Can The Basin Morphology Alone Provide An
Insight Into Floodplain Delineation?
Author(s)
S. Manfreda, A. Sole & M. Fiorentino
Abstract
The present research was aimed to evaluate flooding exposure by exploiting the
potential of morphological indices (eg drainage area, local slope, curvature,
etc). It was found that the areas exposed to flood inundation may be delineated
quite well by adopting a modified topographic index computed from DEMs
(Digital Elevation Models). Since the modified topographic index is sensitive to
the spatial resolution of the digital elevation model, the scale dependence is
investigated showing an increase in the performances of the method with the
resolution of the DEMs. The procedure proposed is tested over the Arno river
basin using the existing documentation on flooding exposure produced by the
local River Basin Authorities. The use of the proposed modified topographic
index may represent a useful and rapid tool in delineating the flood prone areas
in ungauged basins and in areas where expensive and time consuming
hydrological-hydraulic simulations are not possible.
Keywords: flooding areas, topographic index, digital elevation model (DEM).
1 Introduction
Planning and territorial management must take into account exposure to natural
hazards in order to implement risk reduction programs for human life and public
safety [8]. In this context, the delineation of the areas subject to flood
inundations raises complex problems regarding the definition of hydrological
forcing and the parametrization of models for flood wave propagation [3, 4, 10].
The increasing availability of new technologies for the measurement of
surface elevation (eg GPS, SAR interferometry, radar and laser altimetry) led to an increase in the attraction of DEM-based hydrogeomorphic models.
Keywords
flooding areas, topographic index, digital elevation model (DEM).
Related Book
Other papers in this volume
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