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Wind suitability in site analysis of coastal concave terrains using computational fluid dynamics simulation: a case study in East Asia

CFD 模拟下基于风适宜度的沿海岙型地形选址分析—以东亚为例

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Abstract

The effect of wind environment is becoming increasingly important in analyzing and selecting sites for better natural ventilation of residential buildings, external comfort, and pollution dispersion. The main purpose of this study was to develop a set of methods for wind environment assessment in coastal concave terrains. This set of methods can be used to provide quantifiable indicators of preferable wind conditions and help site analysis. Firstly, a total of 20 types of coastal bays with concave terrains in East Asia were characterized to find ideal locations. The selected areas were divided into five categories according to the main terrain features. Then a sample database for the concave terrains was compiled for modelling comparisons. Secondly, a number of key wind variables were identified. Computational fluid dynamics (CFD) models of the typical coastal concave terrains identified as a result of the study were created, and the local wind environments were simulated with input from geographic information system (GIS) and statistic package for social science (SPSS) analysis. A measure of wind suitability was proposed that takes wind velocity and wind direction into account using GIS. Finally, SPSS was used to find the relationship between wind suitability and key terrain factors. The results showed that wind suitability was significantly associated with terrain factors, especially altitude. The results suggest that residential building sites should be selected such that their bay openings face the direction of the prevailing wind and that the opposite direction should be avoided.

中文概要

目的

风环境直接影响居住建筑室内外自然通风、舒适度以及污染物扩散情况。本文以居住建筑选址分析为目的,建立一系列针对东亚沿海岙型地形的风环境评价方法,分析影响风环境特点的主要因素,提出风适宜度评价模型,探讨风环境与主要地形因子之间的相关性。

创新点

1. 建立东亚沿海典型岙型地形的分类数据库;2. 提出基于选址分析的风适宜度模型;3. 建立风适宜度与地形因子之间的回归模型。

方法

1. 通过CFD 模拟的方法,计算典型工况下20 种岙型地形的风场(图5);2. 通过理论分析和数理耦合的方法,构建风适宜度模型(公式(4));3. 通过Logistic 回归方法,分析风适宜度与地形因子的相关性。

结论

1. 风适宜度直接受地形特征影响,开口面向来风向的岙型地形中风适宜度平均值最高,选址过程中应避开开口背向来风向的岙型地形;2. 通过多元回归分析得出风适宜度和地形因子的相关性显著,其中海拔是决定风适宜度的主要地形因子。

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Authors and Affiliations

  1. Urban Planning and Habitation Construction Research Center, Zhejiang University of Technology, Hangzhou, 310014, China

    Xiao-qing Zhu

  2. Faculty of Environmental Engineering, University of Kitakyushu, Kitakyushu, 802-8577, Japan

    Xiao-qing Zhu & Wei-jun Gao

  3. Department of Architecture, Zhejiang University, Hangzhou, 310058, China

    Jian-tao Weng, Yi-qun Wu & Zhu Wang

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  1. Xiao-qing Zhu
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  2. Jian-tao Weng
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  3. Yi-qun Wu
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  4. Wei-jun Gao
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  5. Zhu Wang
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Correspondence to Xiao-qing Zhu.

Additional information

Project supported by the National Natural Science Foundation of China (Nos. 51208466 and 51238011), the Science and Technology Research Program of Chinese Ministry of Housing and Urban-Rural Development (No. 2014R2-036), the Humanities and Social Sciences Research Foundation of the Ministry of Education (No. 17YJAZH136), the Natural Science Foundation of Zhejiang Province (No. LY16E0 80011), and the Social Sciences Planning Project of Zhejiang Province (No. 12JCSH02YB), China

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Zhu, Xq., Weng, Jt., Wu, Yq. et al. Wind suitability in site analysis of coastal concave terrains using computational fluid dynamics simulation: a case study in East Asia. J. Zhejiang Univ. Sci. A 18, 741–756 (2017). https://doi.org/10.1631/jzus.A1600313

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