Modelo de dimensionamento de bacias de acumulação para estradas

• Ano de defesa: 2009
• Autor(a) principal: Silva, Danilo Paulúcio da
• Orientador(a): Pruski, Fernando Falco
• Banca de defesa: Carvalho, Carlos Alexandre Braz de , Machado, Carlos Cardoso
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Engenharia Agrícola
• Departamento: Construções rurais e ambiência; Energia na agricultura; Mecanização agrícola; Processamento de produ
• País: BR
• Palavras-chave em Português: Erosão hídrica; Escoamento superficial; Práticas conservacionistas; Série sintética de precipitação
• Palavras-chave em Inglês: Erosion; Runoff; Conservation practices; Precipitation synthetic series
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ENGENHARIA AGRICOLA::ENGENHARIA DE AGUA E SOLO::CONSERVACAO DE SOLO E AGUA
• Link de acesso: http://locus.ufv.br/handle/123456789/3543

Besides their fundamental role in Brazilian economy, the unpaved roads have a highly important social role, since they allow for the access of the rural population to their basic needs such as health, education, leisure and work, that frequently are available only in the urban centers. So, taking into account that the main cause of degradation in the roads is the erosion caused by the concentration of the runoff along them, a model was developed for determination of the volume required for the accumulation basin addressed to store the water from runoff of the unpaved roads. The model was based on the principle that a daily analysis of the volume flowed in each event of the precipitation series is a more coherent criterion for dimensioning the accumulation basins, since the accumulative effect from the precipitations successively occurring in the series is considered. The model uses the synthetic rainfall data to obtaining the daily series of the flowed volumes, whereas the daily balance of the volume stored in the basin is accomplished with this series. The highest value obtained in each year is identified from the series of the stored volumes. So, an annual series of the highest volumes stored in the basin is created. Then, the Gumbel distribution is applied to this series in order to obtaining the volume required for the accumulation basin (VB). According to results, the following conclusions were drawn: for the lowest Tiebac value, the time needed for the water stored in the basin to infiltrate totally into soil is longer, therefore the accumulative effect of the precipitation events are more accentuated and, consequently, higher the VB value will be. When comparing the data obtained by the developed model with those of the model proposed by Griebeler et al. (2005), it was verified that, for the Tiebac equal to 2mm h-1, the VB values obtained by the developed model were always higher than those obtained by the model proposed by Griebeler et al. (2005), and an increased difference occurred with the increase in the return period (T). For the lowest values of Tiebac, the increase in the VB values from the increased T was, in general, proportionally higher for the model proposed by Griebeler et al. (2005) than for the developed model.