复杂地形下铁路峡谷交汇处风速分布规律及测风站选址建议OA

To enhance railway transportation safety in confluent canyon regions under strong wind conditions,a typical section of complex terrain along the Southern Xinjiang Railway was taken as an example and the Realizable k-ε turbulence model was adopted to numerically simulate the wind speed distribution near the canyon confluence.By analyzing the characteristics under different incoming wind directions,the relationships between wind speeds from individual canyons were investigated.Based on these findings,recommendations were proposed for siting anemometer stations and bridges in such areas,clarifying applicable conditions for bridges spanning either both upstream canyons or the confluence directly.A lateral positioning method for anemometer stations was established using the"wind direction frequency-weighted average of normalized wind speed"as an indicator.The results show that the alignment between the incoming wind direction and the canyon orientation is the main factor affecting the wind speed distribution.When they align closely,the wind speed inside the canyon is higher and the flow is stable;otherwise,it is lower and more turbulent.Specifically,if the incoming wind direction aligns with one upstream canyon,the wind speed at the confluence is 0.943 4±0.011 7 times that in that canyon.If it differs significantly from both upstream canyon orientations,the confluence wind speed is higher and mainly controlled by the upstream canyon with the stronger wind.For the studied topography,the recommended stations in the two upstream canyons and at the confluence should be positioned at 0.60,0.55,and 0.25 times the canyon width from the windward side,respectively.This layout increases observed wind speed by 19.8%and reduces monitoring error from 17.4%to 1.1%compared to the existing stations.The outcomes provide theoretical and engineering references for windproof design of railways in complex terrain.