Hydraulics of Submerged Triangular Weirs and Weirs of Finite-Crest Length with Upstream and Downstream Ramps

Hakim, Sara Seyed; Azimi, Amir H.

doi:10.1061/(asce)ir.1943-4774.0001207

Cited by 22 publications

(16 citation statements)

References 13 publications

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“…For analyzing the discharge of submerged weirs, Skogerboe et al [7] presented a simple method based on the momentum principle. Compared to other methods (e.g., [6,[8][9][10]), their method directly yields the submerged-flow discharge of a broad-crested weir. Pinto and Ota [11] studied the pressure distribution on the downstream face of a submerged dike.…”

Section: Introductionmentioning

confidence: 99%

Free Flow and Discharge Characteristics of Trapezoidal-Shaped Weirs

Zerihun¹

2020

Fluids

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A number of studies have considered the effects of weir design variations on the free- and submerged-flow characteristics of trapezoidal broad-crested weirs. It appears that the hydraulics of short-crested weir flows have received little attention; thus, the current knowledge is incomplete. By systematically analyzing a large set of experimental data, the present study aims to fill in this knowledge gap and to provide a complete description of the discharge characteristics of trapezoidal-shaped weirs, including the salient features of two-dimensional weir flows. The analysis of the axial free-surface profiles for short-crested weir flows attested that the location of the nearest station for the correct measurement of the overflow depth under free-flow conditions is at η0 from the heel of the weir, where η0 is the upstream free-surface elevation. Additionally, an empirical equation for the free-flow discharge coefficient is proposed as being valid for a trapezoidal-shaped weir with varying upstream- and downstream-face slopes. The results of this investigation reveal that the streamline curvature and the slopes of the upstream and downstream weir faces significantly affect the streamwise flow patterns and, hence, the free-flow discharge.

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Section: Introductionmentioning

confidence: 99%

Free Flow and Discharge Characteristics of Trapezoidal-Shaped Weirs

Zerihun¹

2020

Fluids

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“…The satellites record changes in terrain, vegetation, and temperature, etc. [37]. Additionally, the National Aeronautics and Space Administration and the United States Geological Survey operate the Landsat series of satellites, which have continuously collected spectral information of the Earth's surface features for 40 years and created a data archive with irreplaceable coverage, length, quality, and details for scientific research.…”

Section: Satellite Datamentioning

confidence: 99%

Simulation of Lake Water Volume in Ungauged Terminal Lake Basin Based on Multi-Source Remote Sensing

et al. 2021

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Obtaining the water volume of small- and medium-sized lakes in enclosed watersheds with scarce data is a global focus of research. River flow into a lake is an important factor affecting the water volume. However, most river flow measurement methods involve long cycles, low efficiency, and transdisciplinary expertise, making rapid assessments in ungauged basins impossible. This paper proposes a remote sensing flow estimation method based on multi-source remote sensing data, which quickly assesses river flow and provides important input data for lake water volume simulation. The cross-section flow was estimated by extracting the river width. The calculated results were consistent with the measured data, with accuracy greater than 90%. The results compared with daily data measured at hydrological stations, and the Nash coefficient was greater than 0.9. Additionally, the simulation method for lake area, water volume, and water level was constructed using river inflow input data, greatly reducing the parameters required by the conventional lake water volume simulation method. Based on the remote sensing discharge estimation method, we quickly and conveniently obtained changes in river flow into the lake, simulated lake water volume, and provided the basis for water resource management in terminal lake basins with scarce data.

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“…Also, Sargison and Percy (2009) studied the flow of water over a solid embankment weir with 1V:2H, 1V:1H and vertical slopes in various combinations on the weir upstream and downstream faces. Hakim and Azimi (2017) conducted a series of laboratory tests to investigate the hydraulics of crump weirs and trapezoidal weirs with finite-crest lengths under the submerged-flow condition.…”

Section: Introductionmentioning

confidence: 99%