Proof of concept of regional scale hydrologic simulations at hydrologic resolution utilizing massively parallel computer resources
Article first published online: 20 APR 2010
Copyright 2010 by the American Geophysical Union.
Water Resources Research
Volume 46, Issue 4, April 2010
How to Cite
2010), Proof of concept of regional scale hydrologic simulations at hydrologic resolution utilizing massively parallel computer resources, Water Resour. Res., 46, W04201, doi:10.1029/2009WR008730., , , , , , and (
- Issue published online: 20 APR 2010
- Article first published online: 20 APR 2010
- Manuscript Accepted: 15 FEB 2010
- Manuscript Revised: 19 JAN 2010
- Manuscript Received: 2 OCT 2009
- hydrologic simulations;
- parallel computing
 We present the results of a unique, parallel scaling study using a 3-D variably saturated flow problem including land surface processes that ranges from a single processor to a maximum number of 16,384 processors. In the applied finite difference framework and for a fixed problem size per processor, this results in a maximum number of approximately 8 × 109 grid cells (unknowns). Detailed timing information shows that the applied simulation platform ParFlow exhibits excellent parallel efficiency. This study demonstrates that regional scale hydrologic simulations on the order of 103 km2 are feasible at hydrologic resolution (∼100–101 m laterally, 10−2–10−1 m vertically) with reasonable computation times, which has been previously assumed to be an intractable computational problem.