View source for TRIM-2D

{{ProgramDescription
|name_de=TRIM-2D
|name=TRIM-2D
|version=12.x 
|version_descr=March 2003 
|catchwords=numerical simulation<br />
finite difference method<br />
two-dimensional, transient, nonlinear<br />
shallow water equations<br />
tidal dynamics<br />
advection-diffusion equation<br />
salt transport<br />
suspended sediment transport<br />
deposition and resuspension<br />
bed load transport<br />
numerical model TRIM-2D<br />
portable SMP-programming using [http://openmp.org/wp/ OpenMP]<br />
morphodynamic evolution of the bottom due to suspended load as well as bed load transport  
|shortdescription=The two-dimensional finite difference numerical model TRIM-2D can be used to simulate flow and transport processes in different free-surface flow problems.
The following list of physical processes are taken into account by TRIM-2D:

* shallow water equations
:*local acceleration (inertia)
:*advective acceleration
:*Coriolis acceleration
:*barotropic pressure gradient
:*baroclinic pressure gradient (depth integrated)
:*turbulent diffusion and dispersion
:*bottom friction
:*wind friction
:*time-varying height of control-structures (weirs)
* advection-diffusion equation
:*local rate of change of concentration
:*advctive rate of change of concentration
:*turbulent diffusion and dispersion
:*settling velocity depends on turbulence intensity
* Exchange of suspended sediments between the bottom layer and the water column
:*resuspension of deposited suspended sediments above a critical bottom shear stress (critical shear stress for resuspension)
:*deposition of suspended sediments below a critical bottom shear stress (critical shear stress for deposition)
* bed load transport of sediments
:*bed load transport rate is given by the transport capacity of the flow (vanRIJN, BAGNOLD)
* morphodynamic evolution of the bottom
:*net erosion/deposition due to bed load transport
:*net erosion/deposition due to suspended load transport

Turbulent diffusion as well as dispersion is parameterized using constant coefficients.

With the aid of the numerical model TRIM-2D the following physical quantities can be calculated:

* free surface elevation
* depth-averaged current velocity
* depth-averaged salinity
* depth-averaged suspended sediment concentration
* deposited suspended sediment mass
* bed load transport rate
* deposited bed load material mass
* bottom shear stress
* wind shear stress
* depth erosion
* time varying depth of the bottom

