Appropriate spatial sampling of rainfall for flow simulation

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Abstract

The objective of this study is to find the appropriate number and location of raingauges for a river basin for flow simulation by using statistical analyses and hydrological modelling. First, a statistical method is used to identify the appropriate number of raingauges. Herein the effect of the number of raingauges on the cross-correlation coefficient between areally averaged rainfall and discharge is investigated. Second, a lumped HBV model is used to investigate the effect of the number of raingauges on hydrological modelling performance. The Qingjiang River basin with 26 raingauges in China is used for a case study. The results show that both cross-correlation coefficient and modelling performance increase hyperbolically, and level off after five raingauges (therefore identified to be the appropriate number of rain-gauges) for this basin. The geographical locations of raingauges which give the best and worst hydrological modelling performance are identified, which shows that there is a strong dependence on the local geographical and climatic patterns.
Original languageUndefined
Pages (from-to)279-298
JournalHydrological sciences journal
Volume50
Issue number2
DOIs
Publication statusPublished - 2005

Keywords

  • HBV model
  • Precipitation
  • raingauge network design
  • spatial sampling
  • METIS-217922
  • IR-60016
  • Flow simulation

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