Wind Erosion

Knight, Jasper

doi:10.1002/9781118945650.ch3

Cited by 4 publications

(1 citation statement)

References 134 publications

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“…For dust particles, the threshold friction velocity increases rapidly with the decrease of diameter (Shao & Lu, 2000), and hence, the dust emission rate caused by aerodynamic lift is generally much smaller than that of the other two. Just as pointed out by Knight (2019), "wind erosion" is something of a misnomer, because wind-eroded features are shaped by airborne grains rather than the wind itself. Surface erosion due to particle impact is an ongoing topic despite decades of investigations and research (Tarodiya & Levy, 2021).…”

Section: Introductionmentioning

confidence: 99%

An expression for wind erosion rate from dry and dense soil surface

Wang

2023

European J Soil Science

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Wind erosion is a physical process predominated by airborne grains rather than the wind itself. The soil deformation is either elastic–plastic or fully plastic during its collisions with solid grains, corresponding to dense and loose soils, respectively. Only the fully plastic deformation was previously taken into account in the physically‐based wind erosion models. The impact erosion of dry and dense soil surface can be well quantified by the contact mechanics and strength theories. In this study, with the help of Owen's uniform saltation model, a simple expression for wind erosion rate is derived based upon the eroded volume per impact when soil deforms in the elastic–plastic manner. The new expression, a simple analytical function of several conventional variables and parameters of wind and soil, describes the effects of saltation flux and soil susceptibility. Its validity is verified by some field and laboratory experiments.

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Section: Introductionmentioning

confidence: 99%

An expression for wind erosion rate from dry and dense soil surface

Wang

2023

European J Soil Science

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Biocrust as a surface protection of erodible nebkhas

Tan,

Luo,

Wang

2024

Earth Surf Processes Landf

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Since the timescale of a nebkha from the initial formation to the eventual destruction might be 1 to 200 years, little is known about the whole evolutionary path. In the phase of erosion and deflation, nebkhas are usually one source of aeolian sand and dust. Biocrust, a common living cover in arid and semiarid regions, could influence dune dynamic. In this study, the shear strength and hardness of the windward slope surface of erodible nebkhas are measured in the upwind margin of the Minqin oasis, China. It is found that both the shear strength and hardness of topsoil are commonly larger than these under the biocrust layer. From the force‐balance equation about the vane shear test, a novel expression for the shear strength of biocrust is derived. The field experiment in the windy season of 2023 shows that the biocrust layer of topsoil can effectively increase the resistance of nebkha surface against wind erosion. The relative larger strength and the self‐repair function of biocrust supported by the local non‐rain water are two main reasons the erodible nebkhas can exist for decades.

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Hamadas and Desert Pavements

Knight

2023

World Geomorphological Landscapes

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Wind Erosion

Cited by 4 publications

References 134 publications

An expression for wind erosion rate from dry and dense soil surface

An expression for wind erosion rate from dry and dense soil surface

Biocrust as a surface protection of erodible nebkhas

Hamadas and Desert Pavements

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