Print Email Facebook Twitter Secondary currents and morphological evolution in a bifurcated channel Title Secondary currents and morphological evolution in a bifurcated channel Author Anonymous, A. Contributor van der Wal, M. Corporate name The University of Nottingham Project River Survey Project Date 1996-10 Abstract In studies of flow structures on single-thread meandering rivers, secondary currents have been shown to have a large influence on the morphological development of meander bends. Until this joint study between FAP 24 and the University of Nottingham, UK, there had been few similar studies carried out on the influence of secondary currents on large braided rivers such as the Brahmaputra River in Bangladesh. As a consequence of this lack of fieldwork, our understanding of braided river behaviour and the development of predictive tools have been impeded. This document reports on a series of field surveys to investigate the flow distributions around a braid bar in the Brahmaputra River near Bahadurabad. Results demonstrate linkages between large scale secondary current cells and the pattern of primary flow and the pathways of concentrated suspended sediment around the bar. Patterns observed along the flanks of the braid bar curved anabranch are similar to those observed in single-thread meandering channel bends. Patterns observed at the flow bifurcation upstream of the bar demonstrate how the secondary currents influence the development of the bifurcation through their effect on the near bed primary flow pattern and sediment transport. The results further demonstrate that an Acoustic Doppier Current Profiler is a powerful instrument, capable of investigating three-dimensional coherent flow structures in large rivers. A copy of all the data presented in this document is contained on a 3.5" diskette in ASCII text format attached to the back cover. Subject river surveymorphologymeandering riverssecondary currentsBrahmaputra Riverbraid barflow distributionsbifurcated channel Classification TPE8000TKJ4000 To reference this document use: http://resolver.tudelft.nl/uuid:3adb2f3d-7c0b-47e1-ba82-b73b6d566ee4 Publisher The University of Nottingham Coordinates 25.235832,89.678945 Part of collection Hydraulic Engineering Reports Document type report Rights (c) 1996 FAP24 / The University of Nottingham Files PDF Wal_van_der1996.pdf 27.25 MB Close viewer /islandora/object/uuid:3adb2f3d-7c0b-47e1-ba82-b73b6d566ee4/datastream/OBJ/view