Prediction model of wetted front migration distance under bubbled root irrigation
ZHANG Zhi-Tao, WU Pu-Te, CHEN Jun-Ying, ZHU De-Lan, FAN Xiao-Kang
(1.College of Water Resources and Architectural Engineering, Northwest A＆F University, Yangling, Shaanxi 712100, China; 2.Southern Plains Agricultural Research Center, Agricultural Research Service, USDA, College Station, TX 77845, USA; 3.Department of Biological and Agricultural Engineering, Texas A＆M University, College Station, TX 77843, USA; 4.Insititute of Soil and Water Conservation, CAS&MWK, Yangling, Shaanxi 712100, China)
Abstract：In order to further research the characteristic variation of wetting body in bubbledroot irrigation, the following four factors as different soil bulk density, initial soil moisture, the length and burying depth of pervious sleeve of emitter of clay loam soil as an example were studied experimentally indoors to investigate the effects of these factors on wetting body in bubbledroot irrigation. The result shows that the velocity of wetted front decreases when the soil bulk density increases and increases when the initial soil moisture and the length of pervious sleeve of emitter increase while the burying depth has little effect on it. There is a power index relationship between wetted front and time and the index is 032 and 02 for horizontal and vertical orientation respectively. Prediction models were built for horizontal and vertical wetted front distance. Comprehensive prediction model with parameters of soil bulk density, initial soil moisture, the length of pervious sleeve of emitter and depth was built. After comparing the predicted and measured data, it is found that comprehensive prediction model has better prediction precision.
［1］Singh D K, Rajput T B S, Sikarwar H S, et al. Simulation of soil wetting pattern with subsurface drip irrigation from line source［J］. Agricultural Water Management, 2006,83(1／2):130-134.［2］Cote C M,Bristow K L,Charlesworth P B,et al.Analysis of soil wetting and solute transport in subsurface trickle irrigation［J］.Irrigation Science,2003,22(3／4):143-156.［3］李明思, 康绍忠, 孙海燕. 点源滴灌滴头流量与湿润体关系研究［J］. 农业工程学报, 2006, 22(4): 32-35.Li Mingsi, Kang Shaozhong, Sun Haiyan. Relationships between dripper discharge and soil wetting pattern for drip irrigation［J］. Transactions of the CSAE, 2006, 22(4): 32-35. (in Chinese)［4］Bhatnagar P R,Chauhan H S.Soil water movement under a single surface trickle source［J］.Agricultural Water Management,2008,95(7):799-808.［5］Patel Neelam, Rajput T B S. Dynamics and modeling of soil water under subsurface drip irrigated onion［J］. Agricultural Water Management, 2008,95(12):1335-1349.［6］李淑芹,王全九.垂直线源入渗土壤水分分布特性模拟［J］.农业机械学报,2011,42(3):52-57.Li Shuqin,Wang Quanjiu. Simulation of soil water distribution under vertical line source infiltration［J］. Transactions of the Chinese Society for Agricultural Machinery,2011,42(3):52-57. in Chinese)［7］范严伟，马孝义，王波雷，等.膜孔灌土壤湿润体水分分布与入渗特性数值模拟［J］.农业机械学报，2008，39（11）：35-41.Fan Yanwei,Ma Xiaoyi,Wang Bolei,et al.Numerical simulation on soil wetting pattern moisture distribution and infiltration characteristics for film hole irrigation［J］.Transactions of the Chinese Society for Agricultrual Machinery,2008,39(11):35-41.(in Chinese)［8］胡和平,高龙,田富强.地表滴灌条件下土壤湿润体运移经验方程［J］.清华大学学报:自然科学版,2010,50(6):839-843.Hu Heping,Gao Long,Tian Fuqiang.Empirical equation for development of soil wetted body under surface drip irrigation condition［J］.Journal of Tsinghua University:Science and Technology,2010,50(6):839-843.(in Chinese)［9］黎朋红, 汪有科, 马理辉,等. 涌泉根灌湿润体特征值变化规律研究［J］. 水土保持学报, 2009, 23(6): 190-194.Li Penghong, Wang Youke, Ma Lihui, et al. Study on eigenvalues of wetted soil under surge root irrigation［J］. Journal of Soil and Water Conservation, 2009, 23(6): 190-194.（in Chinese）［10］费良军,曹俊,聂卫波.涌泉根灌土壤湿润体特性试验［J］.排灌机械工程学报, 2011, 29(3): 260-265.Fei Liangjun,Cao Jun,Nie Weibo. Characteristics test of wetting body of surge and spring root irrigation［J］. Journal of Drainage and Irrigation Machinery Engineering, 2011, 29(3): 260-265. (in Chinese)［11］张林,吴普特,范兴科.多点源滴灌条件下土壤水分运动的数值模拟［J］.农业工程学报, 2010, 26(9):40-45.Zhang Lin,Wu Pute,Fan Xingke.Numerical simulation of soil water movement with drip irrigation of multiple point sources［J］.Transactions of the CSAE,2010,26(9):40-45.(in Chinese)
