波涌沟灌条件下土壤水分入渗室内试验研究

The Lab Experimental Study on Soil Water Infiltration under Surge Irrigation

根据波涌沟灌的水流特点和水分入渗特性,采用正交试验法对黄土高原沙壤土水平沟进行了水分入渗室内模拟试验.结果表明,沙壤土水平沟波涌灌溉的入渗率随周期数的增加而降低,但减渗效应主要取决于第2周期.已湿润的土壤表面,减渗层基本形成后,入渗率随供水时间的延长而减少、随停水时间的延长而增大;入渗开始后的1～5 min,水平侧渗和垂直下渗近似相等,湿润体剖面近似半圆形,随入渗时间延长,垂直下渗率越来越大于水平侧渗率.

In order to reduce soil erosion of surge trench irrigation in the loess plateau,and realize sustainable utilization of soil and water resources,this study carried out a series of indoor simulative experiment about typical soil of the Yellow River basin with orthogonal design methodology,according to the fluent characteristic and water infiltration properties of surge furrow irrigation,using SAS software and soil water dynamics theory to analysis the tentative statistical data.When the recycling rate unchanged,the test discovers that saving water effect on surge trench irrigation of the loess plateau essentially depends on the second pouring water cycle.After infiltration reduction layer have be formed,in the surface of moist soil.It gets the regression fomules for the infiltration rate of second perid with water supply time and shut down time;for the distance of water downward and lateral going with the time of infiltrating.The result of experiment may be as reference basis theory for sandy soil further or the promoted studies on level surge trench irrigation.