Urban canyons

From Glossary of Meteorology

urban canyons

The characteristic geometry formed by a city street and its flanking buildings.

Together with the intervening roofs they provide a first-order repetitive structure to cities with characteristic patterns of sunlight and shade and cross-street vortices. Commonly described by their nondimensional aspect ratio H/W, where H is the mean height of the buildings and W the width of the street.

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