A new workflow of urban scale 3D modelling and simulations to test the implications of the latest area-based FAR regulations on microclimate in the megacity Dhaka

Sharmin, Tania ORCID: https://orcid.org/0000-0001-6229-2035 and Rahaman, Md Mizanur 2023. A new workflow of urban scale 3D modelling and simulations to test the implications of the latest area-based FAR regulations on microclimate in the megacity Dhaka. Presented at: The 18th International IBPSA Building Simulation Conference, Shanghai, China, 4-6 September 2023. Building Simulation Conference Proceedings. , vol.18 IBPSA, pp. 2589-2596. 10.26868/25222708.2023.1354

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Abstract

The latest DAP (Detailed Area Plan 2022-35) for Dhaka has proposed an area-based FAR (Floor Area Ratios) decided on the basis of existing population density, road properties, civic amenities, and other physical characteristics of an area. Although the new building regulations attempt to control the building density, its impact on the city’s microclimate remains unclear. In this study we attempt to examine the impact of the above FAR regulations on the immediate microclimate compared to the existing building situation with the use of 3D modelling and microclimate simulations. It introduces a novel workflow to automatically extract, collect, and pre-process the building information (building height, types) from GIS data to generate 3D models for urban blocks for the existing conditions. The 3D model is implemented using Python programming and scripting language in a web-based interactive computing system (Jupytar Notebook) in a Rhyno-Grasshopper platform. Existing urban blocks are further developed/ altered to apply the new area-based FAR regulations to generate the future scenarios. Next, LadyBug tools (Urban Weather Generator in Dragonfly) are used to generate urban microclimate conditions for both existing and future scenarios which will show the implications of the area-based FAR regulations on microclimate in the megacity Dhaka. Five scenarios with distinctive urban morphology patterns are selected for the purpose of comparison. The findings of the study will help the policymakers and urban planners in Dhaka to understand the impact of the new building regulations and take necessary steps to rectify the policies before they take effect. Besides, the novel methodology developed through this study can be applied in other cities to test the impacts of future morphological patterns in terms of microclimate and building density.

Item Type:	Conference or Workshop Item - published (Paper)
Date Type:	Publication
Status:	Published
Schools:	Schools > Architecture
Publisher:	IBPSA
ISSN:	2522-2708
Date of First Compliant Deposit:	8 November 2023
Date of Acceptance:	4 September 2023
Last Modified:	02 Apr 2026 14:22
URI:	https://orca.cardiff.ac.uk/id/eprint/163742

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