Characteristics of Actively Eroding Ephemeral Gullies in an Experimental Channel

Bennett, Sean J.; Casalí, Javier; Robinson, K. M.; Kadavy, Kem C.

doi:10.13031/2013.2745

Cited by 97 publications

(61 citation statements)

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“…This suggests that detachment is active between upslope and midslope, while downslope positions are efficient in transporting the eroded sediment. The results are comparable with other studies available in literature (Bennett et al, 2000;Cochrane and Flanagan, 1997;Lei et al, 2001;Merten et al, 2001). Cochrane and Flanagan (1997) found that detachment decreases with the introduction of sediment at the top of the rill.…”

Section: K E Seutloali and H R Beckedahl: Understanding The Factosupporting

confidence: 92%

“…The dimensions of rills that extended continuously from the top to the bottom of the roadcuts changed significantly downslope. Previous research has indicated that significant changes in rill dimensions are determined by soil detachment and deposition along the length of the rill (Bennett et al, 2000;Lei and Nearing, 1998). In this study, a decrease in rill depth downslope suggests that a progressive increase in sediment load downslope decreases detachment rate (Lei and Nearing, 1998).…”

Section: K E Seutloali and H R Beckedahl: Understanding The Factomentioning

confidence: 47%

“…Cochrane and Flanagan (1997) found that detachment decreases with the introduction of sediment at the top of the rill. Additionally, Bennett et al (2000) observed that bed degradation was high in the upslope section of the channel, while Merten et al (2001) reported a decrease in detachment, with an increase in sediment load along the channel length due to the suspended bed load that reduced the detachment capacity. In this study, a decrease in rill width downslope implies that the scouring of the rill side walls decreased as a result of the limited scouring capacity of flow, due to increase in the sediment load downslope (Bewket and Sterk, 2003).…”

Section: K E Seutloali and H R Beckedahl: Understanding The Factomentioning

confidence: 99%

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Understanding the factors influencing rill erosion on roadcuts in the south eastern region of South Africa

Seutloali

Beckedahl

2015

Solid Earth

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Abstract. Erosion on roadcuts is a concern due to the potential of causing environmental degradation, which has significant economic costs. It is therefore critical to understand the relationship between roadcut characteristics and soil erosion for designing roadcuts that are less vulnerable to erosion and to help road rehabilitation works. This study investigated the characteristics (i.e. gradient, length, percentage of vegetation cover and soil texture) of degraded (i.e. with rills) and non-degraded roadcuts (i.e. without rills) and explored the relationship of the roadcut characteristics with the dimensions (widths and depths) of the rills. Degraded roadcuts were steep (52.21 • ), long (10.70 m) and had a low percentage of vegetation cover (24.12) when compared to non-degraded roadcuts which had a gradient of 28.24 • , length of 6.38 m and 91.7 % of vegetation cover. Moreover, the gradient and percentage of vegetation cover of the roadcut significantly determine the rill dimensions. The widths and depths of the rills increase with the increase in slope gradient and decrease with an increase in percentage of vegetation cover. Moreover, the widths and depths of the rills decreased downslope of the roadcuts. Based on these results, re-vegetation of roadcuts as well as construction of gentle gradients could minimise rill erosion and hence the negative on-site and off-site effects.

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Section: K E Seutloali and H R Beckedahl: Understanding The Factosupporting

confidence: 92%

Section: K E Seutloali and H R Beckedahl: Understanding The Factomentioning

confidence: 47%

Section: K E Seutloali and H R Beckedahl: Understanding The Factomentioning

confidence: 99%

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Understanding the factors influencing rill erosion on roadcuts in the south eastern region of South Africa

Seutloali

Beckedahl

2015

Solid Earth

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“…This is ap proximately the same magnitude as that of sheet erosion, and has thus far not been ac counted for in any hazard analysis. Bennett et al (2000) presented estimates for the percentage of total soil loss from agricultural watersheds due to ephemeral gullies ranging from 20 to 100%. While there is currently no method in the Czech Republic for identifying and predicting the occurrence of sediment delivery from this type of erosion, it needs to be seriously considered, due to its share of the total erosion rate.…”

Section: Sheet and Ephemeral Gully Erosionmentioning

confidence: 99%

Assessing the combined hazards of drought, soil erosion and local flooding on agricultural land: a Czech case study

Trnka¹,

Semerádová²,

Novotný³

et al. 2016

Clim. Res.

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Present-day agriculture faces multiple challenges, including ongoing climate change that is at many locations combined with soil degradation. The deterioration of soil properties through unsustainable agricultural practices and changing climate could lead to a fall in productivity beyond the point of no return with devastating effects on ecosystem services in large areas. Identifying areas with the highest hazard levels should therefore be a top priority. The key hazards for agricultural land in the Czech Republic considered in this study include the occurrence of water stress in the topsoil layer during both the first and second half of the growing season, the proportion of fast-drying soils, the risk of sheet and ephemeral gully erosion and the risk of local floods originating primarily from agricultural land. The results clearly marked regions where primary attention should be given to reduce the level of the hazards and/or to increase cropping capacity. These regions were found to be concentrated in the southeastern and northwestern lowland areas. Typical areas with the highest hazard levels were identified: regions with low precipitation and a high proportion of soils with a degraded or naturally occurring low water-holding capacity, and those with steeper than average slopes and terrain configurations in relatively large catchment areas that have urbanized countryside landscapes located at their lower elevations. Despite some limitations, the methods presented in this paper can be applied generally as the first step in developing strategies for efficient reduction of hazard levels.

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“…Leopold and Maddock, 1953;Leopold and Miller, 1956;Thornes, 1970Thornes, , 1974Graf, 1971;Hamlin and Thornes, 1974;Gilley et al, 1990;Govers, 1992;Foster et al, 1984;Abrahams et al, 1996;Di Stefano et al, 2013) and simulated experiments under controlled laboratory conditions (e.g. Lane and Foster, 1980;Foster et al, 1984;Sidorchuk, 1998;Bennett et al, 2000;Giménez and Govers, 2001). These equations are used as general modelling tools of channel hydraulic characteristics, and some researchers have used them for small ephemeral channels studies during storm flow events (Rendell and Alexander, 1979;Di Stefano et al, 2013).…”

Section: Hydraulic Characterization Of the Gullymentioning

confidence: 99%

Morphometric and hydraulic geometry assessment of a gully in SW Spain

et al. 2016

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Characteristics of Actively Eroding Ephemeral Gullies in an Experimental Channel

Cited by 97 publications

References 0 publications

Understanding the factors influencing rill erosion on roadcuts in the south eastern region of South Africa

Understanding the factors influencing rill erosion on roadcuts in the south eastern region of South Africa

Assessing the combined hazards of drought, soil erosion and local flooding on agricultural land: a Czech case study

Morphometric and hydraulic geometry assessment of a gully in SW Spain

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