NewANTS is a collection of analytical (and some semi-analytical) solutions to various forms of the advection-dispersion equation in different geometries.
A brief discussion of important terms (used in the scripts) is presented here. More in-depth discussion appears in the User Manual.
NewANTS presents web pages which are interfaces to the computation engines.
The web pages should prompt with input boxes that request various hydraulic and transport parameters. These parameters are:
Source Location is the location of a source. If not specifically requested in the input interface, the source is located at (x,y,z,t) = (0,0,0,0).
Distance is the location of interest from a source. If not specifially indicated then the distance is along the x-axis. For 2D and 3D cases, the specific axis will be indicated.
Time means the elapsed time from t=0.
Velocity is the mean section velocity of the flow field. In a groundwater system (for which ANTS was orginially designed) the value would be equal to the ratio of specific discharge and porosity. The velocity should be determined by the user before interrogating the models.
Dispersion Coefficient is the dispersion coefficient along the flow axis. For 2D and 3D cases, the specific axis (x, y, and/or z) will be indicated.
Dispersivity is the dispersivity along the flow axis. For 2D and 3D cases, the specific axis (x, y, and/or z) will be indicated.
Retardation Coefficient is the species retardation based on the linear equilibrium assumption (LEA) for approximating species interaction with the solids matrix.
Source Decay Coefficient is the decay rate of mass at the source location.
0-th Order Species Reaction (Decay) Coefficient is the Zero-order reaction rate of mass of the consituient in the flow field (after it has left the source).
1-st Order Species Reaction (Decay) Coefficient is the First-order reaction rate of mass of the consituient in the flow field (after it has left the source).
Injection Rate is the mass (volume) flow rate of injection liquid.
A concentration profile in NewANTS is a plot or tabulation of concentration versus position at some prescribed moment in time. The plots will be of the type C(x,t), where t=fixed, and only x (and C) vary.
The image above is an illustration of the x-t plane, with the vertical axis the C(x,t) axis. At the source, the concentration is some fixed value. From the origin, moving upward and to the right is the time axis. From the origin, moving downward and to the right is the space (distance) axis. A yellow line in the x-t plane is x=vt (sometimes called the solution trajectory). Along the time axis, is a point in time indicated by t*. From this point moving downward and to the right is a plot (increasing distance) which is a concentration profile plot.
A concentration history in NewANTS is a plot or tabulation of concentration versus time at some prescribed position in space. The plots will be of the type C(x,t), where x=fixed, and only t (and C) vary.
The image above is an illustration of the x-t plane, with the vertical axis the C(x,t) axis. At the source, the concentration is some fixed value. From the origin, moving upward and to the right is the time axis. From the origin, moving downward and to the right is the space (distance) axis. A yellow line in the x-t plane is x=vt (sometimes called the solution trajectory). Along the space (x) axis, is a point in space indicated by x*. From this point moving upward and to the right is a plot (increasing time) which is a concentration history plot.
