Simulation of radionuclides dispersion under dirty bomb attack with complex street geometry

doi:10.16265/j.cnki.issn1003-3033.2018.09.023

Abstract

Abstract: This paper takes a real block as the study area, simulating the radionuclides dispersion under adirty bomb attack in this block based on the Euler numerical model. Then features of the radionuclides dispersion with complex street geometry and different wind field conditions are examined and concluded. Results show that the radiological risk grows up with the increase of wind speed when it is under 20 m/s with the same wind direction, that when wind speed is 10 m/s, the sum of the radiological risk reaches the maximum value at the exits downwind while it is minimum if the wind speed is 6 m/s, that higher wind speed witnesses more significant influence of the street complexity on the radionuclides dispersion, that the radionuclides near the source is easy to form a large high-concentrated area and present a Gaussian distribution if the wind speed is slower than 2 m/s, that in circumstance of dirty bomb attacking, staying in the downwind area near the buildings, as well as the areas with densely or open circular buildings should be avoided, and evacuating from the adjacent exits should also be forbidden.

Key words: complex street geometry, dirty bomb, terrorist attacks, numerical simulation, Euler model, emergency

CLC Number:

X928.9
TL7

ZHENG Chaohui, WU Jiansong, HU Xiaofeng, HOU Yi, HOU Miaomiao, QIU Lingfeng. Simulation of radionuclides dispersion under dirty bomb attack with complex street geometry[J]. China Safety Science Journal, 2018, 28(9): 134-141.

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