To gain insight into the sediment transport onto a mid-channel bar in an estuary, we measured current velocities on and along the tidal flat during six months. Our analysis shows that intertidal currents have a more pronounced three-dimensional pattern than those on shore-connected tidal flats. This has consequences for sediment transport and morphodynamics. Existing models for tidal flats underestimate flow velocities and sediment dynamics on mid-channel bars.

This study explore the impact of landslides on Alpine terrain using a landscape evolution model called Hyland, which enables long-term topographical analysis. Our finding reveal that landslides are concentrated at two specific elevations over time and predominantly affect the highest and steepest slopes, particularly along ridges and crests. This study is part of a broader question concerning the origin of accelerated erosion during the Quaternary period.

Soil strength is influenced by wetness conditions, affecting slope stability, agricultural productivity, etc. Monitoring soil moisture is essential for risk management. We used Distributed Acoustic Sensing to monitor the deformation of a grass-covered slope over two summer months. We observed both long-term drying and daily "breathing" cycles: nighttime swelling and daytime shrinkage. By integrating strain and soil moisture data, we provide new field-scale insights into soil strength evolution.

On 13 June 2023, a freestanding rock pillar on the Matterhorn collapsed after years of weakening. Our study examines this progressive destabilization by analyzing field data and integrating lab experiments into a hydro-mechanical model. We highlight the critical role of water infiltration into frozen rock, intensified by climate warming, as a widespread driver of the rising frequency of rockfalls in high mountain permafrost regions.

We designed a novel surrogate bedload monitoring system that integrates phased microphone arrays and an accelerometer for enhanced performance. By combining beamforming-based localization with amplitude calibration, we demonstrate a viable approach to enhance the reliability of bedload measurements. These findings address the key question of whether impact-based acoustic systems can be refined to provide more accurate particle size estimates and offer conceptual and methodological advances.

We combine aerial and drone Light Detection and Ranging surveys with sediment export and density measurements to assess catchment-scale mass balance in a badland environment. Landslides and crest failures are found to contribute 15 % of total mass export while affecting only 1 % of bare surfaces. Flood-condition drainage reconstruction shows low-drainage areas export 3.5 times more sediment than other slopes.

In natural rivers, flow variability and sediment heterogeneity affect how sediment grains are transported. A unique law that predicts the total amount of sediment transportable by a river for a wide range of sediment mixtures and flow conditions exists, but unclear trends remain. Two improvements to this law – a standardized onset of sediment transport and a common reference transport height across all sizes – appear to be critical to having a functional multi-grain-size total sediment load.

We use computer models to study how landscapes respond to changes in rainfall and tectonic uplift. We find that rainfall rate changes produce unique slope change reversals near the headwaters, which differ from the simpler responses caused by uplift rate changes. These reversals are more pronounced when hillslope diffusion is dominant. These findings help us understand how climate and tectonic forcing shape the landscape differently and may allow scientists to tell their effects apart in nature.