支沟堰塞湖溃决引发主河洪水计算方法研究
发布时间：2018-07-29 09:19
【摘要】：支沟冰碛堰塞湖溃决洪水是我国铁路、高速公路建设未应对过的新风险,此外,西藏地区的河道还往往具有宽窄相间的复杂形状,直接应用洪峰展平法计算溃决洪水的演进过程误差过大。通过水槽实验,发现由于支沟溃决洪水入汇主河时分流扩散、到达河道突缩段时因流态紊乱导致局部阻力损失增大,洪峰流量和水深在汇口和突缩段均出现明显衰减。针对上述的衰减现象,对李斯特万公式和谢任之公式进行修正,在原式基础上添加了折减系数以适用于复杂情况下的洪水计算。经米堆冰湖溃决案例检验表明:修正后的公式精度明显提高,可作为一种与铁路、公路选线原则方案确定阶段精度要求相匹配的溃决洪水风险快速评估方法使用。
[Abstract]:The outburst flood of Zhigou moraine dammed lake is a new risk in China's railway and highway construction. In addition, the rivers in Tibet often have a complex shape of width and narrow. The error of direct application of Hong Feng flattening method in calculating the course of outburst flood is too large. Through the flume experiment, it is found that when the branch ditch collapses into the main river, the local resistance loss increases due to the disturbance of the flow pattern, and the Hong Feng discharge and the water depth decrease obviously at the Huikou and the sudden contraction section. In view of the above attenuation phenomenon, the Listevan formula and the Xie Ren formula are modified, and the reduction coefficient is added to the original formula to apply to the flood calculation under complex conditions. The result of the case study shows that the modified formula can be used as a fast assessment method of outburst flood risk, which can be used in accordance with the precision requirement of railway and highway route selection principle.
【作者单位】： 西南交通大学土木工程学院;抗震工程技术四川省重点实验室道路与铁道工程抗震技术研究所;高速铁路线路工程教育部重点实验室;
【基金】：中国铁路总公司科技研究开发计划课题(2013G014-A-3、2014G004-A-6) 国家自然科学基金重点项目(41030742)
【分类号】：TV122
本文编号：2152225
[Abstract]:The outburst flood of Zhigou moraine dammed lake is a new risk in China's railway and highway construction. In addition, the rivers in Tibet often have a complex shape of width and narrow. The error of direct application of Hong Feng flattening method in calculating the course of outburst flood is too large. Through the flume experiment, it is found that when the branch ditch collapses into the main river, the local resistance loss increases due to the disturbance of the flow pattern, and the Hong Feng discharge and the water depth decrease obviously at the Huikou and the sudden contraction section. In view of the above attenuation phenomenon, the Listevan formula and the Xie Ren formula are modified, and the reduction coefficient is added to the original formula to apply to the flood calculation under complex conditions. The result of the case study shows that the modified formula can be used as a fast assessment method of outburst flood risk, which can be used in accordance with the precision requirement of railway and highway route selection principle.
【作者单位】： 西南交通大学土木工程学院;抗震工程技术四川省重点实验室道路与铁道工程抗震技术研究所;高速铁路线路工程教育部重点实验室;
【基金】：中国铁路总公司科技研究开发计划课题(2013G014-A-3、2014G004-A-6) 国家自然科学基金重点项目(41030742)
【分类号】：TV122
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