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PARSWMS: A Parallelized Model for Simulating Three-Dimensional Water Flow and Solute Transport in Variably Saturated Soils

Agrosphere, ICG-IV, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany

Correspondence: ^* Corresponding author (j.vanderborght{at}fz-juelich.de).

Received for publication 24 October 2006. ABSTRACT

Three-dimensional vadose zone models are used more and more for solving hydrological problems on a broad range of scales with large amount of nodes. Currently, the problems we can solve in reasonable computational time may have up to 5 · 10⁶ nodes. However, distributed models may need up to 10¹⁰ nodes to properly predict flow and transport at the watershed scale. The speed and efficiency of current flow and transport models therefore need to be improved. The parallelization of the code is one possible way to decrease the computational time by distributing a complex large geometry problem over multiple processors working in parallel. This is the solution we implemented by developing PARSWMS, a parallelized version of SWMS_3D (Simunek et al., 1995). The objective of this technical note is to describe the PARSWMS model, test its reliability, and show its performance and efficiency compared with single processor runs.

Abbreviations: CDE, convection–dispersion equations • MPI, Message-Passing Interface • PETSc, Portable, Extensive Toolkit for Scientific Computation.

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