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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Aquifer Responses to Rainfall through Spectral and Correlation Analysis

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Gomez, Derly [1] ; Melo, Davi C. D. [2] ; Rodrigues, Dulce B. B. [3] ; Xavier, Alexandre C. [4] ; Guido, Rodrigo C. [5] ; Wendland, Edson [1]
Total Authors: 6
[1] Univ Sao Paulo, Dept Hydraul & Sanit Engn, Sao Carlos, SP - Brazil
[2] Univ Fed Paraiba, Dept Soils & Rural Engn Melo, Areia, Paraiba - Brazil
[3] Univ Fed Mato Grosso do Sul, Fac Engn Architecture & Urbanism & Geog, Campo Grande, MS - Brazil
[4] Univ Fed Espirito Santo, Dept Rural Engn, Alegre, ES - Brazil
[5] Sao Paulo State Univ, UNESP, Dept Comp Sci, Sao Jose Do Rio Preto, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Web of Science Citations: 2

The response time of hydrological components is an important feature for establishing the connections within a hydrological system and for characterizing it. This study proposes a quantitative and qualitative assessment on the response times of river discharge components, especially the baseflow, regarding the impulse provided by precipitation, using time series analyses of time and frequency domains. To this end, a set of complementary methods including correlation and spectral approaches was used, which are: autocorrelation, cross correlation, continuous wavelet transform, and cross wavelet transform. Such framework was applied in multiple and nested basin scales (53, 1,867, and 3,519 km(2)), located in the Jacare-Guacu River Basin (Southeastern Brazil). Based on a digital filtering technique, it was found the baseflow contributes more than 80% of the annual streamflow, revealing a major role of the aquifer in regulating the river discharge in all three studied basins. In addition, we found baseflow represents a range of 24%-27% of the annual precipitation. The uniform results are mainly due to the similar physical characteristics found in those areas. Overall, our framework indicates a baseflow response time for a precipitation of approximately two years for the smaller basins and three years for the biggest one. Such results can support the water allocation in conjunctive water management, by providing estimates of future surface water availability. (AU)

FAPESP's process: 15/03806-1 - Water availability and quality threats in a Guarani Aquifer System outcrop zone
Grantee:Edson Cezar Wendland
Support type: Program for Research on Bioenergy (BIOEN) - Thematic Grants
FAPESP's process: 16/23546-7 - Water availability under extreme events: droughts in the Paraná Basin region
Grantee:Davi de Carvalho Diniz Melo
Support type: Scholarships in Brazil - Post-Doctorate