scholarly journals Improvement of Flow and Bed Topography by Making the Outer Bank Slope Milder in a Curved Channel

1992 ◽  
Vol 36 ◽  
pp. 55-60
Author(s):  
Shoji FUKUOKA ◽  
Takeshi SANNOMIYA ◽  
Tatsuya NISHIMURA
Keyword(s):  
Curved Channel ◽  
Bed Topography ◽  
Bank Slope ◽  
Outer Bank

Numerical study of flow pattern around lateral intake in a curved channel

2019 ◽  
Vol 30 (11) ◽  
pp. 1950083 ◽  
Author(s):  
Hossien Montaseri ◽  
Hossein Asiaei ◽  
Abdolhossein Baghlani ◽  
Pourya Omidvar
Keyword(s):  
Experimental Data ◽  
Numerical Model ◽  
Flow Pattern ◽  
Numerical Study ◽  
Numerical Models ◽  
Three Dimensional ◽  
Curved Channel ◽  
Channel Bend ◽  
Outer Bank ◽  
Center Region

This paper deals with numerical study of flow field in a channel bend in presence of a lateral intake using three-dimensional numerical model SSIIM2. The effects of bend on the structure of the flow around the intake are investigated and compared with the experimental data. The tests are carried out in a U-shaped channel bend with a lateral intake. The intake is located at the outer bank of an 180∘ bend at position 115∘ with 45∘ diversion angle and the experimental data can be used to calibrate and validate numerical models. The results show that both the center-region and outer-bank cross-stream circulations are observed in the experiments while only the former is captured by the numerical model due to the limitations of the turbulence model. In the curved channel after the intake, both experimental and numerical results show another type of bi-cellular circulations in which clockwise center-region circulations and counterclockwise circulations near the inner bank and the free surface (inner-bank circulations) are captured. The study shows that the numerical model very satisfactorily predicts streamlines, velocity field and flow pattern in the channel and in vicinity of the intake. Investigation of flow pattern around lateral intake in channel bends shows that contrary to the case of flow diversion in straight channels, the width of the dividing stream surface near water surface level is greater than that of near bed level. Finally, the effects of position and diversion angle of the lateral intake, discharge ratio and upstream Froude number on the flow pattern are investigated.

Reduction of Bend Scour by an Outer Bank Footing: Footing Design and Bed Topography

2007 ◽  
Vol 133 (2) ◽  
pp. 139-147 ◽  
Author(s):  
Marta Roca ◽  
Juan Pedro Martín-Vide ◽  
Koen Blanckaert
Keyword(s):  
Bed Topography ◽  
Outer Bank

scholarly journals Bed-Shear Velocity Measurement in Curved Open Channel

2021 ◽  
Vol 004 (01) ◽  
pp. 093-105
Author(s):  
Sumiadi Sumiadi ◽  
Bambang Kironoto ◽  
Djoko Legono ◽  
Istiarto Istiarto
Keyword(s):  
Stress Distribution ◽  
Reynolds Stress ◽  
Measurement Data ◽  
Shear Velocity ◽  
Complex Flow ◽  
Curved Channel ◽  
Distribution Method ◽  
Bed Topography ◽  
Curved Channels ◽  
River Bed

Generally, the condition of the rivers in Indonesia are alluvial rivers which had meanders, where the change in the river bed topography often occur. One of the parameters associated with changes in the river bed topography is bed-shear velocity, or Reynolds stress. The bed-shear velocity can be calculated by the Reynolds stress distribution method and the Clauser method which commonly used in straight channels. In fact, on natural channel there is a curve and even a meandering channel. With more complex flow conditions, the use of the Clauser method in curved channels can be questioned, is it still accurate or not. In this paper, both methods will be discussed by comparing the measurement data in the laboratory using 180 curved channel with flat bed. The results of data analysis show that the use of these two methods in curved channels produces an average difference of around 19.81%, where the Clauser method gives greater results and better tendencies. Apart from the differences in the results given, it can be said that the Clauser method as well as the Reynolds stress distribution method can still be used to calculate the bed-shear velocity in the curved channel

scholarly journals Effect of Sediment Density on the Bed Topography in a Channel Bend Using Numerical Modeling

2016 ◽  
Vol 15 (2) ◽  
pp. 22
Author(s):  
M. Vaghefi ◽  
Y. Safarpoor ◽  
S.S. Hashemi
Keyword(s):  
Numerical Modeling ◽  
Maximum Amount ◽  
Numerical Analyses ◽  
Spur Dike ◽  
Bed Topography ◽  
Channel Bend ◽  
Outer Bank ◽  
Bed Scour