A comprehensive description of TRIM-2D is available in the form of a [http://www.baw.de/methoden/index.php5?title=Mathematisches_Verfahren_TRIM-2D&action=edit&redlink=1 Standard Validation Document] (in German only). 
|inputfiles=
#general input data (filetype [[TRIM2D.DAT|trim2d.dat]])
#general input data for bed load transport (filetype [[TRIM2D.BED.DAT|trim2d.bed.dat]])
#solver accuracy (filetype [[RELAX.DAT|relax.dat]])
#bathymetry and index arrays (filetype [[TR2.TOPO.BIN.IND|tr2.topo.bin.ind]])
#boundary values file for hydrodynamics (filetype [[TR2.RBH.BIN.I|tr2.rbh.bin.i]] and filetype [[TR2.RBH.BIN|tr2.rbh.bin]])
#(optional) boundary values file for salinity (filetype [[TR2.RBS.BIN.I|tr2.rbs.bin.i]] and filetype [[TR2.RBS.BIN|tr2.rbs.bin]])
#(optional) boundary values file for suspended sediment concentration (filetype [[TR2.RBC.BIN.I|tr2.rbc.bin.i]] and filetype [[TR2.RBC.BIN|tr2.rbc.bin]])
#(optional) control structure boundary condition file (filetype [[TR2.RBW.BIN.I|tr2.rbw.bin.i]] and filetype [[TR2.RBW.BIN|tr2.rbw.bin]])
#(optional) wind field (filetype [[TR2.MET.BIN.I|tr2.met.bin.i]] and filetype [[TR2.MET.BIN|tr2.met.bin]])
#(optional) description of soil types (filetype [[SOIL.DAT|soil.dat]])
#(optional) distribution of soil types (filetype [[TR2.SOIL.BIN.IND|tr2.soil.bin.ind]])
#(optional) initial conditions (filetype [[TR2.RESULT|tr2.result]])
#:'''TR2first_H:''' hydrodynamics, depth of the bottom<br />
#:'''TR2first_S:''' salinity<br />
#:'''TR2first_C:''' suspended sediment concentration<br />
#:'''TR2first_B:''' deposited suspended sediments<br />
#:'''TR2first_L:''' bed load transport rate and deposited bed load material<br />
# (optional) profile-topography (filetype [[PROFIL05.BIN|profil05.bin]])
|outputfiles=
# computational results at the end of the simulation (filetype [[TR2.RESULT|tr2.result]])
#:'''TR2last_H:''' hydrodynamics, depth of the bottom<br />
#:'''TR2last_S:''' salinity<br />
#:'''TR2last_C:''' suspended sediment concentration<br />
#:'''TR2last_B:''' deposited suspended sediments<br />
#:'''TR2last_L:''' bed load transport rate and deposited bed load material<br />
#:'''TR2last_A:''' optional results (e.g. wind shear stress, bottom shear stress)<br />
#(optional, in case of morphodynamic simulation) final bathymetry and index arrays (filetype [[TR2.TOPO.BIN.IND|tr2.topo.bin.ind]])
#(optional) results files (filetype [[TR2.RESULT|tr2.result]])
#(optional) time series of computed results at specific locations (filetype [[KNOERG.BIN|knoerg.bin]])
#(optional) computed results along profiles (files of type [[DIRZ.BIN.R|dirz.bin.r]], [[DIRZ.BIN.I|dirz.bin.i]] and [[DIRZ.BIN|dirz.bin]])
#(optional) safety output of computational results at regular intervals (filetype [[TR2.RESULT|tr2.result]])
#:'''TR2save_H:''' hydrodynamics, depth of the bottom<br />
#:'''TR2save_S:''' salinity<br />
#:'''TR2save_C:''' suspended sediment concentration<br />
#:'''TR2save_B:''' deposited suspended sediments<br />
#:'''TR2save_L:''' bed load transport rate and deposited bed load material<br />
#:'''TR2save_A:''' optional results (e.g. wind shear stress, bottom shear stress)<br />
#printer file with informations about essential parameters used and informative messages during program execution (filetype trim2d.echo)
#(optional) trace of program execution (filetype trim2d.trc)
|methodology=See information in [http://www.baw.de/methoden/index.php5?title=Mathematisches_Verfahren_TRIM-2D&action=edit&redlink=1 the Standard Validation Document] (in German only).
|preprocessor=[[FD2MET]], [[MKRDAT]], [[TR2LQ2]], [[TR2VOR]], [[TR2RND]]
|postprocessor=[[DIDAMERGE]], [[DIDAMINTQ]], [[DIDARENAME]], [[DIDASPLIT]], [[ENERF]], [[GVIEW2D]], [[LQ2PRO]], [[PGCALC]], [[TIDKEN]], [[TR2APP]], [[TR2ASCII]], [[TR2DIDA]], [[TR2GEOM]], [[TR2KACHEL]], [[TR2MODATE]], [[TRIMKACH]], [[TRVZR]], [[VTDK]], [[VVIEW2D]], [[XTRDATA]], [[ZEITR]]
|language=Fortran90 
|add_software=- 
|contact_original=[mailto:vincenzo.casulli@ing.unitn.it V. Casulli], [mailto:rtcheng@usgs.gov R. T. Cheng],[mailto:günther.lang@baw.de G. Lang], [mailto:elisabeth.rudolph@baw.de  E. Rudolph]   
|contact_maintenance=[mailto:holger.weilbeer@baw.de  H. Weilbeer], [mailto:elisabeth.rudolph@baw.de  E. Rudolph]
|documentation=$PROGHOME/examples/trim2d/,
[http://www.baw.de/methoden/index.php5?title=Mathematisches_Verfahren_TRIM-2D&action=edit&redlink=1 Standard Validation Document] (in German only),
general informations: [http://www.baw.de/downloads/wasserbau/mathematische_verfahren/programmkennbl_de/pdf/nummeth1.pdf Numerische Methoden für Strömungen, Stoff- und Wärmetransport] (available in German only). 
}}