Journal of Geo-information Science >
Influence of DEM Spatial Resolution on the Simulation Results of Gas Diffusion Model
Received date: 2012-12-21
Revised date: 2013-03-31
Online published: 2013-08-08
Sudden gas leakage accidents which happened frequently threaten the security of the public heavily and brought great panic to the society. In order to provide great guidance for emergency departments to implement emergency rescue operations theoretically, it is necessary to discuss the model which is used to analyze the pollution of common gas leakage accident. Firstly, to adapt to simulating gas diffusion of the 3D terrain, based on the research and analysis of the typical gas leakage diffusion model, the terrain factors are introduced to refine the model in this thesis. Then the model is integrated with GIS, which has an advanced space displaying and spatial analysis ability, for analysis and comparison of gas concentration distribution acquired from the previous model and the improved one respectively. And on that basis, we made a further research on gas concentration distribution situation under the conditions of different DEM spatial resolutions, found that the improvement of DEM spatial resolution has some impact on the gas concentration distribution in 3D terrain conditions, and we analyzed the reasons of its effects. The results of the study reveal that the improved model is more accurate and closer to the real urban 3D terrain conditions. At the same time, the improvement of DEM resolution has a big impact on the simulation of the improved model. So, choosing an appropriate DEM resolution in the right time can help emergency services simulate th gas concentration distribution area more reasonable, reliable and timely, which has a certain practical reference value and guiding significance on gas leakage accident emergency.
Key words： gas leakage and diffusion model; DEM resolution; terrain factor; GIS
HE Gao-Feng, SUN Hai-Yan, WANG Xiao-Zui . Influence of DEM Spatial Resolution on the Simulation Results of Gas Diffusion Model[J]. Journal of Geo-information Science, 2013 , 15(4) : 527 -531 . DOI: 10.3724/SP.J.1047.2013.00527
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