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KMID : 1024520160250121597
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Journal of the Environmental Sciences
2016 Volume.25 No. 12 p.1597 ~ p.1611
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Numerical Study on the Changes in Microscopic Meteorological Elements due to Land Use Variations in the Nakdong River Basin
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Kim Eun-Ji
Lee Soon-Hwan
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Abstract
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A numerical assessment using mesoscale-CFD (computational fluid dynamics) coupled A2C (atmosphere to CFD) model was carried out to analyze the variation of microscopic air flow pattern due to the construction of the Chilgok barrage in the Nakdong River. Scenarios with air flow patterns were classified into pre- and post-construction. The increased width of the river due to the construction of the Chilgok barrage induced obvious changes in moisture and the thermal environment around the river. However, air temperature variation was restricted within an area along the windward side in the numerical assessment. The impact of barrage construction on air temperature tends to be stronger during the nighttime than the daytime. It also stronger during the winter than the summer. In the simulation, the convergence of mesoscale wind is more pronounced after barrage construction than before. This is caused by the change of heat flux pattern induced by the widening of the river. Although this work is a case study with restricted atmospheric stability conditions that has several limitations in the numerical simulations, the impacts of the land-use changes brought about by the construction of the barrage in the river acceptable.
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KEYWORD
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A2C, Mesoscale-computational fluid dynamics, Local weather phenomena, Nakdong river, Numerical modeling
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