| As one of the most common type of secondary disasters resulted by earthquake in mountainous area,earthquake landslide can cause much greater loss than that caused by the earthquake itself.The study of the susceptibility of earthquake landslide is not only applied in the quick distinguishing of seismic landslide,but also in providing decision basis for emergency rescue work.As well,it has certain directive significance to the post-disaster reconstruction,the land planning and the choice of infrastructure location.In our country there are about more than 95% of the earthquake disaster caused by the destruction of the building [5].136 cities are located in the earthquake area with seismic intensity 6 or more,accounting for about 45% of the total number of cities in our country [33].It is very important to vividly simulate the damage of buildings with different structure types in different seismic intensity in a city.Geographical information system(GIS)has powerful spatial data management,data processing and data analysis functions,but also has the advantages of visualization,three-dimensional display,the second development and so on.GIS plays an important role in seismic landslide hazard evaluation and 3D seismic disaster scene simulation,including data acquisition,processing,storage,spatial analysis,mathematical calculation and visual display,etc.CityEngine is a rapid 3D modeling tool which is perfectly compatible with ArcGIS software.It's biggest feature is batch modeling based on rules which is used to describe the object modeling process of change statement determines how model is generated.The work done in this paper is divided into two parts:1.Seismic intensity,slope,aspect,elevation,distance to water distance and distance to ruptured fault are selected as the seismic landslide impact factors.According to the six factors impact on the landslide of quantitative evaluation,using the analytic hierarchy process(analysis(AHP)model built seismic landslide prone evaluation index system,determine the weight of 6 kinds of influencing factors,and the establishment of earthquake induced landslide susceptibility evaluation mathematical model.Based on the GIS platform,the rapid evaluation module of seismic landslide is developed,which can obtain the distribution of the seismic landslide in the evaluation area within 1 hours after the earthquake.Finally by 2013 Lushan earthquake as an example,the earthquake in high intensity area eight counties as the study area,evaluation results and Lushan earthquake actual landslide data distribution is close.The reliability of the seismic landslide susceptibility model is verified,which can meet the requirement of the rapid assessment of the accuracy.2.The second part in 2008 Wenchuan earthquake hit area of the old town of Beichuan Qu town as the study area,first of all cityengine software to study area of 3D scene modeling based on,object modeling including terrain modeling,natural landscape modeling,building model and road and Bridge modeling.Those buildings,building 851,and each building has type structure,construction time,the number of layers and the fortification standards attributes.Then the seismic hazard prediction method,calculation of Beichuan County 851 buildings under different earthquake intensity(?-?)damage,and with different color display structures of different damage states.Finally,taking Beijing city as an example,we use this study to model the 3D modeling of Beichuan,and to complete the modeling of 50 thousand general buildings in Beijing city in 5 minutes.The feasibility of 3D modeling of CityEngine with high efficiency and rules is verified,and the simulation of 3D seismic damage scene based on CityEngine is feasible. |
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