Near-bottom horizontal transfer of particulate matter in the Palamós Submarine Canyon (NW Mediterranean)

摘要: From March to November 2001, six current meters equipped with turbidimeters were moored 12 above the bottom inside Palamos submarine canyon and on adjacent slope. Horizontal particle fluxes calculated from suspended sediment concentration data. This work aims evaluate advective taking place in region, discern nature time-scales of processes involved across-margin transfer particles over study period. Near-bottom currents constrained by local topography displayed a high spatio-temporal variability. The net near-bottom transport matter was largely driven sharp increases load speed, most them attributed gravity flows. These energetic events dominated current-driven transport, which relatively weak due periodical up-canyon/downcanyon inversions along axis, complex patterns presence low loads for time at other sites. During this 8-month experiment, mid-canyon ( 1200 m depth) acted as by-pass zone, while head, directed persistently up-canyon. further heightened during major storm 2001. However, particular canyon, substantial sedimentary activity offshore export particulate also occur absence significant external forcings (storms, river floods). Human activities (deep trawling) induced flows dry calm season (spring-summer) enhanced