NDLI: Changes in the flood regime of São Francisco River (Brazil) from 1940 to 2006

Content Provider	Springer Nature Link
Author	Andrade e Santos, Hersília dos Santos Pompeu, Paulo Kenji, Danilo Okuma Lessa
Copyright Year	2011
Abstract	Flow regulation causes various environmental impacts in the downstream reaches of impounded rivers. The São Francisco River (SF) basin is Brazil’s third most important watershed. Several dams have been built in its course in the last four decades, mostly for flow regulation and hydropower generation. This paper presents an evaluation of historical changes in the flood regime. Three regions of the SF River basin, which are under the influence of different levels of regulation, were studied: the lower, middle, and upper SF River. The components of magnitude, frequency, and duration of floods were quantified for each region from 1940 to 1960 (prior to the construction of the first dam) and from 1986 to 2006 (after the last dam). The results have shown the inexistence of big floods in the downstream areas, decreasing durations of small floods as well as significant changes in the annual seasonality of floods. Reductions in the flood frequency were verified in all stretches, even in non-regulated systems, such as the lower Velhas River. The climate variation, which occurred in both period, was not able to explain the changes in the flood regime of São Francisco River; therefore, dams and other anthropogenic activity are the main factors promoting the temporal variability of streamflows in the São Francisco basin.
Starting Page	123
Ending Page	132
Page Count	10
File Format	PDF
ISSN	14363798
Journal	Regional Environmental Change
Volume Number	12
Issue Number	1
e-ISSN	1436378X
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-07-01
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Environmental flows Flood frequency Flow regulation Sao Francisco River Velhas River Oceanography Regional/Spatial Science Geography (general) Geology Climate Change Nature Conservation
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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