Evaluation of Urban Ventilation Potential and Identification of Ventilation Corridors: A Case Study of Changsha Downtown Area
発表者／presenter’s name：〇Chen jiaao 1
所属／Affiliation：1 College of Landscape Architecture, Central South University of Forestry and Technology,Changsha, China

要旨／Abstract

This study takes Changsha city center as the research object, uses CFD numerical simulation technology to evaluate the ventilation potential of the study area by integrating morphological and thermodynamic factors, and identifies the existing ventilation corridors by combining with the results of the simulation of wind field scenarios, so as to construct the ventilation corridors in Changsha city center under a typical summer sunny day monsoon, to provide guiding suggestions for Changsha city’s future urban planning and ventilation planning, and provide a theoretical research basis for the construction of a low-carbon city. The main conclusions are as follows: (1) The spatial distribution of ventilation potentials in the downtown area of Changsha City decreases from the periphery to the center, and the differences are generally small. (2) Based on the assessment of ventilation potential, 16 ventilation corridors are identified, a three-level ventilation corridor system is constructed, and the ventilation performance of the corresponding corridors is calculated. (3) The optimization scheme is examined through construction and scenario simulation, and it is found that the overall wind speed of the optimization scheme is improved, and the highest wind speed value reaches 2.42 m/s. (4) The geodetic detector is used to analyze the six factors affecting the ventilation potential, namely, topographic conditions, roughness length, road conditions, built environment, open space, and water system, and it is found that the roughness length and the built environment have the greatest impact on the ventilation potential, indicating that the roughness length and the built environment have the greatest impact on the ventilation potential. It is found that roughness length and built environment are the factors that have the greatest influence on ventilation potential among the six factors, indicating that roughness length and built environment can be important determinants of the spatial distribution of ventilation potential.

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