Geotextile bag revetments for large rivers in Bangladesh

Oberhagemann, Knut; Hossain, Md. Makbul

doi:10.1016/j.geotexmem.2010.12.003

Cited by 35 publications

(17 citation statements)

References 3 publications

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“…The Sirajganj Hardpoint is a good example: It suffered frequent damage after its construction. As a result, although construction costs have significantly decreased in recent years through effective use of local materials (Oberhagemann and Hossain, ), long‐term channel stabilisation is hardly achievable with revetment‐type measures alone. On the other hand, Bandals are relatively active.…”

Section: Resultsmentioning

confidence: 99%

Hydraulic characteristics of typical bank‐protection works along the Brahmaputra/Jamuna River, Bangladesh

Nakagawa

Zhang

Baba

et al. 2013

J Flood Risk Management

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Severe bank erosion is one of the most challenging problems in the management of large rivers in Bangladesh. This paper describes the detailed flow patterns around typical bank-protection works on the Brahmaputra/Jamuna River as well as their morphological implications. Based on field surveys at several locations along this large alluvial river that are highly susceptible to erosion, attempts are made to clarify the flow fields and mechanisms of bank erosion. The performance of existing measures such as revetments and spur dykes are evaluated, and possible solutions for further enhancements are proposed. It is found that existing conventional works are generally huge in both size and cost, potentially exerting great disturbances on the river's dynamism and ecosystem. That said, the Bandal -a historied and indigenous structure -is cost-effective and environmentally friendly. This study suggests the recurrent use of Bandallike structures for channel stabilisation and flood management of the braided Brahmaputra/Jamuna River.

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Section: Resultsmentioning

confidence: 99%

Hydraulic characteristics of typical bank‐protection works along the Brahmaputra/Jamuna River, Bangladesh

Nakagawa

Zhang

Baba

et al. 2013

J Flood Risk Management

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“…Thus, in an effort to reduce the effects of hard revetments on waterways, some eco-friendly materials and techniques have been designed to emphasize stabilization of the bank slope and suitability for plant survival, as well as connections to the original natural aquatic environment, and to avoid changing the native ecosystem [20,21]. Many independent processes for bank slope ecological revetment design have been developed and applied in waterways, including geotextile bags [22,23], slope bio-management [24], gabions [25,26], and porous perforated bricks [27]. Notably, previous studies on ecological revetments have usually focused on bank stabilization rather than the role of porosity and suitability for plant survival [28].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on Influences of Bank Slope Ecological Revetments on Water Quality Purification Pretreating Low-Polluted Waters

Dai

2017

Water

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Abstract:To improve aquatic environmental quality and maintain channel stability against soil erosion, ecological bank slope revetments for surface water bodies were developed using a combination of prefabricated porous concrete spheres and vegetation methods, and a model set-up consisting of two equal-sized ditches with different types of bank slope revetments was constructed to evaluate the purification effects of ecological and hard revetments on water quality. The slope of one ditch was embanked with ecological revetments as an experimental treatment, while the other was embanked with hard revetments as a control. Pollutant removal from the ecological bank revetment ditch was significantly better in terms of the overall removal efficiencies of the chemical oxygen demand of manganese (COD Mn ), ammonia, total nitrogen (TN), and total phosphorus (TP), with two-to four-fold greater removal compared with that from hard slope revetments under the same operational conditions. Nutrient pollutants, including ammonia, TN, and TP had higher removal efficiencies than that for COD Mn in both experimental ditches. The dependence of the first-order rate constant (k 20 ) and temperature coefficient (θ) obtained from the Arrhenius equation indicated that the removal efficiencies for ammonia, TN, and TP were higher with greater rate constants (k 20 ) in the experimental ditch. In the ecological revetment ditch, the k 20 values for COD Mn , ammonia, TN, and TP were 0.054, 0.378, 0.222, and 0.266 respectively, around three-fold the values observed in the hard revetment ditch, but there was no obvious difference in θ values between the two ditches. The k 20 values of TN and TP in both ditches showed significant positive correlations with seasonal shifts, as the removal of nutrient pollutants is highly sensitive to water temperatures.

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“…As a classical method, armoring countermeasures provide a resistant layer against the hydraulic shear stresses. The armoring countermeasures include riprap, sand-filled geotextile bags (Oberhagemann and Hussain, 2011) and so on. It should be noticed that these structures' stability is reduced obviously when scour undermines the toe support or pore water pressures in the underlying soil builds because of the clog of revetment filter fabric.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations of Dynamic Wave Force on Seabed around a Geotextile Mattress with Floating Curtain

Xie

Zhu

Huang

2015

Journal of Coastal Research

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Xie, L.; Zhu, Y.; Huang, W., and Liu, C., 2015. Experimental investigations of dynamic wave force on seabed around a geotextile mattress with floating curtain.A new technique called geotextile mattress with floating curtain (GMFC) may be an advisable alternative countermeasure against seabed erosion, since it can allow deposited sediment dunes to form naturally at upstream and downstream sides of GMFC when installed in erosive flow. However, cyclic loading of wave actions can lead to liquefaction of the seabed under the mattress, reducing the maximum friction resistance of the mattress, even leading to instability of the GMFC structure. Thus, in this study a series of physical model tests in a rectangular flume were carried out to investigate the behavior of a single GMFC and the hydrodynamic environment around GMFC subjected to wave loading. The wave force on seabed was recorded by pressure gauges installed on the flume bed. Experimental results indicated that some area of the unmovable bed around GMFC suffered much higher hydrodynamic pressure under the wave action. The areas directly facing the bottom openings of GMFC are more prone to bear higher cyclic force of wave actions. Moreover, the results also illustrated that the highest cyclic force of wave actions on the seabed appears at a distance of the mattress-curtain height to the GMFC centerline. The parametric study indicated that the opening ratio has a significant impact on the wave force properties. ADDITIONAL INDEX WORDS:Mattress, erosion control, wave, sediment trapping, flexible structure.

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Geotextile bag revetments for large rivers in Bangladesh

Cited by 35 publications

References 3 publications

Hydraulic characteristics of typical bank‐protection works along the Brahmaputra/Jamuna River, Bangladesh

Hydraulic characteristics of typical bank‐protection works along the Brahmaputra/Jamuna River, Bangladesh

Comparative Study on Influences of Bank Slope Ecological Revetments on Water Quality Purification Pretreating Low-Polluted Waters

Experimental Investigations of Dynamic Wave Force on Seabed around a Geotextile Mattress with Floating Curtain

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