The structure of ice and ice cover in lower Amur reaches with branched channel

Махинов, А. Н.; Kim, V. I.; Shmigirilov, S. A.

doi:10.1134/s0097807817040108

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…The inclusions lower layers (layers of core 52-70 and 70-117 cm) are the thinnest in size. Formation irregularly shaped loam accumulations in these layers associated with winter dumping of water from the reservoirs of large hydropower plants in the Sungari, Zeya and Bureya rivers network, which leads to an increase in water velocity and turbidity (Makhinov, Kim 2013, Makhinov et al, 2017. Differential curves (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…At the last stage of freezeup formation in the river hummocks are formed, whose number and height (up to 1.5 m) on mainstream are the maximum. Near the shores the ice surface is usually smooth (Makhinov, 2013(Makhinov, , 2017. According to the thickness and stratigraphy the ice in the main channel is divided into the following types: strong, moderate, weak, flat hummocky and flat ice (naled ice in this work is not considered).…”

Section: Study Areamentioning

confidence: 99%

“…Such significant changes in hydrological and hydrochemical regimes could not affect the composition of the Amur River ice, work on the study of which began relatively recently (Ivanov et al, 1987;Shesterkin, 1990;Makhinov, 2013Makhinov, , 2017. It was found that the ice cover is characterized by a significant amount of terrigenous material.…”

Section: Introductionmentioning

confidence: 99%

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Composition of the Middle Amur Ice Cores after Catastrophic Flooding in 2013

2017

Biogeosystem Technique

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Content and composition of ice inclusions are the important characteristics of the redistribution of substance in river ecosystems, which allows taking into account transport of the inclusions matter during the spring ice drift. The data on the composition of the ice cores from the Middle Amur (Khabarovsk water node) after the extreme flooding in 2013 and its terrigenous, chemogenic (formed through chemical processes) and biogenic (diatoms) components are presented in this paper. The importance of the work lies in the fact that the impact on the river ecosystems of catastrophic floods, such as the 2013 flood on the Amur River, due to their uniqueness, has been extremely poorly studied. The analysis showed that the content of terrigenous material and its variation in ice thickness does not exceed the average multi-annual values. The particle-size distribution of the terrigenous material (on their volume and the number) corresponds to that of the river suspended matter, warps (silt deposits on the flood plain) and bottom sediments in the studied river area. Composition of diagnosed chemical inclusions (neoformations of calcite CaCO3 and pyrite FeS2), their number and size depends on the chemical composition of water during the freeze-up and redox conditions in the layer. Flooding had the main impact on biogenic inclusions (diatoms). The change of the leading species (from single population Aulacoseira islandica to Stephanodiscus hantzschii Coscinodiscophyceae class, Stephanodiscaceae family, genus Stephanodiscus) was fixed. This is one of the main indicators of structural and functional violations orderliness hydrobionts. The change in the composition of the leading species associated with the arrival of eutrophying substances and pollutants from the Sungari River (the largest tributary of Amur River) as a result of outcome flooding agricultural lands and residential territories.

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Section: Resultsmentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Composition of the Middle Amur Ice Cores after Catastrophic Flooding in 2013

2017

Biogeosystem Technique

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Bioindication of mercury pollution of the Amur River during the ice-covered period

Andreeva

2021

IOP Conf. Ser.: Earth Environ. Sci.

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The results of the layer-by-layer research of a river ice cores by using spectral and microbiological methods were presented. The impact of the mercury on sulfate-reducing bacteria activity from different layers of ice that had been sampled in March 2016 in the lower Amur River in Khabarovsk city was found. It was found that mercury concentration range of 0.0005-0.001 mg/l stimulated the sulfate-reducing bacteria activity, which were into the ice throughout the study area of the Amur River. To a large extent, this effect was typical for the ice that was sampled in the right bank of the Amur River near Khabarovsk city, where mercury pollution of the aquatic environment had been detected repeatedly. The activity of biogeochemical processes into the ice determined by high concentrations of organic substances, by the pollution of the aquatic environment with mercury during the ice cover formation, and by the abundance of cultivated heterotrophic and sulfate-reducing bacteria. During the ice drift and ice melting, the secondary pollution with toxic substances of various genesis of the aquatic environment occurs, which can have a negative impact on a hydrobionts.

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Assessment of the Impact of Climate Change on the Hydrological Regime of the Amur River in the Lower Reaches

Махинов

Махинова

2022

Geogr. Nat. Resour.

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The structure of ice and ice cover in lower Amur reaches with branched channel

Cited by 3 publications

References 3 publications

Composition of the Middle Amur Ice Cores after Catastrophic Flooding in 2013

Composition of the Middle Amur Ice Cores after Catastrophic Flooding in 2013

Bioindication of mercury pollution of the Amur River during the ice-covered period

Assessment of the Impact of Climate Change on the Hydrological Regime of the Amur River in the Lower Reaches

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