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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Modeling bed level changes and sediment sorting processes for pool-rifflesequences in gravel bed riv...
Modeling bed level changes and sediment sorting processes for pool-rifflesequences in gravel bed rivers
Author : MINA TABESH(1), MOHAMMAD REZA MAJDZADEH TABATABAI(2) & AMIR REZA ZARRATI(3)
ABSTRACT
One of the main features of gravel-bed rivers is the pool-riffle sequence. Investigation on morphological changes in poolriffle
topography plays a key role in environmental engineering and river training practices. In the present work, the
morphological response of a river to sediment input in a bed with pool-riffle sequence was simulated by Gstars4.0 computer
code. Experimental data presented by Hassan et al. (2006) was first used to find the model capability in predicting sediment
transport rate and bed composition changes in an alluvial bed. The model was then employed to simulate the experimental
study of morphological changes conducted by Harrison (2007). Comparison of the observed and computed results
demonstrated that the model was capable of predicting bed changes and grain sorting processes in the pool-riffle sequence
of non-uniform sediments with satisfying agreement. Results from this study showed that though sediment was deposited
in the pool first, as flow discharge increased, the pool-riffle topography approached its initial elevation. The results also
showed a gradual coarsening of the bed sediment in the pool as well as the riffle region in higher discharges.
File Size : 969,647 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 27/08/2015
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