Sensitivity Test of the Numerical Simulation with High Resolution Topography and Landuse over Seoul Metropolitan and Surrounding Areas

Abstract

The objective of this study is to evaluate the impact of the high resolution topographies and landuses data on simulated meteorological variables (wind speed at 10 m, temperature at 2 m and relative humidity at 2 m) in WRF. We compare the results with WRF simulation using each resolution of the topographies and landuses, and with 37 AWS observation data on the Seoul metropolitan regions. According to results of using high-resolution topography, WRF model gives better topographical expression over domain. And we can separate more detail (Low intensity residential, high intensity residential, industrial or commercial) using high resolution landuses data. The result shows that simulated temperature and wind speed are generally higher than AWS observation data. However, simulation trend with temperature, wind speed, and relative humidity are similar to observation data. The reason for that is that the high precipitation event occurred in CASE 1 and 2. Temperature have correlation of 0.43~0.47 and standard deviation of 2.12~2.28 o C in CASE 1, while correlation of more than 0.8 and standard deviation of 3.05~3.18 m s −1 in CASE 2. In case of wind speed, correlation have lower than 0.5 and Standard Deviation of 1.88~2.34 m s −1 in CASE 1 and 2. In statistical analysis shows that using highest resolution (U01) results are more close to the AWS observation data. It can be concluded that the topographies and landuses are important factor that affect model simulation. However, the tendency to always use high resolution topographies and landuses data appears to be unjustified, and optimal solution depends on the combination of scale effect and mechanisms of dynamic models.

Sensitivity Analysis of the High-Resolution WISE-WRF Model with the Use of Surface Roughness Length in Seoul Metropolitan Areas

“…또한 거칠기 길이는 바람장(풍향과 풍속), 운동량, 거칠기층, 경계층 고도, 난류 강도 등 대기의 흐름과 관련성이 높아 도시 경계층 연구에 적 용되었다 (Raupach, 1992;Grimmond and Oke, 1999 (Ratti and Richens, 1999;Priestnall et al, 2000;Ratti et al, 2006;Steiniger et al, 2008 (Landsberg, 1981;Grimmond and Souch, 1994;Voogt and Oke, 1997;Grimmond and Oke, 1999). 마찬가지로 국내에서는 지표면 거칠기에 대하여 연구가 진행되었으나 특정 지역에 제한적으로 수행되었다 (Lee and Park, 1997;Ha et al, 1998;Yoo et al, 2010;Yi et al, 2015 (Andréand Blondin, 1986;Hu et al, 2010;Wang et al, 2010;Salamanca et al, 2011;Cao and Lin, 2014;Park et al, 2015). 따라서 본 연구에서는 서울을 중심으로 구축된 고 해상도 지형고도, 지표이용도 그리고 지표면 거칠기를 이용하고 (Park et al, 2015;Yi et al, 2015 (Raupach, 1992;Macdonald et al, 1998;Dong et al, 2003;Ratti et al, 2006;Ng et al, 2011 (Landsberg, 1981;Ng et al, 2011…”

“…마찬가지로 국내에서는 지표면 거칠기에 대하여 연구가 진행되었으나 특정 지역에 제한적으로 수행되었다 (Lee and Park, 1997;Ha et al, 1998;Yoo et al, 2010;Yi et al, 2015 (Andréand Blondin, 1986;Hu et al, 2010;Wang et al, 2010;Salamanca et al, 2011;Cao and Lin, 2014;Park et al, 2015). 따라서 본 연구에서는 서울을 중심으로 구축된 고 해상도 지형고도, 지표이용도 그리고 지표면 거칠기를 이용하고 (Park et al, 2015;Yi et al, 2015 (Raupach, 1992;Macdonald et al, 1998;Dong et al, 2003;Ratti et al, 2006;Ng et al, 2011 (Landsberg, 1981;Ng et al, 2011…”