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Quantifying and mapping embodied environmental requirements of urban building stocks

par Stephan, André ;Athanassiadis, Aristide
Référence Building and environment
Publication Publié, 2016-11-25

Article révisé par les pairs

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Résumé :

Cities and their building stocks result in huge environmental impacts which are critical to reduce.However, the majority of existing studies focus on operational requirements or on material stocks. Todate, very few studies have quantified embodied environmental requirements of building stocks andspatialised them.This study describes a bottom-up approach to spatially model building stocks and quantify theirembodied environmental requirements. It uses a highly disaggregated approach where each building'sgeometry is modelled and used to derive a bill of quantities. Construction assemblies relevant to eachbuilding archetype (derived based on land-use, age and height) are defined using expert knowledge inconstruction. The initial and recurrent embodied energy, water and greenhouse gas emissions associatedwith each material within each assembly are calculated using a comprehensive hybrid analysis technique.This model is applied to all buildings of the City of Melbourne, Australia.Results show that rebuilding the City of Melbourne's building stock today would require 904 kt ofmaterials/km2 (total: 32 725 kt), 10 PJ/km2 (total: 362 PJ), 17.7 Million m3 of embodied water/km2 (total:640.74 Million m3) and would emit 605 ktCO2e/km2 (total: 23 530 ktCO2e).This study demonstrates the breadth of the model outputs, including material stocks maps andbreakdowns of life cycle embodied requirements by material, construction assembly, building andbuilding typology at the city level. Using such model, city councils can better manage building stocks interms of waste processing, urban mining and circular economy, as well as reducing embodied environmentalrequirements over time.