Study On The Change Of Climate Conditions Affecting Highways

With the increase of world population,the continuous progress of science and technology and the forward development of economy,great changes have taken place in people's living environment and living environment.Since the 21 st century,global warming,sea level rise and extreme weather events caused by climate change have threatened the development of China's transportation industry.In addition,they have also laid great safety risks for people's lives and property.Therefore,according to the summary of the experience of climate change law,analysis of the process and impact of climate change conditions,the subject of the transport industry has a pivotal significance.Due to the lack of systematic analysis of the changes in climate indicators affecting highways,it is still unable to meet the needs of practice.Therefore,this paper is divided into three aspects to introduce the changes of climate evaluation indexes affecting highways,namely,temperature process,precipitation process and water temperature combination process.Among them,temperature process includes more than 20? accumulated temperature and freezing index,precipitation process includes precipitation in non-freezing period and freezing period,water-temperature combination process includes precipitation accumulated temperature combination index,precipitation frozen combination index and precipitation temperature combination index.First of all,the daily data of temperature and precipitation from 1950 to 2011 were collected from 739 meteorological stations in China.Then,the specific values of each climate element and the index values used later were programmed and calculated by SAS software according to the index definitions.Secondly,the trend of time and the characteristics of space change are used to analyze the change of the climate evaluation index affecting the highway.The time change trend analysis adopts the methods of annual change trend,anomaly and linear regression.The analysis of spatial change features uses ArcGIS to draw the contour map of the average annual change amount and average annual change rate of each climate element in China,and analyzes the change situation of each climate element in various aspects.Finally,according to the regional characteristics of climate spatial change characteristics,selected typical meteorological stations in each specific region to analyze the climatechange situation between different regions.In this paper,it is shows that the impact of climate change on highway construction in China,which can be used as a reference significance for the construction of road transportation industry considering climate change.