Erosion processes in black marl soils at the millimetre scale: preliminary insights from an analogous model

Bechet, J.; Duc, J.; Jaboyedoff, Michel; Loye, A.; Mathys, Nicolle

doi:10.5194/hess-19-1849-2015

Cited by 7 publications

(10 citation statements)

References 16 publications

(23 reference statements)

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“…The value of eroded volumes based on the sediment trap is increased by 20 % to include the suspended sediments; otherwise the true erosion rates are un-derestimated. In addition, although the swelling or inflation of the regolith surface (Bechet et al, 2015) can have an influence on the georeferencing, it was not possible to quantify it at the level of the Roubine catchment. Nevertheless, it has been shown that the unweathered black marl density is 2650 kg m −3 , while the regolith density can be as small as 1300 kg m −3 , but it varies greatly in space and time according to the presence of local discontinuities (Maquaire et al, 2003;Travelletti et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

“…First, the vegetated areas are deleted from the raw point clouds in order to keep only the bare soil surface for the analysis. The scans of each campaign are then aligned using the iterative closest point (ICP) procedure (Chen and Medioni, 1992;Besl and McKay, 1992) to obtain a point cloud of the entire catchment. The TLS campaigns are aligned to a reference campaign (e.g.…”

Section: Data Acquisition and Processingmentioning

confidence: 99%

“…The accumulated material in the rills can be mobilized by moderate rainfall intensities for fine material, while inter-rills need intense precipitation and/or a well-developed upper part of the regolith. In winter, the upper regolith probably only moves a short distance on a centimetre scale by small mass movements (Bechet et al, 2015) and on a metre scale by MDFs. In spring, the material accumulated in the rill is washed away, and later the inter-rills and rills with small contributing areas can be eroded and the material transported outside the catchment.…”

Section: Conceptual Modelmentioning

confidence: 99%

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Detection of seasonal cycles of erosion processes in a black marl gully from a time series of high-resolution digital elevation models (DEMs)

et al. 2016

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Abstract. The Roubine catchment located in the experimental research station of Draix-Bléone (south French Alps) is situated in Callovo-Oxfordian black marls, a lithology particularly prone to erosion and weathering processes. For 30 years, this small watershed (0.13 ha) has been monitored for analysing hillslope processes on the scale of elementary gullies. Since 2007, surface changes have been monitored by comparing high-resolution digital elevation models (HRDEMs) produced from terrestrial laser scanner (TLS). The objectives are (1) to detect and (2) to quantify the sediment production and the evolution of the gully morphology in terms of sediment availability/transport capacity vs. rainfall and runoff generation. Time series of TLS observations have been acquired periodically based on the seasonal runoff activity with a very high point cloud density ensuring a resolution of the digital elevation model (DEM) on the centimetre scale. The topographic changes over a time span of 2 years are analysed. Quantitative analyses of the seasonal erosion activity and of the sediment fluxes show and confirm that during winter, loose regolith is created by mechanical weathering, and it is eroded and accumulates in the rills and gullies. Because of limited rainfall intensity in spring, part of the material is transported in the main gullies, which are assumed to be a transport-limited erosion system. In the late spring and summer the rainfall intensities increase, allowing the regolith, weathered and accumulated in the gullies and rills during the earlier seasons, to be washed out. Later in the year the catchment acts as a sediment-limited system because no more loose regolith is available. One interesting result is the fact that in the gullies the erosion–deposition processes are more active around the slope angle value of 35°, which probably indicates a behaviour close to dry granular material. It is also observed that there exist thresholds for the rainfall events that are able to trigger significant erosion; they are above 9 mm rainfall or of an intensity of more than 1 mm min−1, values which can vary if antecedent precipitation is significant within the last 5 days.This study improves knowledge of the spatial distribution of erosion seasonality in badlands and demonstrates the potential of careful 3-D high-resolution topography using TLS to improve the understanding of erosive processes.

