Morpho-textural implications to bedload flux and texture in the sand-gravel ephemeral Poveda Gully

Zapico, Ignacio; Laronne, Jonathan B.; Lucía, Ana; Martín‐Duque, José F.

doi:10.1016/j.geomorph.2018.08.026

Cited by 9 publications

(9 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2.6 in the April flood) to drag and deposit the material transported from upstream. Such results corroborate the hypothesis that in this ephemetal gravel-bed stream, the events of greater magnitude (Qp ≥30 m 3 s −1 ) produce vertical sedimentary accretion on the bed [41], exceeding even the critical stress of the coarsest particles (gravel and pebbles) in PBSA (UPR) (mean ω/ω c >2) and thus moving a large bedload downstream. In contrast, more moderate peak flow rates (Qp ≤10 m 3 s −1 ) were only able to exert a surface washing action, selective transport, and local scouring.…”

Section: Sediment Budget and Stream Power In Pbsa Estimated From Tls Datasupporting

confidence: 85%

“…In addition, these stream stretches better represent the variations in the sediment budget and morphological adjustments within the main channel, as opposed to the lower reach, whose global changes are the product of sediment-laden flood water spills, affecting crevasse splays and a wide active flood bed. In fact, the choice of the upper and middle RCR in this ephemeral gravel-bed stream is intended to reflect the clear influence that coarse grain-sizes and bedload, as the dominant transport modality, have on the morphological sediment budget within the channel itself [41]. Downstream, along the lower reach to the mouth of this stream, a distributary drainage system exists, which implies that the budget of more complex sediments needs to be evaluated, accounting for mixed sources (hillslopes and secondary channels), for the temporary storage of sediment in bars and alluvial plains [42].…”

Section: Criteria For the Selection Of Reference Channel Reaches (Rcrs) Pilot Bed Survey Areas (Pbsas) And Representative Geomorphic Unitmentioning

confidence: 99%

See 1 more Smart Citation

Combining SfM Photogrammetry and Terrestrial Laser Scanning to Assess Event-Scale Sediment Budgets along a Gravel-Bed Ephemeral Stream

et al. 2020

View full text Add to dashboard Cite

Stream power represents the rate of energy expenditure along a stream reach and can be calculated using topographic data acquired via structure-from-motion (SfM) photogrammetry and terrestrial laser scanning (TLS). This study sought to quantitatively relate morphological adjustments in the Azohía Rambla, a gravel-bed ephemeral stream in southeastern Spain, to stream power (ω), critical power (ωc), and energy gradients (∂ω/∂s), along different reference channel reaches of 200 to 300 m in length. High-resolution digital terrain models (HRDTMs), combined with ortophotographs and point clouds from 2018, 2019, and 2020, and ground-based surveys, were used to estimate the spatial variability of morphological sediment budgets and to assess channel bed mobility during the study period at different spatial scales: reference channel reaches (RCRs), pilot bed survey areas (PBSAs), and representative geomorphic units (RGUs). The optimized complementary role of the SfM technique and terrestrial laser scanning allowed the generation of accurate and reliable HRDTMs, upon which a 1-D hydrodynamic model was calibrated and sediment budgets calculated. The resulting high-resolution maps allowed a spatially explicit analysis of stream power and transport efficiency in relation to volumes of erosion and deposition in the RCR and PBSA. In addition, net incision or downcutting and vertical sedimentary accretion were monitored for each flood event in relation to bedforms and hydraulic variables. Sediment sources and sinks and bed armoring processes showed different trends according to the critical energy and stream power gradient, which were verified from field observations. During flows exceeding bankfull discharges (between 18 and 24 m3s−1 according to channel reach), significant variations in ∂ω/∂s values and ω/ωc ratios (e.g., −15< ∂ω/∂s <15 Wm−3; ω/ωc >2 for a peak discharge of 31 m3s−1) were associated with a large amount of bedload mobilized upstream and vertical accretion along the middle reach (average rise height of 0.20 to 0.35 m for the same event). By contrast, more moderate peak flows (≤10 m3s−1) only produced minor changes resulting in surface washing, selective transport, and local bed scouring.

