Effects Of Topographic Data Resolution And
Spatial Model Resolution On A Bi-dimensional
Hydro-morphological Model
Author(s)
E. Frank, M. Montoya & S. Fattorelli
Abstract
Uncertainties in topographic data may have a significant influence on
morphological and hydraulic predictions. In this work, the effects of topographic
data resolution and model resolution (dimension of the cell) on the results of a
morphological and sediment transport model are analysed using the
morphological bi-dimensional curvilinear model MIKE 21C. The study was
carried out on the river Torre, located in north-east Italy. Two sources of
topographic data were used to create model bathymetry, one based on
high-resolution LiDAR (Light Detection And Ranging) data, and the second on
river cross-section data. Digital elevation models were created with these
topographic data, in order to test the effect of various spatial resolutions.
Numerical simulation was carried out for each digital elevation model with
different cell dimensions. The impact of topographic information on hydraulic
and morphological model results was evaluated by means of three criteria: a)
comparison of hydrodynamic results, b) analysis of morphologic variations along
the watercourse, c) position of erosional and depositional zones along the
watercourse. This study emphasises the importance of input quality information
for reliable results of morphological and sediment transport models. Criteria for
selecting the optimal dimensions of the cell model are suggested, based on the
quality of available data.
Keywords: topographical resolution, LiDAR, hydro-morphological model,
sediment transport.
Keywords
topographical resolution, LiDAR, hydro-morphological model,
sediment transport.
Related Book
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