Calculation of 2-dimensional bed evolution around spur-dike

Michiue, Masanori; Hinokidani, Osamu

doi:10.2208/prohe.36.61

Cited by 17 publications

(5 citation statements)

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“…Further, in Case 13, the range of the local scour hole formed upstream of the bridge pier model increased as the water level rose and fell iteratively, and the local scouring extended downstream of the oval specimen more widely than that when θ = 30 • at the left side. This tendency was similar to that of the experiments previously conducted by the authors and other researchers [16][17][18]. From these figures, it can be observed that the local scour depth increases as the water level rises and falls iteratively, and that the increase tends to converge after the third or fourth water flow.…”

Section: Progression Of the Local Scour Areasupporting

confidence: 90%

“…Figures [13][14][15][16][17][18] show the changes in the local scour length obtained from the experiment. The local scour extension shown in the figures is the distance from the starting point of the pier model to the point where the ground level reaches the surface of the soil layer in the measurement direction.…”

Section: Effect Of Water Level History and Pier Shape On Local Scour Lengthmentioning

confidence: 99%

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Effects of Dynamical Change in Water Level on Local Scouring around Bridge Piers Based on In-Situ Experiments

Kadono

KATO

Okazaki

et al. 2021

Water

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To evaluate the stability of bridge piers affected by the local scouring, the existing formulas for estimating the maximum local scour depth have been developed based on the results of experiments conducted under a constant water level. However, the applicability of these formulas to the cases where the water level rises and falls, such as a water level change in a real river, is not clear. In this study, water flow experiments were conducted on cylindrical and oval bridge pier models to investigate the effect of iterated water level change on the progression of local scour around piers. Results of experiments with cylindrical and oval pier showed that the local scour depth and length increased by an iterated action of the water level change; however, these values converged after the number of iterated actions reached a certain time. The local scour length at upstream of the bridge pier was approximately 1.8 times larger than the theoretical value, which was calculated through the local scour depth and angle of repose in water. The local scour length is an important parameter for defining the streambed protection zone, which is one of the measures against local scour, and we showed that the streambed protection zone needs to be defined more widely.

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Section: Progression Of the Local Scour Areasupporting

confidence: 90%

Section: Effect Of Water Level History and Pier Shape On Local Scour Lengthmentioning

confidence: 99%

Effects of Dynamical Change in Water Level on Local Scouring around Bridge Piers Based on In-Situ Experiments

Kadono

KATO

Okazaki

et al. 2021

Water

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“…Tingsanchali and Maheswaran (1990)은 수심평균된    난 류모델을 이용하여 수제 주변의 흐름 특성을 분석하였고, Molls et al (1995)는 유한차분모형과 와점성 모델을 적용한 수치모형을 이용하여 수제 주변의 흐름 구조를 파악하였다. Michiue and Hinokidani (1992) (Fig. 2).…”

Section: 서 론unclassified

“…Computed velocity magnitude profiles  is resultant velocity and   is approach velocity (a) Experimental result(Michiue and Hinokidani, 1992) (b) Numerical result Numerical and experimental results of bed changes around a spur dike…”

mentioning

confidence: 99%

Numerical investigation of space effects of serial spur dikes on flow and bed changes by using Nays2D

Lee¹,

Jang²

2016

Journal of Korea Water Resources Association

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In this study, the characteristics of flow and bed changes with variation of space and length of serial spur dikes were investigated with 2 dimensional numerical simulation. Upstream spur dike was affected by flow and made a role as a single spur dike. As time increased, local scouring was developed around outside of spur dike, and migrated upstream. The aggradation of the bed at the back of spur-dike was made at the initial stage of experiment and numerical modelling. However, the aggradation of the bed was increased in the downstream area. The scour whole around a spur dike upstream was not deep as the Dimensionless spur-dike interval () of the dike increased. The depth of scour hole was nearly constant at the dynamic equilibrium state. The dimensionless scour depth (  ) increased with . The spur dike downstream had the characteristics of single spur dike as the  was larger than 10. However, the spur dike downstream was affected by the dike upstream as the  was less than 4, and the bed of the upstream in the spur dike was aggradated and the effects of the serial spur dikes on the bed decreased.

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“…A significant effort was made to examine the characteristics of the flow around an abutment or dike 105 Engineering which adopted the numerical simulation. The research study, concentrated on this field was carried out by [1][2][3][4][5][6][7][8]. The above studies referred immediately to the abutment or a dike of the main feature of the flow area, such as the values of the time-averaged velocity, and they did not discover much about the impact of the dike or abutment on objective the separation zone at downstream.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the hydraulic interference between the baffles and the composite hydraulic structure

Qasim,

Abdulhussein,

Hameed

2023

Eureka: PE

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The purpose of the present study is to examine the influence of baffles presence at downstream system on weir gate hydraulic response. Two baffles configuration (triangle and angle shapes) are installed in bed flume. Two different spacing are used between the baffles and two different directions for baffles are also adopted. The study tries to investigate the variation in upstream Froude number, downstream Froude number, Reynolds number, actual discharge, discharge coefficient, downstream average water depth and the hydraulic system efficiency which is expressed as function of downstream water depth. It has been shown that the number of baffles has a direct and significant impact on flow hydraulic characteristics of weir-gate structure regardless of the spacing between baffles and the direction of baffles related to flow. Baffles number and spacing have essential impact on the water flow velocity of system and this impact leads to increase the flow resistance. The results clarify that the upstream Froude number, downstream Froude number, Reynolds number, actual discharge and discharge coefficient are decreased with the increase in baffles number except the average downstream water depth which increases with increase in baffles number. The efficiency of hydraulic system gives a good indicator for using baffles with weir-gate structure. At the end this paper shows a fruitful result of efficiency. This experiment run condense on the baffle’s numbers and directions with respect to the water flow direction at the downstream regime. So, the rises in the water level relies on the numbers and directions of the baffles as compare to the case without using baffles at the flume downstream region. The actual discharge and weir-gate discharge coefficient are more sensitive to the increase in the baffles’ numbers and the baffles direction with respect to the water flow direction

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Calculation of 2-dimensional bed evolution around spur-dike

Cited by 17 publications

References 0 publications

Effects of Dynamical Change in Water Level on Local Scouring around Bridge Piers Based on In-Situ Experiments

Effects of Dynamical Change in Water Level on Local Scouring around Bridge Piers Based on In-Situ Experiments

Numerical investigation of space effects of serial spur dikes on flow and bed changes by using Nays2D

Analysis of the hydraulic interference between the baffles and the composite hydraulic structure

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