An empirical investigation of gully widening rates in upland concentrated flows

Wells, Robert R.; Momm, Henrique G.; Rigby, James R.; Bennett, Sean J.; Bingner, Ronald L.; Dabney, Seth M.

doi:10.1016/j.catena.2012.10.004

Cited by 85 publications

(58 citation statements)

References 21 publications

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“…The displayed incision illustrates a constant cutting into the substrate at a more or less 45° angle. This process is dependent on the erodibility of the material as a less erodible layer would cause lateral growth and reduce deepening [48]. Figure 14 demonstrates a possible final output of a SfM workflow.…”

Section: Discussionmentioning

confidence: 99%

“…No clear rill incision is evident but a circular hollow form of 25 m in diameter and 1.5 m in depth developed. Besides the weak inclination of the terrain, Wells et al (2013) [48] suggest another explanation contributing to the shape of GCH by connecting lower incision rates and thus widening to a less erodible soil layer. In rainfall simulations, measured sediment loads were low in comparison to other test sites in the research area, which can be explained by physical and biological soil crusts covering parts of GCH [24].…”

Section: Discussionmentioning

confidence: 99%

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Small-Scale Surface Reconstruction and Volume Calculation of Soil Erosion in Complex Moroccan Gully Morphology Using Structure from Motion

et al. 2014

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This study presents a computer vision application of the structure from motion (SfM) technique in three dimensional high resolution gully monitoring in southern Morocco. Due to impractical use of terrestrial Light Detection and Ranging (LiDAR) in difficult to access gully systems, the inexpensive SfM is a promising tool for analyzing and monitoring soil loss, gully head retreat and plunge pool development following heavy rain events. Objects with known dimensions were placed around the gully scenes for scaling purposes as a workaround for ground control point (GCP) placement. Additionally, the free scaling with objects was compared to terrestrial laser scanner (TLS) data in a field laboratory in Germany. Results of the latter showed discrepancies of 5.6% in volume difference for erosion and 1.7% for accumulation between SfM and TLS. In the Moroccan research area soil loss varied between 0.58 t in an 18.65 m

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Small-Scale Surface Reconstruction and Volume Calculation of Soil Erosion in Complex Moroccan Gully Morphology Using Structure from Motion

et al. 2014

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“…These determinations assume that the depth of erosion was achieved instantaneously or over a short period of time. In low intensity runoff events, rills and shallow gullies would likely erode gradually to shallow depths and produce sediment with an upland signature, while in high-intensity runoff events, thicker layers would likely be eroded especially if erosion occurs as headcuts or knickpoints in the gullies (Bennett et al 2000;Wells et al 2009Wells et al , 2013, resulting in more channel-like signatures. Studies of the eight watersheds indicate that gully processes were not important on most of the watersheds and thus fine sediment contributions from gullies for the measured storms were likely insignificant.…”

Section: Figurementioning

confidence: 99%

Fine sediment sources in Conservation Effects Assessment Project watersheds

Wilson¹,

Kuhnle²,

Dabney³

et al. 2014

Journal of Soil and Water Conservation

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“…Channel width has also been modeled by Wells et al, (2013) who found that both slope and discharge play a role in setting channel width. This relationship was tested for the results of these experiments, yet it was not as strong as the relationship with 5 discharge alone.…”

Section: Discussion 15mentioning

confidence: 99%

Impacts of Changing Hydrology on Ravine Growth: Experimental Results

Day

Gran

Paola

2017

Preprint

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Abstract. Ravines grow through head cut propagation in response to overland flow coupled with incision and widening in the channel bottom leading to hillslope failures. Altered hydrology can impact the rate at which ravines grow by changing headcut propagation, channel incision, and channel widening rates. Using a set of small physical experiments, we tested how 10 changing overland flow rates and flow volumes alter the total volume of erosion and resulting ravine morphology. Ravines were modeled as both detachment-limited and transport-limited systems, using two different substrates with varying cohesion.In both cases, the erosion rate varied linearly with water discharge, such that the volume of sediment eroded was a function not of flow rate, but of total water volume. This implies that efforts to reduce peak flow rates alone without addressing flow volumes entering ravine systems may not reduce erosion. The documented response in these experiments is not typical when 15 compared to larger pre-existing channels where higher flow rates result in greater erosion through non-linear relationships between water discharge and sediment discharge. Ravines do not respond like pre-existing channels because channel slope remains a free parameter and can adjust relatively quickly in response to changing flows.

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An empirical investigation of gully widening rates in upland concentrated flows

Cited by 85 publications

References 21 publications

Small-Scale Surface Reconstruction and Volume Calculation of Soil Erosion in Complex Moroccan Gully Morphology Using Structure from Motion

Small-Scale Surface Reconstruction and Volume Calculation of Soil Erosion in Complex Moroccan Gully Morphology Using Structure from Motion

Fine sediment sources in Conservation Effects Assessment Project watersheds

Impacts of Changing Hydrology on Ravine Growth: Experimental Results

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