Impacts of soil properties on flow velocity under rainfall events: Evidence from soils across the Loess Plateau

Sun, L; Zhou, JL; Cai, Q

Impacts of soil properties on flow velocity under rainfall events: Evidence from soils across the Loess Plateau

Sun, L Zhou, JL Cai, Q

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Publisher:: ELSEVIER
Publication Type:: Journal Article
Citation:: Catena, 2020, 194
Issue Date:: 2020-11-01

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Field	Value	Language
dc.contributor.author	Sun, L
dc.contributor.author	Zhou, JL
dc.contributor.author	Cai, Q
dc.date.accessioned	2021-02-10T19:49:26Z
dc.date.available	2021-02-10T19:49:26Z
dc.date.issued	2020-11-01
dc.identifier.citation	Catena, 2020, 194
dc.identifier.issn	0341-8162
dc.identifier.issn	1872-6887
dc.identifier.uri	http://hdl.handle.net/10453/146022
dc.description.abstract	© 2020 Elsevier B.V. Flow velocity is one of the most significant hydraulic parameters directly connected to sediment transport-deposition processes. Four soils were collected from north to south of the Loess Plateau, namely Sandy Loess (SL), Loessial Soil (LS), Heilu Soil (HS) and Anthrosol Soil (AS), to examine the impacts of soil property on mean flow velocity in both interrill and rill flows under different simulated rainfall experiments. The mean velocity of interrill flow (MVIF) followed the order of LS > HS ≈ AS > SL at 90 mm h−1 rainfall intensity and LS > HS > AS > SL at 120 mm h−1 rainfall intensity. The mean velocity of rill flow (MVRF) decreased as LS ≈ HS > AS at 90 mm h−1 and LS ≈ HS > AS > SL at 120 mm h−1. The order of MVIF and MVRF on four soil slopes is determined by the relations of runoff discharge, Darcy-Weisbach friction factor in interrill area (fI) and rills (fR), which are closely related to soil properties. Soil properties also changed the effects of rainfall intensity on flow velocities in different erosion stages, resulting in the increasing trend of MVIF on SL, HS and AS slopes and the decreasing trend of MVIF on LS slope with the increase of rainfall intensity. Moreover, soil properties may change the variations of MVIF and MVRF with the increase of slope gradient, by altering the relations of sealing progress and slope effect. The slope effect determined the increasing trend of MVIF with the increase of slope gradients. However, the sealing progress may offset the slope effect and cause the decrease of MVIF on the critical slopes, and the critical slope decreased from the north (20° and 25°) to the south (15°). The equal roles of rill bed roughness and slope effect caused the unchanged of MVRF on LS and HS slopes, while rill bed roughness dominated the fluctuations of MVRF on SL and AS slopes.
dc.language	English
dc.publisher	ELSEVIER
dc.relation.ispartof	Catena
dc.relation.isbasedon	10.1016/j.catena.2020.104704
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject	0403 Geology, 0406 Physical Geography and Environmental Geoscience, 0503 Soil Sciences
dc.subject.classification	Geochemistry & Geophysics
dc.title	Impacts of soil properties on flow velocity under rainfall events: Evidence from soils across the Loess Plateau
dc.type	Journal Article
utslib.citation.volume	194
utslib.for	0403 Geology
utslib.for	0406 Physical Geography and Environmental Geoscience
utslib.for	0503 Soil Sciences
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	open_access	*
utslib.copyright.embargo	2022-11-01T00:00:00+1000Z
dc.date.updated	2021-02-10T19:49:14Z
pubs.publication-status	Published
pubs.volume	194

Abstract:

© 2020 Elsevier B.V. Flow velocity is one of the most significant hydraulic parameters directly connected to sediment transport-deposition processes. Four soils were collected from north to south of the Loess Plateau, namely Sandy Loess (SL), Loessial Soil (LS), Heilu Soil (HS) and Anthrosol Soil (AS), to examine the impacts of soil property on mean flow velocity in both interrill and rill flows under different simulated rainfall experiments. The mean velocity of interrill flow (MVIF) followed the order of LS > HS ≈ AS > SL at 90 mm h−1 rainfall intensity and LS > HS > AS > SL at 120 mm h−1 rainfall intensity. The mean velocity of rill flow (MVRF) decreased as LS ≈ HS > AS at 90 mm h−1 and LS ≈ HS > AS > SL at 120 mm h−1. The order of MVIF and MVRF on four soil slopes is determined by the relations of runoff discharge, Darcy-Weisbach friction factor in interrill area (fI) and rills (fR), which are closely related to soil properties. Soil properties also changed the effects of rainfall intensity on flow velocities in different erosion stages, resulting in the increasing trend of MVIF on SL, HS and AS slopes and the decreasing trend of MVIF on LS slope with the increase of rainfall intensity. Moreover, soil properties may change the variations of MVIF and MVRF with the increase of slope gradient, by altering the relations of sealing progress and slope effect. The slope effect determined the increasing trend of MVIF with the increase of slope gradients. However, the sealing progress may offset the slope effect and cause the decrease of MVIF on the critical slopes, and the critical slope decreased from the north (20° and 25°) to the south (15°). The equal roles of rill bed roughness and slope effect caused the unchanged of MVRF on LS and HS slopes, while rill bed roughness dominated the fluctuations of MVRF on SL and AS slopes.

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