An assessment of natural and manmade hazard effects on the underwater light field of the Doce River continental shelf

The Science of the Total Environment
Keyla Thayrinne Oliveira CoimbraCarlos Roberto de Souza Filho

Abstract

Natural and manmade disasters have occurred more frequently due mainly to climate change and human pressure for productivity. One of the world's vastest disasters in the mining industry occurred due to the collapse of the Fundao dam, Brazil, which discharged about 43 million m3 of iron tailings at the Doce River basin. Extreme natural events also affect this region and provoke substantial mass movement and substantial floods in the Doce River basin, and flow of anomalous volumes of sediments in its mouth. The extent of tailings and the sediment flow in these events were approached in previous research. However, their effects on the penetration of sunlight into the water column in the coastal region are unknown. Here, we evaluate the effects of an extreme natural event and a manmade disaster on the light regime of the water column at the Doce River mouth, using remote sensing data. In both events, the spatial and temporal distribution of suspended particulate matter (SPM), diffuse light attenuation coefficient (Kd490) and Euphotic Zone (Zeu) were analyzed. During the natural event, light penetration into the water column was strongly attenuated (Kd490: 0.35 m-1; SPM: 8.81 g/m3) but re-established after 1 month due to sediment de...Continue Reading

Citations

Dec 12, 2020·The Science of the Total Environment·Cristiane Dos Santos VergilioCarlos Eduardo de Rezende
Nov 16, 2020·Environmental Pollution·Keyla Thayrinne Oliveira CoimbraCarlos Roberto de Souza Filho
Mar 23, 2021·Marine Pollution Bulletin·Hermano M QueirozTiago O Ferreira
May 10, 2020·The Science of the Total Environment·Ronaldo B Francini-FilhoFabiano L Thompson
Sep 2, 2021·The Science of the Total Environment·Ryan AndradesJean-Christophe Joyeux

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