水科学进展2017，Vol.28Issue(6)：829-838,10.DOI:10.14042/j.cnki.32.1309.2017.06.004
沟灌土壤湿润体空间矩特征参数估算模型
Estimated model for spatial moment character parameters of wetted pattern under furrow irrigation infiltration
摘要
Abstract
In order to further improve the practicality of moment analysis theory on the study of the transport charac-teristics of wetted pattern under tow-dimensional infiltration of furrow irrigation, the effects of initial soil water content, water depth, bottom width and slope parameter on the spatial moment character parameters of soil wetted pattern under free infiltration were studied quantitatively by combination of numerical simulation and theoretical analysis method. The function relationship between the spatial moment character parameters of soil wetted pattern and the main influence factors was established. The results showed that the mass center of vertical soil moisture distribution is greatly influ-enced by initial water content, water depth and bottom width. The average dispersion of the horizontal wetted front is mainly influenced by initial water content, water depth, bottom width and slope parameter, while the average disper-sion of the vertical soil wetted front has higher sensitivity to initial water content and water depth. Then, the reliability of the model was further verified through several different soil textures. The results showed that the values of spatial moment character parameters estimated by the proposed model at different infiltration times agree well with calculated values based on the simulation results by the HYDRUS software. The mean absolute values of the relative error of all combinations were lower than 8. 5％, and there was no significant difference, which indicated the proposed model can be used to estimate the spatial moment character parameters of soil wetted pattern under furrow irrigation with a high reliability. The results can provide theoretical basis and technical support for the design and management of furrow irri-gation.关键词
沟灌/土壤湿润体/矩分析/特征参数Key words
furrow irrigation/soil wetted pattern/moment analysis/character parameters分类
农业科技引用本文复制引用
聂卫波,马孝义,聂坤堃,费良军..沟灌土壤湿润体空间矩特征参数估算模型[J].水科学进展,2017,28(6):829-838,10.基金项目
国家自然科学基金资助项目(51579205) （51579205）
国家重点研发计划资助项目(2016YFC0400203)The study is financially supported by the National Natural Science Foundation of China (No. 51579205) and the National Key R&D Program of China (No. 2016YFC0400203). （2016YFC0400203）
