膜孔灌土壤湿润体水分分布与入渗特性数值模拟  

Numerical Simulation on Soil Wetting Pattern Moisture Distribution and Infiltration Characteristics for Film Hole Irrigation

作　　者：范严伟[1] 马孝义[1] 王波雷[1] 高文强[1] 聂卫波[1] 

机构地区：[1]西北农林科技大学水利与建筑工程学院

出　　处：《农业机械学报》2008年第11期35-41,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(项目编号:50479052);国家科技支撑计划资助项目(项目编号:2006BAD11B04);西北农林科技大学青年学术骨干计划资助项目

摘　　要：以非饱和土壤水分运动理论为基础,建立了膜孔灌土壤水分运动的数学模型,并用SWMS-3D软件进行求解,利用室内试验对模拟结果进行分析验证,模拟值与实测值基本吻合,所建模型合理。用所建立的模型和方法对一定灌水技术要素组合下的土壤湿润体水分分布、膜孔入渗量进行数值模拟,结果表明:除膜孔间距大时,膜孔附近土壤水分分布不均匀程度增大外,土壤质地、容积密度、初始含水率、膜孔直径和灌溉水深对膜孔灌土壤水分分布模式影响较小。土壤质地、容积密度对膜孔灌的入渗特性影响显著,土壤初始含水率和灌溉水深对其影响较小。膜孔控制区域内的平均入渗水深主要受开孔率和膜孔直径的影响。Based on the theory for water movement in non-saturated soil, the mathematical model of him hole irrigation was developed to describe soil water movement of the film hole irrigation. The SWMS - 3D software was used to solve the model and the results were testified with laboratory experiments. The numerical simulation values are coincided with the experimental values, which show that the model is credible. Finally, the affects of irrigation water technologies elements on the soil wetting pattern, film hole infiltration volume of film hole irrigation were simulated and analyzed. The results indicate that the soil character, bulk density, initial water content, film hole diameter and irrigation water depth have slight effects on the wetting pattern, and the film hole space have obvious effects on the soil water contribution near the film hole when the film hole space is large. The soil character and bulk density have obvious effects on water infiltration characters. Meanwhile, initial water content and irrigated water depth have slight effects on water infiltration characters. The average infiltration water depth of film hole control zone with infiltration time is mainly affected by open hole ratio and film hole diameter.

关 键 词：膜孔灌 土壤湿润体 入渗特性 数学模型 数值模拟 

分 类 号：S275.9[农业科学—农业水土工程]