Simulating Floods In Urban Watersheds:
Hydrodynamic Modelling Of Macro,
Micro-drainage And Flows Over Streets
Author(s)
M. G. Miguez, F. C. B. Mascarenhas, J. H. A. Prodanoff
& L. P. C. Magalhães
Abstract
Floods in urban environments generally require a different mathematical treatment
in order to achieve an adequate simulation technique. When dealing with these
river catchments, it must be taken into account a set of features that distinguish
such phenomena from rural basin flood flow simulations. It is quite usual that
rainfall run-off spills out of the macro-drainage net, causing inundation at urban
landscapes, like streets, squares, parks and so on. The hydrodynamic modelling in
such situations must go towards a systemic approach. Several models available
nowadays focus mainly on the macro-drainage net, evaluating only its capacity to
convey flows resulting from heavy rainfalls. Usually, these models are not able to
simulate the hydraulic behaviour of common urban landscapes. MODCEL is a
hydraulic-hydrological distributed model that seems to apply to those situations
where traditional approaches fail to simulate urban catchments flood flows. One of
the major advantages of that model lies on the fact that streets may represent
channels, squares and parks can be considered as water storage areas, microdrainage
communicates to macro-drainage through gullies and manholes, trying to
best reproduce what happens in urban watersheds subjected to flooding. In this
work it is also presented a case study regarding a sub-basin in Rio de Janeiro state,
Brazil. Model calibration made use of flood maps and river gauges data. The
model was also validated for another rainfall input. Finally, some flood control
measures were implemented in the model in order to compare results with present
situation. The model showed to be a valuable tool for flood management.
Keywords: urban environment, flood management, mathematical modelling.
Keywords
urban environment, flood management, mathematical modelling.
Related Book
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