IMHE OpenIR  > 山地灾害与地表过程重点实验室
Alternative TitlePreferential Flow Infiltration Model for Wide Grading Soils Subject to Rainfall Infiltration
苏立君1,2,3,4; 刘超1,2,4,5; 余方威1,2; 张崇磊1,2; 徐兴倩6
Corresponding Author刘超
Source Publication工程科学与技术
Other Abstract



Pore diameters of wide grading soil are across several orders of magnitude.A preference flow which is a kind of unbalanced infiltration in space usually appears under rainfall infiltration condition.Based on the fractal structure of pores,quantitative demonstration of rainfall infiltration mechanism in wide grading soil was analyzed.According to the theory of fractal porous media and Hagen-Poiseulle equation,the orders of infiltration rate in different pore pipes were different.On this basis,soil pores were divided two regionsa matrix region and a preferential flow region. Their area ratio changed with rainfall intensity.In the matrix region,the infiltration rates of pore pipes were different and all of them reached their own maximum.However,in the preferential flow region,the infiltration rates of pore pipes were the same and they didnt reach their own maximum.The matrix region was composed of small diameter pore pipes and the preference flow region was composed of large diameter pore pipes.The magnitude of infiltration rate in the matrix region was far less than that in the preferential flow region.The expressions of infiltration amount and infiltration rate were developed in two regions.Infiltration features in different rainfall intensities and the relationship between area ratio and rainfall intensity were studied.The results showed that infiltration rate in the preferential flow region was much higher and it increased with the increase of rainfall intensity.The preferential flow phenomenon was produced by the multi-scale pore structure and free infiltration boundary without surface pond pressure.The value and distribution of infiltration rate were influenced by saturated permeability coefficient of soil and the rainfall intensity.The mechanism of a preferential flow was explained from the pores structure perspective.


Keyword宽级配砾石土 分形 多尺度 优先流 降雨入渗
Subject AreaP642.1
Indexed ByEI ; CSCD ; 北大中文核心
Funding Organization国家重点基础研究发展计划资助项目(2013CB733201) ; 中科院重点部署项目资助(KZZD-EW-05-01) ; 中科院百人计划资助项目(苏立君) ; 国家自然科学基金资助项目(51278397)
Accession numberAccession number: 20172603839205
Citation statistics
Cited Times:1[CSCD]   [CSCD Record]
Document Type期刊论文
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
苏立君,刘超,余方威,等. 宽级配砾石土中降雨入渗的优先流模型[J]. 工程科学与技术,2017,49(3):37-43.
APA 苏立君,刘超,余方威,张崇磊,&徐兴倩.(2017).宽级配砾石土中降雨入渗的优先流模型.工程科学与技术,49(3),37-43.
MLA 苏立君,et al."宽级配砾石土中降雨入渗的优先流模型".工程科学与技术 49.3(2017):37-43.
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