Negin Nazarian

Negin Nazarian
UNSW Sydney | UNSW · Faculty of Built Environment

PhD Engineering Science - Climatology

About

48
Publications
23,221
Reads
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974
Citations
Citations since 2017
42 Research Items
957 Citations
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Introduction
Negin Nazarian is a Scientia Senior Lecturer (Assistant Professor) at the Faculty of Built Environment, University of New South Wales. Negin’s research targets microscale analysis of urban heat, ventilation, and thermal comfort, using various methodologies ranging from the development of numerical tools to employing wearables and IoT-based sensors. Her current collaborative project is 'Urban Boundary-Layer and Heat Island Modeling, Measurement and Mitigation.'
Additional affiliations
January 2016 - April 2016
Singapore-MIT Alliance for Research and Technology
Position
  • SMART Scholar
January 2011 - December 2015
University of California, San Diego
Position
  • Research Associate
Education
September 2012 - December 2015
September 2011 - September 2012

Publications

Publications (48)
Article
Full-text available
The Urban Heat Island concept is often used to describe ‘excess’ heat associated with urban areas, and is therefore frequently considered to be a negative phenomenon that requires mitigation. In this short communication, we use clear examples to show that this is not necessarily true. Furthermore, we demonstrate that the Urban Heat Island intensity...
Article
Full-text available
Global climate is changing as a result of anthropogenic warming, leading to higher daily excursions of temperature in cities. Such elevated temperatures have great implications on human thermal comfort and heat stress, which should be closely monitored. Current methods for heat exposure assessments (surveys, microclimate measurements, and laborator...
Article
Full-text available
To fully address the multi-faceted challenges of urban heat, it is paramount that humans are placed at the center of the agenda. This is manifested in a recent shift in urban heat studies that aim to achieve a "Human-Centric" approach, i.e. focusing on personalized characteristics of comfort, well-being, performance, and health, as opposed to the o...
Article
Full-text available
Urban overheating, driven by global climate change and urban development, is a major contemporary challenge that substantially impacts urban livability and sustainability. Overheating represents a multifaceted threat to the well‐being, performance, and health of individuals as well as the energy efficiency and economy of cities, and it is influence...
Article
Thermal comfort in the built environment is a crucial factor impacting health, well-being, and productivity of urban dwellers. Accordingly, comprehensive analyses are needed to ensure that acceptable criteria of thermal comfort are defined and met in urban environments. The main objective of this study is to define such performance metrics and qual...
Chapter
Urban climate models—focused on various scales and perspectives—provide important means to analyze complex physical processes forming urban climates and further quantify the ways climate change and urbanization have resulted, and will result, in local-scale modification of climate in the built environment. This chapter aims to provide an overview o...
Article
Full-text available
Cities today encounter significant challenges pertaining to urbanization and population growth, resource availability, and climate change. Concurrently, unparalleled datasets are generated through Internet of Things (IoT) sensing implemented at urban, building, and personal scales that serve as a potential tool for understanding and overcoming thes...
Article
Full-text available
Cities with different background climates experience different thermal environments. Many studies have investigated land cover effects on surface urban heat in individual cities. However, a quantitative understanding of how background climates modify the thermal impact of urban land covers remains elusive. Here, we characterise land cover and their...
Article
Full-text available
Public health risks resulting from urban heat in cities are increasing due to rapid urbanisation and climate change, motivating closer attention to urban heat mitigation and adaptation strategies that enable climate-sensitive urban design and development. These strategies incorporate four key factors influencing heat stress in cities: the urban for...
Article
Full-text available
In urban climate studies, datasets used to describe urban characteristics have traditionally taken a class-based approach, whereby urban areas are classified into a limited number of typologies with a resulting loss of fidelity. New datasets are becoming increasingly available that describe the three-dimensional structure of cities at sub-metre mic...
Preprint
Full-text available
Public health risks resulting from urban heat in cities are increasing due to rapid urbanisation and climate change, motivating closer attention to urban heat mitigation and adaptation strategies that enable climate-sensitive urban design and development. These strategies incorporate four key factors influencing heat stress in cities: the urban for...
Article
Full-text available
The scientific field of urban climatology has long investigated the two-way interactions between cities and their overlying atmosphere through in-situ observations and climate simulations at various scales. Novel research directions now emerge through recent advancements in sensing and communication technologies, algorithms, and data sources. Coupl...
Preprint
Full-text available
