An understanding of rates and mechanisms of incision and knickpoint retreat in bedrock rivers is fundamental to perceptions of landscape response to external drivers, yet only sparse field data are available. Here we present eye witness accounts and quantitative surveys of rapid, amphitheatre-headed gorge formation in unweathered granite from the overtopping of a rock-cut dam spillway by small-...

Mudstones make up the majority of the geological record. However, it is difficult to reconstruct the complex processes of mud deposition in the laboratory, such as the clumping of particles into floccules. Using flume experiments, we have investigated the bedload transport and deposition of clay floccules and find that this occurs at flow velocities that transport and deposit sand. Deposition-p...

We show that a freshly sedimented bed composed of spherical grains settles and creeps forward over extended periods under an applied hydrodynamic shear stress τ∗, which is below the critical value τ∗ c for bedload transport. The rearrangements are found to last at least over millions of times the sedimentation time scale of a grain in the fluid. Compaction occurs throughout the bed, but creep i...

In this paper, we are concerned with models for sedimentation transport consisting of a shallow water system coupled with a so called Exner equation that described the evolution of the topography. We show that, for some model of the bedload transport rate including the well-known Meyer-Peter and Müller model, the system is hyperbolic and, thus, linearly stable, only under some constraint on the...

Although plot-scale erosion experiments are numerous, there few studies on constructed landforms. This limits the understanding of their long-term stability, which is especially important for planning mined land rehabilitation. The objective this study was to gain insight into processes in a 30 × m trial plot mine waste rock dump tropical northern Australia. relationships between rainfall, runo...

Bedload sediment transport in rivers can cause impacts, such as bed erosion/deposition, sandbank formation and changes flow capacity. sampling techniques have limitations related to spatial temporal resolution. These constraints are more relevant with dunes high transport. This paper presents a comparison between bedload rates estimated direct indirect methods river sand dunes. The case study a...

Gravity-driven size segregation is important in mountain streams where a wide range of grain sizes are transported as bedload. More particularly, vertical multi-scale process that originates interactions at the scale particles with morphological consequences on reach scale. To address this issue, volume-averaged multi-phase flow model for immersed bidisperse granular flows was developed based a...

Abstract. Channel processes under high-magnitude flow events are of central interest to river science and management as they may produce large volumes sediment transport geomorphic work. However, bedload these conditions poorly understood due data collection limitations the prevalence physical models that restrict feedbacks surrounding morphologic adjustment. The extension mechanistic equations...