Prediction of Short-Term Morphological Change in Large Braided River Using 2D Numerical Model
Publication: Journal of Hydraulic Engineering
Volume 142, Issue 10
Abstract
Prediction of annual changes in braided-river morphology is important to assess the performance of river-training works and channel navigability. A two-dimensional (2D) depth-averaged numerical model was used for a 12-km-long reach of the Brahmaputra River in India. Major issues addressed in the modeling included approximation of boundary conditions, design of a flood hydrograph, and evaluation of river morphology. Simulated flow depth and velocity were calibrated with the observed data under bankfull discharge conditions, and predicted bed levels were validated with observed bed levels during low-flow conditions. The model predictions of thalweg shifting for two consecutive flood seasons agreed well with observed changes obtained from satellite imagery. The calibrated model was subsequently used to assess morphological changes in different groyne fields. The best groyne field was determined based on overall performance in scouring, deposition, channel alignment, and dredging volume.
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Acknowledgments
This project was funded by the Indian Waterways Authority of India (IWAI). The authors are very grateful to this organization for providing support during the project. The help of supporting staff during the field survey and in soil sample collection are specially to be mentioned. The authors also thank the U.S. Geological Survey for providing the satellite imagery as free source.
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Published In
Journal of Hydraulic Engineering
Volume 142 • Issue 10 • October 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jun 30, 2015
Accepted: Feb 19, 2016
Published online: Jun 10, 2016
Published in print: Oct 1, 2016
Discussion open until: Nov 10, 2016
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