scholarly journals Improvement of the method of combined plans for the analysis of channel re-formations of a water body on the example of the oka river section

2021 ◽  
Vol 2131 (3) ◽  
pp. 032076
Author(s):  
M Matugin ◽  
D Miltsin ◽  
M Reshetnikov ◽  
A Mazgaleva
Keyword(s):  
Water Body ◽  
Vertical Channel ◽  
River Channel ◽  
Qualitative Assessment ◽  
Channel Processes ◽  
Channel Deformations ◽  
Channel Changes ◽  
River Bed ◽  
The Stability ◽  
Vertical Deformations

Abstract The article discusses the ways of improving the method of combined plans for a water body channel reformations analysis on the example of a section of the Oka River. The main disadvantages of the existing classical approach to the analysis of channel processes through the channel surveys separate isobaths’combination are highlighted. A new approach to combining digital models of the river bed relief obtained from the hydrographic surveys results is proposed. Two directions of surface comparison are shown for the subsequent analysis of channel processes. For a qualitative assessment of channel changes, it is proposed to construct a new surface of vertical deformations and visualize it in color gradation or using lines of equal vertical deformations. For a quantitative assessment of channel processes, the use of a cartogram of vertical channel deformations is considered, and the numerical parameters for assessing the stability of the river channel are introduced. For the considered section of the Oka river channel, the main indicators of channel processes were obtained and analyzed using the proposed updated method. Separately, the calculation of the most optimal grid size was performed when constructing a cartogram of vertical channel deformations.

scholarly journals METHODS OF IMPROVING THE EFFICIENCY OF MONITORING OF CHANNEL DEFORMATIONS OF MOUNTAIN RIVERS NEAR BUILT-IN SETTLEMENTS: ON THE EXAMPLE OF THE BUKTYRMA RIVER

2018 ◽  
Vol 44 (1) ◽  
pp. 28-35 ◽  
Author(s):  
Talgat TAUKENOV ◽  
Kulchikhan DZHANALEEVA ◽  
Zhuldyz YERZHANOVA
Keyword(s):  
Public Space ◽  
Morphological Characteristics ◽  
Control Measures ◽  
Mountain Rivers ◽  
Channel Processes ◽  
Channel Deformations ◽  
Geoinformation Systems ◽  
The Earth ◽  
River Bed ◽  
Scientific Justification

The results of research on the development of methods for increasing the efficiency of monitoring the channel deformations of mountain rivers using the methods of aerospace studies of the Earth and geoinformation systems are presented. Examples are given of estimating channel deformations, compiling morphological characteristics of the valley, floodplain and river bed, determining the scheme for the development of channel processes using public space imagery, scientific justification for erosion control measures.

scholarly journals Yakutsk Water Agglomeration at the Lena River – Channel Processes Problems: History, Current State, Prospect, and Possibilities of Control

2012 ◽  
pp. 44-56
Author(s):  
Keyword(s):  
Flow Line ◽  
River Channel ◽  
Main Trend ◽  
Channel Processes ◽  
Channel Deformations ◽  
Lena River ◽  
Current State ◽  
Valley Side ◽  
Predictive Assessment ◽  
The Right

The paper presents results of the analysis of the Lena River channel deformations near the Yakutsk City over the period exceeding the past 100 years. The data presented enables to conclude that the main trend of the channel development over that period has been a transformation of the adjoint braids pattern into the parallel arms pattern accompanied with directed migration of the main flow line towards the right valley side along the entire studied reach. Such a tendency of channel evolution creates an unfavorable situation for operations of the Yakutsk water industry and transportation facilities. The paper also gives a predictive assessment of the future channel deformations and proposes a set of channel regulation measures aimed at improving the situation.

scholarly journals Two-dimensional hydrodynamic modelling of channel processes and floods characteristics at the confluence of the Amur and Zeya rivers

2019 ◽  
Vol 381 ◽  
pp. 73-77
Author(s):  
Eugeniya Fingert ◽  
Inna Krylenko ◽  
Vitaly Belikov ◽  
Pavel Golovlyov ◽  
Aleksandr Zavadskii ◽  
...  
Keyword(s):  
Flow Characteristics ◽  
Main Channel ◽  
River Channel ◽  
Main Flow ◽  
Two Dimensional ◽  
Channel Processes ◽  
Amur River ◽  
Channel Changes ◽  
Side Channels ◽  
River Confluence

Abstract. Two-dimensional hydrodynamic STREAM_2D model have been applied to the confluence of Amur and Zeya rivers. Main flow characteristics and possible channel changes are considered during modeling for two scenarios – without dams near Big Heihe Island (1) and with four dams in the side channels around the island (2). Results of modeling demonstrate impact of dams construction on flow concentrating in the main channel, which can lead to increasing of flow velocities and subsequent erosion in main Amur River channel downstream the river confluence.

