Development of Stilling Basin Model at Zero Depth of Pipe Outlet to Basin Floor: An Advanced Research

2021 ◽  
pp. 21-29
Author(s):  
H. L. Tiwari ◽  
M. S. Hora
Keyword(s):  
Stilling Basin ◽  
Basin Floor ◽  
Pipe Outlet

Design of stilling basin for circular pipe outlets

2008 ◽  
Vol 35 (12) ◽  
pp. 1365-1374 ◽  
Author(s):  
Arun Goel
Keyword(s):  
Experimental Work ◽  
Circular Pipe ◽  
Stilling Basin ◽  
Basin Floor ◽  
Pipe Outlet

Experimental work leading to the design of a stilling basin for pipe outlets is reported in this paper. The stilling basin designed on the basis of present study has been compared with the stilling basin design proposed by Garde et al. in 1986. The experiments were performed by taking two pipe outlets of 10 and 7.5 cm diameter and varying inflow Froude numbers. In the present study, the new design is arrived at by conducting a systematic experimentation on the various stilling basin models and keeping the basin floor at the invert level of the pipe outlet. The location as well as the arrangements of appurtenances, such as a wedge-shaped splitter block, modified grid, row of wedge-shaped baffle blocks, and end sill, were also varied in the experiments. A nondimensional number has been defined to compare the performance of the stilling basin models on the basis of developed scour downstream of the basin. The performance of the proposed stilling basin (model M-71) is much better as compared with that of the stilling basin G-D* proposed by Garde et al. in 1986.

scholarly journals AN EXPERIMENTAL AND NUMERICAL STUDY OF FACTORS INFLUENCING THE SCOUR DUE TO THE COLLISION OF WATER JET IN STILLING BASIN FLOOR

2019 ◽  
Vol 10 (2) ◽  
pp. 42-59
Author(s):  
Fadhil Al- Mohammed ◽  
◽  
Ali Jassim ◽  
Hamid Abbas ◽  
◽  
...  
Keyword(s):  
Numerical Study ◽  
Water Jet ◽  
Stilling Basin ◽  
Factors Influencing ◽  
Basin Floor

Hydraulic design for the two-stage stilling basin

1981 ◽  
Vol 8 (2) ◽  
pp. 137-145
Author(s):  
C. D. Smith ◽  
M. J. Klassen
Keyword(s):  
Three Dimensional ◽  
Design Criterion ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Two Stage ◽  
Stilling Basin ◽  
Hydraulic Design ◽  
In Series ◽  
Basin Floor ◽  
High Head

The two-stage stilling basin is a design sometimes used for high head energy dissipating structures. The distinguishing feature of the design is that essentially two hydraulic jumps occur in series in the same structure. The tailwater depth for the first jump is created by a fixed weir. Tailwater for the second jump is due to the natural tailwater available in the downstream channel. Since most of the energy of flow is dissipated in the first jump, the required tailwater depth to produce a jump in the second basin is considerably decreased, with the result that the entire stilling basin floor may be placed at a higher elevation than for a single basin. This can be advantageous in certain situations.In this paper the results of hydraulic model tests for a two-stage stilling basin are reported. The characteristics of the basin first were studied two-dimensionally using a parallel sided flume. A design criterion was established and this was subsequently verified on a three-dimensional model.

Application and Comparsion of Mathematical and Physical Models on Inspecting Slab of Stilling Basin Floor under Static and Dynamic Forces

2011 ◽  
Vol 147 ◽  
pp. 283-287 ◽  
Author(s):  
Behzad Mohammadzadeh ◽  
Mahmoud Bina ◽  
Hooshang Hasounizadeh
Keyword(s):  
Hydraulic Jump ◽  
Physical Models ◽  
Stress And Strain ◽  
Floor Slab ◽  
Stilling Basin ◽  
Dynamic Forces ◽  
Basin Floor ◽  
Energy Dissipated ◽  
Physical And Mathematical Models ◽  
Resultant Forces

To protect downstream of hydraulic structures against erosion and degradation, must dipress water energy. one of the most comon methods to achive this purpose is constructing the stilling basin at the downstream of such structures. In stilling basin, the water energy dissipated by taking place of hydraulic jump. When a hydraulic jump occurs, the hydrodynamic and hydrostatic forces effect on the stilling basin floor slab. These forces include the force due to water weight and the up lift force affected the slab below which these forces are classified in hydrostatic. also the other force is hydrodynamic force due to pressure fluctions below the hydraulic jump. To keep the stilling basin stabillity from liffting up and destruction must the resistant forces be equal to destroyer forces. In this study after discution about the hydraulic jump and its resultant forces, a equation has been offerd to determine the thickness of stilling basin floor slab using buckingham theory andsoftware DATAFIT. Finaly the slab which evaluated by physical model, simulated using mathematical model(software ANSYS 10) and studied. The stress and strain diagrams were extracted. Results showed that physical and mathematical models were matched very good.

EXPERIMENTAL STUDY OF STILLING BASIN MODELS

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Hari Lal Tiwari ◽  
Kamal Singh
Keyword(s):  
Hydraulic Structure ◽  
Base Material ◽  
Model Design ◽  
Flow Conditions ◽  
Number Range ◽  
Stilling Basin ◽  
New Models ◽  
Stilling Basins ◽  
Sand Base ◽  
Pipe Outlet

Stilling basins with appurtenances can be used effectively in dissipating the excessive energy downstream of hydraulic structure like spillway, sluices, pipe outlets etc. Experimental investigation leading to the development of new stilling basin model design for pipe outlet with different appurtenances is reported in this paper. On the basis of present study, newly stilling basin design has been compared with USBR VI model. The new models were tested in a rectangular shaped pipe outlet for three Froude numbers, namely Fr = 1.85, 2.85, and 3.85 in comparison to USBR VI stilling basin model recommended for the pipe outlets. The scour pattern was measured for each test run and flow pattern was also observed. The performance of the basin was compared by Performance number (PN) as criteria to evaluate the performance of model, using same sand base material and test run time for all the tested models. After test runs, it is found that, for a given Froude number range, the performance of new stilling basin model is improved and also the length of the newly developed basin is reduced as compared to USBR VI stilling basin for a given flow conditions.

scholarly journals Investigation Of Hydraulic Flow Characteristics On Drop Structures

2021 ◽  
Vol 930 (1) ◽  
pp. 012028
Author(s):  
V Dermawan ◽  
D R Dermawan ◽  
M J Ismoyo ◽  
P H Wicaksono
Keyword(s):  
Flow Behavior ◽  
Flow Characteristics ◽  
Ground Level ◽  
Flow Depth ◽  
Stilling Basin ◽  
Flow Parameters ◽  
Jump Length ◽  
Gradient Channel ◽  
Basin Floor ◽  
Free Falling

Abstract Drop structures are required if the slope of the ground level is steeper than the maximum allowable gradient channel. Drop structures become bigger as height increases. Its hydraulic capability may be reduced due to variations of jets falling on the stilling basin floor due to discharge changing. Drop structures should not be used if the change in energy level exceeds 1.50 m. The free-falling overflow on drop structures will hit the stilling basin and move downstream. As a result of overflows and turbulence in the pool below the nappe, some energy is dissipated at the front. The rest of the energy will be reduced downstream. The objectives of this study are to investigate the hydraulics flow behavior in straight and sloping drop structures and to investigate hydraulics flow behavior in a single and serial vertical drop (stepped drop). The hydraulic model results of single and stepped drop structures are compared to obtain flow behavior and energy dissipation information. The comparisons are specific to the flow parameters, including flow depth at the drop structures toe, flow depth after the jump, and hydraulic jump length.

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