摘要
基于在平潭海峡公铁两用大桥桥址处建立的风雨监测系统,对2018-08某热带低压条件下的风雨特征进行研究。研究结果表明:在降雨过程中,1 min平均风速变化较强烈,降雨后,平均风速较低;湍流强度在降雨过程中比降雨前显著增强;湍流积分尺度在降雨过程中离散度较大,均值与降雨前差别不大;湍流强度和湍流积分尺度与降雨强度、平均粒子直径的相关性不明显,但在平均粒子直径1 mm附近,湍流强度和湍流积分尺度都出现极值;在降雨过程中,实测的各分量脉动风速功率谱与经验谱间在高频段存在一定差异,实测谱在高频段高于经验谱。
A tropical depression sample in August 2018 was selected to study the wind and rain characteristics at the site Pingtan strait rail-cum-road bridge based on the established wind and rain monitoring system.The results show that the 1 min mean wind speed changes strongly during rainfall process,and it is low after rainfall.The turbulence intensity increases significantly during rainfall than before rainfall.In the process of rainfall,the dispersion of turbulence integral scale is large,and the difference of mean value between rainfall and the prerainfall is not significant.The correlation between turbulence intensity,turbulence integral scale and rainfall intensity,mean particle diameter are not obvious,but both present extreme values near the mean particle diameter of 1 mm.During the rainfall process,the measured power spectrum density(PSD)of the three fluctuating components of wind velocity is higher than that of the empirical spectrums in the high frequency band.
作者
何旭辉
汪震
严磊
任磊
郭辉
HE Xuhui;WANG Zhen;YAN Lei;REN Lei;GUO Hui(School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Laboratory for High Speed Railway Construction,Central South University,Changsha 410075,China;Railway Engineering Research Institute,China Academy of Railway Sciences,Beijing 100081,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第8期2081-2092,共12页
Journal of Central South University:Science and Technology
基金
中国铁道科学研究院集团有限公司基金资助项目(218YJ048)
国家自然科学基金资助项目(51808563,51925808)。
关键词
热带低压
风雨特征
公铁两用大桥
tropical depression
characteristics of wind and rain
rail-cum-road bridge
