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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第9卷    第3期    总第47期    2012年6月

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文章编号:1672-7029( 2012) 03-0068-04
修正的桥梁水害水位单位线预警方法研究
崔阳华1,雷明锋2

(1.中铁第四勘察设计院集团有限公司,湖北武汉430063; 2.中南大学土木工程学院,湖南长沙410075)

摘 要: 通过对常规的几种插值和拟合方法的原理对比分析,选取拉格朗日插值法和最小二乘曲线拟合法对桥梁水害水位单位线预警方法进行修正,提出修正的桥梁水害水位单位线预警方法,并给出具体的应用思路和实例分析。研究结果表明: 该法弥补了传统的水位单位线法预警过程中时间跨度大、预警时间和水位精确性低的缺陷,提高了桥梁水害灾情预警的可靠性和准确性,特别是使得无雨量观测资料的中小桥水害预警成为可能,具有较高的实用价值。

 

关键字: 桥梁; 水害预警; 水位单位线法; 拉格朗日插值; 最小二乘法

A modified unit hydrograph method for pre-warning water hazard of bridge
CUI Yang-hua1,LEI Ming-feng2

1.China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;
2.School of Civil Engineering,Central South University,Changsha 410075,China

Abstract:Through the comparative analysis of normal interpolation and fit methods,the Lagrange’s interpolation method and the least square curve fitting method were chosen to modify the unit hydrograph method for pre-warning water hazard of bridge.The modified unit hydrograph method was put forward and its application ideas and examples were given and analyzed.The results show that the method overcomes the defects of traditional unit hydrograph method in long time span and low accuracy of time and water level,so it enhances the reliability and accuracy of water hazard pre-warning,and the pre-warning for middle or small bridge without any rainfall observational data becomes possible.

 

Key words: bridge; water hazard pre-warning; unit hydrograph method; Lagrange interpolation; least squares method

ISSN 1672-7029
CN 43-1423/U

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