Impact of large water level fluctuations on geomorphological processes and their interactions in the shore zone of a dam reservoir

Kaczmarek, Halina; Mazaeva, Oksana; Козырева, Е. А.; Babicheva, Viktoria A.; Tyszkowski, Sebastian; Rybchenko, A. A.; Brykała, Dariusz; Bartczak, Arkadiusz; Słowiński, Michael

doi:10.1016/j.jglr.2016.07.024

Cited by 23 publications

(9 citation statements)

References 18 publications

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“…Accumulation of bottom sediments at Z-1 and Z-2 locations was greatly influenced by the sulfate karst formation, in which displacements occurred along the clay interlayer formed at the contact between gypsum-anhydrite rocks and layers of limestones and gypsum-bearing dolomites 37 . The karst processes are particularly intense in Osa Bay 38 . In the Bratsk reservoir, the intense karst-landslide deformations under water level changes 12 are one of main factors triggering the accumulation of terrigenous sulfate formation in bottom sediments.…”

Section: Discussionmentioning

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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Section: Discussionmentioning

confidence: 99%

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

Poletaeva

Tirskikh

Pastukhov

2021

Sci Rep

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“…From a worldwide perspective, most reservoir-induced landslides show an evolutionary characteristic of severe deformation at initialization and later stability [47][48][49][50]. The correlation between the fluctuation of the water level and the frequency of reactivated landslides is shown in Figure 15.…”

Section: Self-adjustment Of Deformationmentioning

confidence: 99%

Centrifuge Modeling and the Analysis of Ancient Landslides Subjected to Reservoir Water Level Fluctuation

Tang

et al. 2020

Sustainability

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Landslides are among the most severe natural hazards with significant impacts in human life and infrastructure. The Three Gorges Reservoir Area (TGRA) is vulnerable to landslides because of the geological environment and human activities. A centrifuge model test of a landslide with a planar sliding surface in the TGRA was conducted. Based on the multiple monitoring systems composed of a 3D laser scanner, pore water pressure transducers, particle image velocimetry and earth pressure sensors, multiphysical data were obtained. The work described here had the objective of researching the long-term deformation pattern of this kind of landslide that was subjected to periodic fluctuations in the reservoir water level. The results indicated that the failure processes were characterized by progressive retrogression and cracks caused by the reservoir drawdown. Transverse tensile cracks first appeared in the submerged zone of the slope. The front part of the slope was dominated by horizontal displacement, while the consolidation and compaction deformation in the vertical direction dominated at the mid-rear part of the slope. When the water level dropped again, the front part slid down and fell into the river, but the mid-rear part had no obvious deformation and exhibited a phenomenon of self-stabilization. Moreover, the phreatic line is a concave shape directed into the slope during reservoir filling and converts to a convex shape pointing out of the slope during reservoir drawdown. The earth pressures in the slope vary with the failure process of the landslide. Good agreement is obtained for the deformation characteristics between the experimental results and those of prototype landslides.

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“…Accumulation of bottom sediments at Z-1 and Z-2 locations was greatly in uenced by the sulfate karst formation, in which displacements occurred along the clay interlayer formed at the contact between gypsum-anhydrite rocks and layers of limestones and gypsum-bearing dolomites [39]. The karst processes are particularly intense in the Osa bay [40]. In the Bratsk reservoir, the intense karst-landslide deformations under water level changes is one of main factors triggering the accumulation of the terrigenous sulfate formation in bottom sediments.…”

Section: Sediments Of Reservoirmentioning

confidence: 99%

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

Poletaeva

Tirskikh

Pastukhov

2020

Preprint

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This study was aimed at identifying the processes responsible for the major ion composition of pore water from the bottom sediments of the Bratsk water reservoir, which is a part of the largest freshwater Baikal-Angara water system. The pore water ionic composition varies both along the sediment depth profile and across the water area. In pore water, the difference between the highest and lowest values is 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 a variability suggests that the dominant factors, influencing pore water chemistry, depend on the location. At the first stages of the sedimentation process, the chemistry of the pore water in the Bratsk reservoir is dependent on HCO3-Ca of the overlying water. Later on, due to the interaction with the sedimentary terrigenous material, they changed to SO4, SO4-HCO3, HCO3-SO4, HCO3-Cl-SO4-water types with exchangeable cations, mainly Ca. Some of pore waters may have a complex genesis associated with subaqueous groundwater discharge. The change in the redox potential observed in the pore water is the indicator of early-diagenetic transformations taking place in bottom sediments.

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Impact of large water level fluctuations on geomorphological processes and their interactions in the shore zone of a dam reservoir

Cited by 23 publications

References 18 publications

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

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

Centrifuge Modeling and the Analysis of Ancient Landslides Subjected to Reservoir Water Level Fluctuation

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

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