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(Article of periodic en Anglais - 2013)

Document title

Morphological changes on meander point bars associated with flow structure at different discharges

Authors(s) and Affiliation(s)

KASVI E. (1) ; VAAJA M. (2) ; ALHO P. (1 2) ; HYYPPÄ H. (2 3) ; KAARTINEN H. (4) ; KUKKO A. (4) ;
(1) Dept. of Geography and Geology, Univ., Turku, FINLANDE
(2) Aalto Univ., School of Science and Technology, Dept. of Surveying, Espoo, FINLANDE
(3) Metropolia Univ. of Applied Science, Civil Engineering and Building Services, Helsinki, FINLANDE
(4) Finnish Geodetic Inst., Dept. of Remote Sensing and Photogrammetry, Masala, FINLANDE

Abstract

This study investigates the impact of flow structure of different discharges on meander point bar morphology. The study reach is located in northern Finland on the meandering, unregulated Pulmanki River in the valley of Pulmanki. The AA. carried out mobile and terrestrial laser scanning campaigns before and after a flood on 2 sandy-bed point bars. Between the scans, the flow structure was examined using an Acoustic Doppler Current Profiler at 3 flow stages. The results indicated that a meander point bar both affects and in turn, is itself modified by the flow at different discharges. The lower flow stages also have a significant effect on point bar morphology, especially on deposition over the bar head. Secondary circulation is responsible for scroll bar formation on the point bar margin beyond the apex. Finally, the shape of the bend and the grain size distribution control the impacts of the flow structure, leading to divergent morphologies of point bars with certain generic features

Source

Article of periodic

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

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

Millesime : 2013, vol. 38, no6 [pp. 577-590]

Bibliographic references : 2 p.

Collation : 10 fig., 5 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3303

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