GREEN AND BLUE INFRASTRUCTURE TO REGULATE THERMAL COMFORT IN HIGH DENSITY CITY PLANNING: A CASE OF NAVI MUMBAI, INDIA

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Abstract Summary
World has seen an increased gathering of its population in urban areas, since 1990. As the urban population increases, the land area occupied by cities has increased at an even higher rate. A global sample of 120 cities observed between 1990 and the year 2000, shows that while the population grew at a rate of 17 per cent on average, the built-up area grew by 28 per cent. It has been projected that by 2030, the urban population of developing countries will double, while the area covered by cites would triple. Cities create an environment that is clearly distinct from their surrounding areas. Urban structures alter the surface energy budget, modify the vertical profile of various atmospheric properties, interact with both local and regional circulation, and introduce anthropogenic heat. As a result, the climate conditions in the urban environment significantly differ from their rural system. Sustainability in planning is a topic of high interest among urban planners, urbanist and policy makers yet lack of scientific knowledge in the field leads to low impact in evolving urban planning decisions. Urban climatic map (UCmap), as a tool provides a visual and spatial information platform using Geographic Information System (GIS). The major causes for increasing the local temperature of cities compared to the rural area has been attributed to densification, reduction in vegetation cover, open water surface and increase in anthropogenic heat in urban system. Thus, to mitigate the heat load in urban areas, the focus should be towards customizing urban vegetation for shading and evaporative cooling, introducing open water surfaces, planning of built structures that support ventilation by choosing an appropriate geometry and size of buildings and street areas, and applying suitable materials and colors for buildings to reduce the heat storage and the absorption of solar radiation. Increase in vegetation and water surfaces, known as green and blue infrastructure, is of particular interest due to their multiple functionality and benefits for the urban environment, such as increasing urban biodiversity and improving air quality in case of urban vegetation. Keeping the aforesaid knowledge in mind, the researcher has chosen Navi Mumbai City, India, as study area for further investigation. The Authors have made an attempt to establish the casual linkage green and blue infrastructure (GBI) on urban climate and shall map the effects of the presence of GBI in the system. The urban climatic, environmental and planning parameters, as well as their impact, are considered to synthesize and comprehensively evaluate the physical urban environment with regard to thermal load (TL) and dynamic potential (DP). The parameters considered to evaluate Thermal load include: Topography; Population Density; Land Use; Land Surface Temperature; Air Temperature and Dynamic potential are: Normalized difference Built up Index (NDBI); Normalized difference Vegetation Index; (NDVI); Normalized difference Water Index (NDWI) and Prevailing Wind of the study region. Arch GIS software to employ to develop 9 input layers, and an urban climatic analysis map shall be developed and various areas of similar climatopes shall be described with their particular characteristics of study region. Study concludes with planning decisions to develop urban climatology-based map for Green and Blue infrastructure to enhance cooling effects and thereby undertaking measures to regulate thermal comfort in the city through green and blue infrastructure.
Abstract ID :
ISO68
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Associate Professor and Head, Department of Planning,
,
School of Planning and Architecture Vijayawada, Andhra Pradesh, India
Master in Environmental Planning and Management,Department of Planning,
,
School of Planning and Architecture Vijayawada, Andhra Pradesh, India

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