Fluvial processes in the context of "Marajó Archipelago"

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👉 Fluvial processes in the context of Marajó Archipelago

The Marajó Archipelago (Portuguese: arquipélago do Marajó) is the largest fluvial-maritime archipelago on Earth. Located in the Brazilian states of Amapá and Pará, the island group has approx. 2,500 islands.

The main island of the archipelago also has the name of Marajó, having about 42,000 km² of area, considered, due to its size, as the largest coastal island in Brazil, extending from the mouth of the Amazon River, between the Line of the Equator and the parallel 1.55º south latitude and, in the E/W direction between the meridians 47º and 53º west longitude, until the Atlantic Ocean.

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Fluvial processes in the context of Fluvial seismology

Fluvial seismology is the application of seismological methods to understand river processes, such as discharge, erosion, and streambed evolution. Flowing water and the movement of sediments along the streambed generate elastic (seismic) waves that propagate into the surrounding Earth materials. Seismometers can record these signals, which can be analyzed to illuminate different fluvial processes such as turbulent water flow and bedload transport. Seismic methods have been used to observe discharge values that range from single-digits up through tens of thousands of cubic feet per second (cfs).

An experiment in 1990 in the Italian Alps was one of the earliest to demonstrate that seismometers could detect discernible fluvial signals within the seismic noise generated by flow. Six seismometers recorded average velocity of ground oscillations along an alpine river that was also monitored for discharge and bedload with a sediment trap. They determined the lowest flow values require to initiate and maintain bedload transport. Since then, fluvial seismology has become a rapidly growing area of research.

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