Abstract:

In this paper，using the transport network density，traffic impacts on the level of trunk and location advantages，30 counties (districts) of the heavy disaster area of Wenchuan Earthquake were selected to analyze traffic accessibility in preearthquake，and provide reference for the reconstruction of the heavy disaster area.The data show that Fucheng District of Mianyang City gets the highest traffic accessibility.The lowest is in Songpan County，which is only 1/5 of that in Fucheng District.So there is a significant gap among counties.The analysis indicates that there is great diversity in the spatial distribution of traffic accessibility in the heavy disaster areas with a trend of decreasing from the center of the city to its periphery，also from the plain area to the plateau region.Those regions with traffic main trunk line have higher traffic accessibility than other places.The traffic accessibility of this area is characterized by the strap configuration.By analyzing the relation of economic development and traffic accessibility in this area，it is found that the economic development levels in the heavy disaster areas have something to do with the spatial distribution diversity there.That is，the area with higher economic development level the traffic accessibility is higher，and vice versa.From a quantitative view，a remarkable exponential function relationship is also found between the economic development level and traffic accessibility.

Key words: Wenchuan Earthquake/ heavy disaster area/ traffic/ accessibility