摘要
为进一步探明沟灌二维土壤水分运动规律,以非饱和土壤水分运动理论为基础,建立了沟灌土壤水分运动数学模型,用多组试验资料对模型模拟结果进行验证,两者基本吻合,表明模型可用于模拟沟灌二维土壤水分入渗过程。用所建模型对不同因素组合下沟灌土壤湿润体特性进行模拟分析,结果表明:土壤初始含水率、沟间距对沟灌累积入渗量影响较小,土壤质地、容重、沟底宽和沟中水深对其影响较为显著;沟底宽、土壤初始含水率对土壤湿润体水分分布影响较小,土壤质地、容重对其影响较大,沟间距、沟中水深对其影响主要在零通量面附近,当入渗发生交汇后,零通量面处垂向湿润锋运移加快。以此为基础,建立了包含湿周在内的沟灌累积入渗量计算模型。
Based on unsaturated soil water movement theory, the mathematical model of furrow irrigation is developed to un- derstand the characteristic of Two-dimensional soil water movement in furrow irrigation. The simulation results are verified by the laboratory experiments and agreed well with the experiments measurement values, which shown that the mathematical model can be used to study the two-dimensional soil water infiltration in furrow irrigation. The soil wetted volume characteristic of fur- row irrigation are simulated and analyzed under different factor combination by this model, the results indicate that soil initial water content and furrow spacing have slight effect on the accumulation infiltration quantity of furrow irrigation, meanwhile the soil character, bulk density, water depth and bottom width have obvious effect on the accumulation infiltration quantity. The bottom width and soil initial water content have a littler influence on the wetting pattem and the wetting soil movement migra- tion, but the soil character and bulk density have a great influence on it. The water depth and furrow spacing have an effect on the water contribution near the zero flux plane, the vertical moist front migration has accelerated after interference infiltration near the zero flux plane. Taking these results as the foundation, the two-dimensional infiltration model for furrow irrigation was established which contained the wetted perimeter.
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2009年第5期668-676,共9页
Advances in Water Science
基金
国家自然科学基金资助项目(50879072)
'十一五'国家科技支撑计划课题(2006BAD11B04)~~
关键词
沟灌
二维土壤水分运动
土壤湿润体
数值模拟
入渗模型
furrow irrigation
two-dimensional soil water movement
soil wetted volume
numerical simulation
infiltration model
