Estimating continuous floodplain and major river bed topography mixing ordinal contour lines and topographic points

Abstract : Floodplain and major river bed topography govern many river biophysical processes during floods. Despite the grow of direct topographic measurements from LiDARS on riverine systems, it still room to develop methods for large (e.g. deltas) or very local (e.g. ponds) riverine systems that take advantage of information coming from simple SAR or optical image processing on floodplain, resulting from waterbodies delineation during flood up or down, and producing ordered coutour lines. The next challenge is thus to exploit such data in order to estimate continuous topography on the floodplain combining heterogeneous data: a topographic points dataset and a located but unknown and ordered contourline dataset. This article is comparing two methods designed to estimate continuous topography on the floodplain mixing ordinal coutour lines and continuous topographic points. For both methods a first estimation step is to value each contourline with elevation and a second step is next to estimate the continuous field from both topographic points and valued contourlines. The first proposed method is a stochastic method starting from multigaussian random-fields and conditional simualtion. The second is a deterministic method based on radial spline fonction for thin layers used for approximated bivariate surface construction. Results are first shown and discussed from a set of synoptic case studies presenting various topographic points density and topographic smoothness. Next, results are shown and discuss on an actual case study in the Montagua laguna, located in the north of Valparaiso, Chile.
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https://hal.archives-ouvertes.fr/hal-01678041
Contributeur : Jean-Stéphane Bailly <>
Soumis le : lundi 8 janvier 2018 - 18:43:16
Dernière modification le : lundi 3 septembre 2018 - 14:38:02

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  • HAL Id : hal-01678041, version 1

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Jean-Stéphane Bailly, Mathieu Dartevelle, Carole Delenne, Antoine Rousseau. Estimating continuous floodplain and major river bed topography mixing ordinal contour lines and topographic points . AGU2017 Fall Meeting, Dec 2017, New-Orleans, United States. 〈hal-01678041〉

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