The characteristics of rill development and their effects on runoff and sediment yield under different slope gradients

He, Jin; Sun, Liying; Gong, Huili; Qiangguo, Cai; Jia, Lijuan

doi:10.1007/s11629-015-3490-1

Cited by 35 publications

(22 citation statements)

References 29 publications

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“…The variation tendency of runoff weakened as slope gradient increased, and this weakening was mainly determined by the extent of transfer between rainfall volume and accumulation infiltration volume. Such findings were consistent with the research results of He et al [13]. Soil particle transfer from the slope is a dynamic development influenced by many factors such as runoff characteristics, soil characteristics, and slope characteristics.…”

Section: Discussionsupporting

confidence: 93%

“…Several studies have reported that the runoff coefficient was a function of slope gradient and rainfall intensity in different slope gradient cases [4,10,12]. The amount of total erosion tends to stabilize with an increase in slope gradients, which implies there is probably a threshold slope gradient at which soil erosion begins to shift from strong to weak [13]. Fu et al [14] found that the amount of wash load increased with an increasing slope gradient if the gradient was less than 58%; alternatively, the opposite relationship was observed at steeper slopes.…”

mentioning

confidence: 99%

“…Many studies were based on a discussion of critical slope or characteristics of P loss at the surface, but there is still insufficient data for P loss in subsurface runoff. The lack of experimental studies is due to the difficulty of monitoring variation in subsurface runoff [1,[10][11][12][13][14].…”

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confidence: 99%

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Effect of Slope Gradient on Phosphorus Loss from a Sloping Land of Purple Soil under Simulated Rainfall

He¹,

Zheng²,

Li³

et al. 2020

Pol. J. Environ. Stud.

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Slope farmland covers an area of 3,513 × 10 4 m 2 in China, which is a major source of soil and water losses. Soil erosion has been identified as one of the major processes contributing to soil and water quality degradation [1-4]. Recently, the application of excessive fertilizers and manures to agricultural land can increase the level of phosphorus (P) in the purple soil region of Sichuan, China. P is the element primarily responsible for water eutrophication. The loss of P with soil erosion can cause environmental problems due to their effect on water eutrophication [5]. P loss in the purple soil of sloped farmlands has caused much concern [6-9]. Thus, studies should consider P loss caused by runoff and sediments.

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Section: Discussionsupporting

confidence: 93%

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confidence: 99%

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Effect of Slope Gradient on Phosphorus Loss from a Sloping Land of Purple Soil under Simulated Rainfall

He¹,

Zheng²,

Li³

et al. 2020

Pol. J. Environ. Stud.

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“…As a result, runoff connectivity increases on a tilled surface during rainfall (Antoine, Javaux, & Bielders, ; Darboux, Gascuel‐Odoux, & Davy, ). He, Sun, Gong, Cai, and Jia () also found that increasing slope gradient could enhance rill headward erosion, vertical erosion, and fragmentation of the slope surface. Furthermore, total erosion tends to approach a stable maximum value with increasing slope gradient, which implies that there is probably a critical slope gradient where soil erosion begins to decline.…”

Section: Discussionmentioning

confidence: 99%

Exploring the interaction of surface roughness and slope gradient in controlling rates of soil loss from sloping farmland on the Loess Plateau of China

