水利学报2017，Vol.48Issue(7)：799-807,9.DOI:10.13243/j.cnki.slxb.20161216
南方丘陵区多层土壤结构水平和垂向渗流特征试验与模拟研究
Field experiment and simulation of lateral and vertical water flow in multi-layer soil in hilly region of southern China
摘要
Abstract
With undulating conditions in hilly region of southern China,the mechanism of soil water transformation is complicated due to different soil textures between upstream and downstream fields as well as different layers within field.In order to reveal the influence of field different layers on soil water movement,field experiment was conducted in Tuanlin experimental irrigation station of Zhanghe irrigation district in Hubei province.Both water lateral infiltration through the cultivated horizon layer(CHL) and vertical infiltration through plow pan layer(PPL) under variable water table in field were monitored or estimated in the experiment.The processes were also simulated by a two-dimensional soil water movement model under variable water head using HYDRUS-2D,which show that the simulated results agree well with observed values.The results demonstrate that the PPL with compact structure in field,decreased deep percolation by retarding water vertical movement,but at the same time enhanced water lateral movement through the CHL.The average soil stable vertical infiltration rate through the PPL was 0.006cm/min,while the average soil stable lateral infiltration rate through the CHL was 0.05cm/min.Based on the analysis of soil water balance at the stage of steadily infiltration,the total percolation in experiment area accounted for 21.11％ of the cumulative infiltration,0.46％ and 20.65％ of which were attributed to the vertical percolation and lateral seepage,respectively,and the CHL contributed 81.06％ to the lateral seepage.The study illustrates that the lateral seepage plays an important role in water losses so that it is very essential to control percolation especially lateral seepage for water-saving and drainage reduction in southern China.关键词
南方丘陵区/多层土壤/土壤含水率/累积入渗量/侧向渗漏/HYDRUS-2DKey words
southern hilly region/multi-layer soil/soil water content/cumulative infiltration/lateral seepage/HYDRUS-2D分类
农业科技引用本文复制引用
邵东国,杨霞,徐保利,顾文权..南方丘陵区多层土壤结构水平和垂向渗流特征试验与模拟研究[J].水利学报,2017,48(7):799-807,9.基金项目
国家自然科学基金(51439006) （51439006）
“十三五”国家重点研发计划课题(2016YFC0400101) （2016YFC0400101）
