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News & Views |
Quake, rubble and roll
Temporal variations in coarse river deposits are often attributed to climate change. Cosmogenic nuclide concentrations of river cobbles suggest that climate plays a subordinate role to earthquake-induced landslides in producing coarse sediments in arid Peru.
- Nathan A. Niemi
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Letter |
Sediment supply as a driver of river meandering and floodplain evolution in the Amazon Basin
Proposed engineering projects in the Amazon Basin would disrupt sediment supplies to lowland rivers. Landsat imagery of Amazonian tributaries reveals that lower sediment loads are associated with lower meander migration and cutoff rates.
- José Antonio Constantine
- , Thomas Dunne
- & Eli D. Lazarus
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Letter |
Sandstone landforms shaped by negative feedback between stress and erosion
The formation and preservation of sandstone landforms such as pillars and arches is enigmatic. Experiments and numerical modelling show that load-bearing material weathers more slowly, and thus the internal stress field can shape and stabilize sandstone landforms.
- Jiri Bruthans
- , Jan Soukup
- & Jaroslav Rihosek