Development of the Global Width Database for Large Rivers

Dai Yamazaki*, Fiachra O'Loughlin, Mark A. Trigg, Zachary F. Miller, Tamlin M. Pavelsky, Paul D. Bates

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

129 Citations (Scopus)

Abstract

River width is a fundamental parameter of river hydrodynamic simulations, but no global-scale river width database based on observed water bodies has yet been developed. Here we present a new algorithm that automatically calculates river width from satellite-based water masks and flow direction maps. The Global Width Database for Large Rivers (GWD-LR) is developed by applying the algorithm to the SRTM Water Body Database and the HydroSHEDS flow direction map. Both bank-to-bank river width and effective river width excluding islands are calculated for river channels between 60S and 60N. The effective river width of GWD-LR is compared with existing river width databases for the Congo and Mississippi Rivers. The effective river width of the GWD-LR is slightly narrower compared to the existing databases, but the relative difference is within 20% for most river channels. As the river width of the GWD-LR is calculated along the river channels of the HydroSHEDS flow direction map, it is relatively straightforward to apply the GWD-LR to global and continental-scale river modeling.

Key Points

Global Width Database for Large Rivers (GWD-LR) based on satellite water mask River width of GWD-LR is calculated along the HydroSHEDS flow direction map GWD-LR shows good consistency to existing basin-scale river width data sets

Original languageEnglish
Pages (from-to)3467-3480
Number of pages14
JournalWater Resources Research
Volume50
Issue number4
DOIs
Publication statusPublished - Apr 2014

Keywords

  • river width
  • global database
  • HydroSHEDS
  • SWBD
  • hydrodynamic modeling
  • AMAZON BASIN
  • WATER
  • RESOLUTION

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