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| Comparison of methods for computing soil hydraulic conductivity measured by disc infiltrometer |
| Gao Xuemei1,2, She Dongli1,2, Fang Kai3 |
| 1.Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China, Ministry of Education, Hohai University, Nanjing, Jiangsu 210098, China; 2.National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Nanjing, Jiangsu 210098, China; 3.Suqian Water Conservancy Bureau, Suqian, Jiangsu 223800, China |
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Abstract Soil hydraulic conductivity is one of the most important soil hydraulic parameters. Precisely measuring and computing the conductivity not only can promote the theoretical study on water flow process in an unsaturated soil but also can provide a scientific basis for reasonable determination of technical parameters in irrigation and drainage of farmland. To check the applicability of various methods for computing hydraulic conductivity, a series of infiltration experiments are conducted on the soils collected from vegetable and tea gardens by using a disc infiltrometer with 10 cm and 20 cm discs under four different negative pressure heads, namely -9, -6, -3, and 0 cm. Then the conductivities are figured out by means of different computing methods. The results show that the hydraulic conductivity is less affected by the disc diameter, the conductivities given by various methods are nearly the same, and a smaller disc is therefore recommended for the field test. It is suggested that the choice of computing method for the conductivity depends on type of soil, for example, the conductivity of the soil from cultivated land such as a vegetable garden should be estimated by making use of a steady flow model, while for the soil in a tea garden, the transient flow model should be adopted. At the same pressure head, the hydraulic conductivity is obviously dependent on type of soil. The variations of hydraulic conductivity calculated by using different methods are almost the same under four pressure heads for two kinds of soil.
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Received: 28 July 2014
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| [1]陈世平, 李毅, 付秋萍. 不同含盐土壤圆盘入渗特征试验[J]. 农业工程学报, 2010,26(4):36-41. Chen Shiping, Li Yi, Fu Qiuping. Experimental of disk infiltration characteristics with different soil salt contents[J]. Transactions of the CSAE, 2010,26(4):36-41.(in Chinese)[2]武向博, 王全九, 樊军, 等. 不同土地利用方式下盘式吸渗仪测定土壤导水率方法比较[J]. 干旱地区农业研究,2012,30(1):94-98. Wu Xiangbo, Wang Quanjiu, Fan Jun, et al. Comparative study on measuring soil water conductivity in diffe-rent land use types by using disc infiltrometer[J]. Agricultural Research in the Arid Areas, 2012,30(1):94-98.(in Chinese)[3]White I, Sully M J. Macroscopic and microscopic capillary length and time scales from field infiltration[J]. Water Resources Research, 1987,23(8):1514-1522.[4]佘冬立, 邵明安, 俞双恩. 黄土高原水蚀风蚀交错带小流域土壤矿质氮空间变异性[J]. 农业工程学报, 2010,26(6):89-96. She Dongli, Shao Ming′an, Yu Shuang′en. Spatial varia-bility of soil mineral nitrogen in a small catchment in the wind-water erosion crisscross zone of Loess Plateau[J]. Transactions of the CSAE, 2010,26(6):89-96.(in Chinese)[5]Angulo-Jaramillo R, Jean-Pierre V, Stéphanie R, et al. Field measurement of soil surface hydraulic properties by disc and ring infiltrometers: A review and recent developments[J]. Soil and Tillage Research, 2000,55(1/2):1-29.[6]樊军, 王全九, 邵明安. 盘式吸渗仪测定土壤导水率的两种新方法[J]. 农业工程学报,2007,23(10):14-18. Fan Jun, Wang Quanjiu, Shao Ming′an. New methods for determining soil hydraulic conductivity by disc tension infiltrometers[J]. Transactions of the CSAE, 2007,23(10):14-18.(in Chinese)[7]李晓峰, 何武全. 利用圆盘入渗仪测定土壤水动力参数的入渗特征试验研究[J]. 