Abstract
The correct urban building layout is an important influencing factor in urban ventilation, and the heat island effect has become an important factor affecting the quality of urban life. Optimization of the urban building layout can play a role in mitigating the heat island effect. The traditional ventilation corridor analysis method, based on a least-cost path analysis, can only generate a few main ventilation corridors. It is difficult to obtain global ventilation results covering the whole study area using this method of analysis. On the basis of urban morphology and a least-cost path analysis, this study proposes a “least cumulative ventilation cost” method for analyzing urban ventilation. Taking Wuhan downtown as a research area, the urban ventilation environment under different wind directions and seasons was analyzed. This method can effectively express the ventilation conditions throughout the whole study area and can simultaneously express the quality of the generated corridors effectively. The results show that Wuhan has three levels of ventilation corridor. Moreover, the ventilation conditions in Wuchang (Wuchang, Qingshan, and Hongshan) are better than those in Hankou (Qiaokou, Jianghan, and Jiang’an).
Highlights
E numerical simulation method uses GIS technology to analyze urban ventilation environments by calculating the surface roughness of the underlying surface [30,31,32,33,34]
Affected by different wind directions, the spatial distribution of ventilation corridors in the city takes on different shapes, and the directionality of the corridors is consistent with the wind direction
Using the urban morphological characteristics identified by GIS technology, this study established an least cumulative ventilation cost (LCVC) method to describe quantitatively the urban ventilation environment at the city scale
Summary
E numerical simulation method uses GIS technology to analyze urban ventilation environments by calculating the surface roughness of the underlying surface [30,31,32,33,34]. Many constructive results have been obtained using the LCP-based method, confirming the credibility and correctness of this approach [30,31,32] This method cannot effectively identify corridor width, and it is difficult to evaluate the ventilation conditions of places without leastcost paths (LCPs). Based on the above analysis, a new ventilation corridor analysis method is urgently needed, which needs to meet the following requirements First of all, this method should have a lower operating cost to implement the analysis of the urban ventilation environment in large areas. This method should have a lower operating cost to implement the analysis of the urban ventilation environment in large areas This method should have the ability of ventilation environment analysis of dynamic wind direction. Wuhan is located in the east of the Jianghan Plain and the middle reaches of the Yangtze River. e world’s third-largest river, the Yangtze, and its largest tributary, the Han River, meet in the city, dividing Wuhan’s central urban area into three parts. ese are Hankou (including Jianghan District, Jiang’an District, and Qiaokou District), Wuchang (including Wuchang District, Qingshan District, and Hongshan District), and Hanyang. e rivers and lakes (such as the East Lake, Tangxun Lake, South Lake, and Sand Lake) are intricately woven into the fabric of the city. e water area occupies a quarter of the city’s total area, providing the city with a lot of open spaces along the lakes and rivers
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