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- Title
Uchimizu: A Cool(ing) Tradition to Locally Decrease Air Temperature.
- Authors
Solcerova, Anna; van Emmerik, Tim; Hilgersom, Koen; van de Ven, Frans; van de Giesen, Nick
- Abstract
The urban heat island effect was first described 200 years ago, but the development of ways to mitigate heat in urban areas reaches much further into the past. <italic>Uchimizu</italic> is a 17th century Japanese tradition, in which water is sprinkled around houses to cool the ground surface and air by evaporation. Unfortunately, the number of published studies that have quantified the cooling effects of <italic>uchimizu</italic> are limited and only use surface temperature or air temperature at a single height as a measure of the cooling effect. In this research, a dense three-dimensional Distributed Temperature Sensing (DTS) setup was used to measure air temperature with high spatial and temporal resolution within one cubic meter of air above an urban surface. Six experiments were performed to systematically study the effects of (1) the amount of applied water; (2) the initial surface temperature; and (3) shading on the cooling effect of <italic>uchimizu</italic>. The measurements showed a decrease in air temperature of up to 1.5 °C at a height of 2 m, and up to 6 °C for near-ground temperature. The strongest cooling was measured in the shade experiment. For water applied in quantities of 1 mm and 2 mm, there was no clear difference in cooling effect, but after application of a large amount of water (>5 mm), the strong near-ground cooling effect was approximately twice as high as when only 1 mm of water was applied. The dense measurement grid used in this research also enabled us to detect the rising turbulent eddies created by the heated surface.
- Subjects
ATMOSPHERIC temperature; CITIES &; towns &; the environment; URBAN heat islands; URBAN climatology; WATER resources development; WETLAND management; WATER distribution
- Publication
Water (20734441), 2018, Vol 10, Issue 6, p741
- ISSN
2073-4441
- Publication type
Article
- DOI
10.3390/w10060741