Hydraulic parameters and horizontal infiltration characteristics of hydrophobic soils
Liu Shibin1, Li Yi1, Robert Horton2
1.College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.Department of Agronomy, Iowa State University, Iowa 50011, USA
Abstract：Soil water retention curves of the soils with different water repellent levels were experimentally determined to analyze unsaturated water movement features. The suitability, which van Genuchten and Brooks-Corey models are used to fit the experimental data of soil water retention for loess soil, Shajiang black soil, alkali soil and sandy soil with various water repellent levels, was compared. In addition, a series of horizontal one-dimensional water infiltration experiments were carried out for the soils under various water repellent levels and Philip model and Kostiakov formula have been applied to fit the infiltration data. The relationship between soil permeability and WDPT(water drop penetration time)was analyzed as well. Finally, the soil water diffusivity was calculated, and its relation to volumetric water content was fitted by means of an exponential function. The results show that van Genuchten and Brooks-Corey models have better suitability for both hydrophilic and hydrophobic soils. There is a critical time in the cumulative infiltration-time curve of hydrophobic soils. Before that time, Kostiakov formula fits the experimental data more perfectly than Philip model does. When WDPT>40 s, the soil permeability tends to reach a stable level, just showing a change in the range of 0-0.1 cm/min0.5. It is feasible for exponential function to be applied to establish a relationship between soil unsaturated diffusivity and volumetric water content, in addition even better results can be achieved for hydrophilic soils. The hydraulic parameters and horizontal infiltration characteristics of hydrophobic soils are not only apparently different from hydrophobic soils but also exhibit a particularity.
刘世宾, 李毅, Robert Horton. 斥水土壤的水力参数及水平吸渗规律[J]. 排灌机械工程学报, 2013, 31(11): 1000-1006.
Liu Shibin, Li Yi, Robert Horton. Hydraulic parameters and horizontal infiltration characteristics of hydrophobic soils. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(11): 1000-1006.
[1]李毅,商艳玲,李振华,等. 国内外土壤斥水性研究进展[J]. 农业机械学报,2012,43(1):68-75. Li Yi, Shang Yanling, Li Zhenhua,et al. Advance of study on soil water repellency[J]. Transactions of the Chinese Society for Agricultural Machinery,2012,43(1):68-75.(in Chinese)[2]Debano L F. Water repellency in soils: A historical overview[J]. Journal of Hydrology, 2000,231/232:4-32.[3]Šimuunek J,van Genuchten M T,Gribb M M,et al. Parameter estimation of unsaturated soil hydraulic properties from transient flow processes[J]. Soil and Tillage Research, 1998, 47(1/2):27-36.[4]Il Hwang S, Powers S E. Estimating unique soil hydraulic parameters for sandy media from multi-step outflow experiments[J]. Advances in Water Resources, 2003, 26(4):445-456.[5]Cresswell H P,Paydar Z. Water retention in Australian soils: I. Description and prediction using parametric functions[J]. Australian Journal of Soil Research,1996,34(2):195-212.[6]Cresswell H P, Paydar Z. Functional evaluation of me-thods for predicting the soil water characteristic[J]. Journal of Hydrology, 2000, 227(1/2/3/4):160-172.[7]Chartier M P, Rostagno C M, Pazos G E. Effects of soil degradation on infiltration rates in grazed semiarid rangelands of northeastern Patagonia, Argentina[J]. Journal of Arid Environments, 2011,75(7):656-661.[8]辛琛,王全九,樊军. 负水头条件下的水平一维土壤吸渗特征[J]. 农业工程学报,2007,23(9):20-26. Xin Chen,Wang Quanjiu,Fan Jun. Characteristics of horizontal one-dimensional soil water infiltration under negative hydraulic head[J]. Transactions of the CSAE,2007,23(9):20-26.(in Chinese)[9]Valzano F P,Greene R S B,Murphy B W. Direct effects of stubble burning on soil hydraulic and physical properties in a direct drill tillage system[J]. Soil & Tillage Research,1997,42(3):209-219.[10]Moody J A,Kinner D A,Ubeda X. Linking hydraulic properties of fire-affected soils to infiltration and water repellency[J]. Journal of Hydrology,2009,379(3/4):291-303.[11]刘春成,李毅,任鑫,等. 四种入渗模型对斥水土壤入渗规律的适用性[J]. 农业工程学报,2011,27(5):62-67. Liu Chuncheng, Li Yi, Ren Xin, et al. Applicability of four infiltration models to infiltration characteristics of water repellent soils[J]. Transactions of the CSAE,2011,27(5):62-67.(in Chinese)[12]郭丽俊,李毅,李敏,等.盐渍化农田土壤斥水性与理化性质的空间变异性[J].土壤学报,2011,48(1):37-45. Guo Lijun, Li Yi, Li Min, et al. Spatial variability of soil water repellency and soil physical-chemical properties in a salinized-alkaline field[J].Acta Pedologica Sinica,2011,48(1):37-45.(in Chinese)[13]任鑫,李毅,李敏,等. 次生盐渍土垂向剖面斥水性及其与理化性质关系[J]. 农业机械学报,2011,42(3):58-64. Ren Xin, Li Yi, Li Min, et al. Relationship between soil water repellency and soil physical-chemical properties for vertical profiles in secondary saline field[J].Transactions of the Chinese Society for Agricultural Machinery,2011,42(3):58-64.(in Chinese)[14]Doerr S H,Shakesby R A,Walsh R P D. Soil water repellency: Its causes, characteristics and hydro-geomorphoogical significance[J]. Earth-Science Reviews, 2000,51(1/2/3/4):33-65.[15]Zavala L M,Granged A J P,Jordan A,et al. Effect of burning temperature on water repellency and aggregate stability in forest soils under laboratory conditions[J]. Geoderma,2010,158(3/4):366-374.[16]Dekker L W,Doerr S H,Olstindie K,et al. Water repellency and critical soil water content in a dune sand[J]. Soil Science Society of America Journal, 2001,65(6):1667-1674.[17]陈世平,李毅,高金芳. 覆膜开孔蒸发条件下斥水土壤水盐变化规律[J]. 农业机械学报,2011,42(5): 86-91. Chen Shiping, Li Yi, Gao Jinfang. Evaporation experiment on different water repellent soils under perforated plastic mulch[J]. Transactions of the Chinese Society for Agricultural Machinery,2011,42(5):86-91.(in Chinese)[18]雷志栋,杨诗秀,谢森传. 土壤水动力学[M]. 北京:清华大学出版社,1988.[19]Wang Z,Wu Q J,Wu L,et al. Effects of soil water repellency on infiltration rate and flow instability[J]. Journal of Hydrology,2000,231/232:265-276.[20]Brooks R H,Corey A J. Hydraulic properties of porous media[M]. Fort Collins:Colo State Univ, 1964.[21]Bauters T W J, Steenhuis T S, Dicarlo D A, et al. Physics of water repellent soils[J]. Journal of Hydrology,2000,231/232:233-243.[22]邵明安,王全九,黄明斌,等. 土壤物理学[M]. 北京:高等教育出版社,2006:129-130.[23]Carrick S, Buchan G, Almond P, et al. Atypical early-time infiltration into a structured soil near field capacity: The dynamic interplay between sorptivity, hydrophobicity, and air encapsulation[J]. Geoderma,2011,160(3/4):579-589.[24]来剑斌. 土壤水分运动特征及其参数确定[D]. 西安:西安理工大学水利水电学院,2003.
