Impact Analysis of Deep Static Bluespace on Urban Heat Island: Case of Chandigarh Aditya Rahul 1 , Indian Institute of Technology Roorkee (India) Mahua Mukherjee, Indian Institute of Technology Roorkee (India) ABSTRACT Urbanisation has picked up rapid pace since dawn of the industrial revolution. This unprecedented and unplanned urbanization is leading to Urban Heat Island effect. Urban Heat Island effect is a rise in temperature of the urban area in comparison to nearby rural areas, which in turn have a multidimensional impact on human health. Urban waterbody can act as a viable solution to attenuate this phenomenon. This research investigates the impact of Sukhna Lake (deep static waterbody) on heat stress in Chandigarh, India using remotely sensed data (LANDSAT-8 TIRS). It also examines the influence of urban form in the vicinity of the waterbody in propagating or reducing the impact. The results show that in Subtropical Humid climate of Chandigarh, waterbody provides a cooling effect in both summer and winter, with the cooling impact being greater in summer. Impact amplitude can go as high as 6.1 ℃ in summer in an area of sparsely built and low plant. The maximum impact range was observed to be 1080m in winter in the area of dense trees, whereas maximum impact gradient of 0.1383 ℃/m is achieved in the compactly built low-rise area during summer. This result will assist urban planners and designers to plan suitable built environment around waterbody and vice versa for better heat stress attenuation as well as optimal urban landscape designs for a more ecologically sound and pleasant living environment. Introduction Urban waterbody plays a multidimensional role in healthy well-being of the city by catering to its economical, ecological and socio-cultural needs. They were an integral feature of the urban landscape of most of the Indian cities but over the past few decades, unprecedented and unplanned urbanisation has led to a steady decline in urban waterbody area in India (Bindu & Mohamed, 2016). This decline in waterbody area is coinciding with rise in temperature of urban area. It has been established that urban areas have higher temperature than surrounding rural area (Oke, 1987). In regions with very hot summers, any reduction in temperature is a welcome relief. This study investigates the potential of waterbody to provide cooling in its surroundings. Previous studies have shown that waterbody has the ability to influence thermal environment of its nearby surroundings (Hathway & Sharples, 2012; Y. Wang, Zhan, & Ouyang, 2019). It can provide cooling effect, sometimes referred as water cooling island (Coutts, Tapper, Beringer, Loughnan, & Demuzere, 2012; Gunawardena, Wells, & Kershaw, 2017; Sun & Chen, 2012) and in some cases it has also been observed that it can contribute to thermal stress by providing warmth in some climate zones (Moyer & Hawkins, 2017). Waterbodies can be 1 Aditya Rahul: arahul@ar.iitr.ac.in, +91 8558069778. -- 88 -- Conference Proceedings of 5th International Conference on Countermeasures to Urban Heat Islands (IC2UHI) 2019 December 2-4, 2019, Hyderabad, India https://doi.org/10.37285/bsp.ic2uhi.9