关键词: 重构聚落, 地质灾害, 灾情评价, 北川羌族自治县

Abstract: Beichuan Qiang Autonomous County was the very seriously destroyed area during the 2008's earthquake, with all kinds of urban and rural buildings greatly damaged because of the earthquake. The region's settlement space has been rapidly reconstructed during the post-disaster reconstruction of three years. However, the natural environment is not yet stable, coupled with the frequency of extreme weather events in recent years, a number of potential threats gradually were exposed, causing a number of catastrophic events in the settlement space of reconstruction after the earthquake. Particularly, the geological disasters broke out in Beichuan after the 7.9 flood disaster in 2013, causeing serious security threat to the settlement space of reconstruction. In this paper, the census data of disaster after the 7.9 flood disaster in 2013 and land use data of Beichuan were selected to analyze and evaluate the characteristics of geological hazard of the settlement space in Beichuan based on GIS technology, the nearest neighbor method and the principal component analysis method. Eventually, we calculated the disaster index of various settlement plaques, and divided them into four grades based on the size of the disaster index value as follows: mild, heavy, serious and very serious. The evaluation results showed that a total 1016 settlement patches are threatened by geological disasters points in the Territory of Beichuan County, accounting for 5.7 percent of the total settlement plaques. Among them, there are 45 settlements are very seriously destroyed by geological disasters and 64 settlements are seriously destroyed by geological disasters, 775 settlements are heavily destroyed by geological disasters, and 132 settlements are slightly destroyed by geological disasters. The evaluation results can provide a fundamental basis for local government to develop a scientific decision to disaster prevention and mitigation according to the disaster priorities of each affected settlements.

Key words: reconstruction settlement, geological disasters, disaster evaluation, Beichuan Qiang Autonomous County