Zhao

Duan

et al. 2019

Hydrological Processes

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Surface roughness and slope gradient are two important factors influencing soil erosion. The objective of this study was to investigate the interaction of surface roughness and slope gradient in controlling soil loss from sloping farmland due to water erosion on the Loess Plateau, China. Following the surface features of sloping farmland in the plateau region, we manually prepared rough surfaces using four tillage practices (contour drilling, artificial digging, manual hoeing, and contour plowing), with a smooth surface as the control measure. Five slope gradients (3°, 5°, 10°, 15°, and 20°) and two rainfall intensities (60 and 90 mm/hr) were considered in the artificial rainfall simulation experiment. The results showed that the runoff volume and sediment yield increased with increasing slope gradient under the same tillage treatment. At gentle slope gradients (e.g., 3° and 5°), the increase in surface roughness prevented the runoff and sediment production, that is, the surface roughness reduced the positive effect of slope gradient on the runoff volume and sediment yield to a certain extent. At steep slope gradients, however, the enhancing effect of slope gradient on soil erosion gradually increased and surpassed the reduction effect of surface roughness. This study reveals the existence of a critical slope gradient that influences the interaction of surface roughness and slope gradient in controlling soil erosion on sloping farmland. If the slope gradient is equal to or less than the critical value, an increase in surface roughness would decrease soil erosion. Otherwise, the increase in surface roughness would be ineffective for preventing soil erosion. The critical slope gradient would be smaller under higher rainfall intensity. These findings are helpful for us to understand the process of soil erosion and relevant for supporting soil and water conservation in the Loess Plateau region of China.

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“…Rill erosion is one mechanism of soil loss by water on hillslopes (Govers, Giménez, & Oost, 2007;He, Sun, Gong, Cai, & Jia, 2016;Porto, Walling, & Capra, 2014;Xiao, Liu, Zheng, & Zhang, 2017). Rill erosion greatly affects run-off and soil loss occurring on slope surfaces (Fang, Sun, & Tang, 2015;Govers et al, 2007;Wirtz, Seeger, & Ries, 2012) and involves soil particle detachment, transport, and deposition (Nearing et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Modelling the sediment transport capacity of flows in steep nonerodible rills

Jiang

Gao

XiaoJing

et al. 2018

Hydrological Processes

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A precise estimation of sediment transport capacity (Tc) is key to establishing process‐based erosion models. However, few data are available for estimating transport capacity on steep slopes and test materials sorted at high coarse grain values of >2 mm. Colluvial deposits with loose, coarse material and steep slopes make up the packed materials underlying the collapsing walls in benggang, which collapse due to hydraulic pressure and gravity. The objectives of this study were to investigate how flow discharge and slope steepness affect Tc and to examine relationships between Tc and flow velocity, shear stress, stream power, and unit stream power for colluvial deposits found on steep slopes. A nonerodible rill flume of 4 m long and 0.12 m wide was used. Slope steepness values ranged from 18% to 84%, and unit flow discharge values ranged from 0.56 × 10−3 to 4.44 × 10−3 m2 s−1. Tc increased as a power function with flow discharge and slope steepness with a Nash–Sutcliffe model efficiency (NSE) value of 0.99, and the effects of flow discharge were stronger than those of slope steepness. Tc was overestimated for a colluvial deposit when the equations of the ANSWERS, Zhang et al. and Wu et al. models were considered and when Tc exceeded 5 kg m−1 s−1, as the slope steepness used in our study was much higher than those used (<47%) in the other models. Regression analyses show that Tc can be predicted from linear equations of flow velocity, stream power, and unit stream power, and Tc can be fit to shear stress with power function equation. Flow velocity optimizes to predict Tc with NSE = 0.97, and stream power and shear stress can also be successfully related to Tc (NSE = 0.91 and NSE = 0.81, respectively); however, unit stream power performs poorly (NSE = 0.67). These results provide a basis for establishing process‐based erosion models on steep colluvial slopes.

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The characteristics of rill development and their effects on runoff and sediment yield under different slope gradients

Abstract: Abstract:process in s study was characterist sediment y gradients a rainfall int setting. Res density ha gradient. T distance of negatively suggested enhance ril the fragmen total erosio value with i is probably erosion beg correlation connection

Cited by 35 publications

References 29 publications

Effect of Slope Gradient on Phosphorus Loss from a Sloping Land of Purple Soil under Simulated Rainfall

Effect of Slope Gradient on Phosphorus Loss from a Sloping Land of Purple Soil under Simulated Rainfall

Exploring the interaction of surface roughness and slope gradient in controlling rates of soil loss from sloping farmland on the Loess Plateau of China

Modelling the sediment transport capacity of flows in steep nonerodible rills

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