Study on impact of SRTM based High-resolution Topography in Complex Coastal Area

An industrial complex specially located in coastal area seriously affect on air quality near residential area. Gwang-yang bay, where is the southern part of the Korean Peninsula, is one of the densely accumulated industrial areas. And air pollution over the area also increase with the density of industrial complex. Since petrochemical industry occupied major part of the Gwang-yang bay complex, so air pollutants associated with photochemical reaction are mainly emitted over the area. Photochemical ozone which is one of the major species of air pollutants, is regulated by the environmental authority and its regulation values is 100ppbv per 1hour. However ozone concentration over the area often exceed the regulation value. For this reason exact estimation of ozone concentration is necessary to prevent air pollution problems. Coastal area with complex terrain is often influenced by local wind such as land-sea breeze and mountain-valley wind. So air pollution over the area is also complicate because of complex wind system. Therefore, precise understanding of the impact of atmospheric circulation is important to predict the air quality in coastal area with complex terrain. Although the Automatic Weather System, AWS and Air Quality Monitoring Station, AQMS is now in operating routinely, it is difficult to analyse air pollution precisely because the horizontal resolution of observation data is unsuitable for estimation. Not only observation but numerical sinuation is one of the good equipments to analyse atmospheric impact on the estimation of air pollution in the Gwang-yang bay. Accuracy of atmospheric data is directly influenced on the estimation of air quality. So exact atmospheric information with high temporal and spatial resolution are required to predict precise air pollutants concentrations. Spatial resolution of USGS provided data is 30 arc second data. However the 30 arc resolution is not adequate to use for simulation over very complicate topography like the Gwang-yang bay area. Thus in order to impact of accuracy of topographic data on atmospheric circulation, numerical simulation with high and low spatial resolution are carried out. The high resolution of topography data used in this study is produced from the Shuttle Radar Topography Mission, SRTM by NASA, and its interval is 3 arc second(~90m). And low resolution is USGS 30 arc second(~900m) data.