Leaking gas diffusion forecasting method used for three-dimensional space

Abstract

The invention provides a leaking gas diffusion forecasting method used for a three-dimensional space. By constructing a spatial three-dimensional coordinate system with the method, a leaking area and a surrounding area are expressed in the same coordinate system, other terrain and building distribution data are loaded in a computational domain of a fixed area in the coordinate system so as to conduct leaking gas diffusion simulation, on the basis, toxic gas diffusion forecasting outside the computational domain of the fixed area is carried out, so as to realize leaking gas diffusion concentration distribution forecasting of the surrounding area of a leaking source. The leaking gas diffusion forecasting method sufficiently considers geographic information then and there when carrying out the diffusion forecasting to the leaking gas, and can rapidly work out the range of a polluted area caused by one or multiple leaking sources and the toxic gas concentration in the polluted area.

Description

technical field [0001] The invention relates to the field of gas diffusion prediction. Background technique [0002] In February 2006, the State Council issued the "National Medium- and Long-term Science and Technology Development Plan (2006-2020)", listed "public safety" as a key area, and clearly proposed the development of emergency rescue technology for hazardous chemical leakage, nuclear, biological and chemical terror sources remote detection technology, etc. In March 2011, Premier Wen Jiabao of the State Council signed the State Council Order to announce the revised Regulations on the Safety Management of Hazardous Chemicals. The dangerous chemicals involved in the regulations, especially the leakage of toxic gases, can quickly spread several kilometers away under the action of wind, causing large-scale poisoning, causing harm to human body, facilities, environment, etc., and even permanent sexual harm. Therefore, while controlling the source of the leak, it is nec...

AI Technical Summary

Problems solved by technology

At present, many applications use the Gaussian model or its improved model, but due to the complex actual environment, especially the geological environment (for example, most of the actual diffusion areas have undulating terrain, various types of buildings and other terrain factors) and the number of leakage sources, etc. actual predictive effect

[0004] In 2009, Fan et al. (Fan L, Yi S, Li Z, et al. Research on toxic Gas Diffusion Simulation in Urban areas based on GIS. New Trends in Information and Service Science, NISS′09. International Conference on. IEEE, 2009 :166-169) used the improved Gaussian model to simulate the gas diffusion in the urban area, and achieved a certain accuracy, but it has strict requirements on the diffusion prediction efficiency and input conditions, which will be limited in practical applications; at the same time, it has not considered The impact of 2 or more leakage sources at the same time

In 2011, Stockie (Stockie J M. The mathematics of atmospheric dispersion modeling. Siam Review, 2011, 53(2): 349-372) reproduced the derivation process of the Gaussian model, and obtained different results according to different physical assumptions , but still does not consider the influence of the spatial three-dimensional topography and the number of leakage sources, etc.

In general, the performance of the Gaussian model is not ideal for the prediction of multi-leakage source diffusion concentration values ​​in high-density built-up areas with complex geometric features and high relief terrain conditions

[0005] In 2011, Huang Hong et al. proposed a simulation method of gas diffusion around buildings based on the coupling of Lagrangian model and Eulerian model (Huang Hong, Hu Xiaofeng et al., Simulation of gas diffusion around buildings based on coupling of Lagrangian model and Eulerian model, Journal of Tsinghua University (Natural Science Edition), 2011, 51(12):1870-1876), but this method does not involve the high relief terrain conditions and the diffusion of multiple leakage sources. This method is mainly suitable for the prediction of atmospheric diffusion around urban buildings

[0006] With the improvement of computer computing performance, methods based on computational fluid dynamics models have been greatly developed (Zajaczkowski F J, Haupt S E, Schmehl K J.A preliminary study of assisting numerical weather prediction data into computational fluid dynamics models for wind prediction. Journal of Wind Engineering and Industrial Aerodynamics, 2011, 99(4):320-329), and has become the main trend in the study of leakage gas diffusion in recent years, but because the computational fluid dynamics model needs to discretize the plane and space, despite the improvement of computing performance, However, it is very difficult to realize the prediction of toxic gas diffusion in a large area, especially in high relief terrain (compared to flat and flat three-dimensional terrain, high relief terrain conditions will cause a sudden increase in the computational domain space), the main reason is that the entire area of ​​interest Modeling calculation, which undoubtedly increases the difficulty of solving, reduces the efficiency of diffusion solution, and is not conducive to practical application

Images