Determination of Urban Surface Aerodynamic Characteristics Using Marquardt Method
Determination of Urban Surface Aerodynamic Characteristics Using Marquardt Method
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DOI：
10.12989/was.2009.12.3.281
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发表时间：
2009-05
影响因子：
1.6
通讯作者：
Ning Zhang;Wei-mei Jiang;Zhiqiu Gao;F. Hu;Zhen Peng
中科院分区：
文献类型：
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作者：
Ning Zhang;Wei-mei Jiang;Zhiqiu Gao;F. Hu;Zhen Peng
中国用马夸特方法估算了北京市区的空气动力学参数，包括位移长度(D)、粗糙度长度(U)、摩擦速度(u*)和阻力系数。用摩擦风速与平均风速之比定义的地表阻力系数为0.125，接近城市地区的典型数值。D和d的平均值分别为1.2m和7.6md，由于城市地表的非均质性，d和d随方向变化，并在S西南段达到最大值，这一趋势与观测塔周围的地表粗大元素分布相一致。
Marquardt method is used to estimate the aerodynamic parameters in urban area of Beijing City, China, including displacement length (d), roughness length () and friction velocity (u*) and drag coefficient. The surface drag coefficient defined as the ratio between friction velocity and mean wind speed is 0.125 in our research, which is close to typical urban area value. The averaged d and are 1.2 m and 7.6 m. d and change with direction because of the surface heterogeneity over urban surface and reach their maximum values at S-SW sector, this tendency agrees with the surface rough element distribution around the observation tower.