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《Transactions of the Chinese Society of Agricultural Engineering》 2011-03
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Determining the active region model parameter for modeling preferential flow in unsaturated soil

Sheng Feng1,2,Zhang Renduo3,Liu Huihai4(1.School of Hydraulic Engineering,Changsha University of Science and Technology,Changsha 410114,China;2.Hunan Provincial Key Laboratory of Water and Sediment Science and Water Hazard Prevention,Changsha University of Science and Technology,Changsha 410114,China;3.School of Environmental Science and Engineering,Zhongshan University,Guangzhou 510275,China;4.Earth Sciences Division,Lawrence Berkeley National Laboratory,Berkeley,CA 94720,USA)  
The active region model(ARM) parameter(γ) controls the generation and development of the preferential flow.Therefore,to obtain an accurate ARM parameter(γ) is essential for getting a precise prediction using ARM.In this study,dye staining methods were used to visualize the preferential flow patterns from their flow background,and the digital imaging procedure and soil sampling were conducted to obtain the distributions of dye stained region and soil water content of stained region,from which the ARM parameter(γ) was estimated by fitting these data according to the constitutive relation of ARM after infiltration.The determination methods for ARM parameter(γ) were presented according to 3 different kinds of distribution patterns of the soil water content of stained region after infiltration.The results indicated that,1) as a result of soil water redistribution,the active region and the dye stained region might not coincide with each other in the entire infiltrated soil profile,therefore,not all the data(soil water content and fraction of the dye stained region) from the entire infiltrated soil profile but only the data from the soil layer where the soil water contents were under increasing and less affected by the initial soil water contents could be used to determine the ARM parameter(γ);2) the soil texture generally had obviously significant impacts on the distribution of soil water content after infiltration,making the maximum soil water content of stained region occurred more probably at the soil surface in the fine-textured soil(e.g.silty clay and loam in this research) while making the maximum soil water content of stained region occurred more probably under the soil surface in the coarse-textured soil(e.g.sand in this research).
【Fund】: 国家自然科学基金资助项目(50528910 50609019);; 湖南省教育厅优秀青年基金资助项目(10B006)
【CateGory Index】: S152.7
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【Citations】
Chinese Journal Full-text Database 3 Hits
1 LI E~1,WANG Kang~2,ZHANG Ren-duo~1,SHENG Feng~1(1.Sun Yat-Sen University,Guangzhou 510275,China;2.Wuhan University,Wuhan 430072,China);Study on constitutive relations of active region model for heterogeneous water flow in porous media[J];Journal of Hydraulic Engineering;2008-02
2 SHENG Feng~1,WANG Kang~2,ZHANG Ren-duo~1,LI E~1(1.Sun Yet-Sen University,Guangzhou 510275,China;2.Wuhan University,Wuhan 430072,China);Study on heterogeneous characteristics of soil water flow in field by dye tracing method[J];Journal of Hydraulic Engineering;2009-01
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【Co-citations】
Chinese Journal Full-text Database 5 Hits
1 ZHANG Li-hua,WANG Cheng-wu (Faculty of Modern Agricultural Engineering,Kunming University of Science and Technology,Kunming 650224,China);Using Dye Tracer to Characterize Preferential Flow Movement on Soil Surface[J];Water Saving Irrigation;2010-05
2 Sheng Feng1,2,Zhang Renduo3,Liu Huihai4(1.School of Hydraulic Engineering,Changsha University of Science and Technology,Changsha 410114,China;2.Hunan Provincial Key Laboratory of Water and Sediment Science and Water Hazard Prevention,Changsha University of Science and Technology,Changsha 410114,China;3.School of Environmental Science and Engineering,Zhongshan University,Guangzhou 510275,China;4.Earth Sciences Division,Lawrence Berkeley National Laboratory,Berkeley,CA 94720,USA);Governing equations for modeling preferential flow in unsaturated soil based on fractal theory[J];Transactions of the Chinese Society of Agricultural Engineering;2011-02
3 SHENG Feng~1,WANG Kang~2,ZHANG Ren-duo~1,LI E~1(1.Sun Yet-Sen University,Guangzhou 510275,China;2.Wuhan University,Wuhan 430072,China);Study on heterogeneous characteristics of soil water flow in field by dye tracing method[J];Journal of Hydraulic Engineering;2009-01
4 ZHANG Wen-xian1,2,ZHANG Zhan-yu2,WANG Kang3(1.College of Agricultural Engineering,Hohai university,Nanjing 210098,China;2.Agriculture Husbandrym,Tibet University,Linzhi 860000,China3.State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China);Analysis of water movement in landfill cover soils using information theory measures[J];Advances in Water Science;2009-06
5 SHENG Feng1,WANG Kang2,ZHANG Ren-duo1,LI E1(1. Sun Yat-sen University,Guangzhou510275,China; 2. Wuhan University,Wuhan430072,China);Characterizing soil water flow heterogeneity using fractal characteristic parameter[J];Journal of Hydraulic Engineering;2009-12
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1 XIE Hua1,WANG Kang1,ZHANG Ren-duo2,TANG You-sheng1(1.State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China;2.School of Environment Science and Engineering,Sun Yat-sen(Zhongshan) University,Guangzhou 510275,China);Characterizing Uniformity of Soil Water Movement by Dye Infiltration Experiments[J];Journal of Irrigation and Drainage;2007-01
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