指数律参数选取对指数和廓线精度的影响
发布时间：2018-10-13 12:19
【摘要】：基于广州市主城区水平比例尺为1∶7 000和垂直比例尺分别为1∶500、1∶1 000、1∶2 000的三维建筑模型,在B类边界层中性流条件下进行风洞模拟.利用26个测点、15个高度的西北和东南盛行风况下的风速数据,分析指数律参考高度zref、零平面位移d和采样厚度t等3个参数对指数α和拟合精度的不确定性影响,并为指数律应用中精度的提高提供了相应的建议.实验结果表明:参考测点最高高度α的均值和离散度相对较小,且拟合较为理想;d的引入能提高拟合精度,且与α呈负相关;不考虑零平面位移d的指数律对下垫面非均质、测点众多的研究更为实际;不同粗糙程度的下垫面,α在0.25~1 H廓线厚度段内收敛,0.25~1 H是理想的采样厚度.
[Abstract]:Based on a 3D building model with a horizontal scale of 1:7 and a vertical scale of 1: 500: 1 000 to 1: 2 000 in the main urban area of Guangzhou, wind tunnel simulation is carried out under the condition of neutral flow in class B boundary layer. Using the wind speed data of 26 measuring points and 15 heights in the prevailing wind conditions in northwest and southeast of China, the uncertain effects of three parameters, such as zref, zero plane displacement d and sampling thickness t, on the index 伪 and fitting accuracy are analyzed. Some suggestions are provided for the improvement of precision in the application of exponential law. The experimental results show that the mean value and dispersion of the maximum height of the reference point 伪 are relatively small and the fitting is ideal, the introduction of d can improve the fitting accuracy and is negatively correlated with 伪, and the exponential law of zero plane displacement d is not considered for the heterogeneity of the underlying surface. The study of many measuring points is more practical, and for the underlying surface with different roughness, 伪 converges in the thickness of 0.25 ~ 1H profile, and 0.25 ~ (-1) H is the ideal sampling thickness.
【作者单位】： 华南师范大学地理科学学院;广东省建筑科学研究院集团股份有限公司风工程研究中心;
【基金】：国家自然科学基金项目(41771001) 广州市科技计划项目(201704020136)
【分类号】：P425.6;TU14
本文编号：2268602
[Abstract]:Based on a 3D building model with a horizontal scale of 1:7 and a vertical scale of 1: 500: 1 000 to 1: 2 000 in the main urban area of Guangzhou, wind tunnel simulation is carried out under the condition of neutral flow in class B boundary layer. Using the wind speed data of 26 measuring points and 15 heights in the prevailing wind conditions in northwest and southeast of China, the uncertain effects of three parameters, such as zref, zero plane displacement d and sampling thickness t, on the index 伪 and fitting accuracy are analyzed. Some suggestions are provided for the improvement of precision in the application of exponential law. The experimental results show that the mean value and dispersion of the maximum height of the reference point 伪 are relatively small and the fitting is ideal, the introduction of d can improve the fitting accuracy and is negatively correlated with 伪, and the exponential law of zero plane displacement d is not considered for the heterogeneity of the underlying surface. The study of many measuring points is more practical, and for the underlying surface with different roughness, 伪 converges in the thickness of 0.25 ~ 1H profile, and 0.25 ~ (-1) H is the ideal sampling thickness.
【作者单位】： 华南师范大学地理科学学院;广东省建筑科学研究院集团股份有限公司风工程研究中心;
【基金】：国家自然科学基金项目(41771001) 广州市科技计划项目(201704020136)
【分类号】：P425.6;TU14
【相似文献】
相关期刊论文 前4条
1 国世友;周振伟;刘春生;;用风廓线指数律模拟风速随高度变化[J];黑龙江气象;2008年S1期
2 傅抱璞;于静明;;南京164米铁塔观测风速廓线的研究[J];南京大学学报(自然科学版);1981年04期
3 胡倬,唐仁茂;在空气污染研究中应用风廓线参数之探讨[J];气象;1988年06期
4 植石群,钱光明,罗金铃;广东省沿海风随高度变化研究[J];热带地理;2001年02期
，本文编号：2268602
本文链接：https://www.wllwen.com/jianzhugongchenglunwen/2268602.html
