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Braid bar

About: Braid bar is a research topic. Over the lifetime, 44 publications have been published within this topic receiving 3964 citations.

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Proceedings ArticleDOI
Wei Ji1, Zulin Hua1, Wei Wu1, Jun Peng1
28 May 2012
TL;DR: In this article, a physical model of a multi-anabranch river with three braid bars was set up to explore the pollutant mixing characteristics in multianabranch rivers.
Abstract: The physical processes of the pollutant transport in multi-anabranch rivers are not clear at the present time compared with straight rivers and meandering rivers. A physical model of a multi-anabranch river with three braid bars was set up to explore the pollutant mixing characteristics in this paper. The multi-anabranch reach is separated into seven branches B1, B2, B3, B4, B5, B6 and B7 by three braid bars. Tracer release location was arranged at the centerline of the straight flume before branching reach. The cross-sectional concentration distributions at seven branches in the multi-anabranch river with three braid bars were measured and analyzed. The transport and mixing characteristics of pollutants in the multi-anabranch river with three braid bars were obtained. High concentration regions of branch B1 and B2 individually locate at left and right sides of braid bar M1. High concentration region of branch B3 locates at the bottom of the branch.

2 citations

Journal ArticleDOI
28 Oct 2020
TL;DR: In this paper, the geometrical characterization of braid bars in the Niger Delta has been studied using remote sensing and GIS based results from the geometric characterization of the braid bar deposits.
Abstract: Remote sensing and GIS based results from the geometric characterization of braid bar deposits in the Niger Delta are presented in this work. In this study the geometry of 67braid bar deposits from Landsat images of 1985 and 2015 were documented and compared to determine the relationship that exist between geometric dimensions and the amount of change that has occurred on them. The braid bars identified in this work are all associated with fluvial environment in the Niger Delta. Braid bars in 1985 are observed to be greater in length, width and area than those in 2015. R2 values (0.6) indicate that a significant relationship exists between braid bar length and width. R2 values also indicate a significant relationship exists between both length and area (0.7) and width and area (0.8) of the braid bars values within the study area. Thus, the utilization of width to predict the length and vice versa of braid bars is reasonable. Hence data from this study provides relevant information on size ranges that can be utilized for the efficient characterization, modelling and development of hydrocarbon reservoirs.

1 citations

Book ChapterDOI
01 Jan 2018
TL;DR: Ganga alluvial plain is one of the most densely populated regions of the world as discussed by the authors and it is drained by large snow-fed and small groundwater-fed rivers having different sources of water and sediment.
Abstract: Ganga alluvial plain is one of the most densely populated regions of the world. It is drained by large snow-fed and small groundwater-fed rivers having different sources of water and sediment. Ganga, the main river of this plain, is formed by the confluence of Bhagirathi River with the Alaknanda River at Devprayag in Uttarakhand Himalaya and after travelling a distance of about 2525 km, drains into Bay of Bengal where it forms a huge Sunderban Delta. It is the most sacred river of India. The important tributaries are Ramganga, Yamuna, Gomati, Ghaghara, Son, Great Gandak, Burhi Gandak and Kosi. It exhibits braid bar, lateral bar, natural levee and various river terraces and is characterized by narrow incised channel confined within very wide valley in direct response to the climate, tectonics and sea level changes. The sediments and water of this river supports the culture and agriculture of the Ganga Plain as it is a perennial source of water. However, from last few decades the interference of man in the natural cycle of the river has polluted the river, increased the sediment load, reduced the natural recharge area, reduced the water holding capacity and floodplain of the river and completely disturbed its biodiversity and thus increased the river-borne hazard by ignoring the law of nature and scientific facts.

1 citations

Journal ArticleDOI
TL;DR: In this paper, the results of measurements of three-dimensional velocities carried out in a laboratory model of a braided river are presented in order to recognize the structure of Reynolds stresses in turbulent flow near the bar.
Abstract: Turbulent phenomenon in braided rivers is much more complex as compared to the straight and meandering rivers. Turbulent flow characteristics around the braid bar are not thoroughly studied till now. The results of measurements of three-dimensional velocities carried out in a laboratory model of braided river are presented in this paper. Velocity is measured with the help of acoustic Doppler velocimeter. The main purpose of the study is the recognition of structure of Reynolds stresses in turbulent flow near the bar. Sweep quadrant event is considered to be the most important for entrainment of sediment particles as it exerts forces in the flow direction resulting in rolling and sliding of sediment particle. Similarly, the ejection event has been considered important for sediment transport since these events maintain the sediment particles in suspension. Special attention has been given to sweep and ejection bursting events due to their relation with the sediment entrainment and transport. The fra...

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20212
20202
20192
20184
20171
20151