As public health risks resulting from urban heat in cities increase due to urbanisation and climate change, there is a pressing need to design strategies for urban heat mitigation and ensure that future development is climate sensitive. Heat stress in cities is mainly influenced by four factors: the built form, natural and vegetated form, human urb...
Article
Full-text available
Good representation of turbulence in urban canopy models is necessary for accurate prediction of momentum and scalar distribution in and above urban canopies. To develop and improve turbulence closure schemes for one-dimensional multi-layer urban canopy models, turbulence characteristics are investigated here by analyzing existing large-eddy simula...
Article
Full-text available
Maintaining indoor environmental (IEQ) quality is a key priority in educational buildings. However, most studies rely on outdoor measurements or evaluate limited spatial coverage and time periods that focus on standard occupancy and environmental conditions which makes it hard to establish causality and resilience limits. To address this, a fine-gr...
Article
Full-text available
The spatial variability of land cover in cities results in a heterogeneous urban microclimate, which is often not represented with regulatory meteorological sensor networks. Crowdsourced sensor networks have the potential to address this shortcoming with real-time and fine-grained temperature measurements across cities. We use crowdsourced data fro...
Article
Full-text available
2020 Georg Thieme Verlag. All rights reserved. The Vertical City Weather Generator (VCWG) is a computationally efficient urban microclimate model developed to predict temporal and vertical variation of potential temperature, wind speed, specific humidity, and turbulent kinetic energy. It is composed of various sub-models: A rural model, an urban ve...
Article
Full-text available
Thermal comfort research has been historically centred around the concept of “thermal neutrality”. Thermal neutrality originates from the steady-state indoor environment and is increasingly questioned when used to define the optimum sensation in outdoor environments. This calls for new criteria, designated for non-steady state and dynamically evolv...
Article
The psychometric tool known as the thermal sensation scale has been extensively used in outdoor thermal comfort research. However, this one-dimensional descriptive scale was originally developed for indoor assessments and therefore has certain shortcomings in outdoor settings. The scale contains no affective information such as pleasure and it over...
Preprint
Full-text available
This is a comment to the paper "Magnitude of urban heat islands largely explained by climate and population" by Manoli et al. (2019, Nature 573 p. 55-60; https://doi.org/10.1038/s41586-019-1512-9)
Article
Vegetation alters urban climates via transpirational cooling; however, unlike shorter vegetation, trees additionally provide shade and shelter. Urban canopy models (UCMs) are coupled with mesoscale models for assessment of neighbourhood-scale climate, but their representation of urban trees is limited. We present BEP-Tree, a multi-layer UCM that in...
Article
Full-text available
In mesoscale climate models, urban canopy flow is typically parameterized in terms of the horizontally averaged (1-D) flow and scalar transport, and these parameterizations can be informed by computational fluid dynamics (CFD) simulations of the urban climate at the microscale. Reynolds averaged Navier–Stokes simulation (RANS) models have previousl...
Article
Full-text available
Labelled human comfort data can be a valuable resource in optimising the built environment, and improving the wellbeing of individual occupants. The acquisition of labelled data however remains a challenge. This paper presents a methodology for the collection of in-situ occupant feedback data using a Fitbit smartwatch. The clock-face application co...
Preprint
Full-text available
In mesoscale climate models, urban canopy flow is typically parameterized in terms of the horizontally-averaged (1-D) flow and scalar transport, and these parameterizations can be informed by Computational Fluid Dynamics (CFD) simulations of the urban climate at the microscale. Reynolds Averaged Navier-Stokes Simulation (RANS) models have been prev...
Article
Full-text available
The Vertical City Weather Generator (VCWG) is a computationally efficient urban microclimate model developed to predict temporal and vertical variation of temperature, wind speed, and specific humidity. It is composed of various sub models: a rural model, an urban microclimate model, and a building energy model. In a nearby rural site, a rural mode...
Preprint
Full-text available
Labelled human comfort data can be a valuable resource in optimising the built environment, and improving the wellbeing of individual occupants. The acquisition of labelled data however remains a challenge. This paper presents a methodology for the collection of in-situ occupant feedback data using a Fitbit smartwatch. The clock-face application co...
Article
Urban overheating, driven by the increasing expansion of our cities and the global climate change, is becoming one of the main environmental challenges of today. Consequently, cooling technologies are emerging as mitigation and adaptation strategies. Reflective roof and pavement surfaces have been widely studied for their potential benefits, but de...
Article
With the rise in urban air temperature, heat stress and thermal discomfort are challenging the livability of urban environments. To respond to this concern, we employ numerical modeling to evaluate the spatial and temporal variabilities of thermal comfort and introduce a simulation tool: outdoor thermal comfort in 3D (OTC3D). The model builds upon...
Conference Paper
Full-text available
