Abstract Over the past 50 years, rivers have become increasingly important vectors for plastic pollution. Lowland riverbeds exhibit coherent morphological features including ripple and dune bedforms, which transport sediment downstream via well-understood processes, yet impact of on mechanics is largely unknown. Here we use flume tank experiments to show that when particles are introduced sandy...

In meandering rivers, interactions between flow, sediment transport, and bed topography affect diverse processes, including bedform development channel migration. Predicting how these the spatial patterns magnitudes of deformation in rivers is essential for various river engineering geoscience problems. Computational fluid dynamics simulations can predict morphodynamics at fine temporal scales ...

Abstract Seabed roughness in the dynamic near‐shore environment is continuously modified by interplay of physical and biological processes including bedform morphodynamics bioturbation. We introduce a novel regime‐state framework to determine dominant modifier seabed based on observed or estimated forcing, which are classified critical Shields parameter wave mobility thresholds. The applied set...

Abstract Hyporheic exchange (HE) contributes to the biogeochemical turnover of macro- and micro-pollutants in rivers. However, spatiotemporal complexity variability HE hinder understanding its role overall functioning riverine ecosystems. The present study focuses on investigating bacterial diversity sediment morphology using a multi-flume experiment. A fully coupled surface–subsurface numerica...

Abstract. Conceptual ice stream land systems derived from geomorphological and sedimentological observations provide constraints on ice–meltwater–till–bedrock interactions palaeo-ice beds. Within these systems, the spatial distribution formation processes of ribbed bedforms remain unclear. We explore conditions under which may develop their organization with (i) an experimental model that repro...

Numerous questions and problems on Earth with respect to other planets arise from morphodynamic processes caused by sediment movements driven flows of fluids, such as water, air gases. A surface opposes the current a resistance that is determined its skin or grain roughness. As soon sand waves, ripples and/or dunes, are formed, these bedforms cause further flow, so-called form Dependent dimensi...

Abstract Sedimentary structures in ancient deposits are clues to reconstruct past geohazards. While parallel lamination formed by plane beds is one of the most common sedimentary event such as turbidites, formative conditions for remain unclear. In literature, two types (upper and lower beds) exist supposed develop under different shear stresses, particle sizes, flow regimes. Here, we present n...