Effect of pore water of fine sediments on the ecological conditions of hydrosphere under oil-and-gas technogenesis conditions

Абукова, Л. А.; Абрамова, О. П.

doi:10.1134/s0097807816040023

Cited by 1 publication

(1 citation statement)

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“…In aquatic bodies, element geochemical cycles can be better understood through studies of the chemical composition of pore water that fills spaces between solid particles of bottom sediments 5 , 6 . Elemental composition of the pore water trapped in sediments can be used to study the conditions of matter circulation and its exchange between the bottom sediments and overlying water 7 , 8 . Pore water chemistry has proved to be a sensitive indicator of diagenetic transformations of bottom sediments, even when changes in their chemical characteristics may not be noticeable 9 .…”

Section: Introductionmentioning

confidence: 99%

Hydrochemistry of sediment pore water in the Bratsk reservoir (Baikal region, Russia)

Poletaeva

Tirskikh

Pastukhov

2021

Sci Rep

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This study aimed to identify the factors responsible for the major ion composition of pore water from the bottom sediments of the Bratsk water reservoir, which is part of the largest freshwater Baikal-Angara water system. In the Bratsk reservoir, the overlying water was characterized as HCO3–Ca–Mg type with the mineralization ranging between 101.2 and 127.7 mg L−1 and pore water was characterized as HCO3–SO4–Ca, SO4–Cl–Ca–Mg and mixed water types, which had mineralization varying from 165.9 to 4608.1 mg L−1. The ionic composition of pore waters varied both along the sediment depth profile and across the water area. In pore water, the difference between the highest and lowest values was remarkably large: 5.1 times for K+, 13 times for Mg2+, 16 times for HCO3−, 20 times for Ca2+, 23 times for Na+, 80 times for SO42−, 105 times for Cl−. Such variability at different sites of the reservoir was due to the interrelation between major ion concentrations in the pore water and environmental parameters. The major factor responsible for pore water chemistry was the dissolution of sediment-forming material coming from various geochemical provinces. In the south part of the reservoir, Cl−, Na+ and SO42− concentrations may significantly increase in pore water due to the effect of subaqueous flow of highly mineralized groundwater.

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