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Full-Text Articles in Entire DC Network
Estimation Of Maximum Scour Depth And Scour Pattern Around Submerged Spur-Dike, Manish Pandey, Manali Pal
Estimation Of Maximum Scour Depth And Scour Pattern Around Submerged Spur-Dike, Manish Pandey, Manali Pal
International Symposium on Hydraulic Structures
Scouring due to turbulent flows is a process that naturally happens around river structures, including river training or riverbank protection works such as spur dikes, submerged vanes, etc. present experimental study aims to estimate the maximum scour depth around submerged spur dikes, which have not been studied as extensively. In this study, we checked the influence of different flow conditions, spur dike dimensions and submergence conations on maximum scour depth at equilibrium scour conditions. The dependence of the criteria for scour initiation and scour patterns on the dike dimensions, such as the dike length and height, has been assessed. We …
Charlesville Musket With Bayonet, Bringing War Home
Charlesville Musket With Bayonet, Bringing War Home
Bringing War Home Collection
A Charleville Musket with Bayonet, produced in 1776, from the Revolutionary War. Crafted from wood and metal and in good condition but not functional. Participant ID_00048, Object ID_00125
Nose Plug For 280mm Cannon, Bringing War Home
Nose Plug For 280mm Cannon, Bringing War Home
Bringing War Home Collection
Mass-produced nose plug used to lift an "Atomic" cannon, artillery piece by crane, in good condition and made by the US military in the 1950's. Issued to the participant in 1956 in Germany and brought to Utah. Participant ID_00046, Object ID_00115.
Photograph Of The 280mm Cannon And Noel And Crew, Bringing War Home
Photograph Of The 280mm Cannon And Noel And Crew, Bringing War Home
Bringing War Home Collection
Professionally taken photograph of the participant, Noel, and his crew with a 280mm cannon in good condition. Taken in Germany in 1957. Participant ID_00046, Object ID_00116.
A Numerical Investigation On Residual Energy Of Labyrinth Weirs, P. Langohr, B. M. Crookston, D. B. Bung
A Numerical Investigation On Residual Energy Of Labyrinth Weirs, P. Langohr, B. M. Crookston, D. B. Bung
International Symposium on Hydraulic Structures
The replacement of existing classical weirs with labyrinth weirs is a proven techno-economical solution and a means to increase the discharge capacity when rehabilitating existing structures. However, flows exiting a labyrinth weir are complex, three-dimensional, and aerated; additional information is needed regarding energy dissipated by such weirs. In this study, three labyrinth weirs with different crest lengths were simulated with FLOW-3D HYDRO. Reynolds-averaged Navier-Stokes (RANS) modeling with the use of finite-volume method and Re-Normalisation Group (RNG) k-ε turbulence closure were employed. An attempt was made to more precisely account for the flow field in the downstream region. Consequently, the velocity …
Cfd-Based Modeling For Computing Discharge Coefficient Of An Ogee Spillway, Hariom Gautam, Zulfequar Ahmad, Pramod Kumar Sharma
Cfd-Based Modeling For Computing Discharge Coefficient Of An Ogee Spillway, Hariom Gautam, Zulfequar Ahmad, Pramod Kumar Sharma
International Symposium on Hydraulic Structures
The basic functionality of the spillway is to control the flow and safely convey the excess flow while keeping the structure stable. An ogee spillway is commonly used due to its high discharging capacity. The discharge coefficient of an ogee spillway is greatly affected by the ratio of an operating head and design head. Since physical models are expensive and have limitations in terms of scale effect, a comprehensive numerical simulation was performed in this study to estimate the discharge coefficient for an ogee spillway under various head ratios using CFD-based numerical modeling. The numerical simulations were done using FLOW-3D. …
Effect Of Sinuosity Variation On Flow Characteristics Of Sand Mined Sinuous Channel Using Numerical Modeling, O. P. Maurya, K. K. Nandi, S. Modalavalasa, S. Dutta
Effect Of Sinuosity Variation On Flow Characteristics Of Sand Mined Sinuous Channel Using Numerical Modeling, O. P. Maurya, K. K. Nandi, S. Modalavalasa, S. Dutta
International Symposium on Hydraulic Structures
Anthropogenic activities within the river corridor can have a long-term influence on river health if not managed effectively. Uncontrolled practices of sand mining, a common but aggressive activity can cause severe river bed degradation and, as a result, river incisions, lateral channel instability, and bed armoring. This can further affect the downstream structure such as the bridge pier as well as the morphology of the river. The purpose of this study is to examine, with the help of a numerical model, the impact of a mining pit on the downstream pier and the main channel hydrodynamics if it is present …
Estimation Of Discharging Capacity And Assessing The Performance Of Overflow Spillway With Full And Partial Operation Of Gates Using Numerical Modelling, Prajakta P. Gadge, Kunal Kapur
Estimation Of Discharging Capacity And Assessing The Performance Of Overflow Spillway With Full And Partial Operation Of Gates Using Numerical Modelling, Prajakta P. Gadge, Kunal Kapur
International Symposium on Hydraulic Structures
The spillway is among the most important structures of a dam project. The operation of spillway gates during the flood and fulfilling the downstream requirement is one of the main problems in reservoir management. Generally, the equal opening of all the gates during spillway operation is mostly preferred for maintaining an equal distribution of discharge in the energy dissipator and at the downstream side. A systematic study is required to determine the ability of the spillway to pass the discharge at various reservoir water levels through a specific opening of gates and assess the performance for the safety of the …
Numerical Simulation Of Air Entrainment In Stepped Spillways, F. Zabaleta, S. Márquez Damián, F. A. Bombardelli
