宽垄沟灌土壤水分累积入渗特性模拟研究  

Study on Experiment and Simulation of Cumulative Infiltration under the Wide Ridge Furrow Using HYDRUS

作　　者：汪顺生 刘帅冶 傅渝亮 王爱滨 陈春来 燕永芳 WANG Shunsheng;LIU Shuaiye;FU Yuliang;WANG Aibin;CHEN Chunlai;YAN Yongfang(Department of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;Yellow River Institute of Hydraulic Research,Zhengzhou 450003,China)

机构地区：[1]华北水利水电大学水利学院,郑州450046 [2]黄河水利科学研究院,郑州450003

出　　处：《灌溉排水学报》2020年第12期57-63,共7页Journal of Irrigation and Drainage

基　　金：国家自然科学基金项目(51779093);河南省科技攻关项目(182102310049)。

摘　　要：【目的】探究宽垄沟灌土壤初始含水率和压力水头对累积入渗量的影响。【方法】利用Hydrus-2D模拟均质土在5种不同初始含水率(8%、10%、12%、16%和20%)和压力水头(3、6、9、12 cm和15 cm)条件下的宽垄沟灌过程,分析初始含水率和压力水头对土壤累积入渗量的影响;在电容充电模型基础上建立宽垄沟灌累积入渗量与入渗时间的经验模型并进行验证试验。【结果】宽垄沟灌土壤累积入渗量随着压力水头的增大而增大,随土壤初始含水率的增大而呈减小的趋势。经验模型模拟值较为接近验证试验实测值,R=0.986模拟效果较好。【结论】增大压力水头或减小土壤初始含水率有利于宽垄沟灌累积入渗量的增加,且对非线性入渗阶段影响较为明显;所建立的宽垄沟灌累积入渗模型具有较高的准确性。【Background】Wide ridge irrigation technology belongs to the category of ditch irrigation,and its water infiltration process is two-dimensional infiltration.Soil volume mass,texture,irrigation ditch type,furrow specification,soil initial moisture content and pressure head during irrigation would affect the infiltration of water.At present,many scholars have carried out research on the characteristics of furrow irrigation and infiltration through a large number of indoor and outdoor experiments,but the research on wide ridge irrigation is less,and there is no more systematic model of wide ridge irrigation and infiltration.【Objective】In order to explore the influence of pressure head and initial soil moisture content on cumulative infiltration.【Method】The effects of both on the accumulated infiltration of soil were analyzed based on the Hydrus-2D simulation of the wide ridge irrigation process of homogeneous soil under 5 different initial moisture content and pressure water head conditions.On the basis of the capacitive charging model,an empirical model of the infiltration volume and the infiltration time of the irrigation with wide ridges and furrows was established.【Result】With the increase of pressure head,the accumulated infiltration amount of soil under wide ridge and furrow irrigation increased,and decreased with the increase of moisture contents.The simulation value of the empirical model is close to the measured value of the verification test,and the simulation effect of the model is better.【Conclusion】Increasing the pressure head or decreasing the initial moisture content of the soil is beneficial to the increase of the accumulated infiltration in the irrigation of wide ridges and furrows.The established model of accumulated infiltration of wide ridge irrigation has great accuracy.

关 键 词：宽垄沟灌 累积入渗量 模型 Hydrus-2D 土壤 

分 类 号：S275.3[农业科学—农业水土工程]