排灌机械工程学报2024，Vol.42Issue(7)：709-719,11.DOI:10.3969/j.issn.1674-8530.23.0018
基于镜像原理的田间暗管排水流量计算方法
Calculation method of drainage flow in field subsurface pipe based on image method
摘要
Abstract
In view of the fact that there is no suitable method to calculate the drainage flow of con-cealed subsurface pipes that takes into account the influence of composite envelope materials at present,this paper combines the image method and the superposition principle of potential flow in seepage mechanics.A formula for calculating the drainage flow rate of concealed pipes considering the influence of outsourced filter materials was proposed under the background of winter irrigation and salt washing in Yinbei Irrigation District,Ningxia.The relevant hydraulic characteristic parameters were determined through indoor seepage tank tests and HYDRUS-2D software simulation.The experimental data,numerical simulation,and Numerov solution were compared and analyzed with the calculation formula in this paper.The results show that the relative errors between the formula calculated values and the seepage tank test data and numerical simulation values are within 7.00％and 2.05％respec-tively.When the thickness of the envelope material is less than 15 cm,the formulas in this article and the Numerov solution introducing the concept of effective radius both have a high degree of agreement with the simulated values.When the thickness of the envelope material is greater than 15 cm,the for-mula in this paper is closer to the numerical simulation value and better than the Numerov solution.The drainage flow rate of subsurface pipe gradually increases with the increase of the permeability coefficient or thickness of envelope material,but the growth rate gradually slows down.The formula for calculating the drainage flow rate of subsurface pipe composed of composite envelope materials based on the image method is reasonable and feasible,expanding the calculation concept of subsurface pipe drainage.关键词
暗管流量/外包滤料/镜像法/势流叠加Key words
subsurface pipe flow/envelope material/image method/potential energy superposition分类
农业科技引用本文复制引用
金铭锐,王红雨,李杰,马明泽,马俊毅,张广招..基于镜像原理的田间暗管排水流量计算方法[J].排灌机械工程学报,2024,42(7):709-719,11.基金项目
宁夏自然科学基金重点资助项目(2021A0609) （2021A0609）
国家自然科学基金资助项目(41462010) （41462010）
