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Morphodynamic modelling of migrating mid-channel bars in rivers using dynamic vegetation : A case study on the Ayeyarwady River

Booij, D.G.R. (2020) Morphodynamic modelling of migrating mid-channel bars in rivers using dynamic vegetation : A case study on the Ayeyarwady River.

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Abstract:Braided rivers are highly dynamic river systems which are characterized by multiple, unstable channels and mid-channel bars. The morphological development of these systems is a result of the complex interactions between the discharge regime, sediment transport and alluvial vegetation. Numerical modelling of braided rivers is increasingly used by river managers to get insight in the behaviour of bars and river patterns and to evaluate the response of these system to interventions, such as the construction of groynes and dams. Present morphodynamic models can produce many of the large-scale morphodynamics of braided rivers. However, these models often neglect the spatial and temporal development of vegetation on bars and floodplains. Neglecting vegetation dynamics can potentially result into unrealistic model predictions because vegetation does affect the morphological development of river in nature significantly. At present, sophisticated dynamic vegetation methodologies exist which include small-scale ecological processes and progressing vegetation characteristics (e.g. growth and mortality). However, these are not easy-to-use for engineering purposes, in particular when the large-scale morphodynamic development of mid-channel bars is mainly of interest. Therefore, our objective is to model and explore the effect of incorporating vegetation dynamics on the large-scale morphodynamics of vegetated migrating mid-channel bars in dynamic rivers.
Item Type:Essay (Master)
Faculty:ET: Engineering Technology
Subject:56 civil engineering
Programme:Civil Engineering and Management MSc (60026)
Link to this item:http://purl.utwente.nl/essays/85703
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