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<p>In an infinitely-long canyon sky-view factor (SVF) depends solely on the aspect ratio,&#xa0;while its length is an important determinant in a finite canyon. Changes in SVF values&#xa0;are not uniform across variations in the canyon’s height, width and length. To enhance SVF in an urban canyon, it is necessary to identify the point of maximum impact on SVF with respect to variations in the dependent variables. This study analyzed SVF values in several hypothetical canyons with various combinations of canyon dimensions. In a vector-based method of SVF calculation with the rotation angle of 1°, increasing length demonstrated no significant effect on SVF beyond a length-to-width ratio of 57.29, and the canyon could be quantitatively defined as infinitely long where the analytical method was applicable. Furthermore, in instances where the aspect ratio exceeded 0.5, the SVF could be estimated as half of the inverse of the aspect ratio. This study demonstrated that increasing canyon height exerted a more substantial influence on the reduction of SVF in a low-rise development abutting a narrow canyon, compared with a high-rise development abutting a narrow canyon or a low-rise development abutting a wide canyon. Increasing the canyon width had a more pronounced effect on increasing SVF for low-rise developments situated along narrow canyons in contrast to wide canyons or a high-rise developments.</p>

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Impact of canyon's height, width and length on the sky-view factor in a symmetrical urban canyon

  • 期刊论文

  • 发表日期：

    2025年5月5日

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  • Binit Kumar,
  • Basudatta Sarkar

摘要

In an infinitely-long canyon sky-view factor (SVF) depends solely on the aspect ratio, while its length is an important determinant in a finite canyon. Changes in SVF values are not uniform across variations in the canyon’s height, width and length. To enhance SVF in an urban canyon, it is necessary to identify the point of maximum impact on SVF with respect to variations in the dependent variables. This study analyzed SVF values in several hypothetical canyons with various combinations of canyon dimensions. In a vector-based method of SVF calculation with the rotation angle of 1°, increasing length demonstrated no significant effect on SVF beyond a length-to-width ratio of 57.29, and the canyon could be quantitatively defined as infinitely long where the analytical method was applicable. Furthermore, in instances where the aspect ratio exceeded 0.5, the SVF could be estimated as half of the inverse of the aspect ratio. This study demonstrated that increasing canyon height exerted a more substantial influence on the reduction of SVF in a low-rise development abutting a narrow canyon, compared with a high-rise development abutting a narrow canyon or a low-rise development abutting a wide canyon. Increasing the canyon width had a more pronounced effect on increasing SVF for low-rise developments situated along narrow canyons in contrast to wide canyons or a high-rise developments.