灌溉排水学报, 2010,29(5):68-72. Li Xiaofeng, He Wuquan. Experimental study of disk infiltration characteristics with disc infiltrometer to mea-sure soil water motion parameters[J]. Journal of Irrigation and Drainage, 2010,29(5):68-72.(in Chinese)[8]王辉,杨小宝,田大作, 等. 紫鹊界梯田区不同土地利用类型土壤入渗特征研究[J]. 灌溉排水学报,2012,31(5):123-126,139. Wang Hui, Yang Xiaobao, Tian Dazuo, et al. Effect of land use types on infiltration characteristics in the Ziquejie terraces region[J]. Journal of Irrigation and Drainage, 2012,31(5):123-126,139.(in Chinese)[9]Scotter D R, Clothier B E, Harper E R. Measuring sa-turated hydraulic conductivity and sorptivity using twin rings[J]. Australian Journal of Soil Research, 1982,20(4):295-304.[10]Ankeny M D, Ahmed M, Kasper T C, et al. Simple field method for determining unsaturated hydraulic conductivity[J]. Soil Science Society of America Journal, 1991,55(2):467-470.[11]Reynolds W D, Elrick D E. Determination of hydraulic conductivity using a tension infiltrometer[J]. Soil Scien-ce Society of America Journal, 1991,55(3):633-639.[12]Smettem K R J, Parlange J-Y, Ross P J, et al. Three-dimensional analysis of infiltration from the disc infiltrometer: Ⅰ. A capillary-based theory[J]. Water Resources Research, 1994,30(11):2925-2929.[13]Haverkamp R, Ross P J, Smettem K R J, et al. Three-dimensional analysis of infiltration from the disc infiltrometer.Ⅱ. Physically-based infiltration equation[J]. Water Resources Research, 1994,30(11):2931-2935.[14]Vandervaere J P, Vauclin M, Elrick D E. Transient flow from tension infiltrometers. Part 2. Four methods to determine sorptivity and conductivity[J]. Soil Scien-ce Society of America Journal, 2000,64(4):1272-1284.[15]樊军,邵明安,王全九. 利用盘式入渗仪确定土壤水力学参数研究进展[EB/OL]. 北京:中国科技论文在线, 2005[2014-07-28]. http://www.paper.edu.cn/releasepaper/content/200512-546.[16]Budiman M, McBratney A B. Estimation of unsaturated hydraulic conductivity from field sorptivity measurements[J]. Geoderma, 2000,95(3/4):305-324.[17]Logsdon S D, Jaynes D B. Methodology for determining hydraulic conductivity with tension infiltrometers[J]. Soil Science Society of America Journal, 1993,57(5):1426-1431.[18]Hussen A A, Warrick A W. Alternative analyses of hydraulic data from disc tension infiltrometers[J]. Water Resources Research, 1993,29(12):4103-4108.[19]Joel A, Messing I. Application of two methods to determine hydraulic conductivity with disc permeameters on sloping land[J]. European Journal of Soil Science, 2000,51(1):93-98.[20]方堃, 陈效民, 张佳宝,等. 红壤地区典型农田土壤饱和导水率及其影响因素研究[J]. 灌溉排水学报, 2008,27(4):67-69. Fang Kun, Chen Xiaomin, Zhang Jiabao, et al. Satura-ted hydraulic conductivity and its influential factors of typical farmland in red soil region[J]. Journal of Irrigation and Drainage, 2008,27(4):67-69.(in Chinese)[21]李孝良, 陈效民, 周炼川, 等. 西南喀斯特地区土壤饱和导水率及其影响因素研究[J]. 灌溉排水学报, 2008,27(5):74-76,86. Li Xiaoliang, Chen Xiaomin, Zhou Lianchuan, et al. Soil saturated hydraulic conductivity and its influential factors in Southwest Karst region of China[J]. Journal of Irrigation and Drainage, 2008,27(5):74-76,86.(in Chinese)[22]辛平, 黄高宝, 张国盛, 等. 耕作方式对表层土壤饱和导水率及紧实度的影响[J]. 甘肃农业大学学报, 2005,40(2):203-207. Xin Ping, Huang Gaobao, Zhang Guosheng, et al. Effects of different tillage methods on saturated hydraulic conductivity and compactiveness of the surface soil[J]. Journal of Gansu Agricultural University, 2005,40(2):203-207.(in Chinese)[23]佘冬立, 刘营营, 俞双恩, 等. 不同土地利用方式下土壤水力性质对比研究[J]. 农业机械学报, 2014,45(9):175-179,186. She Dongli, Liu Yingying, Yu Shuang′en, et al. Comparison of soil hydraulic properties under different land use pattern[J]. Transactions of the Chinese Society for Agricultural Machinery, 2014,45(9):175-179,186.(in Chinese) |
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