Runoff erosion process on different underlying surfaces from disturbed soils in the Three Gorges Reservoir Area, China

Peng, X. S.; Shi, Dongmei; Jiang, Dong; Wang, Sanshu; Li, Yexin

doi:10.1016/j.catena.2014.08.012

Cited by 65 publications

(35 citation statements)

References 45 publications

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“…In general, rill flow on cultivated slopes in the different growth stages of maize was mainly classified as subcritical transition flow. Peng et al () also concluded that run‐off regimes in disturbed soil areas display subcritical flow during the run‐off scouring process. The rill flow patterns in the seedling stage extended into the subcritical turbulent flow class, and subcritical laminar flow area was observed during the tasseling stage.…”

Section: Discussionmentioning

confidence: 99%

“…A flow regime is affected by the turbulence intensity of the flow and is directly related to the calculation of sediment transport on a slope. In general, rill flow on cultivated slopes in the different growth stages of maize was mainly classified as subcritical transition flow Peng et al (2014). also concluded that run-off regimes in disturbed soil areas display subcritical flow during the run-off scouring process.…”

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confidence: 92%

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The changing dynamics of rill erosion on sloping farmland during the different growth stages of a maize crop

Luo

Zheng

et al. 2018

Hydrological Processes

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Rill erosion is a serious concern in the hilly region of China with purple soil, and maize is extensively cultivated in this region. Evaluations of the dynamic mechanisms of rill erosion in sloping farmland areas are particularly important during the maize growing season to determine whether rill erosion can occur. A new ridge tillage (RT) system was designed using local agricultural methods in China. Twelve artificial rainfall experiments were conducted in three 1 × 2 m experimental plots with a slope of 15°, which is a typical slope in the study area. The rainfall intensities were designated as 1.0, 1.5, and 2.0 mm min−1. The rainfall experiments were performed in the field to determine the characteristics of run‐off and sediment transport related to rill erosion processes during different stages of maize growth and to analyse how hydraulic parameters and the sediment yield of the rill erosion process are related. The results showed that rill flow patterns were mainly classified as subcritical transition flow during all the growth stages of maize. The effects of hydrodynamic parameters on the sediment yield were ordered as follows: Reynolds number > stream power > Froude number > shear stress. The total sediment yield varied by stage as follows: seedling stage > jointing stage > mature stage > tasseling stage. The sediment yield and run‐off rate exhibited a linear relationship that was well described at the hillslope scale. To initiate soil loss in sloping farmland areas with purple soil during the maize growing season, the critical hydrodynamic shear stress and stream power must be at least 46.505 Pa and 1.541 N m−1 s−1, respectively.

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Section: Discussionmentioning

confidence: 99%

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confidence: 92%

The changing dynamics of rill erosion on sloping farmland during the different growth stages of a maize crop

Luo

Zheng

et al. 2018

Hydrological Processes

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“…soil underground leakage (Peng et al, 2016), which caused little runoff and soil loss observed on surface of karst slope (Peng & Wang, 2012). This obviously differs from the slope of non karst region (Cerdà et al, 2009;Cerdà et al, 2010;Peng et al, 2014;Vente et al, 2014). Hence, revealing soil erosion process in karst areas has drawn greater attention for many scientists in the world.…”

Section: Introductionmentioning

confidence: 99%

Effects of Underground Pore Fissures on Soil Erosion and Sediment Yield on Karst Slopes

et al. 2017

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Underground pore fissure is one of common ways of soil leakage, and the soil loss in underground pore fissure would aggravate the development of rocky desertification in karst areas. A designed steel tank with varied underground pore fissure degrees was used to measure how underground pore fissure affected soil erosion and sediment yield on karst bare slope. We found that sediment yield rates and its distribution ratios obviously differed between the surface and underground. Surface sediment yield rate greatly responded to rainfall intensity conditions, while underground sediment yield rate rarely changed. Both bed rock bareness and underground pore fissure degree had an insignificant effect on both surface and underground sediment yield rate, but the former greatly influenced sediment distribution between the surface and underground. With increasing of bed rock bareness rate, both the average surface and underground sediment yield rates first increased and then decreased. The later posed an effect on underground sediment yield rate, which increased with increase of underground pore fissure degree. With increase of underground pore fissure degree, critical rainfall intensity for producing surface sediment would increase from 0.8–1.3 mm min−1 to 1.3–2.0 mm min−1. The results provide a mechanistic understanding of how underground pore fissure affects soil erosion and sediment production. Copyright © 2017 John Wiley & Sons, Ltd.

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“…Many reasons, such as shallow and loose soil layer, improper land use and numerous rainstorms, have caused serious soil erosion in the purple soil region, which is a major environmental problem in China (Fu et al, 2011;Peng et al, 2014). Average soil erosion rates in the purple soil region have reached 3400 t km -2 year -1 , in some areas, even reached 9000 t km -2 year -1 (Wen et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Hydraulic characteristics and sediment generation on slope erosion in the Three Gorges Reservoir Area, China

Feng

Cheng

Ding

et al. 2016

Journal of Hydrology and Hydromechanics

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Hydrological processes play important roles in soil erosion processes of the hillslopes. This study was conducted to investigate the hydrological processes and the associated erosional responses on the purple soil slope. Based on a comprehensive survey of the Wangjiaqiao watershed in the Three Gorges Reservoir, four typical slope gradients (5°, 10°, 15°and 20°) were applied to five rainfall intensities (0.6, 1.1, 1.61, 2.12 and 2.54 mm·min -1 ). The results showed that both surface and subsurface runoff varied greatly depending on the rainfall intensity and slope gradient. Surface runoff volume was 48.1 to 280.1 times of that for subsurface runoff. The critical slope gradient was about 10°. The sediment yield rate increased with increases in both rainfall intensity and slope gradient, while the effect of rainfall intensity on the sediment yield rate was greater than slope gradient. There was a good linear relationship between sediment yield rate and Reynolds numbers, flow velocity and stream power, while Froude numbers, Darcy-Weisbach and Manning friction coefficients were not good hydraulic indicators of the sediment yield rate of purple soil erosion. Among the three good indicators (Re, v and w), stream power was the best predictor of sediment yield rate (R 2 = 0.884). Finally, based on the power regression relationship between sediment yield rate, runoff rate, slope gradient and rainfall intensity, an erosion model was proposed to predict the purple soil erosion (R 2 = 0.897). The results can help us to understand the relationship between flow hydraulics and sediment generation of slope erosion and offer useful data for the building of erosion model in purple soil.

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Runoff erosion process on different underlying surfaces from disturbed soils in the Three Gorges Reservoir Area, China

Cited by 65 publications

References 45 publications

The changing dynamics of rill erosion on sloping farmland during the different growth stages of a maize crop

The changing dynamics of rill erosion on sloping farmland during the different growth stages of a maize crop

Effects of Underground Pore Fissures on Soil Erosion and Sediment Yield on Karst Slopes

Hydraulic characteristics and sediment generation on slope erosion in the Three Gorges Reservoir Area, China

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