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(Article of periodic en Anglais - 2014)

Document title

Assessing river dynamics from 2D hydraulic modelling and high resolution grain-size distribution

Authors(s) and Affiliation(s)

VERDÚ J.M. (1) ; BATALLA R.J. (2 3 4) ; MARTÍNEZ-CASASNOVAS J.A. (2) ;
(1) Catalan Water Agency, Provença, Barcelona, ESPAGNE
(2) Dep. of Environment and Soil Sciences, Univ., Lleida, ESPAGNE
(3) Catalan Inst. for Water Research, Girona, ESPAGNE
(4) Forest Sciences Center of Catalonia, Solsona, ESPAGNE

Abstract

A new approach is proposed to study gravel riverbed stretches at high resolution. During a two-year period, flood events in the River Isábena (Central Pyrenees) were reproduced using a steady-state 2D hydraulic model (Hydro2de) with the aim of studying gravel riverbed dynamics. The parameters included detailed grain size at 1.5 x 1.5 m resolution, topographic data and field measurements along an 11 km stretch. Discharge data were obtained from 2 gauging stations and velocity and maximum water width were measured at 15 control cross-sections. Observed and modeled results show good agreement. Additionally, shear stress for several discharges and related critical shear stress were compared for the whole river stretch. The initiation of sediment motion occurred at a lower discharge in the lower stretches than in the middle and upper stretches, where the mean grain size was coarser. This matched riverbed erosion measures. Results were obtained at 1.5 × 1.5 m resolution, showing a good potential as bases for subsequent fluvial applications (i.e. entrainment, channel scour)

Source

Article of periodic

published at : Zeitschrift für Geomorphologie / ISSN 0372-8854 / CODEN ZGMPAG

Editor : Gebruder Borntraeger, Stuttgart - ALLEMAGNE (1925)

Millesime : 2014, vol. 58, no1 [pp. 95-115]

Bibliographic references : 27 ref.

Collation : 7 fig., 6 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 8829

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1127/0372-8854/2013/0107

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
Refdoc record number (ud4) : 28338047 : Permanent link - XML version
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