 In this paper, the bed topography of a channel at a 90-degree bend was studied at the T-shaped spur dike installed at the middle of the outer bank. Numerical analyses were performed with the Sediment Simulation in Intakes with Multiblock Option (SSIIM) model. Three relative curvatures (R/B =  2, 3, and 4) related to the three sediment densities (P  = 2.35, 2.5, and 2.65) were modeled in nine cases and the effects of sediment density on the bed scour patterns were studied. It was observed that the maximum amount of scour occurred near the head of the dike wing at the dike’s upstream, and the maximum amount of sedimentation occurred at the inner bank of the bend exit. By increasing the sediment density when R/B  = 4, the maximum scour and sedimentation decreased to 27.41% and 46.15%, respectively. When R/B  = 3, the maximum scour and sedimentation decreased to 25.93% and 23.91%, respectively. When R/B  = 2, the maximum scour and sedimentation decreased to 25.98% and 10%, respectively. 

scholarly journals Self-Adjustment Process of Flow Pathway in a Narrow Curved Channel

2018 ◽  
Vol 40 ◽  
pp. 02011
Author(s):  
Hiroshi Hayakawa ◽  
Tomonori Kitao ◽  
Nobuo Sato
Keyword(s):  
Dynamic Equilibrium ◽  
Fine Sand ◽  
Flood Plain ◽  
Flow Path ◽  
Adjustment Process ◽  
Left Bank ◽  
Curved Channel ◽  
Meandering River ◽  
Outer Bank ◽  
Response To Change

This study focuses on river bed fluctuation of the curved channel with channel width narrowing, where is located in the inlet of the old meandering river with 30 (m) width from straightened one with 80 (m) in the Kushiro Wetland. From field survey, in response to change in water and sediment discharges, significant streamwise variation in water flow width in the curved channel adjusts in order to establish the dynamic equilibrium. Along the outer bank of curved channel, the secular bed deposit beside the outer bank is increasing, and as a result, the main streamline flows into the old river along the inner bank as left bank. Moreover, this narrowing curved channel easily leads to overspill some flood water including rich suspended sediment and to deposit some fine sand near channel side flood plain. We intend to explain above significant bed variations by using movable bed experiments with the distorted model. As a result, we suggest, though qualitatively, that the existence of the sandbar upstream of the curved channel causes the autonomous specification of the flow path width in the curved channel with a narrowing width, and that this flow path is formed.

Flow and Mass Transfer of Pyrolytic Aviation Kerosene in Curved Channel

2021 ◽  
Vol 35 (1) ◽  
pp. 53-62 ◽  
Author(s):  
Keyu Gong ◽  
Yong Cao ◽  
Yu Feng ◽  
Ying Zhang ◽  
Jiang Qin
Keyword(s):  
Mass Transfer ◽  
Curved Channel ◽  
Aviation Kerosene

Benthic communities in the Southwest Atlantic Ocean: Conservation value of animal forests at the Burdwood Bank slope

2020 ◽  
Vol 30 (3) ◽  
pp. 426-439 ◽  
Author(s):  
Laura Schejter ◽  
Gabriel Genzano ◽  
Esteban Gaitán ◽  
Carlos D. Perez ◽  
Claudia S. Bremec
Keyword(s):  
Atlantic Ocean ◽  
Benthic Communities ◽  
Conservation Value ◽  
Southwest Atlantic ◽  
Bank Slope ◽  
Burdwood Bank ◽  
Ocean Conservation

scholarly journals Short-term Variations in Strain and Surface Tilt on Storglaciären, Kebnekaise, Northern Sweden

1989 ◽  
Vol 35 (120) ◽  
pp. 201-208 ◽  
Author(s):  
Peter Jansson ◽  
Roger LeB. Hooke
Keyword(s):  
Water Pressure ◽  
High Water ◽  
Ice Thickness ◽  
Gradual Change ◽  
Short Term ◽  
Glacier Surface ◽  
Vertical Movements ◽  
Bed Topography ◽  
The Waves ◽  
Local Uplift

AbstractTiltmeters that can detect changes in slope of a glacier surface as small as 0.1 μ rad have been used on Storglaciären. The records obtained to date have been from the upper part of the ablation area, where the bed of the glacier is overdeepened. A total of 82 d of records has been obtained for various time periods between early June and early September.There is generally a gradual change in inclination of the glacier surface over periods of several days, but these changes do not appear to be systematic. In particular, they are not consistent with vertical movements of stakes located 2–3 ice thicknesses away from the tiltmeters. This suggests that the tiltmeters are sensing disturbances over areas with diameters comparable to the local ice thickness.Superimposed on these trends are diurnal signals suggesting rises and falls of the surface just up-glacier from the riegel that bounds the overdeepening on its down-glacier end. These may be due to waves of high water pressure originating in a crevassed area near the equilibrium line. If this interpretation is correct, the waves apparently move down-glacier at speeds of 20–60 m h−1and become sufficiently focused, either by the bed topography or by conduit constrictions, to result in local uplift of the surface. Also observed are abrupt tilts towards the glacier center line shortly after the beginning of heavy rainstorms. These appear to be due to longitudinal stretching as the part of the glacier below the riegel accelerates faster than that above. Water entering the glacier by way of a series of crevasses over the riegel is believed to be responsible for this differential acceleration. In June 1987, a dramatic event was registered, probably reflecting the initial summer acceleration of the glacier.

Sign in / Sign up

Export Citation Format

Share Document