Real-world hydrologic assessment of a fully-distributed hydrological model in a parallel computing environment

Enrique Vivoni, Giuseppe Mascaro, Susan Mniszewski, Patricia Fasel, Everett P. Springer, Valeriy Y. Ivanov, Rafael L. Bras

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

A major challenge in the use of fully-distributed hydrologic models has been the lack of computational capabilities for high-resolution, long-term simulations in large river basins. In this study, we present the parallel model implementation and real-world hydrologic assessment of the Triangulated Irregular Network (TIN)-based Real-time Integrated Basin Simulator (tRIBS). Our parallelization approach is based on the decomposition of a complex watershed using the channel network as a directed graph. The resulting sub-basin partitioning divides effort among processors and handles hydrologic exchanges across boundaries. Through numerical experiments in a set of nested basins, we quantify parallel performance relative to serial runs for a range of processors, simulation complexities and lengths, and sub-basin partitioning methods, while accounting for inter-run variability on a parallel computing system. In contrast to serial simulations, the parallel model speed-up depends on the variability of hydrologic processes. Load balancing significantly improves parallel speed-up with proportionally faster runs as simulation complexity (domain resolution and channel network extent) increases. The best strategy for large river basins is to combine a balanced partitioning with an extended channel network, with potential savings through a lower TIN resolution. Based on these advances, a wider range of applications for fully-distributed hydrologic models are now possible. This is illustrated through a set of ensemble forecasts that account for precipitation uncertainty derived from a statistical downscaling model.

Original languageEnglish (US)
Pages (from-to)483-496
Number of pages14
JournalJournal of Hydrology
Volume409
Issue number1-2
DOIs
StatePublished - Oct 28 2011

Keywords

  • Ensemble forecasting
  • Parallel computing
  • Rainfall-runoff processes
  • Sub-basin partitioning
  • Watershed model

ASJC Scopus subject areas

  • Water Science and Technology

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