水利学报2017，Vol.48Issue(8)：933-944,12.DOI:10.13243/j.cnki.slxb.20161006
空气阻力影响下的分层土壤非稳定降雨入渗产流模型
Infiltration-runoff model affected by air resistance for layered soil during unsteady rainfall
摘要
Abstract
During the period of rainfall or irrigation,the air in soils fails to fully escape,which is trapped in soils and causes air resistance that hinders soil water infiltration.Considering the impact of air resistance on the soil water infiltration process,the Green-Ampt model is modified.A modified Green-Ampt model (MGAM) is proposed for simulating infiltration into layered soil profile with consideration of air resistance under unsteady rainfall.In order to account for the effect of air resistance,the saturation coefficient (Sa),actual water content (θa),air bubbling pressure (hab) and water bubbling pressure (hwb) are introduced in the model.All parameters could be approximately determined by soil physical properties.To evaluate the performance of MGAM developed by the authors,one-dimensional infiltration-runoff experiments are performed in multi-layered soil columns during unsteady rainfall with air confined.Then soil cumulative infiltration,runoff rate and soil water content calculated by MGAM are compared with the observed data from the experiments,and the calculated results of the traditional Green-Ampt model (TGAM) without consideration of air resistance.The results indicate that soil cumulative infiltration,runoff rate and soil water content calculated by MGAM are all in better agreement with the observed than the existed models.The calculated soil water content and soil cumulative infiltration by TGAM are larger than the observed,and runoff rate is less than the observed.关键词
分层土壤/Green-Ampt模型/入渗产流/空气阻力Key words
multi-layered soil/Green-Ampt model/infiltration-runoff/air resistance分类
农业科技引用本文复制引用
甘永德,贾仰文,刘欢,仇亚琴,牛存稳..空气阻力影响下的分层土壤非稳定降雨入渗产流模型[J].水利学报,2017,48(8):933-944,12.基金项目
国家重点基础研究发展规划项目(2015CB452701) （2015CB452701）
国家自然科学基金项目(51379215,50939006) （51379215,50939006）
流域水循环模拟与调控国家重点实验室自主研究课题(2016ZY03) （2016ZY03）
