Assessing Short Term Erosion-deposition
Processes Of The Brenta River Using
LiDAR Surveys
Author(s)
J. Moretto, F. Delai, E. Rigon, L. Picco,
L. Mao & M. A. Lenzi
Abstract
The extent and amount of erosion and deposition processes experienced by the
Brenta river after the flood events of November and December 2010, have been
assessed on the basis of DTMs derived from LiDAR surveys made before (2010)
and after (2011) these floods. The study, carried out on three sub-reaches of this
regulated gravel-bed river took advantage, beside LiDAR elevation data, two
relatively novel approaches for channel bathymetry and uncertainty calculation.
The first one allowed us to obtain the elevations within the wetted channels
while the second method allowed the quantification of uncertainty related to the
various phases of the topographic representation process. The erosion-deposition
volumetric results derived from the two years DoD differencing models
highlighted the impact of the two floods. In all the sub-reaches, erosion
processes have dominate and featured a decreasing downstream trend, being the
lower reach in a nearly equilibrium condition. The quantitative results of
morphological changes have emphasized the evidence that relevant flood events
(RI > 10 years) in high regulated gravel bed-rivers, encourage erosion rather than
deposition patterns.
Keywords: erosion-deposition, floods, LiDAR surveys, gravel-bed rivers, Italy.
Keywords
erosion-deposition, floods, LiDAR surveys, gravel-bed rivers, Italy.
Related Book
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