The purpose of this research is to estimate and evaluate the relation of the baseflow parameters and hydrogeological characteristics in an effluent river, with a study in the Gravataí River, state of Rio Grande do Sul. It has been noted that in Brazil there is a few information about the relationship of the baseflow parameters and hydrogeological characteristics. The information of streamflow was collected from Bourscheid (2012) determined from of HidroWeb of National Water Agency (ANA). The parameters of baseflow (Qb) that were evaluated are the baseflow index (BFI) and the recession coefficient (α). Also it were used the physiographic characteristics of sub-basins of Gravataí River as analysis tool to determine the relationship with hydrogeological characteristics, transmissivity (T) and coefficient of storage (S). The method of digital recursive filter of Eckhardt was used to separate baseflow. To calculate the BFImax it was used the methodology of Collischonn e Fan (2013). The results for of data series more representative sub-basin Passo das Canoas were Qmed=26,87m³/s; Qbmed=17,61m³/s, BFI=0,66; BFImax=0,68. To determinate the master recession curve and your coefficient α it was used the software RECESS (Rutledge, 1998), with α=0,0285 days⁻¹ as result for the Passo das Canoas sub-basin. The hydrogeological characteristics were obtained with pumping tests performed by CPRM, CORSAN, SOP, DRH-SEMA and HIDROGEO. The relationship of parameters of baseflow and the physiographic and hydrogeological characteristics were analyzed with the simple linear regression using statistical tools of coefficient of Pearson's correlation (R), the coefficient of determination (R²), probability p and significance (p<0,05) and the coefficient of relationship between the variables. The most important relations obtained were: Qbmed - área, R²=0,87; BFI - área, R²=0,92; α - S(α RECESS), R²=0,78; α - S (α Maillet), R²=0,73. For the determination of coefficient of storage S, the indirect method using α of Maillet and RECESS showed higher correlations and more reliable than the method with the information of pumping test. According to the established hypothesis, has some relationships with significance.
| Identifer | oai:union.ndltd.org:IBICT/oai:lume.ufrgs.br:10183/150809 |
| Date | January 2016 |
| Creators | Ledesma, Pablo Andrés Munive |
| Contributors | Silveira, André Luiz Lopes da |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, instname:Universidade Federal do Rio Grande do Sul, instacron:UFRGS |
| Rights | info:eu-repo/semantics/openAccess |
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