Modelling vegetation-impacted morphodynamics in braided rivers
NIWA is developing numerical models for predicting how the morphology of braided rivers responds to flow regulation and invasive exotic woody vegetation.
This numerical simulation of the evolution of a fluvial reach at laboratory scale starts from an initially straight channel (Tal and Paola, 2010), using the modified GIAMT2D model. The first phase is about the development of a braided network in a bare, cohesionless sand bed. The second phase is composed of 31 cycles of vegetation growth at low flow, each one followed by a short high-flow phase which removes vegetation within channels, by which the braiding morphology progressively reduces to much a more static morphology with reduced braiding intensity. For further information visit niwa.co.nz/node/111731