TFT Webinars: Jean-Patrick Lebacque -- May 21st @ 11am EST
Jorge
Dear colleagues, it is our honor to announce:
Continuum 2D models for traffic on very large networks.
by Jean-Patrick LEBACQUE, Gustave Eiffel University
Abstract: Large network modelling gains interest for many reasons. Among those, let us mention: the increasing importance of regional traffic planning, dynamic assignment and management, the interconnection of transportation systems at a regional level, and the impact of information systems based on operator/social networks, which convey information instantaneously at a regional scale. Traffic modelling for very large networks offers some specific challenges, notably the complexity and sheer size of very large networks, as well as the difficulty to collect traffic data on all links. Hence the idea of developing specific models which have the capacity to describe the essential network dynamics with limited data and computational requirements.
The talk will describe some developments of the continuum approach to large network modelling. The continuum approach relies on a double approximation process: the approximation of the underlying network as a bi-dimensional continuous medium, and the approximation of traffic flow in the network by the flow of a bi-dimensional fluid. This approach has been applied in the past to classical operations research problems on networks, and more recently to traffic flow modelling, both vehicular and pedestrian.
The proposed model takes into account the underlying network structure. The surface network of dense roads and streets is described as a possibly anisotropic medium with privileged directions of propagation. Traffic flow is disaggregated per direction, OD and possibly per mode, thus allowing for many-to-many dynamic flows. Major infrastructures are modelled separately as a 1D network, which is interfaced with the 2D continuum model. Traffic on the 1D network is described by a GSOM approach, which can be interfaced with the 2D flow on the dense network. Local traffic supplies and demands constitute essential ingredients in this scheme.
Jean-Patrick LEBACQUE is General engineer (Ingénieur general des Ponts et Chaussées) of the French Ministry for the Ecological and Inclusive Transition, currently working at the GRETTIA laboratory of the University Gustave Eiffel, laboratory of which he has been director for the last 10 years. He is professor at ENTPE (Ecole Nationale des Travaux Publics de l’Etat, one of the two leading French higher teaching institutions for civil engineering) and EIVP (Ecole des Ingénieurs de la Ville de Paris, the leading French institution for urban engineering) and has also taught at ENPC (Ecole nationale des ponts et chaussées), and at the University Paris Est. He has served in various scientific committees (TGF, EWGT, Tristan), and as associate editor of Transportation Science and in various journal editorial boards (Transportation Research B and C, NHM). His research interests focus mainly on traffic and multimodal transportation modelling, with a special emphasis on large networks and on the impact of information and connectivity. They also include dynamic assignment and micromobilty.