Nahid Mohajeri

Site web: http://leso.epfl.ch
Unité: LESO-PB

Données administratives

Compétences

Complex urban systems
Statistical modelling of urban patterns
Physics of urban form
Urban big data
Sustainable urban development
GIS and spatial data analysis
Urban ecosystems

Publications

Enseignement & Phd

Enseignement

Programmes doctoraux

  • Doctoral Program in Energy

Doctorants

Projects (PhD, MSc, BSc)

PhD project (Co-supervisor): (i)Geo-Dependent Energy Supply in Relation to Urban Form, Funded by SCCER Master projects: (i)Eco-District and Energy Planning (ii)A Parametric Facade Design for Improving Daylight Performance (iii)Roof-shape complexity: An urban-scale classification of roof geometries for solar energy applications (iv)How street configurations control solar energy potential? Semester projects: (i)Urban configuration and renewable energy (ii)Urban metabolism of Fribourg: From energy flows to energy management Bachelor projects: (i)Renewable Energy and Urban Form (ii)Urban Energetics and Spatial Data (iii)Renewable Energy and Built Form Winter School EUROTECH, Feb 2015: Teaching two lectures in the Winter School EUROTECH Feb 2015: “Integrated Urban Energy Systems Design”. Course title: Energy- Efficient Urban Configurations: Theory and Application.

Recherche

Introduction

In order to model the dynamics of built environment and understand their sustainable development, as well as their interactions with infrastructure networks and urban ecosystem we need a comprehensive theoretical understanding of cities as complex systems. One principal aim of this research is to use the complex system theories and methods from physics and engineering in order to reduce the negative environmental impact of the cities through the following approaches: (1) developing energy-efficient urban forms, (2) modelling and identifying renewable energy resources from regional to city scale, (2) improving our understanding of urban metabolism, (3) improving the environmental impacts of urban infrastructure networks and mobility patterns through data-driven approaches and real-time data (4) assessing and minimising the ecological footprints of cities.

Energy-Efficient Urban Forms

How do different urban forms relate to energy consumption and renewable energy supply (e.g. solar energy)? The aim is to explore the effects of different urban configurations including compact/dispersed on the energy use and microclimate. A further aim is to assess the contribution of different urban forms to sustainability, and to provide a framework for eco-cities (e.g. green infrastructure, high density, mixed land-use, ecological and cultural diversity, and passive solar design). To quantify the complexities of urban forms in relation to energy use and their sustainable development, the following methods are used: (i) Urban entropy analysis, (ii) Statistical methods, (iii) Methods adapted from physics and engineering (such as statistical physics/information theory), (iv) GIS and spatial analysis.

Urban Big Data and Renewable Energy Potentials

We live in a data-driven world and many scientific sub-disciplines have become largely data-driven, including aspects of social science, urban science, and energy management. The aim is to collect different types of energy data (satellite data, estimated and measurements data, etc.) and multi-scale urban data (neighborhood level, city and regions), as well as real time datasets - big data – so as to discover patterns in large data sets and propose new ways to map, visualize, and analyze them (average trends, statistical characteristics, deviation from average, and changes over time). GIs and geo-statistical tools, machine learning (e.g. SVM)and data mining techniques can be used so as to analyse urban data and identify the current renewable resources as well as to make predictions or future decisions.

Size, Scaling Relations, and Urban Metabolism

One of the most salient characteristics of a city is its population size, which affects its productivity, energy use, innovation, and wealth creation. The aim is to study the importance of urban population size and scaling laws (super-linear and sub-linear relations) in cities. The topic covers the scaling relations between city size and infrastructure (transport networks and buildings), city size and resources (flows of energy, materials, waste, goods and information, etc.), but also city size and socio-economic parameters (income, innovation, disease) so as to find the regularities and systematic behavior of cities as analogies to biological and ecological systems. The aim is to develop an urban metabolism approach using statistical thermodynamics, network models and the maximum entropy method which have the potential to bring about fruitful results and new tools as to modelling energy flows in urban systems.

Cities, Infrastructure Networks and CO2 Emission

Urban infrastructure, especially transport networks, are major determinant of the overall structure, productivity, global economy, and energy efficiency of cities. Transport is also a major source of greenhouse gas emissions: CO2 emissions in the transport sector are about 30% of the total for developed countries and about 23% of total anthropogenic CO2 emissions worldwide (www.unece.org). The aim of this study is to understand the relation between mobility network structure, which connects people and places, and fuel consumption and carbon dioxide (CO2) emissions. Such a relation should provide a better understanding of how cities are organized and how they can use energy efficiently. Entropy analysis, for quantifying network structure, statistical modelling and GIS related tools use in this study.

Media and outreach activities

1. EPFL news Mediacom. Et si du désordre urbain naissait la durabilité ? Ppublished in e-newsletter, interviewed by Sandy Evangelista, 24 August 2015
2. EPFL Flash Newspaper. Could urban disorder leads to sustainability? EPFL newspaper, FLASH, interviewed by Sandy Evangelista, No.7, 24 September 2015
3. Le Temps. Comment agrandir une ville sans faire trop de dégâts (City expansion without negative environmental impact)? Published in Le Temps, interviewed by Nic Ulmi, 2 September 2015.

Editorial tasks

Associate Editor of Sustainable Design and Construction: Frontiers in Built Environment
http://journal.frontiersin.org/journal/built-environment
Chief Editor: Professor Nyuk Hien WONG, National University of Singapore,Singapore.

Associate Editor of Urban Science: Frontiers in Built Environment
http://journal.frontiersin.org/journal/built-environment
Chief Editor: Professor Marina Alberti, University of Washington,USA.