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(Article of periodic en Anglais - 2014)

Document title

Understanding river dune splitting through flume experiments and analysis of a dune evolution model

Authors(s) and Affiliation(s)

WARMINK J.J. (1) ; DOHMEN-JANSSEN C.M. (1) ; LANSINK J. (1 2) ; NAQSHBAND S. (1) ; VAN DUIN O.J.M. (1) ; PAARLBERG A.J. (3) ; TERMES P. (3) ; HULSCHER S.J.M.H. (1) ;
(1) Dept. of Water Engineering and Management, Univ. of Twente, Enschede, PAYS-BAS
(2) Witteveen + Bos Consultants, Deventer, PAYS-BAS
(3) HKV Consultants, Lelystad, PAYS-BAS

Abstract

In this paper, the process of dune splitting is investigated by carrying out laboratory experiments and by means of a sensitivity analysis using a numerical dune evolution model. In the numerical model, the AA. introduced superimposed TRIAS ripples (i.e. triangular asymmetric stoss side-ripples) on the stoss sides of underlying dunes as soon as these stoss sides exceed a certain critical length. Simulations with the model including dune splitting showed that predictions of equilibrium dune characteristics were significantly improved compared to the model without dune splitting. As dune splitting is implemented in a parameterized way, the computational cost remains low which means that dune evolution can be calculated on the timescale of a flood wave. Subsequently, the AA. used this model to study the mechanism of dune splitting. The sensitivity analysis of the dune evolution model showed that a minimum stoss side length was required to develop a strong flow separation zone

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2014, vol. 39, no9 [pp. 1208-1220]

Bibliographic references : 1 p.

Collation : 13 fig., 3 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3529

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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