Three Abutment Scour Conditions at Bridge Waterways

Yorozuya, Atsuhiro; Ettema, Robert

doi:10.1061/(asce)hy.1943-7900.0001053

Cited by 13 publications

(12 citation statements)

References 9 publications

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“…It is generally known that scour around abutment is caused by the flow contraction due to the blockage of the abutment and the large‐scale turbulence from flow separation at the tip of abutment. Hence, abutment and contraction scour may occur concurrently, and it is often difficult to separate both of them (Abdelaziz & Lim, 2021; Ettema et al, 2010; Hong, 2012; Yorozuya & Ettema, 2015). In this present analysis, the effect of contraction is included in the abutment scour formulation.…”

Section: Resultsmentioning

confidence: 99%

“…The variation of

u_{f} t_{e} / y_{f}

with (

B_{f} - normalL true) / B_{f}

for the present study is shown in Figure 6. The term (

B_{f} - normalL true) / B_{f}

represents the effect of contraction scour for abutment on floodplain, and some studies have suggested that the effect of contraction scour should be included in the abutment scour prediction formulas because abutment and contraction scour may occur concurrently (Ettema et al, 2010; Sturm et al, 2011; Yorozuya & Ettema, 2015). However, Melville and Coleman (2000) disagreed and reported that the two types of scour should be independent.…”

Section: Resultsmentioning

confidence: 99%

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Development of scour hole depth around setback abutment in a compound channel

Abdelaziz

Lim

2021

Water & Environment J

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This study focuses on scour depth development around 45° wing‐wall setback abutments in a compound channel. The results show that the scour development curves almost have similar shape and they can be described using exponential function. It is generally observed that the scour hole achieved 80% of the equilibrium scour depth at a scour time equals to 25% of the equilibrium scour time. Additionally, an increase in the relative abutment length and the contraction ratio causes an increase in the equilibrium time. However, this time decrease with increasing flow depth ratio. Finally, new empirical equations are proposed to predict the development of scour depth and the time to reach the equilibrium state. These equations will be useful to predict these characteristics of scour hole especially for setback abutments in compound channel and predict the temporal development scour depth for previous studies that have available data related to maximum scour depth.

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Section: Resultsmentioning

confidence: 99%

“…The variation of

u_{f} t_{e} / y_{f}

with (

B_{f} - normalL true) / B_{f}

for the present study is shown in Figure 6. The term (

B_{f} - normalL true) / B_{f}

Section: Resultsmentioning

confidence: 99%

Development of scour hole depth around setback abutment in a compound channel

Abdelaziz

Lim

2021

Water & Environment J

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“…Table 4.9 VW Data of Chua (2013) in compound channel………….. Kose (2007) in rectangular channel………….. Table 4.16 The suggested abutment shape factors…………………….. Table 4.17 ST Data of Ballegooy (2005) in compound channel………. The position of deepest point of scour hole for erodible spill through abutment (Yorozuya and Ettema, 2015).. Scour Type 1a -local scour on bed of main channel (Ettema et al, 2003)………………………………….…”

Section: List Of Tablesmentioning

confidence: 99%

“…As result, as the flow intensity decreases, the location of maximum scour depth shifts further laterally from the abutment nose to the centerline of flume. Yorozuya and Ettema (2015) experimentally studied the position of maximum scour depth around spill-through setback erodible abutment to check the geotechnical stability of erodible embankment. They used similar coordinates of Ballegooy (2005) and Melville et al (2006) (see Figure 2.11).…”

Section: Location Of Maximum Scour Depthmentioning

confidence: 99%

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Localized scour around setback abutment in compound channel

Younes¹

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CHAPTER 4 RESULTS AND ANALYSIS…………………4.1 Introduction…………………………………………………...… 4.2 Dimensional analysis.…………………………………………… 4.3 Geometry of scour hole…………………………………………. 4.4 Flow visualization around abutment……………………………. 4.5 Location of maximum scour depth …………………………….. iv 4.5.1 Time development of location of maximum scour depth…… 87 4.5.2 Effects of 𝐿/𝑦 𝑓 , 𝐿 𝑐 /𝐿 and 𝑢 𝑓 /𝑢 𝑐 on location of maximum scour depth at equilibrium condition……………………….. 90 4.5.3 Proposed equations to predict the location of maximum scour depth………………………………………………… 94 4.5.4 Comparison with formulas of previous studies……………. 95 4.6 Dimensions of scour hole and its volume at the equilibrium state……………………………………………………………… 99 4.6.1 Effects of 𝐿/𝑦 𝑓 , 𝐿 𝑐 /𝐿 and 𝑢 𝑓 /𝑢 𝑐 on dimensions of scour hole and its volume ………………………………………….. 99 4.6.2 Effects of flow depth ratio on dimensions of scour hole and its volume……………………………………………….. 4.6.3 Effects of degree of flow contraction on flood plain on dimensions of scour hole and its volume……………………. 4.6.4 Proposed equations to predict the dimensions of scour hole and its volume……………………………………………….. 4.7 Time development of scour hole characteristics………………... 4.7.1 Time development of scour depth………………………….. 4.7.2 Equilibrium time of scouring process, 𝑡 𝑒 ……………..…….. 4.7.3 Proposed equation to predict the equilibrium time of scouring process…………………………………………..…. 4.7.4 Time development of scour hole length, width, area and Volume……………………………………………………….

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Effect of abutment aspect ratio on clear‐water scour in floodplains

Abdelaziz

Lim

2019

River Research & Apps

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Scour around abutments is recognized as one of the main reasons of bridge foundations failure. This paper presents the experimental results of the effects of abutment width and length on the scour development up to its equilibrium condition around 45° wing‐wall setback abutments in a compound channel. The developing scour hole characteristics are tested for three different lengths and widths at different time intervals until its equilibrium scour conditions. The findings showed that the abutment width has a profound effect on the characteristics of the scour hole, contradicting the results of previous studies. Generally, an increase in the relative abutment width leads to a reduction in the scour depth and width. However, the scour length, area, and volume initially increase with an increase in the relative abutment width, Lc/yf, from 1.33 to 10.67, where Lc is the abutment width and yf is the floodplain flow depth, and then these characteristics decrease significantly with a much wider abutment, Lc/yf, from 10.67 to 21.33. Overall, the effects of the abutment width on abutment scour should be accounted. To this end, empirical equations are proposed to predict the scour hole characteristics. Scour data from previous studies are also used to compare with the proposed equations.

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Three Abutment Scour Conditions at Bridge Waterways

Cited by 13 publications

References 9 publications

Development of scour hole depth around setback abutment in a compound channel

Development of scour hole depth around setback abutment in a compound channel

Localized scour around setback abutment in compound channel

Effect of abutment aspect ratio on clear‐water scour in floodplains

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