Evaluation and modeling scouring and sedimentation around downstream of large dams

Movahedi, Azin; Kavianpour, Mohammad Reza; Yamini, Omid Aminoroayaie

doi:10.1007/s12665-018-7487-2

Cited by 38 publications

(13 citation statements)

References 33 publications

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“…With the development of computer science, numerical simulations based on Computational Fluid Dynamics (CFD) codes (e.g., Flow-3D(Three-Dimensional), Fluent) have been wildly used. The simulation results have been proved to be consistent with experimental results [21][22][23][24][25][26][27][28][29][30]. For tandem piers, Palau-Salvador et al [31] conducted numerical simulations around two submerged tandem piers and presented flow streamlines at different planes.…”

supporting

confidence: 66%

Numerical Simulation of Velocity Field around Two Columns of Tandem Piers of the Longitudinal Bridge

Zheng

Zhang

2020

Fluids

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This research explores the effects of different spans of two columns of tandem piers on the characteristics of x-velocity near the river bed based on computational fluid dynamics (CFD) simulations. With a span shorter than 27.5D (D is the diameter of piers), the shape and the lateral range of the x-velocity increases with the increase of distance downwards the x-direction. For the area between the tandem piers and the wall, the VRi/VR1 (the ratio of the x-velocity at the i-th row to the x-velocity of the first row in each model) near the wall increases up to 1.26. For the area between the two columns of tandem piers, the profile of VRi/VR1 changes from a “∩-shape” to an “M-shape” in each model. RAVC (average velocity change ratio) of different spans increases gradually and tends to be stable with the increases of the span. The largest RAVC is about −17.66% with a span of 0.52 m. The RMV (the ratio of the maximum x-velocity among piers in each row in different models to the maximum x-velocity of the two piers arranged side by side) of piers in the first row of different models is around 0.95. The RMV becomes 0.82 at the second pier in each model when the span is shorter than 27.5D, and increases to 0.91 if the span is longer than 27.5D. If the span is longer than 27.5D, the RMV of different piers are close to each other from the 2nd pier to the last one.

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supporting

confidence: 66%

Numerical Simulation of Velocity Field around Two Columns of Tandem Piers of the Longitudinal Bridge

Zheng

Zhang

2020

Fluids

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“…Identifikasi proses sedimentasi pada suatu perairan dapat dikontrol dengan faktor kedalaman perairan. Perairan akan teridentifikasi sebagai perairan yang mengalami sedimentasi jika kondisi perairan dangkal tetapi keruh [18], [19]. Perairan yang dalam tetapi keruh juga dapat menjadi indikator bahwa perairan tersebut membawa material sedimen terlarut dalam jumlah yang cukup banyak, tetapi arus air cenderung kuat, sehingga proses yang telah terjadi bukan pengendapan, melainkan penggerusan dasar perairan [19], [20].…”

Section: Pendahuluanunclassified

Analisis Dinamika Tingkat Kekeruhan Dan Kedalaman Relatif Perairan Di Waduk Sutami Kabupaten Malang

Rusydi

Masitoh²

2021

jfmr

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Penurunan fungsi waduk Sutami yang berupa sedimentasi intensif dalam kurun waktu 2013-2019 perlu dilakukan upaya identifikasi dan monitoring. Upaya ini dilakukan dengan memanfaatkan teknologi penginderaan jauh yang bertujuan untuk menganalisis dinamika sedimentasi perairan berdasarkan kedalaman relatif air dan tingkat kekeruhan air di waduk Sutami pada musim kemarau tahun 2013-2019. Citra satelit Landsat 8 OLI diolah untuk mendapat nilai Relative Water Depth (RWD) dan Normalized Difference Turbidity Index (NDTI). Hasil penelitian menunjukkan bahwa pada tahun 2013 hingga tahun 2019, kenampakan air keruh cenderung teridentifikasi di bagian timur waduk yang juga merupakan inlet waduk Sutami. Analisis kedalaman relatif air dilakukan untuk mengetahui dampak sedimentasi terhadap perubahan kedalaman perairan. Tingkat kekeruhan dan kedalaman relatif perairan tidak berhubungan langsung yang kuat secara statistik. Semakin keruh suatu perairan, maka belum tentu kedalaman relatif pada perairan tersebut menjadi semakin dangkal. Proses sedimentasi perairan di waduk Sutami yang terjadi pada tahun 2013-2019 menunjukkan bahwa proses tersebut dipengaruhi oleh tingkat kekeruhan.

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“…Plunge pool, located at the downstream of spillway, is an important structure for flow energy dissipation and riverbed erosion protection, and water level and water surface fluctuation of plunge pool have important influence on plunge pool design and operation, especially for sidewall height [19]. Therefore, the water level at the sidewall of the plunge pool (atomization wind area) during spillway flooding is an important measurement task.…”

Section: Study Sitementioning

confidence: 99%

A Newly Developed Unmanned Aerial Vehicle (UAV) Imagery Based Technology for Field Measurement of Water Level

Ang

Wang

et al. 2019

Water

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Field measurement of water level is important for water conservancy project operation and hydrological forecasting. In this study, we proposed a new measuring technique by integrating the advantages of unmanned aerial vehicle (UAV) photogrammetry and image recognition technology. Firstly, the imagery of water fluctuation process was captured by an UAV airborne camera, and water surface line in the imagery was recognized and extracted using image recognition technology. Subsequently, successive water levels at a measuring section were calculated by parameter calibration. Statistical parameters of water levels, such as maximum, average, and minimum values during the capturing period were also calculated. Additionally, we introduced a correction method to offset the error caused by UAV drift. The newly proposed method was tested in field measurement for Miaowei hydropower station, China, and the results showed that the method is reliable and adoptable.

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Evaluation and modeling scouring and sedimentation around downstream of large dams

Cited by 38 publications

References 33 publications

Numerical Simulation of Velocity Field around Two Columns of Tandem Piers of the Longitudinal Bridge

Numerical Simulation of Velocity Field around Two Columns of Tandem Piers of the Longitudinal Bridge

Analisis Dinamika Tingkat Kekeruhan Dan Kedalaman Relatif Perairan Di Waduk Sutami Kabupaten Malang

A Newly Developed Unmanned Aerial Vehicle (UAV) Imagery Based Technology for Field Measurement of Water Level

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