Progress in Studies in ICE Accumulation in River Bends

Jun, Wang; Chen, Pang-pang; Sui, Jueyi

doi:10.1016/s1001-6058(10)60171-0

Cited by 10 publications

(6 citation statements)

References 19 publications

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“…Overall the modelled depth, water/ice elevations, ice‐cover thicknesses and depth‐averaged velocities corresponded to the observations. Similar to the simulations of the present study, ice cover has earlier been observed to be thickest along the inner bank of the bends (Sui et al, ; Wang et al, ; Kämäri et al, ). The modelled ISEs and IWIEs were only 0.01–0.13 m lower than the observed values (cf.…”

Section: Discussionmentioning

confidence: 99%

Spatial variation of flow characteristics in a subarctic meandering river in ice‐covered and open‐channel conditions: A 2D hydrodynamic modelling approach

Lotsari

Tarsa

Kämäri

et al. 2019

Earth Surf Processes Landf

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To be able to understand year‐round river channel evolution both at present and in the future, the spatial variation of the flow characteristics and their sediment transport capabilities under ice cover need to be detected. As the measurements done through cross‐sectional drill holes cover only a small portion of the river channel area, the numerical simulations give insight into the wider spatial horizontal variation of the flow characteristics. Therefore, we simulate the ice‐covered flow with a hydrodynamic two‐dimensional (2D) model in a meandering subarctic river (Pulmanki River, Finland) in mid‐winter conditions and compare them to the pre‐winter open‐channel low flow situation. Based on the simulations, which are calibrated with reference measurements, we aim to detect (1) how ice‐covered mid‐winter flow characteristics vary spatially and (2) the erosion and sedimentation potential of the ice‐covered flow compared to open‐channel conditions. The 2D hydrodynamic model replicated the observed flow characteristics in both open‐channel and ice‐covered conditions. During both seasons, the greatest erosional forces locate in the shallow sections. The narrow, freely flowing channel area found in mid‐winter cause the main differences in the spatial flow variation between seasons. Despite the causes of the horizontal recirculating flow structures being similar in both seasons, the structures formed in different locations depended on whether the river was open or ice covered. The critical thresholds for particle entrainment are exceeded more often in open‐channel conditions than during ice‐covered flow. The results indicate spatially extensive sediment transport in open‐channel conditions, but that the spatial variability and differences in depositional and erosional locations increase in ice‐covered conditions. Asymmetrical bends and straight reaches erode throughout the year, whereas symmetrical, smaller bends mainly erode in open‐channel conditions and are prone to deposition in winter. The long ice‐covered season can greatly affect the annual morphology of the submerged channel. © 2019 John Wiley & Sons, Ltd.

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Section: Discussionmentioning

confidence: 99%

Spatial variation of flow characteristics in a subarctic meandering river in ice‐covered and open‐channel conditions: A 2D hydrodynamic modelling approach

Lotsari

Tarsa

Kämäri

et al. 2019

Earth Surf Processes Landf

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“…The bend is known as one of the common locations for the initiation ice jam affected by the flow characteristics and the channel curvature; the flow structure under the ice cover or jam is of more complexity influenced by many factors, e.g., boundary conditions and thermal regime [24]. The thickened ice cover is the basis of the accumulation of frazil slush and floes during freeze-up period, and the Froude number at the leading edge of the ice cover determines the position and thickness of the freeze-up jam [20].…”

Section: Ice Jam Formation In the Bendmentioning

confidence: 99%

Freeze-Up Ice Jam Formation in the River Bend, a Case Study on the Inner Mongolia Reach of Yellow River

et al. 2021

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Concern has been expressed regarding the impacts of climate change on river ice and ice jam formation in cold regions. Ice jams are easily initiated in bends and narrow channels and cause disasters. In this study, observations and remote sensing monitoring are used to study the freeze-up ice jam formation of bends. Sediment transport and freezing process of the river interact, influencing bed changes profile and sedimentary budget. River ice processes, channel evolution, ice hydro-thermodynamics, and ice jam accumulation are explored. The results show that the channel topography determines the river thalweg, and that the channel elevation interacts with the river ice through sediment transport. The channel shrinkage increases the probability of ice jam, and the sharp bend is prone to ice jam formation. Under the effect of secondary circulation flow in the bend and in the outer bank, the juxtaposed freeze-up and the hummocky ice cover occur in the same location, and frazil ice accumulates under the junction of the main channel and the shoals. Affected by the increase of the hydraulic slope and the velocity downstream, open water reaches develops downstream of the ice accumulation. An open water section is emerged upstream of the bend, due to the ice deposition, and partly cut-off supply of the frazil.

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“…1). Теоретические представления о заторах разработаны как отечественными [Лисер, 1967;Бузин, 2008;Земцов, Вершинин, Инишев, 2014;Кононова, 2014;Беркович и др., 2015], так и зарубежными авторами [Beltaos, Krishnappan, 1982;Bakony, 1988;Wang, Chen, 2011].…”

Section: постановка проблемыunclassified

Factors of formation of ice jams during floating of ice and their registration for the substantiation of the events for prevention of floodsat the area of Tom river Tomsk territory

Zamaraev¹

2017

Geosphere Research

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Актуальность работы обусловлена существенным антропогенным прессингом на русло и пойму р. Томь, который усугубил существующие угрозы катастрофических наводнений. Определены наиболее эффективные способы защиты населения, застроенных территорий и инфраструктуры поселений от угроз, обусловленных катастрофическими наводнениями на р. Томи у г. Томска. Произведен анализ процессов взаимодействия основного русла и речных пойм, их морфологических особенностей при наступлении катастрофических наводнений весеннего половодья р. Томи у г. Томска. В нижнем течении р. Томь выходит с гор на равнину, снижаются скорости течения, осаждаются наносы, река разбивается на рукава, появляются острова и многочисленные протоки, плесы и перекаты. Естественные деформации русла и поймы характеризуются двумя типами: русловая и пойменная многорукавность. Образовавшийся в основном русле затор льда, подобно плотине, вызывает подъем уровня воды, происходит выход воды на пойму. По мере подъема уровня на пойме возрастает альтернативный основному руслу поток паводковых вод. Пойменная и русловая многорукавность оказывается способной пропускать выходящие на пойму паводковые воды в обход образующимся заторам в основном русле. За многие тысячелетия на затороопасных участках сформировались пойменные протоки, отводившие воду с поймы в обход заторам. Они действуют подобно аварийным клапанам, сбрасывающим избыток воды. Борьба с наводнениями от заторов льда должна быть сведена к поддержанию в «действующем» состоянии проток, сбрасывающих паводковые воды, с одновременным обвалованием территорий, затопление которых недопустимо с хозяйственной и экологической точек зрения (жилые массивы, предприятия, коммуникации и др.). Ключевые слова: заторы льда, пойменная многорукавность, долина реки, пропускная способность русла, русловые процессы.

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Progress in Studies in ICE Accumulation in River Bends

Cited by 10 publications

References 19 publications

Spatial variation of flow characteristics in a subarctic meandering river in ice‐covered and open‐channel conditions: A 2D hydrodynamic modelling approach

Spatial variation of flow characteristics in a subarctic meandering river in ice‐covered and open‐channel conditions: A 2D hydrodynamic modelling approach

Freeze-Up Ice Jam Formation in the River Bend, a Case Study on the Inner Mongolia Reach of Yellow River

Factors of formation of ice jams during floating of ice and their registration for the substantiation of the events for prevention of floodsat the area of Tom river Tomsk territory

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