The Influence of Thermal Erosion at River Bed Deformation in Permafrost Areas

2021 ◽  
Author(s):  
Elena Debolskaya ◽  
Vladimir Debolskiy ◽  
Oksana Maslikova ◽  
Ilya Gritsuk ◽  
Alexander Ivanov
Keyword(s):  
Thermal Erosion ◽  
Bed Deformation ◽  
River Bed

River bed deformation calculated from boundary shear stress

2002 ◽  
Vol 40 (5) ◽  
pp. 603-609 ◽  
Author(s):  
Andre Paquier ◽  
Saeed R. Khodashenas
Keyword(s):  
Shear Stress ◽  
Bed Deformation ◽  
Boundary Shear ◽  
River Bed ◽  
Boundary Shear Stress

scholarly journals Modeling of river bed deformation composed of frozen sediments with increasing environmental temperature

2015 ◽  
Vol 121 (1) ◽  
pp. 104 ◽  
Author(s):  
E. I. Debolskaya ◽  
V. K. Debolsky ◽  
I. I. Grtsuk ◽  
O. YA. Maslikova ◽  
D. N. Ionov
Keyword(s):  
Environmental Temperature ◽  
Bed Deformation ◽  
River Bed

Dynamics of river bed processes of the Ural River in Western Kazakhstan

2014 ◽  
Vol 9 (4) ◽  
pp. 457-463
Author(s):  
N. Kh. Sergaliev ◽  
K. M. Akhmedenov
Keyword(s):  
Horizontal Displacement ◽  
Channel Processes ◽  
Erosion Risk ◽  
Related Data ◽  
Bed Deformation ◽  
River Bed ◽  
Main River ◽  
Medium Level ◽  
West Kazakhstan ◽  
First Time

A retrospective analysis of river bed deformation over a 34-year period has been carried out for the first time for the Ural River in West Kazakhstan, in different environmental conditions. Horizontal shifts of the Ural riverbed have been defined according to space shots made in 2012. Erosion risk, as a result of horizontal displacement of the river bed has been determined in West Kazakhstan. A geomorphologic description of the Ural River bed and floodplain, and the dynamics of channel processes in the river within West Kazakhstan are given. The probable pattern of channel realignments for the Ural River has been determined. The paper describes the results of map compilation and related data consolidation with respect to the horizontal river bed shifts in West Kazakhstan, and includes a review of characteristics of the hydrologic and hydrochemical regimes of the river. The main river bed types, which are typical of flat terrain, are also discussed. West Kazakhstan is a region where there is medium-level ecologic stress on the river beds and floodplains.

Research on Simulation Technique of Shoal Protection Works in Middle and Lower Reaches of Yangtze River

2014 ◽  
Vol 501-504 ◽  
pp. 1956-1962
Author(s):  
Xiao Fei Liu
Keyword(s):  
Yangtze River ◽  
Physical Simulation ◽  
Simulation Technique ◽  
Application Time ◽  
Protection Effect ◽  
Bed Deformation ◽  
Channel Regulation ◽  
River Bed ◽  
Improvement Measure ◽  
Geometry Similarity

The shoal protection works in the middle and lower Yangtze River is divided three types, i.e. riprap in bulk, dam body and soft mattress. As a new kind of shoal protection works, because the application time is very short, therefore the beach protection effect and the improvement measure have not thorough researched. In order to better apply to channel regulation project, the simulation technique of the X-type flexible mattress is thorough researched, the aspects of geometry similarity, gravity similarity, plan layout similarity and river bed deformation similarity are solved, the physical simulation technology problem is realized.

scholarly journals A model of river bank deformations under the simultaneous effect of waves from a hydropower plant and warming

2014 ◽  
Vol 364 ◽  
pp. 32-37 ◽  
Author(s):  
E. Debolskaya
Keyword(s):  
Laboratory Data ◽  
Hydropower Plant ◽  
Alluvial Channels ◽  
River Bank ◽  
Water Ice ◽  
Bed Deformation ◽  
River Bed ◽  
Sediment Mass ◽  
Model Predictions ◽  
Good Agreement

Abstract. This paper presents a mathematical model of the river bed deformations in permafrost areas. The deformations are caused by the influence of waves of various origins under an increase of the ambient temperature. The model system consists of an unsteady hydrodynamic module, a thermal module and a bed deformation module. The hydrodynamic module is based on the two-dimensional shallow water equations. The bed deformation module is based on the sediment mass balance conditions. The thermal module is based on the Stefan equation, which defines the "water–ice" boundary movement. We present two applications of the model in which the bed deformation is calculated for the alluvial channels with melting bed under the influences of waves of different duration and intensity. We compared the model predictions with the laboratory data, generally obtaining a good agreement between the two.

scholarly journals Case Study: Forecasting the Lower Vistula Bed Deformation without and with Development of Dam Cascade

Water ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2142
Author(s):  
Janusz Kubrak ◽  
Adam Kiczko ◽  
Elżbieta Kubrak
Keyword(s):  
Flow Model ◽  
One Dimensional ◽  
Bed Deformation ◽  
Dimensional Flow ◽  
Vistula River ◽  
River Transport ◽  
River Bed

The case study presents the results of numeric simulations of deformations of Vistula River bed downstream the Włocławek Dam, with and without development of the downstream dam cascade. Calculations were performed using a one-dimensional flow model MIKE11 with a river transport module. Using synthetic inflow hydrographs, predictions were performed for 39 year period (2016–2055). Results indicate that the construction of the dam cascade will reduce the erosion of the river bed downstream the Włocławek dam.

Distribution of nitrifying bacteria in a shallow stream

1997 ◽  
Vol 36 (8-9) ◽  
pp. 161-166 ◽  
Author(s):  
Ivana Jancarkova ◽  
Tove A. Larsen ◽  
Willi Gujer
Keyword(s):  
Field Experiments ◽  
Heterotrophic Bacteria ◽  
Pollution Source ◽  
Nitrifying Bacteria ◽  
Channel Water ◽  
River Bed ◽  
Hydraulic Conditions ◽  
Major Floods ◽  
Shallow Stream ◽  
Stream Bed

A project investigating the dynamics of self-purification processes in a shallow stream is carried out. Effects of the concentration gradient due to the distance to the pollution source, of hydraulic conditions in the river bed and of storm floods on the distribution of nitrifying bacteria were studied with the help of laboratory and field experiments. Nitrifiers density on the surface of the stream bed increased rapidly up to a distance of 300 m from the WWTP indicating possible competition of the nitrifiers with the heterotrophic bacteria close to the WWTP. Afterwards a slight decrease in the downstream direction was observed. In vertical profiles, higher bacterial densities were found at sites with rapid infiltration of channel water to the stream bed than at sites with no exchange between channel water and stream bed water or where stream bed water exfiltrated. A major flood event scoured the nitrifiers nearly totally from the surface of the river bed. Major floods belong so to the most dominant processes controlling self-purification in shallow streams. Minor floods, however, don't scour bacteria in the depth of the stream bed that could then be important for the self-purification processes.

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