A Method for Rapid Prediction of Atmospheric Dispersion of Air Pollutants Using Time Stack

A technology for air pollutants and atmospheric diffusion, which is applied in the field of air pollutant diffusion simulation, and can solve problems such as low calculation efficiency, large memory usage of meteorological data, and long calculation time

Active Publication Date: 2022-04-01
NORTHWEST INST OF NUCLEAR TECH
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Problems solved by technology

[0005] In order to solve the technical problems of the existing random walk method for simulating the diffusion of atmospheric pollutants, the meteorological data used in the simulation takes up too much memory, the calculation time is too long, and the calculation efficiency is very low. A Method for Rapid Prediction of Atmospheric Dispersion of Pollutants

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  • A Method for Rapid Prediction of Atmospheric Dispersion of Air Pollutants Using Time Stack
  • A Method for Rapid Prediction of Atmospheric Dispersion of Air Pollutants Using Time Stack
  • A Method for Rapid Prediction of Atmospheric Dispersion of Air Pollutants Using Time Stack

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Embodiment

[0093] In cooperation with the World Meteorological Organization, Global Nuclear Safety Consulting conducted two large-scale particle tracer experiments in Europe in 1994. This example takes the simulation of the first European particle tracer experiment as an example. The total amount of air pollutants released is 340kg; The outlet flow rate of pollutants is 7.98g / s; the release point is at 2° east longitude and 48° north latitude; the calculation time step is 1hr; the calculation cut-off time is 120hr; the calculation range is from 10° west longitude to 40° east longitude and north latitude 20°~70°; the recording grid is 0.1°×0.1°; the number of simulated particles is 10 6 The spatial resolution of meteorological data in the calculation is 1.125°×1.125°; the temporal resolution of meteorological data is 6hr.

[0094] In this embodiment, the flow chart of the method for quickly predicting the atmospheric diffusion of air pollutants by using time stacking is shown in figure ...

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Abstract

The invention provides a method for quickly predicting the atmospheric diffusion of air pollutants by using a time stack, which solves the problems of excessive memory occupation, long calculation time and low calculation efficiency in the existing random walk method for simulating the diffusion of atmospheric pollutants. The method includes the following steps: 1) Setting initialization conditions: number of simulated particles, cut-off time, calculation range, recording grid resolution and spatial distribution of pollution sources; 2) Sampling pollution sources; 3) Using time stack method to track the movement of simulated marker particles Trajectory, specifically, in each time step, calculate the position of all marked particles after a time step Δt, and store each particle information in the stack; after calculating all particle motions in a certain time step, according to the particle The dwell time gives the pollutant concentration value on each spatial grid at that moment; 4) According to the spatial concentration distribution of all grid points at different times, the spatiotemporal image of the concentration distribution of pollutants in the entire diffusion process is obtained.

Description

technical field [0001] The invention relates to a method for simulating the diffusion of air pollutants, in particular to a method for realizing rapid prediction of atmospheric diffusion of air pollutants by using time stacking. Background technique [0002] The atmosphere is one of the most basic environmental elements on which human beings depend. Its state and changes always affect human activities and survival. With the rapid development of industrialization and urbanization, air pollution has become a global social hazard. In addition, in recent years, the leakage and diffusion accidents of poisonous or radioactive gases have gradually increased, which have seriously affected people's lives and caused heavy losses to national property. Studying the diffusion of air pollutants in the atmosphere and evaluating the environmental impact caused by the diffusion of pollutants has positive significance for the real-time environmental consequence assessment and emergency decis...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01W1/10G06F17/11
CPCG01W1/10G06F17/11
Inventor 卓俊黄流兴朱金辉牛胜利商鹏李夏至
Owner NORTHWEST INST OF NUCLEAR TECH
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