Darcy Flow and Velocity, Particle Track, Porous Puff Tools
Darcy Flow
How to use Darcy Flow Tool in Arc Toolbox??
 |
| Darcy Flow |
Path to access the tool
:
Darcy
Flow Tool, Groundwater Toolset, Spatial Analyst Tools Toolbox
Darcy Flow
Calculates the
groundwater volume balance residual and other outputs for steady flow in an
aquifer.
1. Input groundwater head elevation raster
The input raster where
each cell value represents the groundwater head elevation at that location.
The head is typically an
elevation above some datum, such as mean sea level.
2. Input effective formation porosity raster
The input raster where
each cell value represents the effective formation porosity at that location.
3. Input saturated thickness raster
The input raster where
each cell value represents the saturated thickness at that location.
The value for the
thickness is interpreted from geological properties of the aquifer.
4. Input formation transmissivity raster
The input raster where
each cell value represents the formation transmissivity at that location.
The transmissivity of an
aquifer is defined as the hydraulic conductivity K times the saturated aquifer
thickness b, as units of length squared over time. This property is generally
estimated from field experimental data such as pumping tests. Tables 1 and 2 in
How Darcy Flow and Darcy Velocity work list ranges of hydraulic conductivities
for some generalized geologic materials.
5. Output groundwater volume balance residual raster
The output volume
balance residual raster.
Each cell value represents
the groundwater volume balance residual for steady flow in an aquifer, as
determined by Darcy's Law.
6. Output direction raster (optional)
The output flow
direction raster.
Each cell value
represents the direction of the seepage velocity vector (average linear
velocity) at the center of the cell, calculated as the average value of the
seepage velocity through the four faces of the cell.
It is used with the
output magnitude raster to describe the flow vector.
7. Output magnitude raster (optional)
An optional output
raster where each cell value represents the magnitude of the seepage velocity
vector (average linear velocity) at the center of the cell, calculated as the
average value of the seepage velocity through the four faces of the cell.
It is used with the
output direction raster to describe the flow vector.
Darcy Velocity
How to use Darcy Velocity Tool in Arc Toolbox??
 |
| Darcy Velocity |
Path to access the tool
:
Darcy
Velocity Tool, Groundwater Toolset, Spatial Analyst Tools Toolbox
Darcy Velocity
Calculates the
groundwater seepage velocity vector (direction and magnitude) for steady flow
in an aquifer.
1. Input groundwater head elevation raster
The input raster where
each cell value represents the groundwater head elevation at that location.
The head is typically an
elevation above some datum, such as mean sea level.
2. Input effective formation porosity raster
The input raster where
each cell value represents the effective formation porosity at that location.
3. Input saturated thickness raster
The input raster where
each cell value represents the saturated thickness at that location.
The value for the
thickness is interpreted from geological properties of the aquifer.
4. Input formation transmissivity raster
The input raster where
each cell value represents the formation transmissivity at that location.
The transmissivity of an
aquifer is defined as the hydraulic conductivity K times the saturated aquifer thickness
b, as units of length squared over time. This property is generally estimated
from field experimental data such as pumping tests.
Tables 1 and 2 in How Darcy
Flow and Darcy Velocity work list ranges of hydraulic conductivities for some
generalized geologic materials.
5. Output direction raster
The output flow
direction raster.
Each cell value
represents the direction of the seepage velocity vector (average linear
velocity) at the center of the cell, calculated as the average value of the
seepage velocity through the four faces of the cell.
It is used with the
output magnitude raster to describe the flow vector.
6. Output magnitude raster
The output flow
direction raster.
Each cell value
represents the direction of the seepage velocity vector (average linear
velocity) at the center of the cell, calculated as the average value of the
seepage velocity through the four faces of the cell.
It is used with the
output magnitude raster to describe the flow vector.
Particle Track
How to use Particle Track Tool in Arc Toolbox??
 |
| Particle Track |
Path to access the tool
:
Particle
Track Tool, Groundwater Toolset, Spatial Analyst Tools Toolbox
Particle Track
Calculates the path of a
particle through a velocity field, returning an ASCII file of particle tracking
data and, optionally, a feature class of track information.
1. Input direction raster
An input raster where
each cell value represents the direction of the seepage velocity vector
(average linear velocity) at the center of the cell.
Directions are expressed
in compass coordinates, in degrees clockwise from north. This can be created by
the Darcy Flow tool.
Direction values must be
floating point.
2. Input magnitude raster
An input raster where
each cell value represents the magnitude of the seepage velocity vector (average
linear velocity) at the center of the cell.
Units are length/time.
This can be created by the Darcy Flow tool.
3. Source point
The location of the
source point from which to begin the particle tracking.
This is entered as
numbers identifying the x,y coordinates of the position in map units.
4. Output particle track file
The output ASCII text
file that contains the particle tracking data.
5. Step length (optional)
The step length to be
used for calculating the particle track.
The default is one-half
the cell size. Units are length.
6. Tracking time (optional)
Maximum elapsed time for
particle tracking.
The algorithm will
follow the track until either this time is met or the particle migrates off the
raster or into a depression.
The default value is
infinity. Units are time.
7. Output track polyline features (optional)
The optional output line
feature class containing the particle track.
This feature class contains a series of arcs with attributes for position, local velocity direction and magnitude, and cumulative length and time of travel along the path.
Porous Puff
How to use Porous Puff Tool in Arc Toolbox??
 |
| Porous Puff |
Path to access the tool
:
Porous
Puff Tool, Groundwater Toolset, Spatial Analyst Tools Toolbox
Porous Puff
Calculates the
time-dependent, two-dimensional concentration distribution in mass per volume
of a solute introduced instantaneously and at a discrete point into a
vertically mixed aquifer.
1. Input particle track file
The input particle track
path file.
This is an ASCII text
file containing information about the position, the local velocity vector, and
the cumulative length and time of travel along the path.
This file is generated
using the Particle Track tool.
2. Input effective formation porosity raster
The input raster where
each cell value represents the effective formation porosity at that location.
3. Input saturated thickness raster
The input raster where
each cell value represents the saturated thickness at that location.
The value for the
thickness is interpreted from geological properties of the aquifer.
4. Output raster
The output raster of the
concentration distribution.
Each cell value
represents the concentration at that location.
5. Mass
A value for the amount
of mass released instantaneously at the source point, in units of mass.
6. Dispersion time (optional)
A value representing the
time horizon for dispersion of the solute, in units of time.
The time must be less
than or equal to the maximum time in the track file. If the requested time
exceeds the available time from the track file, the tool is aborted. The
default time is the latest time (corresponding to the terminal point) in the
track file.
7. Longitudinal dispersivity (optional)
A value representing the
dispersivity parallel to the flow direction.
For details on how the
default value is determined, and how it relates to the scale of the study, see
the How Porous Puff works section in the documentation.
8. Dispersivity ratio (optional)
A value representing the
ratio of longitudinal dispersivity over transverse dispersivity.
Transverse dispersivity
is perpendicular to the flow direction in the same horizontal plane. The
default value is three.
9. Retardation factor (optional)
A dimensionless value
representing the retardation of the solute in the aquifer.
Retardation varies
between one and infinity, with one corresponding to no retardation. The default
value is one.
10. Decay coefficient (optional)
Decay coefficient for
solutes undergoing first-order exponential decay (for example, radionuclides)
in units of inverse time.
The default is zero, corresponding to no decay.
Comments
Post a Comment