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The irrigation cooling effect at the Royal Botanic Garden Melbourne and Cranbourne

This study explores the impact of nocturnal irrigation on urban cooling at the Royal Botanic Gardens in Melbourne and Cranbourne. The research shows a cooling effect of 1-2°C during heatwaves, potentially saving lives. By identifying priority areas for intervention, such as those with higher temperatures, and using landscape coefficients, urban design can be optimized for heat respite. Different garden zones exhibited varying degrees of cooling, suggesting the need to adjust irrigation timing. Overall, nocturnal irrigation intensifies cooling, especially during heatwave conditions, making it a valuable strategy for combating urban heat islands.

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The irrigation cooling effect at the Royal Botanic Garden Melbourne and Cranbourne

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  1. The irrigation cooling effect at the Royal Botanic Garden Melbourne and Cranbourne Cho Kwong Charlie Lam, Ailie Gallant, Nigel Tapper

  2. Nocturnal irrigation alleviates urban heat island Potential 1-2°C cooling modified after City of Melbourne 2012

  3. Reducing 1-2 °C at night saves lives during heatwaves Threshold Temperature This morning’s minimum Nicholls et al. 2008

  4. Identify neighbourhoods that require intervention A = Moderate priority B = Medium priority C = Highest priority Norton et al. 2015

  5. Hourly-avg Ta data 18/12/13 – 26/3/14 O Gate (ref.) Fern Gully Oak Lawn

  6. Cranbourne Garden Ian Potter Lawn Desert Discovery Camp (ref.) Bloodwood Garden Hourly-avg Ta data 18/12/13 – 26/3/14

  7. Well-irrigated areas were 2-4 °C cooler than non-irrigated areas during heatwave Melbourne Garden Hot Ta average of 12-4pm, 14 – 17 January 2014 (Tmax > 41 °C) Warm

  8. Nocturnal irrigation cooling and residual daytime cooling Positive values indicate cooling. Ta difference: O Gate – Oak Lawn Average of 10 irrigation events

  9. Irrigation intensified nocturnal cooling during heatwave Heatwave days: Ta ≥ 35 °C (n = 3) Ta difference: O Gate – Oak Lawn

  10. Limited nocturnal cooling effect when daytime misting systems were used Average of 10 irrigation events Ta difference: O Gate – Fern Gully

  11. Lawn surface produced 1-2 °C nocturnal cooling Average of 15 irrigation events Ta difference: Desert Discovery Camp – Ian Potter Lawn

  12. Gravel surface had negligible irrigation cooling effect Average of 16 irrigation events Ta difference: Desert Discovery Camp – Bloodwood Garden

  13. Prioritising the landscape zones that require additional mitigation 10 0 Well-being nodal space Very poor Very positive

  14. Incorporating water-sensitive urban design in cooling sculptures for heat respite Breeze shelter in Singapore Misting system

  15. Summary Irrigation cooling effect differed between two gardens with distinct characteristics Greater irrigation cooling effect during heatwaves Consider shifting irrigation timing

  16. Landscape coefficient determines irrigation priority Connellan 2013

  17. Royal Botanic Garden Cranbourne 2016

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