Influence of the distance of installation of tensiometers to calculate total potential gradient in the field soil hydraulic conductivity determination / Influência da distância de instalação de tensiômetros no campo para o cálculo do gradiente de potencial total no método do perfil instantâneo

AUTOR(ES)

Mariana Ventura Martins

DATA DE PUBLICAÇÃO

2009

RESUMO

The soil hydraulic conductivity determination method most used under unsaturated field conditions is the instantaneous profile method. This method is based on the integration of Richards equation in relation to soil depth, during the soil water redistribution process, after the profile has been saturated till the interest depth and the soil surface prevented to water flux. The equation that results from the method requires the knowledge of the total potential gradient at the interest depth during the redistribution depth. The basic hypothesis of this work is that there is an installation correct distance of the tensiometer porous cups to calculate the total potential gradient in the instantaneous profile method that provides less error to the hydraulic conductivity determination. In two very distinct texture soil. A metallical rectangular structure of 4.50 m length, 3.00 m width and 0.60 m depth was installed into the soil profile, leaving 0.20 m of its depth above the soil surface. In the center of the delimited area, 26 mercury tensiometers were installed at each 25 mm along the profile from soil depth of 0.10 m to 0.60 m, to calculate the total potential gradient at the 0.50 m soil depth. The gradient used as reference was that calculated by differentiation of the fitted curve of total potential as a function of the vertical position coordinate for the depth of 0.50 m; the other gradients were calculated by finite differences using the distances of 0.05, 0.10, 0.15 and 0.20 m between installed porous cups. Among these values, only the distance of 0.05 m resulted in gradients different of the reference for both soils. Therefore, the other distances (0.10, 0.15 and 0.20 m) away be recommended to calculated the soil water total potential by finite differences in the instantaneous profile method. Would be concluded that the assumption of unit gradient was not suitable for the data obtained for the sandy soil, underestimating the hydraulic conductivity by up to 75%.

ASSUNTO(S)

soil hydraulic conductivity-determination-methods. soil water condutividade hidráulica do solo - determinação - métodos. Água do solo

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