Hidráulica do escoamento e transporte de sedimentos em sulcos em solo franco-argilo-arenoso

Cantalice, José Ramon Barros; Cassol, Elemar Antonino; Reichert, José Miguel; Borges, Ana Luiza de Oliveira

doi:10.1590/s0100-06832005000400012

Cited by 21 publications

(25 citation statements)

References 8 publications

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“…additionally, turbulent and supercritical flow were observed in rill R5 (fr ≥ 1.0), while in the other rills, the flow was subcritical (fr < 1.0) (table 4). the data from this study are similar to those recorded by Cantalice et al (2005) under simulated rainfall on preformed rills and without additional flow (run-on). However, the results of this study could not be compared directly to other studies because they were related to interrill (emmet, 1970;Cassol & Lima, 2003;nunes & Cassol, 2011) or rill initiation processes (dunne & aubry, 1986, Slattery & Bryan, 1992, or the experiment was performed on preformed rills (Cantalice et al, 2005).…”

Section: Hydraulic Flow Characteristics and Sediment Transportsupporting

confidence: 85%

“…other authors have commented on the difficulties of predicting sediment transport based on physical equations. Cantalice et al (2005) were able to explain 57 % of the sediment transport using the stream power property in a field experiment, while Slattery & Bryan (1992) could explain 77 % of the sediment transport for the same property in a laboratory experiment.…”

Section: Hydraulic Flow Characteristics and Sediment Transportmentioning

confidence: 93%

“…during this second erosion stage, transport occurs as concentrated flow (nonselective transport). Rills are formed and induce profound changes in hydraulic flow conditions, the geometric arrangement of channels and sediment transport (merz & Bryan, 1993, Cantalice et al, 2005, govers, et al, 2007. the first study of rill initiation indicated the role of overland flow velocity and depth (Horton, 1945).…”

Section: Introductionmentioning

confidence: 99%

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Runoff and sediment transport in a degraded area

Thomaz

2012

Rev. Bras. Ciênc. Solo

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aBStRaCtgully erosion occurs by the combined action of splash, sheetwash and rillwash (interrill and rill erosion). these erosion processes have a great capacity for both sediment production and sediment transport. the objectives of this experiment were to evaluate hydrological and sediment transport in a degraded area, severely dissected by gullies; to assess the hydraulic flow characteristics and their aggregate transport capacity; and to measure the initial splash erosion rate. in the study area in guarapuava, State of paraná, Brazil (lat 25° 24' S; long 51°24' W; 1034 m asl), the soil was classified as Cambissolo Húmico alumínico, with the following particle-size composition: sand 0.116 kg kg -1 ; silt 0.180 kg kg -1 ; and clay 0.704 kg kg -1 . the approach of this research was based on microcatchments formed in the ground, to study the hydrological response and sediment transport. a total of eight rill systems were simulated with dry and wet soil. an average rainfall of 33.7 ± 4.0 mm was produced for 35 to 54 min by a rainfall simulator. the equipment was installed, and a trough was placed at the end of the rill to collect sediments and water. during the simulation, the following variables were measured: time to runoff, time to ponding, time of recession, flow velocity, depth, ratio of the initial splash and grain size. the rainsplash of dry topsoil was more than twice as high as under moist conditions ( index terms: field measurement, water erosion, simulated rain, rainsplash, runoff.(1) Received for publication in January 05, 2011 and approved in november 15, 2011. (2)

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Section: Hydraulic Flow Characteristics and Sediment Transportsupporting

confidence: 85%

Section: Hydraulic Flow Characteristics and Sediment Transportmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Runoff and sediment transport in a degraded area

Thomaz

2012

Rev. Bras. Ciênc. Solo

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“…No Brasil são poucos estudos experimentais no campo e, de maneira geral, têm-se adotado a rotina de cálculo da erosão em sulcos do modelo da WEPP (Braida & Cassol, 1996;Schäfer et al, 2001;Cantalice et al, 2005) para o estabelecimento das relações entre Kr e τ c e as características físicas e químicas do solo, sendo ainda incipientes as informações obtidas.…”

