Scale effects on the estimation of erosion thresholds through a distributed and physically-based hydrological model

Millares, Agustín; Gulliver, Zacarías; Polo, María José

doi:10.1016/j.geomorph.2012.02.016

Cited by 32 publications

(14 citation statements)

References 47 publications

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“…The southern side of the basin belongs to the Sierra de la Contraviesa, with erosive rates of higher than 200 t·ha −1 ·year −1 based on the estimates made using RUSLE (Dirección General de Medio Natural y Política Forestal, ; Vázquez, ). This area shows frequent gully formation and mass movement as previously reported (Millares, Gulliver, & Polo, ). Nearby, the Sierra de Lújar, which is characterized by limestone geology and riverbed of rocky nature, has poorly developed soils because of recurrent wildfires.…”

Section: Study Sitesupporting

confidence: 84%

Sediment yield and transport process assessment from reservoir monitoring in a semi‐arid mountainous river

Millares

Moñino

2018

Hydrological Processes

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Soil loss, fluvial erosion, and sedimentation are major problems in semi‐arid environments due to the high associated costs of decreasing services such as provisioning and regulating water resources. The objective of this research is to analyse sediment yield in a mountainous semi‐arid basin, paying special attention to the sources of sediment, the associated uncertainties, and the transport processes involved. The segregation hypothesis along a reservoir of the sediment coming from hillslopes or fluvial systems is also evaluated. For this purpose, bottom‐set and deltaic deposits of a reservoir (110 hm3) in southern Spain have been measured and compared with basin erosion and fluvial transport monitoring over a 12‐year period. The volume of sediment stored at the bottomset of the reservoir shows a relative match with parametric predictions based on the Revised Universal Soil Loss Equation/Modified Universal Soil Loss Equation hillslope models and rating curves, estimated as being between 7 and 13 t·ha−1·year−1. Similarly, the measured volume of deltaic deposit fits the average value of stochastic simulations from different bedload transport equations. These contributions represent 50–65% of the total volume measured regarding suspended sediment inputs, way above that described in previous works. This highlights the importance of considering bedload when estimating the useful life of reservoirs in semi‐arid environments. The major differences in sediment grain size between hillslopes and river systems, and the size fractions measured along the reservoir, support the assertion of segregation hypothesis. Nonetheless, based on the processes observed and the uncertainty related to modelling, that assertion has to be taken with caution. At basin scale, a specific sediment yield of between 19 and 24 t·ha−1·year−1 has been estimated, which includes hillslopes and fluvial contributions. This rate is in the range of sediment yield reported for Mediterranean mountain areas of a torrential character. The pulse‐like nature of the system and the spatial heterogeneity of fluvial and hillslope erosion rates points out the importance of considering mid to long‐term and process‐based approaches and emphasizes the limitations of annual estimations for management purposes.

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Section: Study Sitesupporting

confidence: 84%

Sediment yield and transport process assessment from reservoir monitoring in a semi‐arid mountainous river

Millares

Moñino

2018

Hydrological Processes

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“…Some authors have used this model to predict rill and gully location at watershed scales (e.g., Daggupati, Douglas-Mankin, and Sheshukov (2013), Dewitte, Daoudi, Bosco, and Van Den Eeckhaut (2015) and Millares, Gulliver, and Polo (2012)). With the advent of low-cost three-dimensional reconstruction technologies and the improvement in the degree of autonomy of Unmanned Aerial Vehicles, one can expect high-resolution topographic data to be increasingly available to accommodate the topographic thresholdbased modeling approach.…”

Section: Initiation and Spatial Distribution Of Concentrated Flowpathsmentioning

confidence: 99%

A review of concentrated flow erosion processes on rangelands: Fundamental understanding and knowledge gaps

Nouwakpo

Williams

Al‐Hamdan

et al. 2016

International Soil and Water Conservation Research

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“…Although they also found that in the identification of the channel threshold, the 10 m DTM was equally effective as the smaller pixel DTMs, Millares et al . () found that a 30 m pixel DTM failed to identify the various regions on the plot and channel heads, and also advocated as small a resolution as possible for points in the slope region (I). Miccoli et al .…”

Section: Methodsmentioning

confidence: 97%

The use of the slope–area function to analyse process domains in complex badland landscapes

Vergari

Troiani

Faulkner

et al. 2018

Earth Surf Processes Landf

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This paper explores the effectiveness of the widely‐used functional relationship between drainage area (A in m2) and slope (S in m/m) to identify local process domains and aid interpretation of process interactions in a complex badland landscape. In order to perform this investigation, a series of sub‐basins tributary to the Formone River in the Orcia catchment (central Italy) were selected as a suitable study area within which to explore our questions, given these basins' general representativeness of local terrain, the availability of a high resolution digital terrain model and previous extensive geomorphological research. Eroding basins containing both calanchi and landslides are common in the sub‐humid badland landscape of central Italy, where field observation identifies a complex pattern of erosive processes associated with a history of uplift, despite which parts of the local landscape appear disconnected. Results reveal that the shape of all S–A curves (plotted using S data binned on log A) is comparable with that described in the literature, although sub‐basins containing calanchi generally plot with higher S values than non‐calanchi ones, except in the ‘fluvial’ section of the plots. Second, when viewed on total data (non‐binned) S–A plots, landslide source area domains and calanchi domains are entirely coincident in all basins, supporting a cause–effect relationship. Additional plotting of the frequency characteristics of the raw data in a new way supports the interpretation that calanchi frequently initiate in landslide scars. In general though, although the S–A plots can contribute to the disentanglement of geomorphological behaviour in some complex erosional landscapes, it became apparent that in this landscape, process domains do not separate out with clarity along the A axis as suggested by theory. Despite this, an alternative, broader‐scale morphoevolutive model can be proposed for the development of within‐landslide calanchi, driven by changes to basin connectivity to the base channel. © 2018 John Wiley & Sons, Ltd.

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Scale effects on the estimation of erosion thresholds through a distributed and physically-based hydrological model

Cited by 32 publications

References 47 publications

Sediment yield and transport process assessment from reservoir monitoring in a semi‐arid mountainous river

Sediment yield and transport process assessment from reservoir monitoring in a semi‐arid mountainous river

A review of concentrated flow erosion processes on rangelands: Fundamental understanding and knowledge gaps

The use of the slope–area function to analyse process domains in complex badland landscapes

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