The response of braided planform configuration to flow variations, bed reworking and vegetation : the case of the Tagliamento River, Italy

Auteur(s) et Affiliation(s)



Description :
The AA. investigated at-a-station relationships between water level and planform configuration on the Tagliamento River in northeast Italy, over a 2-year study period comprising 3 bankfull events and several small-to-medium floods. The analysis was performed on 2 long reaches, characterized by different riparian vegetation cover. Ground-based images with an hourly temporal resolution were acquired using software-controlled, digital cameras. Bars, channels, pools and vegetated patches were manually digitized on more than 100 rectified images. Sequences of constant-level images spanning the study period were used to quantify the impact of floods on the stability of at-a-station relationships and on the turnover rate of water bodies. The analysis shows that wetted area increased almost linearly with water level in both reaches. The average number of branches per cross-section peaked at intermediate flow levels, increasing from 2 at low flow up to 6-7.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2012, vol. 37, n°. 5, p. 572-582, nombre de pages : 11, Références bibliographiques : 1 p.

Date :
2012

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