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基于奇异矩阵分解法的河道糙率反演计算方法
引用本文:王玲玲,钟娜,成高峰.基于奇异矩阵分解法的河道糙率反演计算方法[J].河海大学学报(自然科学版),2010,38(4):359-363.
作者姓名:王玲玲  钟娜  成高峰
作者单位:1. 河海大学水利水电学院,江苏,南京,210098
2. 华东勘测设计研究院,浙江,杭州,310014
基金项目:国家杰出青年基金,国家自然科学基金,江苏省水利动力工程重点实验室开放基金 
摘    要:为了提高河道糙率计算的精度,在奇异矩阵分解法的基础上提出了河道糙率反演计算方法,并通过编程实现了算法.该算法以水位计算值与实测值在非恒定流整个计算时程中误差逐渐减小作为目标函数,并通过对计算域中测点值输出误差的不断迭代校正,达到求解目的.东江108km天然河道糙率率定结果表明,该河道糙率反演计算方法精度较高,可用于河道过流能力及复杂河网水动力模拟分析,可解决欠定的糙率率定问题并提高模型的实用性和洪水预报精度.

关 键 词:河道糙率  反演计算方法  奇异矩阵分解法
修稿时间:2010/8/30 0:00:00

Inverse calculation of bed roughness based on singular value decomposition method
WANG Ling-ling,ZHONG Na,CHENG Gao-feng.Inverse calculation of bed roughness based on singular value decomposition method[J].Journal of Hohai University (Natural Sciences ),2010,38(4):359-363.
Authors:WANG Ling-ling  ZHONG Na  CHENG Gao-feng
Institution:WANG Ling-ling1,ZHONG Na2,CHENG Gao-feng1(1. College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China,2. East China Investigation and Design Institute,Hangzhou 310014,China)
Abstract:In order to improve the accuracy of calculating bed roughness,an inverse calculation of bed roughness was proposed based on the singular value decomposition method. The relevant algorithms were realized by compiled programs. In the algorithms,the gradual reduction of errors between the calculated and measured water levels during the whole unsteady process was regarded as the objective function,and the solutions were obtained by continuous iteration and correction of the output errors of measured values in t...
Keywords:bed roughness  inverse calculation  singular value decomposition method  
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