The consideration of thermal comfort and thermal stress in urban environments is gaining widespread attention as the rate and strength of heat waves, and consequently, the heat-related mortality, are increasing dramatically around the world. Accordingly, comprehensive analyses are needed to ensure that acceptable criteria of thermal comfort are def...
Article
Full-text available
Urban morphology and inter-building shadowing result in a non-uniform distribution of surface heating in urban areas, which can significantly modify the urban flow and thermal field. In Part I, we found that in an idealized three-dimensional urban array, the spatial distribution of the thermal field is correlated with the orientation of surface hea...
Article
Full-text available
As urbanization progresses, more realistic methods are required to analyze the urban microclimate. However, given the complexity and computational cost of numerical models, the effects of realistic representations should be evaluated to identify the level of detail required for an accurate analysis. We consider the realistic representation of surfa...
Article
Full-text available
Dense urban areas restrict air movement, causing airflow in urban street canyons to be much lower than the flow above buildings. Boosting near-ground wind speed can enhance thermal comfort in warm climates by increasing skin convective heat transfer. We explored the potential of a wind catcher to direct atmospheric wind into urban street canyons. W...
Article
Full-text available
The influence of roof-edge roughness elements on airflow, heat transfer, and street-level pollutant transport inside and above a two-dimensional urban canyon is analyzed using an urban energy balance model coupled to a large-eddy simulation model. Simulations are performed for cold (early morning) and hot (mid afternoon) periods during the hottest...
Article
With the rapid rate of urbanization, outdoor thermal comfort is a growing health concern in densely-built areas. Accordingly, in order to achieve a comprehensive solution to urban environmental problems, more detailed and accurate prediction of outdoor thermal comfort is needed alongside building energy and urban wind flow analyses. To address this...
Research
Full-text available
Climate and environmental challenges are among the important criteria for evaluating the “livability” of future cities. However, climate analysis in the complex and constantly-changing environment of cities is intricate in its nature: environmental challenges should be evaluated from different points of reference (indoor vs outdoor environment, str...
Conference Paper
Full-text available
Outdoor thermal comfort is of growing concern in the urban areas, and is influenced by various factors such as urban morphology, surface characteristics, and non-uniform surface heating that is caused by solar insolation and inter-building shadowing. Although urban design and planning can be employed to enhance the thermal experience of urban dwell...
Article
Full-text available
Numerical fluid flow and heat transfer simulations of a three-dimensional idealized urban environment are performed to investigate the effect of realistic non-uniform thermal forcing that is caused by solar insolation and inter-building shadowing. Simulations at different times of day are performed using Large Eddy Simulation (LES) and mean flow an...
Conference Paper
Full-text available
As urbanization progresses, more comprehensive and advanced methods are required to analyze the modifications of urban microclimate. Among various factors that alter urban environments from undisturbed climates, street level air pollution due to vehicular exhausts is of major concern and is significantly affected by atmospheric motion and stability...
Conference Paper
Full-text available
Building occupancy is very important for building energy simulation and research, however generating an occupancy model that is closer to the real world occupancy patterns is a very challenging task. In this paper, we have proposed a generalized event driven framework for the simulation of building occupancy. Real humans work together in groups and...

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Projects

Projects (4)
Project
Thermal comfort research has been centered around uni-dimensional thermal neutrality in steady environments for almost a century. This study aims to re-orient the outdoor thermal comfort research discourse towards non-steady-state alternatives that afford greater opportunities for multi-dimensional thermal pleasure compared to steady,uni-dimensional neutrality.
Project
Special issue of International Journal of Environmental Research and Public Health https://www.mdpi.com/journal/ijerph/special_issues/UOL We invite colleagues to submit papers on: • the impact of urban overheating on building energy needs, electricity demand, health, economy, and hygrothermal comfort. • comprehensive methodologies and metrics for quantifying the local and global impact of urban overheating. • the cooling potential of innovative mitigation and adaptation technologies (from both urban and building design perspectives). In particular, we are interested in original contributions on the development and testing of methods to measure and model the performance of consolidated and advanced technologies, with the identification of the elements of uncertainty, evaluating their reliability and performance in the context of the application. • the impact and role of advanced mitigation and adaptation policies on human health, energy, peak electricity demand, environment, economy, and comfort. • innovative application of mitigation and adaptation solution in large-scale projects both at the theoretical and experimental level. Deadline for manuscript submissions: 30 June 2019.