ESTIMATIVA DE PARÂMETROS HIDRODINÂMICOS DE AQUÍFEROS EM ÁREAS DE EMBASAMENTO ATRAVÉS DE MÉTODOS INDIRETOS / ESTIMATIVA DE PARÂMETROS HIDRODINÂMICOS DE AQUÍFEROS EM ÁREAS DE EMBASAMENTO ATRAVÉS DE MÉTODOS INDIRETOS

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

18/12/2009

RESUMO

The recession represents the period when the rivers flow is maintained predominately by subterranean water return, so establishing the base flux. In hydrographic basins, the recession coefficient (or of drain) can be determined in an indirect manner by several graph methods using series of hydrologic data. From this coefficient is possible to calculate other important parameters, like the aquifer transmissivity. The recession coefficient still turns possible to get information about the minimal flow in the drainage channels, that usually are obtained toward other hydrological indexes, as the Q7,10, frequently used in management of superficial hydrological resource. In this work were determined the recession coefficient, the transmissivity and the store coefficient for six basins, towards several indirect methods. There were also calculated some morfometrics indexes, how the amplitude, the slope index and the compactness index, allowing thus the correlation between the morfometrics characteristics of the basins and their hemodynamic parameters. The methods used to determine the recession coefficient were: Maillet, Boussinesq, Correlation, Matching Strip e Drogue. To obtain the transmissivity, beyond the use of recession coefficient of Maillets and Boussinesqs methods, the Brutsaert method was used too; however, this last method presented results much higher than the traditionally described in the literature. The basins studied occur in regions where the predominance is of granite-gnaissic rocks, and under similar vegetation, climatic, use and occupancy, located in the Central-South region of Minas Gerais state. One of those is the Maracujá river basin, inserted in the Metamórfico Bação complex, on Quadrilátero Ferrífero (QF). The other basins are located at west of QF, on the Metamórfico Campo Belo complex. Regarding the used methods, was verified that, the Boussinesq method presented the best relation between their recession and transmissivity coefficients when confronted with others indexes of the basins, as area, Q7,10, compactness index and slope index. From the analysis of the results and the previous results were ascertained that the biggest basins with most plan relief have bigger capacity to store water, liberating it slowly, so contributing for the sustainable maintenance of the base flux. In head basins this behavior is reverse. The estimate of renewable reserves from the recession coefficient provides results that can be used how a tool of determination of subterranean water quantity to be explored on the basins. The results revealed that the recession coefficient constitute an efficient parameter of interest for the subterranean water explore and to manage the hydrographic basins.

ASSUNTO(S)

- - geologia ambiental

ACESSO AO ARTIGO

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