Network concepts to describe channel importance and change in multichannel systems : test results for the Jamuna River, Bangladesh

Auteur(s) et Affiliation(s)



Description :
The AA. developed a semi-automatic method to derive a chain-like directional network from images that represent the multi-channel river and to connect individual network elements through time. The Jamuna River was taken as an example with a series of Landsat TM and ETM+ images taken at irregular intervals between 1999 and 2004. They quantified the overall importance of individual channels in the entire network using a centrality property. Centrality showed that 3 reaches can be distinguished along the Jamuna with a different network character. Based on the centrality they calculated a weighted braiding index that represents the number of important channels in the network, which is about two in the Jamuna River and which is larger immediately after floods. It is concluded that the network measure centrality provides a novel characterization of river channel networks, highlighting properties and tendencies that have morphological significance.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2014, vol. 39, n°. 6, p. 766-778, nombre de pages : 13, Références bibliographiques : 41 ref.

Date :
2014

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