Alkema, Dinand
SCHEMATIC MAP OF THE STUDY AREA
Val di Non o5
2,
Qr
Monte Corona
Ew
‘Monte. Paganella Fi : 1
N
ara
E «Foto
Monte Callisio
Industrial area M
Co Urban areas 2
ES
2
TRENTO
Alluvial fant
Fig. 3: Schematic map of the area
Geomorphologic system
(http://wwwdb.gndci.pg.cnr.it/)
The Adige valley is an old North-South oriented glacial
valley with steeps slopes on both sides. The valley
plain consists of alluvial sediments that were deposited
after the glacier’s retreat. On the western slopes of high
and nearly vertical dolomite cliffs, the presently active
geomorphologic processes are mostly hydro-
gravitational related: rock-fall and debris-flows. On the
less steep eastern slope the processes are mostly related
to fluvial activity (down-cutting, erosion) and to slope
activity (landslides, soil-slips). On the alluvial plain,
the major geomorphologic actors are the river Adige
and the Avisio river. The Adige is a highly dynamic
river with an average discharge of about 200 cubic
meter per second (at Trento), but during floods this
number can rise to over 1000 m’/s. The river can
respond very quickly to meteorological events. To
protect the plain from regular flooding the river has
been constrained in its activities by numerous
mitigation measures, of which dykes on both sides are
the most visible ones. Floods pose the major risk on the
people living and working on the floodplain.
The database of the Italian National Research Council
(CNR-IRPI) gives a overview of historic events of
slope-instability and floods in Trento
As stated before, one of the most important steps in the geomorphologic assessment is the identification of the critical
subsystems. For the Trento case-study, floods were identified as the most critical geomorphologic process.
6 ANALYSIS
The objective of this case-study is to show how the construction a large human-made linear structure will interact with
the flood-propagation on the plain in case of a dyke-failure and if such an interaction will increase the risk.
Flood modelling
To assess the dynamics of the interaction between the
new motorway and flooding, the required tool is a
flood propagation model. For this study the
propagation model Delft-FLS was used (Stelling,
1999.).
This model needs the following input data (required):
a detailed digital terrain model (DTM);
the Q-h relation;
a time-series of discharge and water level;
location of dyke failure;
(optional):
e bottom friction map;
e infiltration map.
Figure 5 illustrates how this data was obtained from the
integrated dataset.
Fig. 5. Overview of how the data was obtained.
remet date M
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validation
58 : International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B7. Amsterdam 2000.
