3A - Name of Velgrid INI
file - this is the name of the INI file loaded into the
dialog. The name of the INI file may be changed by clicking Change. Click
Reload, to reload the INI file specified - all changes made to the
dialog since last saving will be lost.
The Velgrid INI file
must be saved in a specific location, the
partrack\current-data sub-folder and must have the name
convention
of sitename-velgrid.ini. Some examples:
When using the Change button, the Change name of INI file dialog automatically filters for
*-velgrid.ini.
There is expected minimal sensitivity to these parameters.
3B - Velgrid switch -
check
this box to create an INI file with velocity grids specified. Uncheck
this to create an INI file for AutoDEPOMOD which does not have velocity
grids
(i.e. ADv3 will run using current data which are not spatially
varying). 3C Velocity grid file
details - specify the number of header lines in the
velocity grid files (these are the files created in step 1N).
Header lines are ignored by Velgrid.
Enter the number of timesteps in the model run, which must equal the
number of surface, mid and near bed files being entered in 2D - 2F.
Normally this would be 360 timesteps which corresponds to 360 files,
one for each hour in a spring-neap cycle.
The arbitrary example shows 2 files loaded.
3D - Specify current
velocity grid files for AutoDEPOMOD (surface) - load in
the surface velocity grids using the Add button, where
multiple file can be selected. These are the .PRN files created
in 1N.
Hints with organising files:
- follow the convention in 1M and 1N - e.g. *-tttt-s.dat for surface
files where tttt is a sequential number
-
when using the Add button, sorting files on Name, Date or Size often
groups files together allowing multiple select of a large number of
files:
Difficult to multiple select *0347_A* and *0348_A*
By sorting on Date Modified, *0347_A* and *0348_A* can
be multiple selected
- automatic sorting sorts the files alphabetically.
IMPORTANT - the order of files in 3D is the order the files are used in
the timeseries. e.g. t=1 is the file fiu_sur_0347_A_interpol.prn
and t=2 is the file fiu_sur_0348_A_interpol.prn, etc.
Click on Give Example button
to give an example of file name for 360 files.
3E - Specify current
velocity grid files for AutoDEPOMOD (mid) - specify the
name of the velocity grids for mid water - hints for loading files are
given in 3C.
3F - Specify current
velocity grid files for AutoDEPOMOD (mid) - specify the
name of the velocity grids for near-bed - hints for loading
files are given in 3C. 3G - Heights of layers
above bed (m) - these are the heights of the surface,
mid-water and near-bed layers (i.e. the middle of the layer).
3H - Difference between
grid north and true north -
true north is assumed to be the orientation of the hydrodynamic model
grid, and the velocity grids. Enter the difference between true north
and OS grid north, as the grid in AutoDEPOMOD is referenced to OS grid
north. Minus is west, positive is east.
A difference of 3 degrees West
is specified as -3, which means that 035 degrees T is converted to 038
degrees G.
3I - Resuspension model
options
If
required, check the box to prevent redeposition of particles in charted
depths less than 1 metre; this only applies to resuspended particles
and can be used to prevent redeposition in shoreline areas and drying
cells where the model has not been tested.
If Use redepositvs
is unchecked, then redepositing particles take the settling velocity of
the resuspended particle ensemble from which it is settling. If this is
checked, then a settling velocity of redepositing particles may be
specified. This can be used to simulate a change in the settling
characteristics of resuspended particles - break up of
resuspended
particles during advection in a turbulent environment can result in finer particles with a lower
settling velocity. 3J - Specify use of z in the resuspension equation
z
is used in calculation of a theoretical logarithmic profile at the
bed. In ADv2, this was fixed at z=1.8 m, regardless of the height of
the layer specified in the file C:\SEPA
Consent\DATA\sitename\depomod\partrack\current-data\sitename-NS-b.dat.
e.g. if the height of the near-bed current meter was 2.0 m above
the bed (bottom-meter@2m), in ADv2 the model used 2 m in the particle
tracking model to determine the layers between current meters and a z
of 1.8 m in the resuspension equation. In ADv3, the user may specify
that the logarithmic profile is calculated using the actual height
above the bed. e.g. if velocity grids are in use, then z equals
the height of the bottom layer above the bed specified in 3G. If velocity grids are not in use, then z = the value of the parameter "(bottom-meter@2m)" specified in C:\SEPA
Consent\DATA\sitename\depomod\partrack\current-data\sitename-NS-b.dat
In normal use, select z is specified or taken from -NS-b.dat (ADv3).
To exactly match runs undertaken in ADv2, select z is fixed (1.8m) (as in ADv2).
There is minor sensitivity to these parameters. 3K - Particle position accuracy
In
ADv2, the starting particle distribution in cages is calculated to 1
decimal place (i.e. 1/10th of minor grid cell size = 2.5 m normally).
As particles settled through the water column, there was no limit on
particle accuracy. As a particle deposited on the bed and was saved to
the inventory, its position was rounded to 1 decimal place. During
advection in the resuspension model, there was no limit on particle
position accuracy.
In ADv3, there is no limit on particle position accuracy throughout the whole modelling process.
In normal use, select No limit on accuracy (ADv3)
To exactly match runs undertaken in ADv2, select Limit to 1/10th of minor grid cell size (as in ADv2)
There is minimal sensitivity to these parameters.
3L - This is the name of the Velgrid INI file, and is changed in 3A.
3M - Generate INI file
- a Velgrid
INI file is generated with the name specified in 3A. If no
name is specified, then specify a name in 3A. Once a Velgrid INI file
has been generated, AutoDEPOMOD(v3) can be run.
If running AutoDEPOMOD
without velocity grids
Switch off the Velgrid
switch and then hit Generate
INI file. Use the Change
button to ensure that the file is saved to the correct location in the
sub-folder partrack\current-data
(examples).
Resuspension model options may also be changed (details), as may options for Specify use of z in resuspension equation (3J) and Particle position accuracy (3K).
There is expected minimal sensitivity to these parameters.
