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CSDMS 2022: Environmental Extremes and Earthscape Evolution
Modelling flow, sediment, and wood transport in rivers
Abstract
When a tree falls in a river promotes fundamental changes in river hydraulics and morphology, playing a relevant role in river ecology but also in flood hazards. By interacting with the flow and sediment, the instream large wood (i.e., downed trees, trunks, root wads, and branches) contributes to maintaining the river's physical and ecological integrity. However, during floods, large quantities of wood can be transported and deposited, enhancing the negative effects of flooding at critical sections like bridges. Accurate predictions of large wood dynamics in terms of fluxes, depositional patterns, trajectories, and travel distance, are still lacking, and only recently numerical models can help to this end. In contrast to other fluvial components such as fluid flow and sediment, for which numerical models have been extensively developed and applied over decades, numerical modeling of wood transport is still in its infancy. In this talk, I will describe the most recent advances and remaining challenges related to numerical modeling of instream large wood transport in rivers, with a particular focus on the numerical model Iber-Wood. Iber-Wood is a two-dimensional computational fluid dynamics model that couples a Eulerian approach for hydrodynamics and sediment transport to a discrete element (i.e., Lagrangian) approach for wood elements. The model has been widely validated using flume and field observations and applied to several case studies and has been proven to accurately reproduce wood trajectories, patterns of wood deposition, and impacts of wood accumulations during floods.
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