Journal of Environmental Impact Assessment (환경영향평가)

Korean Society of Environmental Impact Assessment (한국환경영향평가학회)
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A Study on Improvement of Air Quality Dispersion Model Application Method in Environmental Impact Assessment (I) - Focusing on AERMOD Meteorological Preprocessor -

환경영향평가에서의 대기질 확산모델 적용방법 개선 연구(I) - AERMOD 기상 전처리를 중심으로 -

  • Received : 2022.05.29
  • Accepted : 2022.09.16
  • Published : 2022.10.31
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Abstract

The AERMET, the AERMOD meteorological preprocessing program, mainly used for environmental impact assessment and Integrated Environmental Permit System (IEPS) in Korea, has not considered the land covers characterasitics, and used only the past meteorological data format CD-144. In this study, two results of AERMET application considering CD-144 format and ISHD format, being used internationally, were compared. Also, the atmospheric dispersion characteristics were analyzed with consideration of land cover. In the case of considered the CD-144 format, the actual wind speed was not taken into account in the weak wind (0.6~0.9m/s) and other wind speed due to the unit conversion problem. The predicted concentration considering land cover data was up to 387% larger depending on the topographic and emission conditions than without consideration of land cover. In conclusion, when using meteorological preprocessing program in AERMOD modelling, AERMET, with ISHD format, land cover characterasitics in the area should be considered.

본 연구에서는 AERMOD 기상 전처리 프로그램인 AERMET에 대표적 지표기상 형식인 CD-144와 ISHD를 적용하여 처리 결과를 비교하고, 환경부 토지피복도를 고려하여 대기확산 정도를 분석하였다. 연구결과, knot 단위를 사용하는 CD-144 형식의 경우 단위 변환 오차로 인해 실제 풍속을 고려하지 못하였으나 ISHD 형식은 그대로 반영하는 것으로 나타났다. 점오염원 1시간 최대 농도값은 ISHD가 CD-144에 비해 높았으며, 그 외에는 동일하거나 낮아지는 것으로 나타났다. 환경부 토지피복도를 반영한 농도값은 토지피복도를 고려하지 않은 경우보다 최대 387% 증가하였으며, 등농도곡선 형태(곡선의 방향 및 길이)에도 차이가 있는 것으로 나타났다. 환경영향평가 및 통합환경허가에서의 모델 사용은 동일한 조건에서의 통일된 판단을 요구하므로 AERMET 사용시 ISHD 형식의 사용과 함께 모델링 지역의 토지피복을 고려할 필요가 있다.

Keywords

Acknowledgement

본 결과물은 환경부의 재원으로 한국환경산업기술원의 한국보건디지털 조사기반 구축기술개발사업의 지원을 받아 연구되었습니다(2021003330003).

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