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Sediments and sedimentary processes

机译：沉积物和沉积过程

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2477 Geomorphic and sedimentary impacts on the continental shelf after accumulated dredge disposal from rio de janeiro harbor, brazil G.T.M. Dias, L.H.P. Fontana, C.G. Silva et al. Revista Brasileira de Geofisica 2019 37/4 Universidade Federal Fluminense, Caixa Postal 106051, Niteroi, RJ, CEP 24230- 971, Brazil Marine dredging is a sub-aquatic excavation activity executed around the globe for various purposes by many industries. The negative impacts of dredged material discharge on benthic ecosystems are diverse. Researches on the results of dredging on estuarine geomorphology and its sedimentary regime are usual. Still, the results of dumping dredged material off the coast, in the Brazilian continental shelf, are not easily found in the literature. The present research evaluated the geomorphic disturbance resulted from discharging dredged material from Rio de Janeiro Harbor in the inner Rio de Janeiro continental shelf. Grain size analysis of the dredged and dumped sediments was compared to the inner shelf original seabed sediments. The geomorpho-logical impact was evaluated through bathymetric and high resolution seismic and side scan sonar imagery methods. Obtained data revealed significant geomorphologic changes on the offshore bottom caused by the accumulation of compacted mud from the dredge site underlying the recent soft mud bottom of the harbor area. Besides the morphological sea bottom disturbance, sediment accumulation, and local grain size characteristics exhibited significant change, potentially impacting the surrounding benthic environment.
机译：2477从巴西G.T.M.里约热内卢港累积的挖泥机处置后对大陆架的地貌和沉积影响迪亚斯，L.H.P.丰塔纳C.G. Silva等。 Revista Brasileira de Geofisica 2019 37/4 Universidade Federal Fluminense，Caixa Postal 106051，Niteroi，RJ，CEP 24230-971，Brazil海上疏ed是一种水下水下挖掘活动，在全球范围内被许多行业用于各种目的。疏material的物料排放对底栖生态系统的负面影响是多种多样的。通常对河口地貌及其沉积状况进行疏the研究。尽管如此，在文献中仍不容易找到在巴西大陆架上向海岸倾倒疏off材料的结果。本研究评估了从里约热内卢大陆架内里约热内卢港口排放的疏material物引起的地貌扰动。将疏and和倾倒的沉积物的粒度分析与内架原始海底沉积物进行了比较。通过测深和高分辨率地震及侧面扫描声纳成像方法评估了地貌学影响。所获得的数据表明，由于海港区最近的软泥底部下面的挖泥工地的压实泥浆堆积，造成了近海底部的重大地貌变化。除形态上的海底扰动外，沉积物堆积和局部粒度特征还表现出显着变化，可能会影响周围的底栖环境。

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    《Oceanographic Literature Review》 |2020年第3期|523-525|共3页
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