Organized Horizontal Vortices and Lateral Sediment Transport in Compound Open Channel Flows

Ikeda, Syunsuke; Sano, Takayuki; Fukumoto, Masatake; Kawamura, Kazuhiro

doi:10.2208/jscej.2000.656_135

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…The experiment by Ikeda et al [27] showed that the large-scale vortices appeared when the water depth on the floodplain is relatively shallow. Such large-scale vortices can cause re-suspension of sediment deposited on the flood plain prior to a flood (Ikeda et al [28]). In the 2006 flood, because the water level stopped rising further after shallowly inundated the point bar, coherent vortices must be present and dominant.…”

Section: Resultsmentioning

confidence: 99%

Dual Behavior of Suspended Sediment Concentration in a Regulated River

Huang¹

2011

WJM

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Better understanding of suspended sediment transport processes allows for better management of both rivers and coasts. Based on field data and sediment transport energy theory, this study presents an analysis on the suspended sediment hysteresis in the Lower Tenryu River of Japan in connection to the channel carrying capacity of suspended sediment and morphological characteristics. The transport of suspended sediment in the river exhibited dual behaviors according to the magnitude of flood. It was transport-limited in a 10-year flood while supply-limited in a 30-year flood. In the supply-limited case, the temporal variation of suspended sediment concentrations followed the hydrograph well. In the transport-limited case, however, there was a time lag between peak discharge and maximum suspended sediment concentration. The mechanism of time lag was further clarified to be different for the 10-year flood and a small flood. The objective of this paper is to shed some new light on the relationship of suspended sediment to flow and channel conditions

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Section: Resultsmentioning

confidence: 99%

Dual Behavior of Suspended Sediment Concentration in a Regulated River

Huang¹

2011

WJM

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“…Coherent flow structures can be caused by the internal or external flow disturbance in the river. The internal disturbances include the helical secondary flow motion along the longitudinal direction caused by turbulence or centrifugal force (Einstein & Li 1958;Perkins 1970) and the plan-form vortices due to the high velocity gradient typically occur during an overbank flow condition (Sellin 1964;Ikeda 2001;Knight et al 2009). The external disturbance of the flow is caused by an external structure, such as the MHK device itself or a bridge pier.…”

Section: Spatial Averagingmentioning

confidence: 99%

Ornl Adcp Post-Processing Guide and Matlab Algorithms for MHK Site Flow and Turbulence Analysis

Gunawan

Neary²

2011

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“…Computation of flow field of water is conducted on the basis of SDS-2DH model [Nadaoka and Yagi, 1993] which is the depthaveraged version of LES model. Some researchers have applied this model to simulate the turbulent mixing in flow with a group of vegetation [Ikeda and Sano, et al, 2000;Sekine and Yajima, 2004]. The details of the flow model were described in the published papers [Ikeda and Sano, et al, 2000].…”

Section: River Channel Deformation With Vegetationmentioning

confidence: 99%

“…Some researchers have applied this model to simulate the turbulent mixing in flow with a group of vegetation [Ikeda and Sano, et al, 2000;Sekine and Yajima, 2004]. The details of the flow model were described in the published papers [Ikeda and Sano, et al, 2000]. In this study, the finite difference method was employed to discretise the governing equations of flow with the staggered grid mesh, and then the equations were solved numerically.…”

Section: River Channel Deformation With Vegetationmentioning

confidence: 99%

Gravel-Silt-Packed Bed Model and Its Application to the River Channel Deformation with Vegetation

Sekine

2010

IJECE

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Channel deformation process of a gravel-bed river with vegetation zone was investigated in the present study. The channel is assumed to be constituted by gravel-silt mixture. When we simulate this deformation process, the evaluation of erosion rate of silt from gravel-bed is important. The formula by Ashida and Fujita [1986] is only the applicable one. In this study, a "gravel-silt-packed bed model" was newly invented and introduced in order to make the computation effectively with the above mentioned formula. The model enables us to predict a temporal variation of sediment composition in bed as well as the bed elevation reasonably. In this paper, the model was applied to investigate the effect of both a zone of vegetation and a silt erosion and deposition on the channel deformation. As a result, it was confirmed that a depositional terrace like landform formed just inside the vegetation zone around a water margin, which was observed and reported by Fujita et al. [1996].

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Organized Horizontal Vortices and Lateral Sediment Transport in Compound Open Channel Flows

Cited by 5 publications

References 7 publications

Dual Behavior of Suspended Sediment Concentration in a Regulated River

Dual Behavior of Suspended Sediment Concentration in a Regulated River

Ornl Adcp Post-Processing Guide and Matlab Algorithms for MHK Site Flow and Turbulence Analysis

Gravel-Silt-Packed Bed Model and Its Application to the River Channel Deformation with Vegetation

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