Section: Summary: Soil Erosion Resistance In Ravines Inunclassified

“…Quando isso ocorre, a lâmina de escoamento desenvolve maior tensão de cisalhamento pelo aumento da espessura, elevando, portanto, a capacidade do escoamento em desagregar o solo. Em condições naturais, esses pequenos canais ocorrem de maneira espaçada e aleatória, formando uma rede de canais que pode desagregar e transportar grande quantidade de solo (Cantalice et al, 2005).…”

Section: Introductionunclassified

Resistência à erosão em ravinas, em latossolo argiloarenoso

Lafayette¹,

Cantalice

Coutinho³

2011

Rev. Bras. Ciênc. Solo

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As ravinas consistem em uma das formas de erosão hídrica com escoamento superficial concentrado em encostas de áreas degradadas e, ainda, sem escoamentos de subsuperfície. Os objetivos deste trabalho foram estudar o comportamento hidráulico do escoamento superficial das ravinas e determinar a erodibilidade (Kr) e a tensão crítica de cisalhamento (τc) na superfície de ravinas e, também, a erodibilidade (Kr) ao longo do perfil de encostas degradadas do litoral do Estado de Pernambuco. O experimento foi realizado em 2005, em um Latossolo Amarelo de textura argilosa pertencente à Formação Barreiras no município do Cabo de Santo Agostinho, PE. As parcelas foram delimitadas por chapas metálicas cravadas no solo no sentido do declive (1,0 m de largura por 3,0 m de comprimento). Os testes consistiram na aplicação de quatro níveis de vazão, determinando-se o volume de descarga líquida e a massa de sedimentos desagregados. As taxas de desagregação de solo foram lineares em relação às tensões de cisalhamento. Na superfície das ravinas, a erodibilidade (Kr) foi de 0,0016 kg N-1 s-1 e a tensão crítica de cisalhamento, de τc = 4,37 Pa. O baixo valor de erodibilidade e o alto de tensão crítica de cisalhamento de τc obtidos na superfície das ravinas possivelmente decorreram da formação de uma crosta superficial originada por ciclos de umedecimento e secagem. A erodibilidade (Kr) em profundidade variou entre 0,012 e 0,070 kg N-1 s-1, em função do teor de argila. O regime do escoamento superficial nas ravinas foi turbulento supercrítico e, portanto, semelhante ao do escoamento superficial nos sulcos de erosão, como descrito na literatura.

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The hydrodynamic mechanism of rainfall runoff from loess slopes treated with incorporated straw

et al. 2021

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The hydrodynamic parameters of rainfall runoff are important for those studying hillslope water flow, which in turn affects soil erosion, chemical pollutant migration, and diffusion. Straw incorporation into the cultivated soil layer may affect soil properties, resulting in different hydrodynamic behaviours of hillslope runoff. The objective of this study was to evaluate the influences of straw incorporation, rainfall intensity, and slope gradient on hydraulic parameters, such as the Reynolds number (Re), Froude number (Fr), Darcy‐Weisbach friction factor (f), and hydrodynamic dispersion coefficient (DH). Laboratory experiments were conducted under four straw incorporation rates (SRs: 0, 2, 4, and 8 t ha−1), three rainfall intensities (RIs: 80, 120, and 160 mm hr−1), and three slope gradients (SGs: 10, 15, and 20°) to examine the hydrodynamic characteristics. The results show that the increase in SR significantly reduces the DH. Compared with bare soil slope (0.020 m2 s−1), the mean DH decreased by half (0.011 m2 s−1) at an SR of 2 t ha−1 and approximately three‐quarters (0.005 m2 s−1) at an SR of 8 t ha−1. Both Re and Fr decreased with a rise in the SR; however, the slope roughness increased, which caused a significant increase in frictional force compared to results observed for the bare soil. A rise in RI and SG increased the driving force on the farmland slope. The Re and Fr decreased with RI and SR, while f increased with RI and SG. Therefore, this study elucidates that the incorporation of straw in the soil can alter the hydrodynamic parameters, thus influencing water flow velocity and soil erosion.

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Hidráulica do escoamento e transporte de sedimentos em sulcos em solo franco-argilo-arenoso

Cited by 21 publications

References 8 publications

Runoff and sediment transport in a degraded area

Runoff and sediment transport in a degraded area

Resistência à erosão em ravinas, em latossolo argiloarenoso

The hydrodynamic mechanism of rainfall runoff from loess slopes treated with incorporated straw

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