Parameterization of channel processes for their forecast estimation and diagnostics of hazardous manifestations

2017 ◽  
Vol 44 (5) ◽  
pp. 738-748
Author(s):  
R. S. Chalov
Keyword(s):  
Channel Processes

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.

Retention and Transport of Nutrients in a Third-Order Stream: Channel Processes

Ecology ◽  
1989 ◽  
Vol 70 (6) ◽  
pp. 1877-1892 ◽  
Author(s):  
Frank J. Triska ◽  
Vance C. Kennedy ◽  
Ronald J. Avanzino ◽  
Gary W. Zellweger ◽  
Kenneth E. Bencala
Keyword(s):  
Stream Channel ◽  
Channel Processes ◽  
Third Order ◽  
Order Stream

The Water Transferred of Meandering River in Cellular Model

2012 ◽  
Vol 452-453 ◽  
pp. 842-845
Author(s):  
Min Zhang ◽  
Rui Xun Lai
Keyword(s):  
Flow Direction ◽  
Field Measurements ◽  
Treatment Method ◽  
Special Treatment ◽  
Cellular Model ◽  
Channel Processes ◽  
Flow Routing ◽  
The Real ◽  
Meandering River ◽  
Routing Scheme

We have known that many of the main features of river can be captured in a relatively simple cellular computer model. Here we examine some of the detailed characteristics of this model. We show a new tangential angle and special treatment method in curvature channel in a simple cellular model. The water distribute will be determined by the tangential angle which represent the flow direction. And the same tangential angle cellular in curvature reach will be transport in one group in filially. The results show it can make the flow routing conformed to the real river, and solve the question of curve bending coefficient is too large. The results of the routing scheme are compared with field measurements of cross-section, with the predictions of a more close to the real. It’s indicate that the curvature flow routing scheme outlined here is able to overcome some of the limitations of previous simple cellular automata models and may be suitable for use in curvature reach of river modeling water and sediment transport and channel change in complex fluvial environments. As such this research represents a small and ongoing contribution to the field of numerical simulation of curvature channel processes.

scholarly journals Geopolitical Aspects of Channel Processes

2011 ◽  
Author(s):  
Keyword(s):  
Negative Impact ◽  
Eastern Region ◽  
Channel Processes ◽  
Republic Of China ◽  
River Bed ◽  
Boundary Position ◽  
State Boundary ◽  
Far Eastern ◽  
Water Work

When using the Far-Eastern Region as a study case the paper deals with the issues of political tensions between neighboring states (Russia and People’s Republic of China) caused by coinciding of state boundaries with rivers. Main forms of negative impact of channel processes that cause reconsideration (demarcation) of the boundary position have been described. The role of water work facilities that influence the river bed regime transformation and, consequently, fairway/state boundary position alteration is being assessed.

A Theory of Channel Control

1973 ◽  
Vol 37 (1) ◽  
pp. 39-47 ◽  
Author(s):  
Louis P. Bucklin
Keyword(s):  
Control Process ◽  
Channel Processes ◽  
Competitive Position ◽  
Channel Control ◽  
Insight Into

The degree of coordination among activity stations in a channel is a measure of the competitive position of that system. The author discusses problems of channel control. He presents a model of the control process that should provide new insight into channel processes and a basis for improved strategies for attaining desired levels of coordination.

scholarly journals Channel processes of a small river heavily modified by human activities

2020 ◽  
Vol 163 ◽  
pp. 06011
Author(s):  
Aleksandr Varenov ◽  
Anna Tarbeeva ◽  
Dmitriy Botavin ◽  
Nadezhda Mikhaylova ◽  
Leonid Turykin ◽  
...  
Keyword(s):  
Human Impact ◽  
Water Discharge ◽  
High Sensitivity ◽  
Bank Erosion ◽  
Small Rivers ◽  
Channel Processes ◽  
Channel Changes ◽  
Volga Upland ◽  
Local Residents ◽  
Special Approach

Widely-spread small rivers are very poorly studied in relation to channel processes. The influence of local factors, high sensitivity to human impact, close connection with basin processes, and relatively low rates of channel changes distinguish them from medium and large ones and make it necessary to form a special approach to studies. Based on collection of long-term maps and local residents’ interviews, we reconstructed the transformation of channels in the Kudma River basin (the Volga Upland) for the last 200 years. Based on the bank erosion monitoring during 2011-2019 the modern rates of channel changes were revealed. We found that significant human impact is associated with the artificial channels cutoffs and draining of ponds which led to channel incision of the Kudma and Ozerka Rivers in the middle reaches and the transformation of floodplain into terrace. Agriculture development caused siltation of the upper reaches of rivers. The rivers of the forested part of the basin experienced the least human changes. From 2011 to 2019 the maximum rates of bank erosion were found to be within range of 0.3 to 2.7 m/year and supposed to be driven by peak water discharge.

scholarly journals Model analyses of the contribution of in-channel processes to sediment concentration hysteresis loops

2015 ◽  
Vol 527 ◽  
pp. 576-589 ◽  
Author(s):  
Jan Pietroń ◽  
Jerker Jarsjö ◽  
Anna O. Romanchenko ◽  
Sergey R. Chalov
Keyword(s):  
Hysteresis Loops ◽  
Sediment Concentration ◽  
Channel Processes
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