????????????????????????????????????????????????????????????????????????????????????????????????? AERMOD

Abstract

This research studies the influence of terrain on the dispersion of total suspended particulates (TSP) emitted from an MDF manufacturing facility using the AERMOD dispersion model. Two case studies were conducted. Case Study 1 examined the effects of eight different terrain types defined in AERMOD on TSP dispersion. Case Study 2 analyzed the influence of terrain on TSP dispersion by dividing the land use proportions within the AERMOD model. The study area was in Patong Subdistrict Municipality, Hat Yai District, Songkhla Province, a region dominated by MDF manufacturing industries. Meteorological data were obtained from the Kho Hong Agrometeorological Station. In Case Study 1, eight distinct land use classifications available in AERMOD were evaluated. Results demonstrated that variations in terrain types significantly affected surface parameters, including albedo, Bowen ratio, and surface roughness length. Notably, surface roughness differed by up to 107.76% between �Coniferous Forest� and �Water� classifications, resulting in substantial differences in predicted TSP concentrations. In Case Study 2, land use segmentation was analyzed by dividing the study area into 2, 4, 6, 8, and 12 zones. The results indicated that finer segmentation altered the spatial distribution of TSP concentrations at receptor points. Model bias values for the respective segmentations were ?2.136, ?2.381, ?2.381, ?2.136, and ?2.659. While segmentation had a minimal impact on the maximum predicted concentrations, slight variations were observed in the minimum values. Among the tested configurations, the 2-zone and 8-zone segmentations yielded the closest agreement with the reference model based on statistical performance metrics.????????????????????????????????????????????????????????????????????????????????????????????????????????????????? AERMOD ????????????? 2 ????????? ??? ???????????? 1 ???????????????????????????????????????????????????????????????????????????? 8 ?????????????? AERMOD ??????????????? 2 : ?????????????????????????????????????????????????????????????????????????????????????????????????????????????? AERMOD ???????????????????????????????????? ???????????? ???????????? ?????????????????????????????????? MDF ???????? ????????????????????????????????????????????????????????? ????????????????? 1 ????? ???????????????????????????? 8 ?????? ???????????????????????????????????????? ?????????????????????????????? ?????? ??? Albedo, Bowen ratio ??? Surface roughness length ????????????????????????????? ????????????????????????? 107.761% ?????????????????????????????????????????????????????? ?????????????????????????????????????? ????????????????????????????????????????????????????????????????? ??????????????????????? 2 ????????????????????????????????????????????????????????????????????????? 2 ???? 4 ???? 6 ???? 8 ???? ??? 12 ???? ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? ????????????????????????????? Model bias ?????????????????????????????? -2.136, -2.381, -2.381, -2.136 ??? -2.659 ???????? ???????????????????????????????????????????????????????????????????????????????????????????????????? ??????????????????????????????????????????????????????????????????? ?????????????????????????????????????????????????????? 2 ??????? 8 ??????????????????????????????????????????????????????????????????????????????