scholarly journals Pokrovsko-Yakutsky reach of the Lena River: transformation of complex conjugated channel, recent deformations and management of channel changes

2019 ◽  
pp. 83-96
Author(s):  
R. S. Chalov ◽  
A. S. Zavadsky ◽  
D. V. Botavin ◽  
P. P. Golovlev ◽  
E. A. Morozova ◽  
...  
Keyword(s):  
Sediment Accumulation ◽  
Emergency Situation ◽  
System Transformation ◽  
Channel Processes ◽  
Valley Bottom ◽  
Channel Deformations ◽  
Local Conditions ◽  
Channel Changes ◽  
Lena River ◽  
Near Shore

The article considers the conditions of conjugate branches system transformation into parallel-branched channel, which are the most complex morphologically (by the mode of deformations and management) on the example of the Pokrovsko-Yakutsky section of the middle Lena River basin in the 21st century. It may arise from the general increase in the Lena Rivers water content and thawing frozen soils (composing shallow waters and near-shore shallows), as well as from the development of sleeves with unstable channel. At the same time, local conditions encouraged to the formation of a complex single (three-arm) branching at the beginning of the expansion of the valley bottom and the channel below city of Pokrovsk, the preservation of a straight unbranched channel upstream, the channel of the same type below the Tabaga Cape and alternating one-side branching at the end of the site. The modern riverbed reformation after the changes occurred consists in the transgressive displacement of floodplain-island massifs, intensive banks erosion, and the sediment accumulation zones formation. This has led to the significant complications in the river water usage (including water intake and port water areas sedimentation, creation an unfavorable environment in the port approaches area, berths and industrial infrastructure) and to creation of an emergency situation at the coastal infrastructure facilities. The revealed channel deformations regularities on the basis of long-term and modern researches and hydrodynamic modeling allowed to develop and justify the complex scheme of channel processes management, which implementation will allow to reduce or neutralize their adverse or dangerous manifestations.

scholarly journals Adapting of bridges at mining area to the lowered bed of rivers

2019 ◽  
Vol 106 ◽  
pp. 01001
Author(s):  
Piotr Bętkowski
Keyword(s):  
Water Table ◽  
Urban Areas ◽  
Mining Area ◽  
River Channel ◽  
Technical Problems ◽  
Ground Pressure ◽  
River Bed ◽  
The Stability ◽  
Existing Bridges ◽  
Technical Solutions

This article describes technical problems concerning bridges, dangers that arise when the bottom of the river bed is lowered during the liquidation of the floodplains. These floodplains arise as a result of terrain subsidence caused by mining exploitation. In urban areas with developed building and road infrastructure, bayous can cause significant social and material damages. One of manners of the floodplain liquidation or long-lasting lowering the water table is lowering the bottom of river channel on the leakage from bayou. Lowering the river channel can concern the section of few kilometres even long. Lowering the riverbed by dredging or considerable deepening generally does not cause important problems. Significant technical problems are generated by bridge objects. In the case of bridges, it is necessary to ensure the stability of bridgeheads, protect foundations from washing away and undermining. It is necessary to design channel reinforcement so that significant horizontal forces do not occur due to removing the part of the soil-ground from the riverbed (lack of passive ground pressure). Several technical solutions of adapting existing bridges to the lowered river bed for different structures are described.

scholarly journals Analysis of Prognosis of Lowland River Bed Erosion Based on Geotechnical Parameters

2015 ◽  
Vol 37 (4) ◽  
pp. 57-63 ◽  
Author(s):  
Agnieszka Smaga
Keyword(s):  
Erosion Rate ◽  
Great Influence ◽  
River Channel ◽  
Natural Resistance ◽  
Erosion Process ◽  
In Situ Tests ◽  
Bed Erosion ◽  
River Bed ◽  
Random Location ◽  
The Stability

Abstract The river erosion is a complex process, the dynamics of which is very difficult to predict. Its intensity largely depends on hydraulic conditions of the river channel. However, it is also thought that natural resistance of the subsoil has a great influence on the scale of the erosion process. Predicting the effects of this process is extremely important in the case of constructing a piling structure (for example, artificial reservoirs). The partition of the river channel causes significant lowering of the river channel bed downstream the dam which threatens the stability of hydro technical and engineering (bridges) buildings. To stop this unwanted phenomenon, stabilizing thresholds are built. However, random location of thresholds significantly reduces their effectiveness. Therefore, taking under consideration natural geotechnical conditions of the subsoil appears to be extremely important. In the light of the current development of in-situ tests in geotechnics, an attempt to use results from these tests to predict the bed erosion rate was made. The analysis includes results from CPTU and DPL tests, which were carried out in the Warta River valley downstream the Jeziorsko reservoir. In the paper, the general diagrams for the procedure of obtaining and processing the data are shown. As a result, the author presents two multidimensional bed erosion rate models built based on hydraulic data and results from CPTU or DPL tests. These models allow taking more effective actions, leading to the neutralization of the effects of the intensive bed erosion process.

