Humid Forested Watersheds. Disserta-
tion, Colorado State University, CO. p163.
• Morel-Seytoux, H. J., Khanji, J., 1974. Derivation of an equa-
tion of infiltration. Water Resources Research 10 (4), 795-800.
SEE ALSO
r.fill.dir, r.mapcalc, r.topidx
How to run r.topmodel
AUTHORS
Huidae Cho, Hydro Laboratory, Kyungpook National University, South Ko-
rea
Based on TMOD9502.FOR by Keith Beven.
SOURCE CODE
Available at: r.topmodel source code (history)
Accessed: unknown
Main index | Raster index | Topics index | Keywords index | Graphical
index | Full index
© 2003-2022 GRASS Development Team, GRASS GIS 7.8.7 Reference Manual
GRASS 7.8.7 r.topmodel(1grass)
Generated by dwww version 1.14 on Sun Dec 29 18:56:32 CET 2024.