山区河道水面线和管涵漫水桥壅水计算探讨  

Discussion on Water Level Calculation of Rivers Course in Mountainous Area and Back Water of Pipe Culvert in Submersible Bridge

作　　者：杨扬[1] 韩凤霞[1] 刘军梅[1] 赵月芬[1] 

机构地区：[1]北京市水利规划设计研究院,北京100048

出　　处：《人民黄河》2013年第1期123-125,129,共4页Yellow River

摘　　要：对山区河道水面线和管涵漫水桥壅水的精确计算一直是防洪规划和咨询类项目中的一个重点及难点。利用HEC-RAS进行建模分析,对山区河道水面线计算中横断面数据设置的合理性和管涵漫水桥壅水计算中堰流系数、入口损失系数和管壁糙率三个参数的敏感性分别进行了探讨。在山区河道水面线计算方面,对局部河段尤其是急缓流流态变化和断面收缩扩大较剧烈的河段进行断面加密和适当修正处理明显有助于提高计算精度。进行管涵漫水桥壅水计算时,堰流系数、入口损失系数和管壁糙率对计算成果有重要影响。通过敏感性分析认为,堰流系数是影响计算结果最为敏感的参数。As the key point and difficulty in flood control planning and consultation,the refined water level calculation of rivers in mountainous area and back water of submersible bridge should be paid more attention.Base on HEC-RAS（US Army Corps of Engineers Hydrologic Engineering Center-River Analyse System）,the authors probed into the rationality of cross section setting about calculation of rivers in mountainous area and parameters sensitivity of weir coefficient,entrance loss coefficient and roughness in pipe shell in back water calculation of pipe culvert in submersible bridge.The results show that in order to model water surface in mountain stream accurately,interpolating cross sections between two surveyed cross sections and then appropriate adjustment to some parameter will be more helpful.For back water calculation of pipe culvert in submersible bridge,weir flow coefficient,entrance loss coefficient and roughness in pipe shell play sensitive effect,in which weir flow coefficient is the most sensitive parameter.

关 键 词：HEC-RAS 管涵 漫水桥 水面线 壅水 

分 类 号：TV131.4[水利工程—水力学及河流动力学]