道路交通对北京平原区沉降的影响

Influence of Road Traffic on Subsidence of Beijing Plain Area

为减少北京平原地区沉降灾害影响,提供北京平原区沉降灾害预警,基于北京平原地区的PS-InSAR时序监测结果(2003—2009年),采用ArcGIS进行空间插值分析,构建北京平原区沉降数据。空间上,选取北京主干道路进行空间缓冲分析,生成道路交通引起的沉降区域;时间上,选择2008年奥运会前后的典型时间段,定量分析了道路交通对北京平原区沉降的影响。研究结果表明,道路交通影响区占总沉降区50%以上,2008年奥运会后,这一占比最高达到87.81%;随着与道路距离的增大,沉降量减少;在北京平原区西南道路交通影响区域内,永定河冲积扇的扇中部和扇顶部,沉降量远小于扇缘区域。因此,道路交通是影响沉降的主要因素之一,并且是引起北京平原区沉降的外因。

In order to reduce the impact of subsidence disaster and provide early warning for the subsidence disaster in Beijing plain area,based on the PS-InSAR time series monitoring results(2003—2009)of Beijing plain area,spatial interpolation analysis was made by using ArcGIS to construct the settlement data of Beijing plain area.The main roads in Beijing were selected for spatial buffer analysis to generate the subsidence area;the typical periods before and after the 2008 Olympic Games were selected to quantitatively analyze the impact of road traffic on the subsidence of Beijing plain area.The results show that the road traffic influence area accounts for more than 50%of the total subsidence area,and after the 2008 Olympic Games,the maximum proportion is 87.81%;with the increase of the distance from the road,the subsidence decreases;in the southwest area of Beijing plain,the subsidence of the middle and top of the Yongding River alluvial fan is far less than that of the fan edge area in the road traffic impact area.Road traffic is the main influencing factor and the external cause of the subsidence of Beijing plain area.