Software Development
SSP&A is known for the significant role it has played in the development of groundwater modeling software.
The most widely used groundwater contaminant transport model, MT3D, was developed by staff of SSP&A and is presently marketed worldwide. The versatile particle-tracking model, PATH3D, was also developed by SSP&A staff and its development continues. Steven Larson, SSP&A Executive Vice President, was a co-author of the U. S. Geological Survey's groundwater flow model, "Finite-Difference Model for Simulation of Three-Dimensional Groundwater Flow." SSP&A staff also authored the textbook "Applied Contaminant Transport Modeling – Theory and Practice" which can be purchased with educational versions of SSP&A’s popular groundwater flow and transport software. Recently, SSP&A has collaborated with the USEPA to develop programs extending the simulation capabilities of MT3DMS Version 5, and with the USGS to develop programs for analyzing the uncertainty in numerical models with a focus on MODFLOW-2000.
Featured Projects
MT3D99 is SSP&A's professional implementation of the most recent version of MT3DMS, the world-leading, comprehensive three-dimensional numerical simulator for solute transport in complex hydrogeologic settings. MT3D99 has a modular design that permits simulation of transport processes independently or jointly.
KT3D-H20
Water Level Kriging with Analytic Element Drift Terms
SSP&A distributes programs that implement the kriging technique together with analytic element drift terms to represent point, line, and circular sink/source terms, as described by Tonkin and Larson (2002) and Karanovic et al, (2009). The code allows users to combine regional-linear and point/line/circular-logarithmic drifts in their mapping of groundwater-level data, accounting for drawdown or mounding using deterministic functions derived from analytic element theory for the curvature of the potentiometric surface.
MPNE1D
A General Analytical Solution for One-Dimensional Solute Transport
The code MPNE1D implements the general analytical solution for one-dimensional solute transport derived by C.J. Neville, M. Ibaraki, and E.A. Sudicky, 2000: “Solute Transport with Multiprocess Nonequilibrium: A Semi-analytical Approach” (Journal of Contaminant Hydrology, vol. 44, pp. 141-159). The code is included in the IGWMC collection of freeware for hydrogeology.