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Apportioning contributions of individual rill erosion processes and their interactions on loessial hillslopes
Qin, Chao1,2; Zheng, Fenli1,3; Wilson, Glenn V.4; Zhang, Xunchang J.5; Xu, Ximeng6
2019-10-01
Source PublicationCATENA
ISSN0341-8162
Volume181Pages:11
Corresponding AuthorZheng, Fenli(flzh@ms.iswc.ac.cn)
AbstractChannels (rill, ephemeral gully, gully and river channel) exhibit a continuum of sizes and flow magnitudes. Rill erosion, as the initial stage of channel erosion, accounts for > 80% of total eroded sediments on sloping fanning lands in many parts of the world. Previous researches often regard rill erosion as an entirety or focus on individual rill erosion process separately. Few attentions have been paid to the contributions of individual processes including nil headcut advance, bed incision, sidewall expansion and their interactions to the over-all rill erosion. Thus, simulated upslope inflow experiments were designed to investigate the impacts of individual processes involved and their interactions in rill erosion under four inflow rates (1.0, 2.0, 3.0 and 4.0 L min(-1)) and two slope gradients (15 degrees and 20 degrees). Photogrammetry and manual sampling were used to measure hillslope morphology variation and sediment delivery, repectively. The results show that headcut advance, bed incision and sidewall expansion interact with each other and exhibit both independent and dependent features across spatial and temporal scales. Headcut advance interacts with bed incision and sidewall expansion before rill head advancing to a critical slope length. Initial rill depth and width are determined by initial headcut morphology. Bed incision and sidewall expansion dominate rill erosion before and after the non-erodible layer is exposed to concentrated flow, respectively. Headcut advance contributed the largest amount of rill erosion (44%-68%), followed by bed incision (27%-44%) and sidewall expansion (3.8%-12%). Headcut advance contributed more (63%-83%) to total rill width increment while bed incision contributed larger percentage (51%-65%) to total rill depth increment. Prediction equations for length, width and depth of a single rill on a loessial hillslope and empirical equations of rill erosion for the individual erosion processes were fitted and validated. Quantification and understanding of the contributions of individual rill erosion processes provides the necessary scientific basis for the development of process-based rill erosion models, and then, for preventions of soil losses and land degradation.
KeywordChannel erosion Headcut advance Bed incision Sidewall expansion Loess plateau
DOI10.1016/j.catena.2019.104099
WOS KeywordEPHEMERAL GULLY EROSION ; HEAD CUT EROSION ; BANK-EROSION ; SOIL-EROSION ; SIMULATION ; MODEL ; MIGRATION ; MECHANISMS ; INCISION ; RAINFALL
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51639005] ; National Key R&D Program of China[2016YFE0202900] ; External Cooperation Program of Chinese Academy of Sciences[161461KYSB20170013] ; Postdoctoral Innovation Talents Support Program of China[BX20190177]
Funding OrganizationNational Natural Science Foundation of China ; National Key R&D Program of China ; External Cooperation Program of Chinese Academy of Sciences ; Postdoctoral Innovation Talents Support Program of China
WOS Research AreaGeology ; Agriculture ; Water Resources
WOS SubjectGeosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS IDWOS:000477686600037
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/58272
Collection中国科学院地理科学与资源研究所
Corresponding AuthorZheng, Fenli
Affiliation1.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Fanning Loess P, Yangling 712100, Shaanxi, Peoples R China
2.Tsinghua Univ, State Key Lab Hydrosci & Engn, Beijing 100084, Peoples R China
3.CAS & MWR, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China
4.USDA ARS, Natl Sedimentat Lab, Oxford, MS 38655 USA
5.USDA ARS, Grazinglands Res Lab, El Reno, OK 73036 USA
6.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Qin, Chao,Zheng, Fenli,Wilson, Glenn V.,et al. Apportioning contributions of individual rill erosion processes and their interactions on loessial hillslopes[J]. CATENA,2019,181:11.
APA Qin, Chao,Zheng, Fenli,Wilson, Glenn V.,Zhang, Xunchang J.,&Xu, Ximeng.(2019).Apportioning contributions of individual rill erosion processes and their interactions on loessial hillslopes.CATENA,181,11.
MLA Qin, Chao,et al."Apportioning contributions of individual rill erosion processes and their interactions on loessial hillslopes".CATENA 181(2019):11.
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