Effects of Geometry and Hydraulic Characteristics of Shallow Reservoirs on Sediment Entrapment

Zahabi, Hamidreza; Torabi, Mohammadamin; Alamatian, Ebrahim; Bahiraei, Mehdi; Goodarzi, Marjan

doi:10.3390/w10121725

Cited by 44 publications

(23 citation statements)

References 29 publications

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“…The specific values obtained for probes 1 and 2 were as highlighted in Table 2. From the table, the experimental results were found to strongly agree with the numerical values with percentage error less than 5% in both parameters as highlighted, which is acceptable according to [30]. The difference may be due to mesh quality variation from the numerical results.…”

Section: Numerical Model Validationmentioning

confidence: 52%

Modelling of Flow Parameters through Subsurface Drainage Modules for Application in BIOECODS

Abdurrasheed

Yusof

Al‐Qadami

et al. 2019

Water

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The flow resistance of the existing modules in the bio-ecological drainage system (BIOECODS) is high and may lead to flood instead of its mitigation. As part of efforts to enhance the performance of the system, the river engineering and urban drainage research center (REDAC) module was developed. This study modelled the hydrodynamics of flow through this module using FLOW-3D and laboratory experiments for two cases of free flow without module (FFWM) and flow with a module (FWM) to understand and visualize the effects of the module. With less than 5% error between the numerical and experimental results, REDAC module altered the flow pattern and created resistance by increasing the Manning's roughness coefficient at the upstream, depth-averaged flow velocity (43.50 cm/s to about 46.50 cm/s) at the downstream and decreasing water depth (7.75-6.50 cm). These variations can be attributed to the complex nature of the module pattern with further increase across the porous openings. Therefore, the technique used herein can be applied to characterize the behavior of fluids in larger arrangments of modules and under different flow conditions without the need for expensive laboratory experiments.

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Section: Numerical Model Validationmentioning

confidence: 52%

Modelling of Flow Parameters through Subsurface Drainage Modules for Application in BIOECODS

Abdurrasheed

Yusof

Al‐Qadami

et al. 2019

Water

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“…The simulation was completed in a sufficient duration to ensure steady conditions were achieved, and then, the comparison was made. This method is similar to that of (Zahabi et al 2018):…”

Section: Verification Of Numerical Model and Laboratory Resultsmentioning

confidence: 99%

Investigation of trapezoidal sharp-crested side weir discharge coefficients under subcritical flow regimes using CFD

et al. 2019

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Side weirs are utilized to regulate water surface and to control discharge and water elevation in rivers and channels. Here, the discharge coefficient for trapezoidal sharp-crested side weirs (TSCSW) and their affecting parameters are numerically investigated. To simulate the hydraulic and geometric characteristics of TSCSWs, three weir crest lengths of 15 cm, 20 cm and 30 cm with lengths of 20 cm, 30 cm and 40 cm and with two different sidewall slopes are utilized. The results show that for constant P/B (P: weir height, B: main channel width), the depth of flow along the channel and weir decreases as the crest length increases. Also, with increasing P/y 1 ratio (P: weir height, y 1 : upstream flow depth), the discharge coefficient decreases for small crest lengths and increases for large crest lengths. The results show that for constant T/L ratio (T: passing flow width, L: side weir crest length), increasing the length, height and sidewall slope of a side weir will increase the discharge coefficient. It is observed that as the upstream Froude number increases for side weirs with longer crest lengths, the intensity of deviating flow and kinetic energy over the TSCSW will increase. Finally, some relations with high correlation factors are proposed for obtaining discharge coefficients using the dimensionless parameters of P/y 1 , T/L and Fr 1 . Based on proposed relations and sensitivity analysis, it is shown that T/L and P/y 1 are the most effective parameters for reducing the discharge coefficient reduction.

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“…As there are no outstanding differences between the results obtained with the smaller mesh size, the 2.5 mm mesh size is used to analyze the rest of the models (based on run-time considrations). The grid convergence method for selecting mesh sizes is used and inspiered by Zahani et al and Zeidi et al [21,[27][28][29].…”

Section: Mesh Sizementioning

confidence: 99%

Numerical Study of Sediment Flow Over Bottom Intake Racks With Flow-3D

Shahri

Khoshnevis

Bina

et al. 2019

int.jour.sci.res.mana.

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Bottom intakes are the most useful structure for diverting the flow of steep rivers and providing specific amount of water for hydropower usage. It is crucial to obtain optimum of physical parameters in order to divert desired discharge with minimum possibility of occlusion. Numerical models can simulate flow and turbulence transport equations at any complex geometries. Numerical methods based on Computational Fluid Dynamics (CFD), are one of the most common methods of numerical simulation that is used in water structures. According to the capabilities of numerical methods, complex modes of flow field over bottom intakes can be analyzed. In the present study, Flow-3D software is used to investigate the experimental results of the previous researcher for sediment and clean water flow over bottom intake with circular bars numerically. This study is carried out in a total of 27 models for clean water and 9 models of sediment flow (Bed-Load) at different approaching flow conditions. Parameters of roughness, size of computational cell, turbulence transport equation, Bed Load Transport equation and bed load coefficient has been calibrated. Validation procedure proved that the accuracy and performance of numerical models appear to be acceptable for designing intake systems. For each test, the discharge coefficient is computed, then by using dimensional analysis, a dimensionless relation derived from the dependent and independent variables and compared with the measured discharge coefficient. Estimating the discharge coefficient by the proposed equation in clean water flow performed a mean error of 6.4 percent and for sediment flow led to a mean error of 4.3 percent.

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Effects of Geometry and Hydraulic Characteristics of Shallow Reservoirs on Sediment Entrapment

Cited by 44 publications

References 29 publications

Modelling of Flow Parameters through Subsurface Drainage Modules for Application in BIOECODS

Modelling of Flow Parameters through Subsurface Drainage Modules for Application in BIOECODS

Investigation of trapezoidal sharp-crested side weir discharge coefficients under subcritical flow regimes using CFD

Numerical Study of Sediment Flow Over Bottom Intake Racks With Flow-3D

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