Application of the method of mathematical modeling for forecasting channel deformations at the underwater crossing of the main pipeline

2020 ◽  
Vol 10 (6) ◽  
pp. 599-609
Author(s):  
Valery А. Gruzdev ◽  
◽  
Georgy V. Mosolov ◽  
Ekaterina A. Sabayda ◽  
◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Roughness Coefficient ◽  
Computational Domain ◽  
Channel Deformations ◽  
Geological Surveys ◽  
Kuban River ◽  
The Stability ◽  
Protective Structures

In order to determine the possibility of using the method of mathematical modeling for making long-term forecasts of channel deformations of trunk line underwater crossing (TLUC) through water obstacles, a methodology for performing and analyzing the results of mathematical modeling of channel deformations in the TLUC zone across the Kuban River is considered. Within the framework of the work, the following tasks were solved: 1) the format and composition of the initial data necessary for mathematical modeling were determined; 2) the procedure for assigning the boundaries of the computational domain of the model was considered, the computational domain was broken down into the computational grid, the zoning of the computational domain was performed by the value of the roughness coefficient; 3) the analysis of the results of modeling the water flow was carried out without taking the bottom deformations into account, as well as modeling the bottom deformations, the specifics of the verification and calibration calculations were determined to build a reliable mathematical model; 4) considered the possibility of using the method of mathematical modeling to check the stability of the bottom in the area of TLUC in the presence of man-made dumping or protective structure. It has been established that modeling the flow hydraulics and structure of currents, making short-term forecasts of local high-altitude reshaping of the bottom, determining the tendencies of erosion and accumulation of sediments upstream and downstream of protective structures are applicable for predicting channel deformations in the zone of the TLUC. In all these cases, it is mandatory to have materials from engineering-hydro-meteorological and engineering-geological surveys in an amount sufficient to compile a reliable mathematical model.

scholarly journals The conditions for occurrence of critical flow regime of water in the open stream

2019 ◽  
Vol 97 ◽  
pp. 05006
Author(s):  
Yuliya Bryanskaya ◽  
Aleksandra Ostiakova
Keyword(s):  
Froude Number ◽  
Flow Regime ◽  
Water Flow ◽  
Practical Interest ◽  
Open Water ◽  
Critical Regime ◽  
Critical Flow ◽  
Channel Processes ◽  
Channel Deformations ◽  
Critical Flow Regime

For the solution of engineering problems require increasingly accurate estimates of the hydraulic characteristics of the water streams. To date, it is impossible to consider sufficiently complete theoretical and experimental justification of the main provisions of the theory of turbulence, hydraulic resistance, channel processes. The composition of tasks related to flows in wide channels, turbulence problems are of scientific and practical interest. Various interpretations of the determination of the critical Froude number in wide open water flows based on observations and theoretical transformations are considered. The conditions for the emergence of a critical regime of water flow in an open wide channel are analyzed in order to estimate the critical Froude number and critical depth. Estimates of the critical Froude number for laboratory and field conditions are given. The estimations allow us to consider the proposed approach acceptable for determining the conditions of occurrence of the critical flow regime. The General, physical interpretation of conditions of occurrence of the critical regime of water flow on the basis of phenomenological approach is specified. The results take into account the values of the components of the total specific energy of the section. This shows the estimated calculation. The results obtained theoretically make it possible to compare the above interpretations and determine their applicability, and the results of the analysis can be useful for the estimated calculations of flows in channels and river flows in rigid, undeformable boundaries and with minor channel deformations.

Hohokam Political Ecology and Vulnerability: Comments on Waters and Ravesloot

2003 ◽  
Vol 68 (1) ◽  
pp. 169-181 ◽  
Author(s):  
Bradley E. Ensor ◽  
Marisa O. Ensor ◽  
Gregory W. De Vries
Keyword(s):  
Political Ecology ◽  
Social Groups ◽  
River Channel ◽  
Cultural Changes ◽  
Anthropological Perspective ◽  
Channel Change ◽  
Channel Changes ◽  
Environmental Processes ◽  
River Channel Change

Waters and Ravesloot (2001) test the assumption that natural river channel change caused periods of Hohokam cultural reorganization. However, they conclude that channel changes did not correlate with all periods and areas of significant cultural changes and that landscape alone cannot explain Hohokam transformations. An anthropological perspective on political ecology and disasters can explain why environmental processes and events differentially impact societies, differentially impact societies diachronically and differentially impact social groups within societies. We suggest that this perspective may explain the variability described by Waters and Ravesloot.

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