show abstract

Section: Sediment Budget and Stream Power In Pbsa Estimated From Tls Datasupporting

confidence: 85%

Section: Criteria For the Selection Of Reference Channel Reaches (Rcrs) Pilot Bed Survey Areas (Pbsas) And Representative Geomorphic Unitmentioning

confidence: 99%

Combining SfM Photogrammetry and Terrestrial Laser Scanning to Assess Event-Scale Sediment Budgets along a Gravel-Bed Ephemeral Stream

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Several authors have recognized the complexity of this gully armouring process. Some sites evolve to a coarser surface in a cyclic pattern due to different materials (Sawatsky & Beckstead, 1996;Zapico et al, 2018a). However, while observed, there is a paucity of field data on the amount (e.g.…”

Section: Lems the Next Generationmentioning

confidence: 99%

Predicting gully erosion using landform evolution models: Insights from mining landforms

Hancock

Willgoose

2021

Earth Surf Processes Landf

View full text Add to dashboard Cite

Incision as a result of fluvial erosion is an important process to model when simulating landform evolution. For gullies, it is apparent that coupled with the processes that cause incision there must be a range of processes that stop incision. Once started, rills and gullies will grow infinitely without a reduction in support area and/or being arrested by deposition and armouring. Some of these processes have been well studied under the heading of inter-rill erosion. Other limiting processes are related to the shape of the landform and how downstream deposition areas are linked geomorphically to the upstream gullies. Armouring is also an important process that reduces gully incision and extension, where the gully erodes to bedrock and the resistant base limits further development. Post-mining landscapes are new surfaces with new materials and provide the opportunity to examine gully initiation, extension and stabilization. The work presented here has largely been driven by the mining industry, where there has been a need to assess erosion over hazardous wastes like mine tailings and low-level nuclear waste. We demonstrate the usefulness of computer-based landscape evolution models and the more recent soilscape models (that include both surface and subsurface processes) to understand both fluvial and diffusive processes as well as armouring in a digital elevation model framework (as well as landscape evolution). Landscape evolution models provide insights into complex non-linear systems such as gullies. A key need is that of field data to parameterize and validate the models. It is argued that current models have more capability than field data available for parameterization and importantly the validation of model outputs.

show abstract

“…In addition, these stream stretches better represent the variations in the sediment budget and morphological adjustments within the main channel, as opposed to the lower reach, whose global changes are the product of sediment-laden flood water spills, affecting crevasse splays and a wide active flood bed. In fact, the choice of the Upper and Middle RCR in this EGBS is intended to reflect the clear influence that coarse grain-sizes and bedload, as the dominant transport modality, have on the morphological sediment budget within the channel itself (Zapico et al, 2018). Downstream, along the lower reach to the mouth of this stream, a distributary drainage system exists, which implies that the budget of more complex sediments needs to be evaluated, accounting for mixed sources (hillslopes and secondary channels), for the temporary storage of sediment in bars and alluvial plains (Ali and De Boer, 2003).…”

Section: Terrestrial Laser Scanning (Tls)mentioning

confidence: 99%

“…Especially in the upper reach, isolated groups of blocks deposited by recent collapses or exhumed ancient boulders disturb the flow regime and alter the total sediment flux over short distances. Zapico et al (2018) analyzed this type of relationship in a steep, sand-gravel ephemeral channel and found, by contrast, a clear relationship between the variation in bedload flux, texture, and total bedload yield (measured directly in the field) and changes in channel shape and bed texture (derived from topographic surveys using SfM and TLS).…”

Section: Sediment Budgets and Fluxes Versus Stream Powermentioning

confidence: 99%

Remote Sensing and UAVs for the Geomorphological and Habitat Analysis in Ephemeral and Permanent Mediterranean Streams

Mengual¹,

Antonio²

View full text Add to dashboard Cite

show abstract

Morpho-textural implications to bedload flux and texture in the sand-gravel ephemeral Poveda Gully

Cited by 9 publications

References 68 publications

Combining SfM Photogrammetry and Terrestrial Laser Scanning to Assess Event-Scale Sediment Budgets along a Gravel-Bed Ephemeral Stream

Combining SfM Photogrammetry and Terrestrial Laser Scanning to Assess Event-Scale Sediment Budgets along a Gravel-Bed Ephemeral Stream

Predicting gully erosion using landform evolution models: Insights from mining landforms

Remote Sensing and UAVs for the Geomorphological and Habitat Analysis in Ephemeral and Permanent Mediterranean Streams

Contact Info

Product

Resources

About