A rational method for estimating erodibility and critical shear stress of an eroding rill

Lei, Tingwu; Zhang, Q.W.; Yan, Lijuan; Jing, Zhao; Pan, Y. H.

doi:10.1016/j.geoderma.2008.01.015

Cited by 34 publications

(21 citation statements)

References 12 publications

(17 reference statements)

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“…(3)-(5)) detachment was not limited. Similar relationships were found by Ciampalini and Torri (1998), Knapen et al (2007), Lei et al (2008) and Zhu et al (2001). The contrasting results of Eqs.…”

Section: Rainfall Simulationssupporting

confidence: 80%

Conservation tillage practices in the alpine forelands of Austria — Are they effective?

Hösl

Strauß

2016

CATENA

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If it comes to the advantages of conservation tillage practices, a considerable amount of evidence supports positive effects towards reduction of surface runoff and soil erosion. However studies concerning arable land frequently are conducted under ideal laboratory conditions or "controlled" field conditions, meaning that the experimental approaches were not managed by farmers in the way they usually perform conservation tillage but managed towards an optimisation of the tested features. In addition, applicability of different existing conservation tillage techniques such as no tillage or mulching may be regionally different. The alpine forelands of Central Europe are dominated by small scale farming systems which frequently have limited access to special machinery which is needed to successfully implement no tillage treatments. We therefore carried out rainfall simulation experiments employing conservation tillage practices to test the effectiveness of actual real life conservation tillage methods under conditions prevailing in the alpine forelands of Central Europe. Experiments were carried out in the years 2011 and 2012 for testing the relative performance of different mulching and no tillage treatments on surface runoff and erosion. The tested treatments for the year 2011 were a) no tillage with prior rough seedbed (NT1), b) no tillage with prior fine seedbed (NT2), c) mulching with rotary harrow (M1), d) mulching with rotary harrow and disc harrow (M2) and e) conventional tillage (CT11). The tested treatments for the year 2012 were a) combined mulching (MC), b) mulching with loosened wheel tracks (M−T), c) mulching without loosened wheel tracks (M+T) and d) conventional tillage (CT12). In 2011, total surface runoff and total soil loss for the different treatments were ordered as follows: NT1 b NT2 b CT11 b M1 b M2. No significant differences for total soil loss could be identified. For total surface runoff differences were significant (p b 0.05) between all treatments, except for NT2 and CT11. The treatments also differed with respect to runoff initiation, sediment concentrations and shear stress. As a main reason for the unexpected bad performance of the mulching treatments M1 and M2 lack of sufficient soil cover (M1: 6%, M2: 11%) together with shallow surface cultivation were identified. In 2012, total surface runoff and total soil loss for the different treatments were ordered as follows: MC b M−T b CT12 b M+T. Although there were a visible trend in these results, significant differences could only be observed for total surface runoff between treatments MC and M+T (p b 0.05). We attribute the good performance of treatment MC to the improved soil cover (25%). Wheel tracks of treatment M+T obviously had influenced soil erosion and surface runoff. Under real life conditions of agricultural conservation practices in small scale farming systems, a sufficient soil cover was not obtained for mulching treatments in 2011 and only partially in 2012. In contrast to the vast majority of literature that stresses the p...

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Section: Rainfall Simulationssupporting

confidence: 80%

Conservation tillage practices in the alpine forelands of Austria — Are they effective?

Hösl

Strauß

2016

CATENA

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“…A rational method for determining the soil erodibility and critical shear stress of rill erosion under concentrated flow was advanced by Lei et al (2008). Using their method, soil erodibility of a loess soil was determined to be 0.3211 ± 0.0005 kg N − 1 s − 1 , and the critical shear stresses τ c were found to increase with slope gradient, i.e., τ c was 3.191 N m − 2 , 3.960 N m − 2 , 4.130 N m − 2 , 4.385 N m − 2 , 4.565 N m − 2 for slopes of 5°, 10°, 15°, 20°, and 25°respectively.…”

Section: Rill Erodibilitymentioning

confidence: 99%

“…The simulated sediment concentrations along rills, under different slope and flow rate conditions with parameter sets including transport capacity, rill erodibility and critical shear stress estimated by Lei et al (2001Lei et al ( , 2008, were compared with the experimental data collected under the same conditions, as shown by the Rational T c and K r line in Fig. 1a-m.…”

Section: Comparison Of Simulated Rill Erosion Processes With Experimementioning

confidence: 99%

“…These results imply that the simulation model, including the mathematical formulations and the numerical algorithms of the Finite Element method, as well as the computational procedure codes, were correct. Moreover, the model parameters set, including the transport capacity, rill erodibility, and the critical shear stress estimated by Lei et al (2001Lei et al ( , 2008, must likewise be correct in order to produce such good predictions of sediment yields not only at the rill outlets but also at the various locations along the rills.…”

Section: Comparison Of Simulated Rill Erosion Processes With Experimementioning

confidence: 99%

“…(9) reported by Lei et al, (1998) and the rill erodibility and critical shear stress estimated by Lei et al (2008), to check the impacts of this parameter on the rill sedimentation processes. The results are indicated by the T c -Limited curves in Fig.…”

Section: Impacts Of Transport Capacity On Rill Erosion Processesmentioning

confidence: 99%

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Effects of transport capacity and erodibility on rill erosion processes: A model study using the Finite Element method

Yan

Lei

et al. 2008

Geoderma

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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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A rational method for estimating erodibility and critical shear stress of an eroding rill

Cited by 34 publications

References 12 publications

Conservation tillage practices in the alpine forelands of Austria — Are they effective?

Conservation tillage practices in the alpine forelands of Austria — Are they effective?

Effects of transport capacity and erodibility on rill erosion processes: A model study using the Finite Element method

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

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