intermodal solutions for transalpine freight traffic - Alpine Space ...

supply model
The supply model is a mathematical description
of the main elements of the actual system
and their interrelations. It is based on a theory
of the graphs, on the functions of costs/flows
and on the performances (e.g. level of service)
of the arcs in the network.
The following paragraph describes the
carachteritical sequences when building up the
supply model.
The first phase consisted in the delimitation
of the study area (the geographic area which
encompasses the transport system to be analyzed).
In more detailed words the area of interest
functionally affected by the by the majority
of the effects of the planned interventions Thus,
the area outside of the zone of the analysis,
is the exterior environment. It is excusively affected
by the interconnections with the project
system.
In the second phase the study area has been
framed in homogeneous traffic areas from
the point of view of the settlement characteristics
and of the transport offer, at a level which
is compatible with the thoroughness of the data
provided by WP4 and WP5. A point have been
associated to each area (centroid node) where
the origin and destination matrices are concentrated
for the movements regarding the area of
interest.
The model foresee the subdivision of the
area of study in 1043 homogenous areas
(centroid deriving from the Project AlpenCors)
where the origins and destinations of the transfers
are likely to be located. Fig.
In this specific analysis, the zoning was implemented
by the subdivion with more narrow
sub-areas referred to zones which are more
strategical in view of the functionality of the Alpine
network, in particular with respect to those
which are considered within the context of the
Pilot Projects.
The extraction of the graphs consented
the identification of the space-time positions
(nodes) and of the connections (arcs), which
were considered relevant in view of the representation
of the network.
The infrastructures to be included in the
model have therefore been identified, included
the (fictitious) arcs which link the centroid and
the network as well as the characteristic of the
elements of the graph.
In particular, the reference network was implemented
with the following parameters:
• basic characteristics (topological information),
• infrastructures (length, width, number of
lanes and of rails),
• quality of the service (commitment/capacity
relationship and basic average speed)
• cost for the user (motorway toll differentiated
per subject managing in Euro/km, where
this is present; cost of the tickets for railway
users etc).
The following figures are the exemplary representation of the road and the rail graph with reference
to the alpine area considered.
Road graph and flowgramme – extract.
Source: own elaboration on the basis of AlpCheck project
Rail graph – extract.
Source: own elaboration on the basis of AlpFrail Project
84 transitects – final report
CalCulating the environmental effeCts of pilot ConneCtions
85