Erodibilidade e tensão crítica de cisalhamento no canal de uma estrada não pavimentada situada em um Latossolo Vermelho-Amarelo

• Autor(a) principal: Enriquez, Adriana Gomez
• Data de Publicação: 2012
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/3628
• topic: Erosão hídrica, Escoamento superficial; Resistência do solo de erosão; Water erosion; Surface runoff; Soil erosion resistance; CNPQ::CIENCIAS AGRARIAS::ENGENHARIA AGRICOLA

The erosion in unpaved roads associated with the runoff has negative implication in social, economic and environmental development of a region. Therefore the incorporation of techniques for prevention and control of erosion on these roads is important. The techniques developed for this purpose require knowledge of the indices of soil resistance to erosion, principally the soil erodibility and critical shear stress. In this context, the aim of this study was to determine the erodibility and critical shear stress in the channel of an unpaved road implanted in an Oxisol horizons B and C. Study was conducted on an unpaved road in Viçosa-MG, Brazil, where the indices were obtained using a runoff simulator installed on the channel road, which allows to estimate soil loss associated with different shear stress. The results obtained in each test was adjusted using simple linear regression models and, the models identity test proceeded to obtain a representative value of the indices for the study site, and to obtain the confidence interval associated with the erodibility, considering 95% of probability. The erodibility value determined for the horizon B was 0.0044 g cm-2 min-1 Pa-1, and its associated confidence interval with 95% probability was 0.0035 to 0.0053 g cm-2 min-1 Pa-1. The critical shear stress determined for this horizon was 7.61 Pa. The horizon C erodibility value determined was 0.0347 g cm-2 min-1 Pa-1, and its xv associated confidence interval with 95% probability was 0.0288 to 0.0406 g cm-2 min-1 Pa-1. The critical shear stress value for this horizon was 8.16 Pa.