微地形、微气候特性对高速公路选线的影响

Influence of Micro-topography and Micro-climate Characteristics on Highway Route Selection

文章通过分析某高速公路走廊带高、低两个线位方案的微地形条件对微气候条件的影响,同时结合区域水文地质特征,分析出高、低线位两个方案在路段风速、环境温度、地下水影响程度等方面存在较大差异,研究结果表明在复杂地形条件下,气象条件对山区高速公路的影响日趋显著。地形相对开阔路段,以自然风为主,风速相对较小,日照时间较长,受地下水影响较小,高速公路路面冬季不易结冰;地形狭窄区域,在狭管效应作用下,路段风速明显增大,日照时间较短,受地下水影响较大,高速公路路面在冬季低温条件下易结冰,威胁行车安全。本研究对山区高速公路选线具有参考价值。

This paper analyzed the impact of the micro-topography conditions on the micro-climate conditions of the high and low line plans of a certain highway corridor. Combined with regional hydrogeological characteristics, it is analyzed that there are big differences between the high and low line levels in terms of road section wind speed, environmental temperature, and groundwater impact. It is concluded that under complex terrain conditions, the impact of meteorological conditions on highways in mountainous areas is becoming more and more significant. When the terrain is relatively open, it is dominated by natural wind and the wind speed is relatively small, the sunshine time is long, and the influence of groundwater is small, the highway surface is not easy to freeze in winter. In the narrow terrain, under the narrow pipe effect, the wind speed of the road section increases obviously, the sunshine time is short, and it is greatly affected by the groundwater. So, the highway pavement is easy to freeze under the condition of low temperature in winter, which threatens driving safety. The conclusion provides important references for the highway route selection in mountainous areas.