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Mud deposits at Cassino beach: role of dredging

机译：Cassino海滩的泥矿床：疏浚的作用

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Mud deposits on Cassino beach are associated with waves generated from storms during cold front passages and extratropical cyclones from the southern quadrant. During such episodes fluid mud deposited at the shoreface and surf zone is transported towards the surf zone and the sandy beach prism. The first mention on the origin of mud has always attributed a source exclusively natural for the deposits. However, new interpretations and recent data indicate that the increase in dredged volumes over the years increased the frequency of mud depositions. In order to verify this association, records of dredged and discarded volumes in the Port of Rio Grande and Cassino beach shoreface were analyzed. Maps of bottom types, silt and clay ratio, and fluid mud thickness obtained from superficial samples and sediment cores between 4 and 15 m water depth at the time of the 1998 impact were also reanalyzed. Current conditions near the dumping sites in the estuary and inner shelf in 1998 were reconstructed by hindcast based on reanalysis data and an ADCP anchored 15 m off the Rio Grande coast. In order to verify the effect of the passage of a cold front on the bottom near the ocean dumping site, data from two mooring stations made on the crest and swale of a sand ridge field were considered. To further understand the disposal of the dredged material, a particle transport model was created for two periods related to the depositional events. In the period of 1998, it was simulated the disposal of dredged material on two locations, one with the disposal of 640,000 m(3)of sediment inside the estuary at 8 m of depth and, the other, with 2.3 million m(3)of disposal material, at 13 m depth in the shoreface. The simulation at depth of 19 m, for the dumping site of 2014 considered the disposal of 1,000.000 m(3)at 19 m water depth. The occurrence of massive concentrations of an estuarine gastropod associated with the deposits at the beach led to a literature search on their occurrence in the
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