| บทคัดย่อ(English) |
The applicability of the Atmospheric Dispersion Modelling System (ADMS) for use in Thailand was studied. Model sensitivity was studied, along with behaviour in meteorologically representative and extreme conditions. A comparative study was made with the Industrial Source Complex model (ISC), an accepted standard in Thailand, using identical input data. The model sensitivity to meteorological parameter was greatest during the day time. The greatest sensitivity was to surface wind speed, especially at low surface wind speeds, typical of Thailand, with a strong correlation to boundary layer height predictions. The model was insensitive to surface relative humidity. Down wind predictions of ground level concentration and deposition generally decreased with increasing distance and surface wind speed. In extreme meteorological conditions, some predictions were less clear. Maximum predictions of ground level concentration and deposition occurred under low surface wind speed and high cloud cover conditions. The ADMS model generally predicted lower ground level concentration than the ISC model, but higher deposition. The ADMS model sensitivity was generally greater than the ISC model during the day, but less at night. Boundary layer height, or Maximum Mixing Depth (MMD), predictions were generally lower than those of the ISC meteorological processor programme, PCRAMMET; both being generally lower than empirical values. In the long term run, the ADMS model predictions showed a much greater correlation with predominant wind directions than the ISC model. From comparison with the ISC model in previous studies, and those of this study, combined with its user flexibility, it was considered that the ADMS model was better suited for use in Thailand than the ISC model. |
