Abstract:Erosion in river bends causes loss of agricultural lands, adjacent facilities, and fish habitat. W-weir structures are recommended for controlling and reducing soil erosion as well as developing habitat for fish and other aquatic organisms. This paper presents the results of an experimental study carried out to investigate the effect of a W-weir structure on a sinusoidal channel with a sinuosity of 1.12 on the scour volume and type. The W-weir was applied in three heights (0.5, 1, and 1.5) with H o /h ratio (t… Show more
Erosion and sedimentation in streams, lakes, reservoirs, and watersheds are a global issue. Runoff and flood waves erode soil and streambank material, destroying agricultural land. Erosion and sedimentation in water bodies induce soil loss in the watershed and diminish channel flow depth and conveyance. Agricultural runoff can pollute aquatic ecosystems by carrying sediment. As per IPCC 2019 report, in tropical and subtropical regions, the impacts of soil erosion can be observed from the high rates of soil loss, in some cases exceeding 100 t/ha/yr. Therefore, it becomes necessary to address the problem of erosion and sedimentation with serious concern. This paper focuses on highlighting the research advancements in the field of erosion and sedimentation phenomenon, estimation of erosion and sedimentation rate in watersheds, streams and reservoirs and resulting impact assessment from reach scale to watershed scale in last five decades and assessing further research scope in this regard. A bibliometric analysis considering 1000 research articles database extracted from the Web of science has been conducted in the Biblioshiny platform using the R-programming tool. The Bibliometric analysis shows an annual scientific production growth of 2.27% in the field of erosion and sedimentation. Most of the articles have been published in the USA, followed by China, UK, and Belgium. This is the first such bibliometric analysis of erosion and sedimentation together considering one thousand articles associated with it. The study can help in observing the publication trend and identifying the recent emerging topics for research in the field of erosion and sedimentation.
Erosion and sedimentation in streams, lakes, reservoirs, and watersheds are a global issue. Runoff and flood waves erode soil and streambank material, destroying agricultural land. Erosion and sedimentation in water bodies induce soil loss in the watershed and diminish channel flow depth and conveyance. Agricultural runoff can pollute aquatic ecosystems by carrying sediment. As per IPCC 2019 report, in tropical and subtropical regions, the impacts of soil erosion can be observed from the high rates of soil loss, in some cases exceeding 100 t/ha/yr. Therefore, it becomes necessary to address the problem of erosion and sedimentation with serious concern. This paper focuses on highlighting the research advancements in the field of erosion and sedimentation phenomenon, estimation of erosion and sedimentation rate in watersheds, streams and reservoirs and resulting impact assessment from reach scale to watershed scale in last five decades and assessing further research scope in this regard. A bibliometric analysis considering 1000 research articles database extracted from the Web of science has been conducted in the Biblioshiny platform using the R-programming tool. The Bibliometric analysis shows an annual scientific production growth of 2.27% in the field of erosion and sedimentation. Most of the articles have been published in the USA, followed by China, UK, and Belgium. This is the first such bibliometric analysis of erosion and sedimentation together considering one thousand articles associated with it. The study can help in observing the publication trend and identifying the recent emerging topics for research in the field of erosion and sedimentation.
“…Few studies have been conducted on weirs regarding improving flow patterns and river restoration. Abdollahpour et al (2017) investigated the patterns of erosion and sedimentation downstream of a W−Weir. They examined a sinusoidal channel with a sinuosity of 1.12.…”
Section: Introductionmentioning
confidence: 99%
“…The key criteria influencing scour size and shape were the inflow Froude number, weir height, and the angle between two inner arms of the W−Weir. According to the study's findings, reducing the height of the W−Weir reduced scour volume, on average, for different input Froude numbers [14]. Kurdistani and Pagliara [15] investigated the scour phenomena and bed morphologies downstream of curved channel cross-vane structures.…”
Different flow-altering methods, such as W−Weirs, have been developed to reduce erosion. For this study, we performed two experiments: (1) installing a W−Weir in various positions to determine the best angle for placement, and (2) investigating the variation of flow patterns and bed shear stress distribution in a 90-degree sharp bend by measuring the 3D components of flow velocities, with and without W−Weirs, where the greatest scour depth occurs. The results from the three installation angles indicate that less scour depth and volume of sediment removal occur when the weir is located close to the end of a bend. In addition, the value of the secondary circular power without a weir was higher than the position with a weir; however, this value significantly increased at 70 degrees due to turbulence flow near the W−Weir. This secondary flow power reduction at 45 degrees with a W−Weir increased by 65.8 percent for a Froude number value of 0.17, and by 29.8 percent for a Froude number value of 0.28, compared to values without the W−Weir, respectively.
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