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ARS Home » Pacific West Area » Hilo, Hawaii » Daniel K. Inouye U.S. Pacific Basin Agricultural Research Center » Tropical Plant Genetic Resources and Disease Research » Research » Research Project #423020

Research Project: Parallelization of the SWAT Watershed Model for Application on the Supercomputers at the Hawaii Supercomputer Center

Location: Tropical Plant Genetic Resources and Disease Research

Project Number: 5320-21000-014-04-S
Project Type: Non-Assistance Cooperative Agreement

Start Date: May 16, 2012
End Date: Jul 30, 2013

To efficiently run the SWAT watershed model on a supercomputer for application to water management and sustainability on Maui.

To develop spatially detailed surface and groundwater models for the island of Maui and to take advantage of the power of supercomputers, the SWAT model needs to be parallelized to run on multiple processors. Two approaches will be analyzed and developed to parallelize the SWAT model simulations. The first approach is to disaggregate SWAT input files to simulate each individual subwatershed within a basin as a separate model run. This allows each subwatershed to be run simultaneously on different processes. It requires the subwatersheds to be run in sequence defined by stream order and passing large output files between simulations. The second approach requires SWAT to be recoded to run the entire basin in parallel. Scientists at the University of Hawaii have considerable expertise in developing parallel code and have programming techniques to run subwatersheds on different processors within the same simulation. A SWAT simulation for the entire island of Maui will be developed and both parallelization methods will be run on at the Hawaii Open Supercomputer Center. Advantages and disadvantages of each approach will be analyzed. Also, we will examine the potential link of SWAT to the groundwater model, MODFLOW, and define issues related to linking the models and running the combined model in parallel on a supercomputer.