不同压力下新型地下灌水器流量及湿润锋变化  

Changes of Flow Rate and Wetting Front of New Type Underground Irrigator Under Different Pressure

作　　者：古俊飞 马海燕[2] 徐立荣 黄乾[2] GU Jun-fei;MA Hai-yan;XU Li-rong;HUANG Qian(University of Jinan,College of Water Resources and Environment,Jinan 250022,China;Water Resources Research Institute of Shandong Province,Jinan 250013,China)

机构地区：[1]济南大学水利与环境学院,济南250022 [2]山东省水利科学研究院,济南250013

出　　处：《节水灌溉》2024年第6期35-39,45,共6页Water Saving Irrigation

基　　金：山东省重点研发计划项目(2023CXGC010905);水利部重大科技项目(SKS-2022052);山东省重点研发计划项目(2022CXGC020707)。

摘　　要：为探究压力对地下滴灌管渗水性能的影响,针对一种新型地下灌水器进行了不同工作压力下(0.02~0.18 MPa)自由出流的水力性能测试及0.02 MPa、0.05 MPa 2种压力条件下的室内土箱入渗试验,分析灌水器变异系数、流态指数及灌水均匀度随压力的变化规律以及入渗湿润锋运移规律。结果表明:自由出流条件下,灌水器流量变异系数为0.01,压力与流量关系式为q=6.54917 h^(0.521);流态指数x为0.521,灌水器对压力变化的敏感度较高;灌水均匀度系数均大于0.8。室内土箱入渗试验时,相同灌水器埋深下,压力越大,湿润锋运移速度越快,等时间内所形成的湿润体体积也越大,湿润锋在各方向水分运移距离与时间呈幂函数关系。In order to explore the influence of pressure on the seepage performance of underground drip irrigation pipes,hydraulic performance test of free flow under different working pressures(0.02~0.18 MPa)were conducted.Addtionally,the infiltration test of indoor soil box under two pressure conditions were carried out for a new type of underground irrigation pipe.The variation coefficient of irrigator,flow pattern index and irrigation uniformity with pressure and the migration law of infiltration wetting front were analyzed.The results show that under the condition of free discharge,the variation coefficient of discharge is 0.01.The relation between pressure and discharge is:q=6.54917 h^(0.521).The flow index,denoted as x,is 0.521,and the sensitivity of the irrigator to pressure change is higher.Irrigation uniformity coefficient is greater than 0.8.Under the same embedment depth,increasing the pressure leads to a higher migration rate of the wetting front and a larger volume of the wetted zone formed within the same timeframe.The wetting front is a power function of the distance and time of water migration in each direction.

关 键 词：地下灌水器 不同压力 湿润锋 控制变量法 流量 水分运移 

分 类 号：S275[农业科学—农业水土工程]