Effects of Vegetation Cover on Runoff and Sediment in Field Prototype Slope by Experimental

Yang, Cheng; Xiao, Pei Qing; Zhen, Bin; Shen, Zhen; Li, Li

doi:10.4028/www.scientific.net/amr.518-523.4707

Cited by 5 publications

(3 citation statements)

References 0 publications

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“…Yang et al [7] designed a series of experiments in a slope flume, and the protection effects of two different fiber reinforced mats were compared with bare slope flow. When the slope is equipped with artificial grass, the sediment erosion volume is significantly decreased to 2% -5% of that on the bare slope, and the flow rate on the slope and the time used to reach a balanced profile drop remarkably as well.…”

Section: Fiber Reinforced Matmentioning

confidence: 99%

Scour Protection of Underwater Pipelines

Xie¹,

Zhu²

2018

J. Civ. Eng. Constr.

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A detailed literature review on the protection of local scour beneath a submarine pipeline is presented. The review covers two basic parts of countermeasures against the pipeline scour, namely preventing the onset of scour and stimulating the self-burial of a pipeline. The research progress on the methods of the two sections is discussed in detail separately. The methods preventing the onset of scour have been extensively studied, but the understanding on their mechanisms is yet to be improved. The progress in stimulating the self-burial of a pipeline mainly focuses on a spoiler attached to a pipeline, which is investigated comprehensively with both experiments and numerical simulations. Both parts of countermeasures have been applied in some practical engineering projects and the protection effects are generally satisfying.

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Section: Fiber Reinforced Matmentioning

confidence: 99%

Scour Protection of Underwater Pipelines

Xie¹,

Zhu²

2018

J. Civ. Eng. Constr.

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“…If properly designed, the local scour near the flexible structures is less significant compared with that of rigid structures. Such structures include inflatable flexible membrane dams [22], mattress curtain sets [23], fiber reinforced mats [24], suspended curtains [25], geotextile mattress with sloping curtain [26,27], geotextile mattress with sloping plate [28], etc.…”

Section: Introductionmentioning

confidence: 99%

Local Scour Near Flexible Flow Deflectors

Xie

Zhu

Huang

et al. 2020

Water

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Rigid flow deflectors are usually used on water flow beds to protect engineering structures such as breakwater in coasts and to regulate flow routes in open channels. To reduce its side-effects, i.e., local scour at the toe of deflectors, a flexible flow deflector is proposed, and the corresponding local scour was investigated in this study. A flume experiment was conducted to investigate local scour. To show the advantage of flexible deflectors, a control experimental test was also conducted using a traditional rigid deflector under the same blockage area configuration and the same flow conditions. The flow field near the flexible deflector was also measured to reveal the local flow field. The results show that the bed-scour develops near the toe edges of both flexible and rigid deflectors, but the maximum and averaged scour depths for the flexible deflector are smaller. This advantage of flexible deflector in scour depth is mainly caused by its prone posture, which induces the upward stretching and enlarging horizontally rotating vortex and the upward shifted vertically rotating vortex. The former dissipates more turbulent energy and the latter results in smaller bed shear stress, which lead to smaller scour depth directly. In addition, the up- and down-swaying movement of the flexible deflector can also assistant to dissipate more turbulent energy, thereby damping the intense of the horseshoe vortices and thus weakening scour depth as well. The results of this study provide an elementary understanding on the mechanisms of a flexible flow structure and an alternative deflector-device to reduce scour depth.

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“…The former aims at preventing the onset of scour by reducing the seepage hydraulic gradient across the pipeline with underwater structures. Such techniques include ripraps [14][15][16], flexible mattresses covering the pipeline [17][18][19], fiber reinforced mats [20], and impermeable plates placed between the pipeline and the seabed [1,21]. In the latter category of protection methods, attempts were made to accelerate scour hole development beneath the pipeline by modifying the cross-section profile of the pipeline.…”

Section: Introductionmentioning

confidence: 99%

Scour Protection Effects of a Geotextile Mattress with Floating Plate on a Pipeline

Zhu

Xie

2020

Sustainability

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Underwater pipelines are vital to the oil industry. Extending the service life of these pipelines is a key issue in improving the sustainability of oil transportation. A geotextile mattress with floating plate (GMFP) is a novel and sustainable countermeasure for scour and erosion control and is herein introduced to protect a partially buried pipeline from local scour in steady currents. A series of experiments was designed to verify the protection capabilities of the GMFP and investigate its parametric effects on protection. The average seepage hydraulic gradient under the pipeline was adopted to depict the protection effects of the GMFP, and was calculated with the pore pressure readings under the pipeline. The test results show that the GMFP is capable of protecting a pipeline from the onset of local scour in a unidirectional current. The average seepage hydraulic gradient below the pipeline decreases remarkably after a GMFP is installed. The average hydraulic gradient shows a descending trend with increased sloping angle α when 0.64 < sinα < 0.77. The hydraulic gradient hits a nadir at sinα = 0.77 and climbs with the increasing sloping angle when sinα > 0.82. The hydraulic gradient ascends when the bottom opening ratio δ increases from 0.167 to 0.231, due to the decreased intensity of the bottom vortex. The hydraulic gradient drops with a rising plate height, except for a fluctuation at Hp = 0.12 m. An approximate negative correlation is found between the obstruction height of the floating plate and the average hydraulic gradient under the pipeline. This could be partially attributed to the extension and amplification of the bottom vortex on the leeside of the pipeline due to the increased plate obstruction height.

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Effects of Vegetation Cover on Runoff and Sediment in Field Prototype Slope by Experimental

Cited by 5 publications

References 0 publications

Scour Protection of Underwater Pipelines

Scour Protection of Underwater Pipelines

Local Scour Near Flexible Flow Deflectors

Scour Protection Effects of a Geotextile Mattress with Floating Plate on a Pipeline

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