红壤涌泉灌水分入渗试验及数值模拟  

Experimental Study and Numerical Simulation of Soil Water Infiltration Under Different Discharge of Red Soil Bubbled Irrigation

作　　者：赵新宇[1] 吴荣清 梁欣欣[1] 杨彦芬 

机构地区：[1]南昌工程学院,南昌330099

出　　处：《节水灌溉》2018年第2期51-55,共5页Water Saving Irrigation

基　　金：江西省教育厅科技项目(GJJ2016382);江西省水利科技项目(KT201543)

摘　　要：为了探索红壤涌泉灌的水分入渗规律,进行了不同流量下涌泉灌的水分入渗试验,依据非饱和土壤水分运动理论建立土壤入渗数学模型,采用软件HYDRUS-3D进行了求解,在模型验证后,采用数值模拟方法研究土壤水分入渗运动。模型验证说明:土壤含水率的模拟值与实测值相对误差较小,两种结果的吻合度比较高,涌泉灌土壤水分运动可以用该模型来模拟。数值模拟结果说明:随流量的增加,土壤水分运动特征值随之增大;随着时间的延长增减的幅度变小;入流量越大,湿润锋运移速度越快,土壤含水率增加的速率越大;当入渗达到稳定时,土壤含水率与流量呈等比例增加的关系。In order to explore the red soil bubbled irrigation water infiltration laws,the infiltration test of red soil bubbled irrigation with different flow rate was carried out based on kinematic theory of unsaturated soil moisture to establish a mathematical model of soil water infiltration,and the HYDRUS-3 D software was used to solve the model. After the model was verified through the laboratory experiment,the model was used to simulate the soil water infiltration. The results show that the simulated values and the measured values of soil moisture content relative error are small,and both have good consistency; the model can be used for irrigation of bubbled simulation of soil water movement. The numerical simulation results show that the characteristics of soil water movement increases with the increase of infiltration flow,but the amplitude decreases with time; the greater the infiltration flow rate and the faster velocity of wetting front,the greater rate of soil water content; when the infiltration is stable,the relationship between soil water content and infiltration rate is proportional increased.

关 键 词：涌泉灌溉 红壤土 HYDRUS-3D 土壤水分运动 数值模拟 

分 类 号：S275[农业科学—农业水土工程]