CAS OpenIR  > 中科院上海应用物理研究所2011-2019年
Partial least squares regression for linking aggregate pore characteristics to the detachment of undisturbed soil by simulating concentrated flow in Ultisols (subtropical China)
Ma, RM; Cai, CF; Wang, JG; Wang, TW; Li, ZX; Xiao, TQ; Peng, GY
2015
Source PublicationJOURNAL OF HYDROLOGY
Volume524Pages:44—52
Subtype期刊文献
AbstractSoil pores are known as an effective medium for water, air, and chemical movement. However, quantifying pore structures and their relationship to the detachment of undisturbed soil by concentrated flow is not fully understood. The objectives of this study were to quantify 3D aggregate microstructures using synchrotron-based high-resolution X-ray micro-computed tomography (SR-mu CT) under wetting and drying cycles and to investigate the effects of pore characteristics on the detachment of undisturbed soil by simulating concentrated flow. The detachment rates (D-r) of undisturbed topsoil samples, which were subjected to a pretreatment of zero to eleven wetting and drying cycles, were measured in a 3.8-m-long, 0.2-m-wide hydraulic flume under unitary flow shear stresses (tau = 14.49 Pa); 3-5 mm aggregates were collected from the pretreatment soils, which were subjected to zero, five, and eleven wetting and drying cycles and were scanned at a 3.7 mu m voxel-resolution for reconstructing three-dimensional microtomography images. The relationships among pore characteristics and D-r were analyzed using partial least squares regression (PLSR). The results indicated that D-r and the aggregate microstructure changed significantly after the wetting and drying cycles. Dr was closely associated with the pore characteristics. The pore characteristics, such as a >100 mu m porosity, total porosity, fraction of regular pores, 30-75 mu m porosity, fraction of elongated pores, and fraction of irregular pores, were identified as the primary parameters that control the D-r. The pore characteristics and clay content could account for as much as 68.2% of the variation in D-r. D-r was significantly and positively related to a >100 mu m porosity, total porosity, and fraction of elongated pores. Thus, soil fragmentation depended on microcracks that formed during the wetting and drying cycles and on the geometrical characteristics of the pores or cracks. The results from this study provide a quantitative evaluation of the relationships between pore characteristics and the detachment of undisturbed soil by simulated concentrated flow. A further understanding of the effect of topsoil microstructure on water erosion and quantitative information for assessing and modeling erosion processes was obtained. (C) 2015 Elsevier B.V. All rights reserved.
KeywordMicro-computed Tomography Critical Shear-stress Overland-flow Vegetation Restoration Uniaxial Compression Southeastern China Sediment Yield Water Erosion Repacked Soil Shallow Flow
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/24523
Collection中科院上海应用物理研究所2011-2019年
Recommended Citation
GB/T 7714
Ma, RM,Cai, CF,Wang, JG,et al. Partial least squares regression for linking aggregate pore characteristics to the detachment of undisturbed soil by simulating concentrated flow in Ultisols (subtropical China)[J]. JOURNAL OF HYDROLOGY,2015,524:44—52.
APA Ma, RM.,Cai, CF.,Wang, JG.,Wang, TW.,Li, ZX.,...&Peng, GY.(2015).Partial least squares regression for linking aggregate pore characteristics to the detachment of undisturbed soil by simulating concentrated flow in Ultisols (subtropical China).JOURNAL OF HYDROLOGY,524,44—52.
MLA Ma, RM,et al."Partial least squares regression for linking aggregate pore characteristics to the detachment of undisturbed soil by simulating concentrated flow in Ultisols (subtropical China)".JOURNAL OF HYDROLOGY 524(2015):44—52.
Files in This Item: Download All
File Name/Size DocType Version Access License
Partial least square(1653KB)期刊论文作者接受稿开放获取CC BY-NC-SAView Download
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Ma, RM]'s Articles
[Cai, CF]'s Articles
[Wang, JG]'s Articles
Baidu academic
Similar articles in Baidu academic
[Ma, RM]'s Articles
[Cai, CF]'s Articles
[Wang, JG]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Ma, RM]'s Articles
[Cai, CF]'s Articles
[Wang, JG]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: Partial least squares regression for linking aggregate pore characteristics to the detachment of undisturbed soil by simulating concentrated flow in Ultisols (subtropical China).pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.