A5001010034- Geological formations and processes
- Geology and Paleoclimatology Research
- Hydrology and Sediment Transport Processes
- Geological and Geophysical Studies
- earthquake and tectonic studies
- Oceanographic and Atmospheric Processes
- Landslides and related hazards
- Hydrology and Watershed Management Studies
- Maritime and Coastal Archaeology
- Soil erosion and sediment transport
- Underwater Vehicles and Communication Systems
- Microplastics and Plastic Pollution
Bundesministerium für Land- und Forstwirtschaft, Umwelt und Wasserwirtschaft
2024
TU Wien
2020-2024
Bundesamt für Wasserwirtschaft
2024
BOKU University
2020
Abstract Here we show how major rivers can efficiently connect to the deep-sea, by analysing longest runout sediment flows (of any type) yet measured in action on Earth. These seafloor turbidity currents originated from Congo River-mouth, with one flow travelling >1,130 km whilst accelerating 5.2 8.0 m/s. In year, these eroded 1,338-2,675 [>535-1,070] Mt of submarine canyon, equivalent 19–37 [>7–15] % annual suspended flux present-day rivers. It was known earthquakes trigger...
Plastic pollution is a growing global concern, with significant implications for marine ecosystems. While microplastics (1,000 km. These are the longest sediment flows yet measured in action on Earth, and they eroded carried mass of terrestrial organic carbon similar to that buried each year oceans. However, despite their significance natural particle transport, it remains unclear how efficiently carry anthropogenic particles, such as microplastics, deep sea.This study presents first dataset...
Abstract Landslide-dams, which are often transient, can strongly affect the geomorphology, and sediment geochemical fluxes, within subaerial fluvial systems. The potential occurrence impact of analogous landslide-dams in submarine canyons has, however, been difficult to determine due a scarcity sufficiently time-resolved observations. Here we present repeat bathymetric surveys major canyon, Congo Canyon, offshore West Africa, from 2005 2019. We show how an ~0.09 km 3 canyon-flank landslide...
Submarine canyons and channels are globally important pathways for sediment, organic carbon, nutrients pollutants to the deep sea, they form largest sediment accumulations on Earth. However, studying these remote submarine systems comprehensively remains a challenge. In this study, we used only complete-coverage repeated bathymetric surveys yet very large system, which is Congo Fan off West Africa. Our aim understand channel-modifying features such as subaqueous landslides, meander-bend...
The largest canyons on Earth occur the seafloor, and seabed sediment flows called turbidity currents play a key role in carving these submarine canyons. However, processes by which erode are very poorly documented understood. Here we analyse first detailed time-lapse bathymetric surveys of large canyon, its continuation as less-deeply incised channel. These also most comprehensive before after major canyon-channel flushing current. unique field data come from Congo Submarine Fan offshore...
Abstract Turbidity currents carve the deepest canyons on Earth, deposit its largest sediment accumulations, and break seabed telecommunication cables. Powerful canyon‐flushing turbidity sensors placed in their path, making them notoriously challenging to measure, thus poorly understood. This study provides first remote measurements of flows, using ocean‐bottom seismographs located outside flow's destructive revolutionizing flow monitoring. We recorded internal dynamics longest flows yet...
Morphometric characteristics play an important role in the classification and modelling of fluvial systems. With increasing numbers detailed surveys subaquatic canyon channel systems lakes, reservoirs, oceans extra-terrestrial systems, previous research has repeatedly tried to draw parallels between poorly understood much studied subaerial Often, these studies only considered a few morphometric (e.g., bed slope, bankfull width, centreline radius bend apices, depth), because efficient tool...
Abstract Here we document for the first time how major rivers connect directly to deep-sea, by analysing longest runout sediment flows (of any type) yet measured in action. These seafloor turbidity currents originated from Congo River-mouth, with one flow travelling >1,130 km whilst accelerating 5.2 8.0 m/s. In year, these eroded 1-2 3 of just submarine canyon, equivalent 14-28% annual global-flux rivers. It was known earthquakes trigger canyon-flushing flows. We show river-floods also...
Seabed telecommunication cables can be damaged or broken by powerful seafloor flows of sediment (called turbidity currents), which may runout for hundreds kilometres into the deep ocean. These have potential to affect multiple near-simultaneously over very large areas, so it is more challenging reroute traffic repair cables. However, cable-breaking currents that ocean were poorly understood, and thus hard predict, as there no detailed measurements from these in action. Here we present first...
Subaquatic channels, situated in lakes, fjords, submarine canyons and on deep-sea fan systems, exhibit diverse morphometric characteristics controlled by sediment transport processes, particularly turbidity currents. These processes play a significant role transporting sediment, organic carbon, nutrients, pollutants pose hazards to critical infrastructure. This study examines balanced set of subaquatic channels across various settings, sizes, locations, employing novel data harmonization...
<p>Turbidity currents form many of the largest sediment accumulations, longest channels, and deepest canyons on our planet. These seabed avalanches can be very (> 10 m/s) fast, runout for hundreds kilometres, break cables that now backbone internet global data transfer. It was once thought detailed monitoring turbidity in action impractical, ensuring these flows were relatively poorly understood. However, a series recent projects have used new approaches technology to...
The increasing plastic pollution of the world’s oceans represents a serious threat to marine ecosystems and has become well-known topic garnering growing public attention. global input waste into is estimated be approximately 10 million tons per year predicted rise by one order magnitude 2025. More than 90% that enters thought end up on seafloor, seafloor sediment samples show plastics are concentrated in confined morphologies sedimentary environments such as submarine canyons....
<p>Submarine canyons and channels include the largest sediment transport systems on our planet. They are an important pathway for sediment, organic carbon, nutrients pollutants to deep sea. However, it is challenging study these submarine locations, especially larger seafloor, they remain poorly understood. Here we use first extensive time-lapse bathymetric surveys of Congo Submarine Fan (offshore West Africa), one fans in world. Channel-modifying processes (such as landslides,...