Name
Title | ||
|---|---|---|
Three-dimensional model for multi-component reactive transport with variable density groundwater flow |
Abstract | ||
|---|---|---|
PHWAT is a new model that couples a geochemical reaction model (PHREEQC-2) with a density-dependent groundwater flow and solute transport model (SEAWAT) using the split-operator approach. PHWAT was developed to simulate multi-component reactive transport in variable density groundwater flow. Fluid density in PHWAT depends not on only the concentration of a single species as in SEAWAT, but also the concentrations of other dissolved chemicals that can be subject to reactive processes. Simulation results of PHWAT and PHREEQC-2 were compared in their predictions of effluent concentration from a column experiment. Both models produced identical results, showing that PHWAT has correctly coupled the sub-packages. PHWAT was then applied to the simulation of a tank experiment in which seawater intrusion was accompanied by cation exchange. The density dependence of the intrusion and the snow-plough effect in the breakthrough curves were reflected in the model simulations, which were in good agreement with the measured breakthrough data. Comparison simulations that, in turn, excluded density effects and reactions allowed us to quantify the marked effect of ignoring these processes. Next, we explored numerical issues involved in the practical application of PHWAT using the example of a dense plume flowing into a tank containing fresh water. It was shown that PHWAT could model physically unstable flow and that numerical instabilities were suppressed. Physical instability developed in the model in accordance with the increase of the modified Rayleigh number for density-dependent flow, in agreement with previous research. |
Year | DOI | Venue |
|---|---|---|
2006 | 10.1016/j.envsoft.2004.11.008 | Environmental Modelling and Software |
Keywords | Field | DocType |
mt3dms,cation exchange,three-dimensional model,solute transport model,variable density groundwater flow,phwat,snow-plough effect,seawat,phreeqc-2,unstable flow,density dependence,fluid density,seawater intrusion,density-dependent flow,modflow,coastal groundwater flow and chemical transport/reaction,new model,geochemical reaction model,density-dependent groundwater flow,model simulation,density effect,multi-component reactive transport,chemical reactions,three dimensional,environmental sciences,groundwater flow,biodegradation,porous media,process simulation | MODFLOW,Plume,Groundwater flow,Hydrology,Computer science,Instability,Flow (psychology),Seawater,Rayleigh number,Porous medium | Journal |
Volume | Issue | ISSN |
21 | 5 | Environmental Modelling and Software |
Citations | PageRank | References |
12 | 3.31 | 2 |
Authors | ||
6 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Xuerong Mao | 1 | 1557 | 169.47 |
| H. Prommer | 2 | 20 | 7.01 |
| D. A. Barry | 3 | 12 | 3.31 |
| C. D. Langevin | 4 | 12 | 3.31 |
| B. Panteleit | 5 | 12 | 3.31 |
| L. Li | 6 | 23 | 7.77 |