Models of fluvial erosion have a long history in landform evolution modeling. Interactions between rivers and processes acting at hillslopes (e.g., landslides) are receiving growing interest in this context. While present-day computer capacities allow for applying such coupled models, there is still a scaling problem when considering rivers as linear elements on a topography. Based on a reinterpretation of old empirical results, this study presents a new approach to overcome this problem.

We non-dimensionalized a commonly used model of landscape evolution. Whereas the original model included four parameters, we obtained a dimensionless form with a single parameter. Working with this form saves computational time and simplifies theoretical analyses.

We calculated the probability of sediment transport in coarse-grained mountainous streams in the Alps and the Andes where data on water discharge is available. We find a positive correlation between the predicted probability of sediment transport and the grain size sorting of the bed material. We suggest that besides sediment discharge, the bedload sorting exerts a significant on the mobility of sediment and thus on the stability of gravel bars in mountainous streams.

Fluvial deposits record changes in water and sediment supply. As such, they are often used to reconstruct the tectonic or climatic history of a basin. In this study we used an experimental setting to analyze how fluvial deposits register changes in water or sediment supply at a confluence zone. We provide a new conceptual framework that may help understanding the construction of these deposits under different forcings conditions, a crucial information to correctly infer the history of a basin.

Sandbars are ubiquitous features the surf zone. They are rarely straight and more often develop crescentic shapes. Their presence affects wave transformation and can result in deadly rip currents. We use a numerical analysis to show the conditions leading to the different configurations and under which conditions patterns emerge.

Earthquakes can be responsible for up to half of the long-term erosion in a mountain range. However, singular events are hard to identify in geological records and landscapes. We use a numerical model of a tectonically active landscape to demonstrate that mixing of regolith within orogens reduces the time scale of the earthquake's perturbation of cosmogenic nuclide concentrations, resulting in them potentially being unrecorded potentially due to the low temporal resolution of exhumation records.

We investigated the effect of tides on morphodynamic evolution of bifurcations in tide-influenced deltas. Using results from a numerical morphodynamic model (Delft3D), we found that tides cause less asymmetric bifurcations, and thereby keep both downstream channels to open. Our results explain why avulsion rarely occurs in tide-influenced deltas, whereas it occurs more often in river-dominated deltas.

In this paper, we introduce a new technique that can be used to identify how sediments were transported to their place of deposition (termed the transport mode). The traditional technique is based on the size of sediment grains, ours on the size and the shape. The new method indicates the transport mode with less ambiguity, and therefore improves our ability to extract information such as climate from the past, from sediment deposits.

We present infrasonic and seismic array data of a powder snow avalanche, that released on 5 February 2016, in the Dischma valley nearby Davos, Switzerland. Combining information derived from both arrays we show how infrasound and seismic energy are radiated from different sources acting along the path. Moreover, infrasound transmits to the ground and affect the recorded seismic signal. Results highlight the benefits of combined seismo-acoustic array analyses, for monitoring and research.

Estimating suspended sediment load in rivers is complex due to the variability in the observed concentrations. We present a model for soil erosion and sediment transport in river basins that accounts for the main sources of this variability and can capture the scatter of the rating curve in a pre-alpine basin. We found that sediment load depends on the variability in space of erosion drivers, as this affects erosion rates and the location and connectivity to the channel of the erosion areas.

Changes in topographic structure affect the geographic ranges of organisms by fragmenting habitats, which can lead to new species, and shrinking habitats, which increase extinction rates. We developed an approach and applied a new modelling tool to assess how changes in the course of a river impact riverine species. This first application of the tool demonstrates that following climatic and tectonic change, species can proliferate or diminish, depending on the details of topographic structure.

Spring-fed streams throughout volcanic regions of the western United States are wider than runoff-fed streams with similar flow levels. We used high-resolution satellite imagery in combination with flow and climate data to examine the relationship between wood loading and stream width in 38 spring-fed and 20 runoff-fed streams. This study identifies distinct wood dynamics in spring-fed and runoff-fed streams and a strong correlation between stream width and wood length in spring-fed streams.

In areas covered by sediments, the unknown bedrock surface can be expressed as a mathematical function in space. We used sparse point information of the vertical depth to the bedrock surface together with general digital information (viz digital elevation maps; geological maps) to minimize the estimation uncertainties. Based on local geology, we used the relation between horizontal distance to the nearest bedrock outcrop as a secondary information to minimize the estimation uncertainties.