Effects of slope gradient on hydro-erosional processes on an aeolian sand-covered loess slope under simulated rainfall

Zhang, Fengbao; Yang, Mingyi; Li, B.B.; Li, Z.B.; Shi, Weiyu

doi:10.1016/j.jhydrol.2017.08.019

Cited by 36 publications

(17 citation statements)

References 34 publications

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“…There are also some other studies demonstrated that the sand layer on the loess slopes could significantly influence the processes and mechanisms of runoff and sediment generation (Xu et al, 2015;Zhang et al, 2017a). The sand cover on loess slopes may destroy the stability of the water flow, further aggravating soil erosion of loess slopes (Zhang et al, 2017b).…”

Section: Influences Of Sand Cover Amount On Erosion Processes Of Loesmentioning

confidence: 99%

Influences of sand cover on erosion processes of loess slopes based on rainfall simulation experiments

Zhang

et al. 2018

J. Arid Land

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Aeolian-fluvial interplay erosion regions are subject to intense soil erosion and are of particular concern in loess areas of northwestern China. Understanding the composition, distribution, and transport processes of eroded sediments in these regions is of considerable scientific significance for controlling soil erosion. In this study, based on laboratory rainfall simulation experiments, we analyzed rainfall-induced erosion processes on sand-covered loess slopes (SS) with different sand cover patterns (including length and thickness) and uncovered loess slopes (LS) to investigate the influences of sand cover on erosion processes of loess slopes in case regions of aeolian-fluvial erosion. The grain-size curves of eroded sediments were fitted using the Weibull function. Compositions of eroded sediments under different sand cover patterns and rainfall intensities were analyzed to explore sediment transport modes of SS. The influences of sand cover amount and pattern on erosion processes of loess slopes were also discussed. The results show that sand cover on loess slopes influences the proportion of loess erosion and that the compositions of eroded sediments vary between SS and LS. Sand cover on loess slopes transforms silt erosion into sand erosion by reducing splash erosion and changing the rainfall-induced erosion processes. The percentage of eroded sand from SS in the early stage of runoff and sediment generation is always higher than that in the late stage. Sand cover on loess slopes aggravates loess erosion, not only by adding sand as additional eroded sediments but also by increasing the amount of eroded loess, compared with the loess slopes without sand cover. The influence of sand cover pattern on runoff yield and the amount of eroded sediments is larger than that of sand cover amount. Furthermore, given the same sand cover pattern, a thicker sand cover could increase sand erosion while a thinner sand cover could aggravate loess erosion. This difference explains the existence of intense erosion on slopes that are thinly covered with sand in regions where aeolian erosion and fluvial erosion interact.

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Section: Influences Of Sand Cover Amount On Erosion Processes Of Loesmentioning

confidence: 99%

Influences of sand cover on erosion processes of loess slopes based on rainfall simulation experiments

Zhang

et al. 2018

J. Arid Land

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“…These thresholds are agreement with Zhang et al . () who identified the slope gradient of 47% to be the threshold value of increasing runoff and associated soil loss.…”

Section: The Magpie Algorithmmentioning

confidence: 99%

Geomorphic process signatures reshaping sub‐humid Mediterranean badlands: 1. Methodological development based on high‐resolution topography

Llena

Vericat

Smith

et al. 2020

Earth Surf Processes Landf

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High‐resolution topography data sets have improved the spatial and temporal scales at which we are able to investigate the landscape through the analysis of landform attributes and the computation of topographic changes. Yet, to date, there have been only limited attempts to infer key geomorphic processes in terms of contributions to shaping the landscape. Highly erodible landscapes such as badlands provide an ideal demonstration of such an approach owing to the rapid changes observed over a relatively short time frame. In this technical note we present the Mapping Geomorphic Processes in the Environment (MaGPiE): a new algorithm that allows mapping of geomorphic process signatures through analysis of repeat high‐resolution topography data sets. The method is demonstrated in an experimental badland located in the southern central Pyrenees. MaGPiE is a geographic information system (GIS)‐based algorithm that uses as input: (a) terrain attributes (i.e. Slope, Roughness and Concentrated Runoff Index) extracted from digital elevation models (DEMs), and (b) a map of topographic changes (DEM of difference, DoD). Initial results demonstrate that MaGPiE allows the magnitude and the spatial distribution of the main geomorphic processes reshaping badlands to be inferred for the first time. © 2020 John Wiley & Sons, Ltd.

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“…Rainfall infiltration and runoff on the slope are the major factors leading to landslides, because they destroy the stability of the slope and reduce the safety factor of the slope, which leads to the occurrence of landslides. [2][3][4]. If the soil of the slope has good permeability and the rain infiltrates deeply, the shear strength of the slope will decrease, and the overall sliding instability will easily occur [5,6].…”

Section: Introductionmentioning

confidence: 99%

Seepage Analysis on the Surface Layer of Multistage Filled Slope with Rainfall Infiltration

Yuan

Cai

et al. 2020

Advances in Civil Engineering

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Based on the theory of rainfall infiltration, the surface infiltration model of multilevel filled slope was established by using the SEEP/W module of GeoStudio. The changes of the volumetric water content (VWC) and pore water pressure (PWP) in the surface of the slope during the rainfall infiltration were analyzed, and the influence of the change of the rainfall conditions on the VWC and PWP was considered. The analysis showed that VWC and PWP increased when the rain fell, and the growth rate of the higher feature point was higher. The affected area was concentrated on the upper part of the surface about 0.75 m. With the increasing of rainfall intensity, the slope surface getting to transient saturation state was quick, and the time of the PWP increasing to 0 among the feature points of same elevation was shortened. Meanwhile, the PWP presented a positive value, and as the infiltration depth increased, the transient saturation region expanded. The safety coefficient of the multistage filled slope was continuously reduced; after the stop of rainfall, the VWC and the PWP decreased, and the decline rate of the higher feature points was higher. In addition, the PWP of the lower part increased, and the safety factor of the slope presented a trend of rebound.

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Effects of slope gradient on hydro-erosional processes on an aeolian sand-covered loess slope under simulated rainfall

Cited by 36 publications

References 34 publications

Influences of sand cover on erosion processes of loess slopes based on rainfall simulation experiments

Influences of sand cover on erosion processes of loess slopes based on rainfall simulation experiments

Geomorphic process signatures reshaping sub‐humid Mediterranean badlands: 1. Methodological development based on high‐resolution topography

Seepage Analysis on the Surface Layer of Multistage Filled Slope with Rainfall Infiltration

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