Protection of bridge piers against scouring with tetrahedral frames

Tang, Hongwu; Ding, Bing; Chiew, Yee‐Meng; Shi-Long, Fang

doi:10.1016/s1001-6279(10)60012-1

Cited by 37 publications

(11 citation statements)

References 11 publications

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“…Flow altering countermeasures include: sacrificial piles and sills, collars, slots, etc. (Tang et al [5]). …”

Section: Introductionmentioning

confidence: 99%

“…In the context of flow altering, Tang et al [5] used tetrahedral frames protection and reported that it was very effective in reducing the scour depths by 50% or more. They also showed that the percentage reduction of scour depth decreased as the velocity ratio V/V c decreased, with V being the mean flow velocity and V c the critical flow velocity.…”

Section: Introductionmentioning

confidence: 99%

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Effect of a subsidiary pillar on local scour at a bridge pier

Alshehri

Fouli

Ead

2013

WIT Transactions on Ecology and the Environment

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The objective of this experimental study was to examine the effect of a subsidiary pillar, to be located upstream of bridges, on the development of local scour at a single circular bridge pier. Experiments were conducted to investigate the effect of: a) the spacing between the subsidiary pillar and the bridge pier, b) their relative diameters, and c) the Froude number on the dimensions of the scour hole and its temporal development. The experiments were conducted in a rectangular flume under clear water scour conditions mainly at a Froude number of 0.2 (preliminary experiments were also conducted at Froude number of 0.1 and 0.3). The results show that the maximum scour depth at the pier could be minimized using three different combinations of spacing and relative diameters. A reduction in the maximum scour depth of approximately 50% was possible compared to the pier-alone case.

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“…Flow altering countermeasures include: sacrificial piles and sills, collars, slots, etc. (Tang et al [5]). …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of a subsidiary pillar on local scour at a bridge pier

Alshehri

Fouli

Ead

2013

WIT Transactions on Ecology and the Environment

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“…On the one hand, turbulent jets including horizontal and vertical jets, submerged jets, plunging jets and twoand three-dimensional jets could be found [13,14,16,18,21]. On the other hand, mostly from field and laboratory data, empirical predictive formulae that calculate the equilibrium depth and length of the scour holes are available in the literature [14,15,21,[24][25][26][27][28]34].…”

Section: Introductionmentioning

confidence: 99%

Bed Morphology around Various Solid and Flexible Grade Control Structures in an Unstable Gravel-Bed River

Wang

Yang

Zhou

et al. 2018

Water

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Flexible grade control structures (GCSs) are increasingly popular alternative countermeasures consisting of conventional solid structures for protecting riverbeds from erosion. Among this structure typology, tetrahedron framed permeable weirs (TFPW) were proposed to stabilize riverbeds and protect cross-river structures. The bed morphology as well as the interactions among the structures, water flow and bed features have not been systematically analyzed. Therefore, based on the field data collected in the Jianjiang River, a series of physical model experiments were carried out in this study to investigate the river morphology in unstable gravel-bed rivers under five different structural conditions, including no GCSs, solid bed sills and flexible TFPW with three different layout types. Data on bedform features, topography changes and the volume of erosion or deposition were collected and analyzed. The results indicated that dramatic general erosion and bed armoring would occur without any protection. The bed would be protected from upstream erosion with bed sills, but, at the same time, in addition to general erosion and bed armoring downstream of the structures, deep local scour might pose a serious threat to structural safety. TFPW had good protective effects on riverbeds by preventing the bed from erosion and even inducing sediment deposition both upstream and downstream from the structures. Because the flexible structures have advantages in ecology, structural stability and construction, TFPW were suitable and optimal for riverbed stabilization in unstable gravel-bed rivers.

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“…Such effect and behavior are of interest to both the hydraulic and geophysical communities. Such a phenomenon can be found in both natural rivers and man-made canals, e.g., the lower Boise River Basin, Idaho, Lower Colorado River, USA, Yangtze River, New York canal (Berenbrock 1999;Tang et al 2009;Carlson and Petrich 1998).…”

Section: Introductionmentioning

confidence: 99%

Injection Effects on Sediment Transport in Closed-Conduit Flows

2016

Self Cite

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Experiments were conducted to investigate injection effects on sediment transport in closed-conduit flows. The results show that the sediment transport rate essentially remains unchanged when the ratio of the injection velocity and that at boiling, Vi/Vcr < 10. However, significant sediment transport rate is observed when Vi/Vcr increases beyond this limit. In the literature, three semi-empirical models have been developed to relate seepage effects on the sediment transport rate. The experimentally measured data in the pre-and post-boiling condition (Liu and Chiew 2014, and the present study, respectively) are compared with these models. The results show that the models of Francalanci et al. (2008) and Nielsen et al. (2001) perform poorly in predicting injection effects on the sediment transport. Although Yang's (2013) model could reasonably predict the influence of injection on the sediment transport rate in the post-boiling condition, it similarly fails when applied to the pre-boiling condition. Experiments were conducted to investigate injection effects on sediment transport in closed-conduit flows. The results show that the sediment transport rate essentially remains unchanged when the ratio of the injection velocity and that at boiling, V i /V cr < 10. However, significant sediment transport rate is observed when V i /V cr increases beyond this limit. In the literature, three semi-empirical models have been developed to relate seepage effects on the sediment transport rate. The experimentally measured data in the pre-and post-boiling condition (Liu and Chiew 2014, and the present study, respectively) are compared with these models. The results show that the models of Francalanci et al. (2008) and Nielsen et al. (2001) perform poorly in predicting injection effects on the sediment transport. Although Yang's (2013) model could reasonably predict the influence of injection on the sediment transport rate in the post-boiling condition, it similarly fails when applied to the pre-boiling condition.

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Protection of bridge piers against scouring with tetrahedral frames

Cited by 37 publications

References 11 publications

Effect of a subsidiary pillar on local scour at a bridge pier

Effect of a subsidiary pillar on local scour at a bridge pier

Bed Morphology around Various Solid and Flexible Grade Control Structures in an Unstable Gravel-Bed River

Injection Effects on Sediment Transport in Closed-Conduit Flows

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