Publications by authors named "Robert Bofah-Buoh"

The freshwater ecological characteristics in terms of the daily inventory of thermal stratification, spatial variation of O distribution, and the mobility of potentially toxic elements (PTEs) at the water sediment interface (WSI) are prudent freshwater assessment indices for water quality management protocol. The study conducted daily observations within a monsoon-influenced region, utilizing high-resolution techniques such as HR Peeper, Yellow Spring Instrument (YSI), and ZrO-Chelex diffusive gradient technology (DGT) to analyze PTEs, specifically phosphorus (P) and iron (Fe),within the water-sediment interface (WSI) under different temperatures and oxygen conditions. The 66-day field study showed that high thermal structure contributed significantly to production Fe ions and P from sediment under reductive dissolution of FeOOH.

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Blackwater occurs every winter in reservoirs with Eucalyptus plantations. The complexation reaction between ferric iron (Fe) and Eucalyptus leachate tannic acid from logging residues (especially leaves) is the vital cause of water blackness. However, the effect of Eucalyptus leaf leaching on the dynamic of iron in sediments and its contribution to reservoir blackwater remain unclear.

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The management of black water depends primarily on the knowledge of the dynamics of organic matter (OM), iron (Fe), sulfide (S), and manganese (Mn), at the water-sediment boundary (WSB). However, the mechanistic path of these substances leading to black water remains unsettled. In this study, a 35-day field study was conducted using the thin-film diffusion gradient technology (DGT) and the planar optrode to address the unknown combined effects of Fe, Mn, OM, S, and tannins from Eucalyptus species on Tianbao reservoir.

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Article Synopsis
  • Sediment resuspension is crucial for nutrient release that promotes algal growth in large shallow lakes, particularly in Lake Taihu.
  • Researchers utilized advanced instruments like the acoustic Doppler velocimeter (ADV) and optical backscatter sensor (OBS) to measure sediment transport dynamics without interfering with natural conditions.
  • Key findings include a strong correlation between ADV echo intensity and suspended sediment concentration, an average settling velocity of 0.11 mm/s calculated through various methods, and a fitted power function to estimate settling velocity based on sediment concentration.
  • The study offers valuable insights for hydrodynamic modeling and enhances understanding of sediment transport and nutrient dynamics in lakes.
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