基于变水位静水法的梯形渠道渗漏强度函数构建及验证

变水位静水法受规范中观测方法限制,相邻2次观测时间段的计算只能代表平均水深的平均渗漏强度,且将观测期间渠道渗漏的非线性过程假设为线性变化,该假设将导致计算误差,从而使拟合的渗漏强度幂函数存在系统误差。该文以渠道内水位随时间的渗漏过程拟合函数为基础,建立了关于梯形渠道变水位静水法（dropping head ponding test,DHPT）的渗漏强度函数。以石津灌区6种梯形衬砌渠道的变水位静水法试验为依据进行实例分析,分析获得6种梯形渠道的传统幂函数和DHPT渗漏强度函数,并应用各函数进行了渗漏时长计算。通过渗漏时长计算值与实测值对比表明,DHPT函数平均估计误差0.978 h,最大相对误差...

Full description

Saved in:
Bibliographic Details
Published in农业工程学报 Vol. 33; no. 5; pp. 91 - 95
Main Author 柴春岭 苏艳娜 杨路华 刘宏权
Format Journal Article
LanguageChinese
Published 河北农业大学城乡建设学院,保定,071001%天津农学院水利工程学院,天津,300384 2017
Subjects
函数
变水位静水法
混凝土衬砌
渗漏
渠道
线性假设
混凝土衬砌
lined with concrete
linear variation
变水位静水法
canals
functions
渗漏
函数
dropping head ponding test
seepage
渠道
线性假设
Online AccessGet full text
ISSN1002-6819
DOI10.11975/j.issn.1002-6819.2017.05.013

Cover

More Information
Summary:变水位静水法受规范中观测方法限制,相邻2次观测时间段的计算只能代表平均水深的平均渗漏强度,且将观测期间渠道渗漏的非线性过程假设为线性变化,该假设将导致计算误差,从而使拟合的渗漏强度幂函数存在系统误差。该文以渠道内水位随时间的渗漏过程拟合函数为基础,建立了关于梯形渠道变水位静水法（dropping head ponding test,DHPT）的渗漏强度函数。以石津灌区6种梯形衬砌渠道的变水位静水法试验为依据进行实例分析,分析获得6种梯形渠道的传统幂函数和DHPT渗漏强度函数,并应用各函数进行了渗漏时长计算。通过渗漏时长计算值与实测值对比表明,DHPT函数平均估计误差0.978 h,最大相对误差为1.552%;而传统方法平均估计误差为3.997 h,最大相对误差为5.632%。表明DHPT函数能够更好地描述梯形渠道的渗漏过程,可用于计算点水深下的渗漏强度。通过DHPT函数与传统方法的计算结果对比,表明传统方法计算的渗漏强度普遍偏高,实例中平均误差达到0.248 L/（m^2·h）,而DHPT函数直接建立于观测数据之间的函数关系,可避免线性假设的影响,提高计算精度,为分析变水位工况下的渠道水利用系数提供依据。
Bibliography:Chai Chunling1, Su Yanna1, Yang Luhua2, Liu Hongquan1 （1. Institute of Urban and Rural Construction, Agricultural University of Hebei, Baoding 071001, China; 2. College of Water Conservancy Engineering, Tianjin Agricultural University, Tianjin 300384, China）
11-2047/S
seepage; canals; functions; dropping head ponding test; lined with concrete; linear variation
Dropping head ponding test is a typical method for canal seepage measurement, particularly under variable canal capacities during irrigation. This study analyzed the limitations of traditional method for seepage rate calculation and proposed a new method based on dropping head ponding test（DHPT）. Based on dropping head ponding test results and a standard method in Technical Code for Seepage Control Engineering on Canal, seepage rates were calculated, and a power function was established to describe the relationships between water-level and seepage rate. The standard calculation method had two inaccurate hypotheses. One was the linear variation of water-lev
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2017.05.013