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Section: Discussionmentioning

confidence: 99%

Section: Data Acquisition and Processingmentioning

confidence: 99%

Section: Conceptual Modelmentioning

confidence: 99%

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Detection of seasonal cycles of erosion processes in a black marl gully from a time series of high-resolution digital elevation models (DEMs)

et al. 2016

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“…Similarly, Portillo-Quintero et al (2014) used an ATLS to map daily changes in Plant Area Index (PAI) for a period of 22 days during leaf drop in a Boreal-Mixed forest. To study dynamic changes in soil microtopography under changing weather conditions, Bechet et al (2015) tracked rainfall simulation induced microtopographic changes with hypertemporal lidar. For monitoring snowpack dynamics and snow avalanches, Adams et al (2013) acquired lidar data with an ATLS of a mountainside in the Austrian Alps twice per day for a period of five months (February 5 th 2013 to June 6 th 2013).…”

Section: Hypertemporal Lidarmentioning

confidence: 99%

Beyond 3-D: The new spectrum of lidar applications for earth and ecological sciences

Eitel

Höfle

Vierling

et al. 2016

Remote Sensing of Environment

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175

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Capturing and quantifying the world in three dimensions (x,y,z) using light detection and ranging (lidar) technology drives fundamental advances in the Earth and Ecological Sciences (EES). However, additional lidar dimensions offer the possibility to transcend basic 3-D mapping capabilities, including i) the physical time (t) dimension from repeat lidar acquisition and ii) laser return intensity (LRI λ ) data

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“…The results showed that the geomorphology of badlands has been extensively studied for the last 30 years, using numerous methods to understand geomorphological dynamics (erosion and deposition processes) and quantify erosion rates. The authors emphasized that from 2007 there has been a sharp increase in topographic data measurements for geomorphic research (Nadal-Romero et al, 2015), and new developments and non-invasive tools have focused on constructing Digital Elevation Models (DEMs) or Digital Terrain Models (DTMs): Structure from Motion photogrammetry (SfM) (Gómez-Gutiérrez et al, 2014Castillo et al, 2015;Smith and Vericat, 2015), Terrestrial Laser Scanner (TLS) (Vericat et al, 2014;Bechet et al, 2015), or aerial SfM using Unnamed Aerial Vehicles (UAVs) (D´Oleire-Oltmanns et al, 2012;Neugirg et al, 2016b). These new technologies have provided a set of tools that are dramatically increasing spatial resolution and allowing new kinds of data analysis.…”

Section: Introductionmentioning

confidence: 99%

A multiscale approach to assess geomorphological processes in a semiarid badland area (Ebro Depression, Spain)

Sánchez

Abad

Alonso‐González

et al. 2017

CIG

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In this paper, three methods (Terrestrial Laser Scanner (TLS), terrestrial Structure from Motion photogrammetry (SfM) and aerial SfM photogrammetry with an Unmanned Aerial Vehicle (UAV)) were evaluated and compared to produce high resolution point clouds and Digital Elevation Models (DEMs) in a semiarid, complex badland area (Los Aguarales) with tourism activities. Geomorphological processes and dynamics were studied at different spatial scales. The preliminary results showed the possibilities of a multiscale approach, using various non-invasive techniques, to assess geomorphological processes. The high resolution of the point clouds, obtained with TLS and terrestrial SfM photogrammetry, allowed preliminary identification of numerous spatial details, although no relevant topographical changes were detected during a short, wet spring period (with rainfall of 200 mm). UAV images allowed work at larger scales (catchment), mapping piping features, and could be seen as a worthwhile tool for time-effective data acquisition from larger areas. The application of different technologies and a multiscale approach to generate high resolution DEMs is a useful technique when carrying out geomorphological studies in semiarid badland areas. However, long term studies will be necessary to verify the suitability of these techniques in such complex landscapes, and quantify topographical changes and erosion rates. Finally, the information obtained with these tools could be used to promote the study area as an interesting geomorphosite with opportunities for tourism.

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Erosion processes in black marl soils at the millimetre scale: preliminary insights from an analogous model

Cited by 7 publications

References 16 publications

Detection of seasonal cycles of erosion processes in a black marl gully from a time series of high-resolution digital elevation models (DEMs)

Detection of seasonal cycles of erosion processes in a black marl gully from a time series of high-resolution digital elevation models (DEMs)

Beyond 3-D: The new spectrum of lidar applications for earth and ecological sciences

A multiscale approach to assess geomorphological processes in a semiarid badland area (Ebro Depression, Spain)

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