IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Predicting morphodynamic processes in braided rivers°™°™based on an experimental river
Predicting morphodynamic processes in braided rivers°™°™based on an experimental river
Author : HAIYAN YANG(1), BINLIANG LIN(1,2)
ABSTRACT
Numerical models provide considerable assistance in the investigation of the complicated processes in natural rivers. In
the present study, a physics-based two-dimensional model has been employed to simulate the morphodynamic processes
in braided rivers based on an experimental braided river in lab. The model applies the basic hydrodynamic and sediment
transport principles with bed morphology deformation and a TVD scheme for solving trans-critical flows. A multiple bed
layer technique has been applied to represent the vertical sediment sorting process. The non-equilibrium transport process
of graded bed load sediment is modelled using a multiple fractional method. The model has been used to predict an
experimental river with bed load. The river evolution processes and braiding mechanisms are investigated and compared
with the experimental and natural rivers. Four types of avulsions have been found in the braided pattern evolution process,
and they represent the primary ways in which channels change in the river. The growth and relationship of active braiding
intensity and total braiding intensity show similar trends to those of the experimental river. The model demonstrated its
potential to predict the morphodynamics in natural rivers.
File Size : 390,782 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 : 18/08/2015
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