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PORTAIL D'INFORMATION GÉOGRAPHIQUE

TerEx Toolbox for semi-automated selection of fluvial terrace and floodplain features from lidar

Auteur(s) et Affiliation(s)

STOUT, J.C.
The Univ. of Melbourne, Dept. of Resource Management and Geography, Carlton, Australie
Utah State Univ, Dept. of Watershed Sciences, Logan, Etats-Unis
BELMONT, P.
Utah State Univ, Dept. of Watershed Sciences, Logan, Etats-Unis


Description :
The AA. introduce a novel tool that accommodates user-defined parameters including, a local-relief threshold selected by a variable-size moving window, minimum area threshold, and maximum distance from the channel to identify and map discrete terrace and floodplain surfaces. They validate the tool in 2 locations where terrace maps were previously developed via manual digitization from lidar and extensive field mapping campaigns. The tool is also tested on 6 different types of rivers to provide examples of starting selection parameters. Generally, the tool provides a high quality draft map of terrace and floodplain surfaces. The AA. find that the tool functions best in catchments where the terraces are spatially extensive, with distinct differences between the terrace and floodplain. The most challenging environments for semi-automated terrace and floodplain mapping include steep catchments with dense riparian vegetation, and very small terraces. They then apply the tool to map terraces and floodplains in the Root River watershed, southeastern Minnesota and generate exceedance plots for terrace heights. These plots provide a first pass analysis to indicate the tributaries and reaches of the river where terraces constitute a significant source of sediment.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2014, vol. 39, n°. 5, p. 569-580, nombre de pages : 12, Références bibliographiques : 1 p.

Date :
2014

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais
Droits :
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