Downslope runoff and erosion response of typical engineered landform to variable inflow rate patterns from upslope

Zhang, L. T.; Gao, Zhifeng; Li, Z. B.; Hongwei, Tian

doi:10.1007/s11069-015-1996-z

Cited by 20 publications

(11 citation statements)

References 22 publications

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“…Raindrop kinetic energy [9] Review of laboratory and field studies Inter-rill erosion Rain kinetic energy and flow stresses [30] Field tests on spoil deposit Rill erosion Concentrated flow shear stresses [24] Water erosion model on slopes Gully erosion Concentrated flow shear stresses [17] Modelling social cost of soil erosion…”

Section: Splash Erosionmentioning

confidence: 99%

Factors Affecting Erosion in Unpaved Roads

Ngezahayo¹,

Ghataora²,

Burrow³

2019

World Congress on Civil, Structural, and Environmental Engineering

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More than 90% of the road network in developing countries is unpaved and comprises of either gravel or earth roads. Such roads are prone to erosion leading to the formation of potholes, rills and gullies. Many studies have been undertaken on soil erosion, but only a few are focussed on earth roads. A systematic analysis of research on erosion of soils in earth roads was undertaken to draw out lessons that can be learnt. 564 studies were assessed. Of these only 85 were relevant to earth roads. Most significant erosion driver was rain. In addition to rainfall duration and intensity, findings were that the key factors that affected soil erosion in earth roads were soil type, clay content, soil plasticity, particle size distribution and degree of the surface layer compaction as well as traffic loading and speed.

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Section: Splash Erosionmentioning

confidence: 99%

Factors Affecting Erosion in Unpaved Roads

Ngezahayo¹,

Ghataora²,

Burrow³

2019

World Congress on Civil, Structural, and Environmental Engineering

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“…Rainfall kinetic energy and flow shear stresses [30] Rill erosion Concentrated flow shear stresses [24] Gully erosion Concentrated flow shear stresses [17]…”

Section: Sheet Erosionmentioning

confidence: 99%

The Advances in Understanding Erodibility of Soils in Unpaved Roads

Ngezahayo¹,

Burrow²,

Ghataora³

2019

IJCI

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More than 90% of the road network in rural areas of the developing countries is unpaved and comprises of either gravel or earth roads. Such roads are prone to erosion leading to the formation of potholes, rills and gullies. Many studies have been undertaken on soil erosion, but only a few are focussed on earth roads. A systematic analysis of research on erosion of soils in earth roads was undertaken to draw out lessons that can be learnt. 564 studies were assessed. Of these only 85 were relevant to earth roads. Most significant erosion driver was total rain, rainfall duration and intensity. Further findings were that the key factors that affected soil erosion in earth roads were soil type, clay content, soil plasticity, and particle size distribution; degree of the surface layer compaction, and traffic loading and speed. To challenge and validate the findings of the literature, the main factors affecting erosion were controlled during laboratory erodibility tests of a sand soil mixed with its 0%, 5%, 10%, 15% and 20% china clay and of a granular subbase material. The soils were compacted at their maximum dry densities and subjected to a simulated rainfall intensity of 30mm/hr for 30 minutes, and at 0% and 6% slopes. Interestingly, laboratory results agreed with the literature. Erodibility increased with increase in rainfall duration and slope gradient. In sand -china clay mixes, erodibility reduced with increased clay content. An increment of 5% china clay corresponded to a reduction of eroded sediment of about 8% to 12%. The subbase soil material was very less erodible due to its robust particle size that resisted detachment due to rain drops. Moreover, it was observed that most soils were detached and eroded within the first 15 minutes of the rainfall after which detachment reduces.

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“…Spoil tips, as a special type of artificial landform, consists of a platform and a steep slope (Fig. 2), the platform being the main area where runoff collects and the slope being the main source of eroded sediment (Zhang et al, 2016). Therefore, this paper uses field scouring experiments to simulate the rill erosion of slopes by collected runoff from platforms.…”

Section: Experimental Designmentioning

confidence: 99%

Rill Erosion on Slope of Spoil tips: experimental study of runoff scouring erosion in multiple times

Lou

Gao

Zhou

et al. 2021

Preprint

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Abstract. The soil erosion of the spoil tips seriously threatens the safety of people's lives and property and the surrounding ecological environment. Rill erosion is an important cause of water and soil loss in spoil tips. This study was conducted to investigate the process of rill erosion on the slopes of spoil tips, changes in the morphological characteristics of rills and the mechanisms of rill erosion. A Field runoff plot (5 m long, 1 m wide and 0.5 m deep) with three inflow rates (1.6, 2 and 2.4 mm min−1) and three typical slopes (28°, 32° and 36°) was used for runoff simulation experiments. The results showed that, compared with the slope and scouring times, inflow rate was the most important factor affecting rill erosion of the spoil tips. The development of rill mainly goes through three stages: the rill formation stage, the rill development stage and the rill adjustment stage. The overall predominance of parallel-shaped rills at all experiments suggested that the formation of rills was dominated by concentrated runoff. The average rill depth was the best indicator of rill morphology for evaluating rill erosion. The flow regimes under the experimental conditions were supercritical-laminar flow and supercritical-transition flow. The Reynolds number was the best hydraulic parameter for predicting rill erosion. The stream power was the best hydrodynamic parameter to describe rill erosion mechanism. These results contributed to further revealing the rill erosion mechanism on the slope of the spoil tips and provided a scientific basis for its soil erosion control.

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Downslope runoff and erosion response of typical engineered landform to variable inflow rate patterns from upslope

Cited by 20 publications

References 22 publications

Factors Affecting Erosion in Unpaved Roads

Factors Affecting Erosion in Unpaved Roads

The Advances in Understanding Erodibility of Soils in Unpaved Roads

Rill Erosion on Slope of Spoil tips: experimental study of runoff scouring erosion in multiple times

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