Effect of a reservoir network on drought propagation in a semi-arid catchment in Brazil

Simone C.H. van Langen, Alexandre C. Costa*, Germano G. Ribeiro Neto, Pieter R. van Oel

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)

Abstract

Building reservoirs is a response to cope with drought in drylands. However, this human modification to the landscape may trigger both positive and negative effects. Here, we investigate how a network of reservoirs influences the propagation of meteorological drought (MD) into hydrological drought (HD) in a large semi-arid catchment in Brazil. We applied 12-month standardized indices to classify droughts. Then, the drought series were compared to each other. The downstreamness concept was used to describe the spatial water distribution. The onset of reservoir drought (RD) was much later than MD, but the delay between MD and RD peaks was even longer. Streamflow drought started with a small delay after MD, but it transformed into a similar RD. RD was initially more severe downstream. When the drought severity was at its highest, upstream and downstream RD equalized. The perceptual model of drought propagation may help in developing reservoir management systems in drylands.

Original languageEnglish
Pages (from-to)1567-1583
JournalHydrological Sciences Journal
Volume66
Issue number10
Early online date13 Aug 2021
DOIs
Publication statusPublished - 2021

Keywords

  • downstreamness
  • human-modified drought
  • hydrological drought
  • meteorological drought
  • semi-arid reservoir network
  • standardized reservoir storage index

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