Specific features of ice regime in rivers of the Northern Dvina basin

Агафонова, С. А.; Frolova, Natalia

doi:10.1134/s0097807807020029

Cited by 19 publications

(12 citation statements)

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“…Although the date of ice appearance and the intensity of ice-drifting are determined mainly by the temperature under natural conditions, morphological factors and anthropogenic effects play an important role in the date of ice cover formation (Agafonova and Frolova 2007). Reservoir usage changes the river ice regime, because the morphological conditions of the river are altered by dams and other engineering structures.…”

Section: Discussionmentioning

confidence: 99%

“…An increasing number of studies have showed significant trends for later freeze-up and earlier break-up occurrence, and annual number of ice freezing days decrease (Loader et al 2011;Hodgkins et al 2005;Prowse and Beltaos 2002). Some records show that, for the twentieth century, freeze-up dates occur on average 2-25 days later, break-up dates 2-24 days earlier, and the ice freezing period also has decreased by an average of 2-38 days over the past 100 years in the Northern Hemisphere (Agafonova and Frolova 2007;Jiang et al 2008;Klavins et al 2009). Also, many nonclimatic factors could also influence the occurrence of different river ice phenomena, including bed morphology or human activity (Starosolszky 1990;Radoane et al 2010;Agafonova and Frolova 2007), which could exaggerate or hide natural trends in the river ice regime if they operate in either the same or opposite direction as the natural forces.…”

Section: Introductionmentioning

confidence: 94%

“…Some records show that, for the twentieth century, freeze-up dates occur on average 2-25 days later, break-up dates 2-24 days earlier, and the ice freezing period also has decreased by an average of 2-38 days over the past 100 years in the Northern Hemisphere (Agafonova and Frolova 2007;Jiang et al 2008;Klavins et al 2009). Also, many nonclimatic factors could also influence the occurrence of different river ice phenomena, including bed morphology or human activity (Starosolszky 1990;Radoane et al 2010;Agafonova and Frolova 2007), which could exaggerate or hide natural trends in the river ice regime if they operate in either the same or opposite direction as the natural forces. Therefore, understanding the new ice regime characteristics impacted by environmental change is very important for avoiding ice flood disaster.…”

Section: Introductionmentioning

confidence: 97%

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Ice regime variation impacted by reservoir operation in the Ning-Meng reach of the Yellow River

Chang

Wang

et al. 2015

Nat Hazards

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The Ning-Meng reach of the Yellow River in China is located in a high-latitude area, and river freezes up and breaks up every year, leading to ice flood and disaster. Since the 1990s, due to the rising winter temperatures, river channel shrinkage and impacts of reservoir operation, the river ice regime of the Ning-Meng reach has changed. This paper investigated reservoir operation effect on river ice regime by eliminating the impact of climatic conditions, and the test method could be applied to other rivers, where similar anthropogenic impacts can be suspected to affect the river ice regime. The results show that compared to the statistics when there were no reservoirs, the duration of ice freezing days reduced 8-33 days, and the ice cover thickness was 16-25 cm thinner than that without reservoirs. The average number of ice flood incidents per year decreased from 11.61 to 3.25, and the number of disasters reduced from 1.69 to 1.41. Moreover, the changes induced by reservoirs joint operation may vastly exceed that by single reservoir operation. The smaller is the distance to the upstream reservoir, the more obvious is the impact from the reservoir.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 97%

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Ice regime variation impacted by reservoir operation in the Ning-Meng reach of the Yellow River

Chang

Wang

et al. 2015

Nat Hazards

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“…Research has shown that, in the case of rivers in the Northern Hemisphere, we may observe a seasonal distribution of water temperature, while exceptions to this rule may be the result of weather anomalies or of the impact of anthropogenic factors [2,4,12,19]. High correlations between annual and monthly air and river water temperature values have been demonstrated for various regions, among others in the United States and Canada [16,[20][21][22][23][24], in Asia and Eurasia [25][26][27][28], and in Europe [29][30][31][32][33][34][35][36]. Studies concerning the thermal regime of Polish rivers have also confirmed the existence of significant relations and the impact of air temperature on the variability of river water temperature [4,5,13,[37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Relationship between Water Temperature of Polish Rivers and Large-Scale Atmospheric Circulation

Graf

Wrzesiński

2019

Water

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The objective of the paper consisted in determining the effect of macroscale types of NAO, AO, EA, EAWR, SCAND, and AMO atmospheric circulation on changes in water temperature in Polish rivers. The study has made use of a broad body of hydrometeorological materials covering daily water temperature values for 96 water gauge stations located on 53 rivers and air temperature values for 43 meteorological stations. Percentage shares of positive and negative coefficients of correlation of annual, seasonal, and monthly circulation type indices with air and river water temperature were determined, demonstrating the character of teleconnection. Determinations were made of water temperature deviations in positive and negative phases of the analyzed indices from average values from the years 1971–2015, and their statistical significance ascertained. Research has shown that relations between the temperature of river waters in Poland and macroscale circulation types are not strong, however they are noticeable, sometimes even statistically significant, and both temporally and spatially diverse. NAO, AO, EA, and AMO indices are characterized by a generally positive correlation with temperature, whereas SCAND and EWAR indices are characterized by a negative correlation. Research showed a varying impact of types of atmospheric circulation, with their effectiveness increasing in the winter season. The strongest impact on temperature was observed for the positive and negative NAO and AO phases, when deviations of water temperature from average values are correspondingly higher (up to 1.0 °C) and lower (by a maximum of 1.5 °C), and also for the positive and negative SCAND phases, when water temperature are correspondingly lower (by a maximum of 0.8 °C) and higher (by 1.2 °C) than average values. The strongest impact on water temperature in summer, mainly in July, was observed for AMO. The results point to the complexity of processes determining the thermal regime of rivers and to the possibility of additional factors—both regional and local—exerting an influence on their temporal and spatial variability.

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“…The simulation results demonstrated how hydropower regulation altered the thermal and ice regimes (Timalsina et al, 2013). Thus, although the date of ice appearance and the intensity of ice-drifting are determined mainly by the temperature under natural conditions, anthropogenic effects, including reservoir operation, play an important role in the process of ice-cover formation (Agafonova and Frolova, 2007).…”

Section: Introductionmentioning

confidence: 98%

Optimized cascade reservoir operation considering ice flood control and power generation

Chang

Wang

et al. 2014

Journal of Hydrology

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Specific features of ice regime in rivers of the Northern Dvina basin

Cited by 19 publications

References 0 publications

Ice regime variation impacted by reservoir operation in the Ning-Meng reach of the Yellow River

Ice regime variation impacted by reservoir operation in the Ning-Meng reach of the Yellow River

Relationship between Water Temperature of Polish Rivers and Large-Scale Atmospheric Circulation

Optimized cascade reservoir operation considering ice flood control and power generation

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