As one of the prediction models recommended by “Technical Guidelines for Environment Impact Assessment - Atmospheric Environment” (HJ 2.2-2008) and USEPA, AERMOD has been widely used in environment impact assessment and other fields domestically and internationally. The AERMOD model has been used in environment impact assessment of NO2, dispersion and migration of dioxin in waste incineration plants, health risk assessment of pollutants from coal-fired power plants, determination of emission factor for hydrogen sulfide, scenario simulation of SO2 in Kunming industrial park, diffusion analysis on PM10, atmosphere protection distance in steel enterprises, etc.
AERMOD is steady-state plume model, including 3 modules: AERMOD (Dispersion Module), AERMET (Meteorological Data Pre-processing Module), and AERMAP (Terrain Pre-processing Module). By importing surface parameters (surface roughness, albedo, Bowen ratio) and terrain data, this model can calculate the diffusion of pollutants in complex terrain conditions. And the roughness is an important variable to determine the size of the mechanical turbulence; the albedo indicates the ratio of the solar radiation reflected by surface; and Bowen ratio is the ratio of the sensible heat flux to the latent heat flux. These 3 parameters are critical bases for calculating planetary boundary layer and has important impact on model prediction result. However, for most domestic projects, surface parameters were usually selected by manual judgement. The surface parameters judged by different people will have certain differences, which lead to the deviation of the prediction results, and not conducive to the standardized application of the model.
This system aims to solve the problems and needs in AERMOD model application for the assessment of atmospheric environmental impact. Based on national high-resolution land use data, GIS geographic information system, AERSURFACE surface parameter processing module, the AERSURFACE online service system is established with standardization and automation. It is a national online calculation and management system for surface parameters, which provides support and reference for the standardized application of AERMOD model.
The technical support and management unit information of this system is shown in Table 1. The online computing and management process are shown in Figure 1 (download application manual and technical report).
Table 1: Information Sheet of System Technical Support and Management Unit
Appraisal Center for Environment and Engineering, MEP
Before using the data products provided by AERSURFACE online service system, the users need to fill in the registration information online and submit a registration application to AERSURFACE model team. Fill in application form and accept all terms of the user agreement, and then print out the application form, stamp it with official seal of organization, and mail it to the office of AERSURFACE team. The system administrator will review the registration application and assign the user permission if the application is approved.
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