Numerical Simulation Of Air Entrainment In Stepped Spillways, F. Zabaleta, S. Márquez Damián, F. A. Bombardelli
International Symposium on Hydraulic Structures
Existing methods to simulate air entrainment in stepped spillways are based on a sub-grid air-entrainment function that accounts for the incorporation of air through the air-water interface; a transport equation for the bubbly phase is then solved inside the water domain. Unfortunately, these techniques are unable to represent bulking, i.e., the increase in water depths after the inception point. In this work, we introduce a novel method for the simulation of flow in stepped spillways (including the aerated region). The new air-entrainment model is implemented in the OpenFOAM platform and couples an air-concentration-transport equation with the traditional Volume-of-Fluid (VoF) method …
Sph Simulation Of Non-Aerated Flow Over Smooth Invert, Converging Spillways, J. D. Nóbrega, J. Matos, H. E. Schulz, R. B. Canelas
Sph Simulation Of Non-Aerated Flow Over Smooth Invert, Converging Spillways, J. D. Nóbrega, J. Matos, H. E. Schulz, R. B. Canelas
International Symposium on Hydraulic Structures
Spillways may require converging sidewalls because of site or economy constraints. The adverse effects of the converging walls on supercritical flows include the formation of standing waves. In this context, numerical simulations were carried out using the Smoothed Particle Hydrodynamics (SPH) method. The numerical results were compared with experimental data acquired on a spillway model composed of a broad crested weir followed by a 1V:2H sloping chute with wall convergence angle of 9.9º or 19.3º, for a range of discharges. The flow depths at the spillway centerline were reasonably well predicted by the numerical simulations, except on the transition from …
Bank Scour Protection Using Spur Dyke In A Meandering Channel Under Low Flow Velocity, Nishank Agrawal, Ellora Padhi
Bank Scour Protection Using Spur Dyke In A Meandering Channel Under Low Flow Velocity, Nishank Agrawal, Ellora Padhi
International Symposium on Hydraulic Structures
In geophysical flows, the channel often starts to meander when it encounters a plan terrain. Owing to higher flow velocity, it tends to erode the channel boundary (bed and banks) that comes across its path. Scouring in a meandering channel primarily depends on channel boundary, flow condition, and sediment properties. To date, numerous works have been conducted to understand the velocity distribution and scouring pattern in a meandering channel under varying discharge conditions. However, only a handful of work has been reported on the scour pattern under low discharge conditions in a meandering channel. Therefore, in this paper, an experimental …
Numerical Modeling For Optimization Of The Aspect Ratio Of Submerged Vanes For The Purpose Of Sediment Deflection In Rivers, V. Chauhan, R. Chavan, G. D. Singhal
Numerical Modeling For Optimization Of The Aspect Ratio Of Submerged Vanes For The Purpose Of Sediment Deflection In Rivers, V. Chauhan, R. Chavan, G. D. Singhal
International Symposium on Hydraulic Structures
In order to create a secondary circulation (spiral flow) in the downstream direction to their trailing edge, submerged vanes are tiny aspect ratio (H/L) devices that are positioned vertically on riverbeds. Since this secondary circulation is driven by the vane-induced tip vortex, submerged vanes are best recognized for changing the alluvial river-bed profile. Finding the right aspect ratio as a function of the angle of attack with the approach flow is one of the current issues with using the submerged vane technique. In this context, the current study aims to investigate the best vane length to be used, based on …
Experimental Evaluation Of Drag Force On Different Shapes Of Pontoons At Different Water Stream Velocities At Specified Loads And Submergence, R. B. Deogade, H. R. Khandagale, M. Someshwara
Experimental Evaluation Of Drag Force On Different Shapes Of Pontoons At Different Water Stream Velocities At Specified Loads And Submergence, R. B. Deogade, H. R. Khandagale, M. Someshwara
International Symposium on Hydraulic Structures
The ability to cross both natural and man-made obstacles have always been crucial for good mobility and is vitally important for various operations. The series of Pontoons are used as floating bridge to allow the transport vehicles and personnel over water and marshy grounds. Floating bridges are cost-effective solutions for crossing large bodies of water with unusual depth. Friction drag is observed when relative motion exists between pontoon and fluid. In view of this drag force is required to be evaluated correctly so that arrangement to fix the pontoon can be accurately designed considering the load and safety factors. For …
Performance Testing Of Acoustic Doppler Current Profiler Used For Stream Flow Measurement, R. B. Deogade, H. R. Khandagale, M. Someshwara
Performance Testing Of Acoustic Doppler Current Profiler Used For Stream Flow Measurement, R. B. Deogade, H. R. Khandagale, M. Someshwara
International Symposium on Hydraulic Structures
As water demand is steadily increasing worldwide, it is very important to measure the discharge accurately for sustainable water resources management such as flood control, water distribution, hydraulic structures design, and hydro-environment management. Since decades the cup and propeller type current meters are used for the measurement of stream velocity, but due to emergent technology, Electromagnetic, Acoustic Doppler Current Profiler (ADCP), etc. are used for measuring the stream flows. These instruments have higher edge in accuracy, consistency, and reliability. Quantitative information on performance and validation in the field of discharge measurement is rare. Hence performance testing of such instrument is …
Experimental Optimization Of A Gravel Trap In A Gallery, S. Erpicum, N. Claude, B. Dewals, P. Archambeau, M. Pirotton
Experimental Optimization Of A Gravel Trap In A Gallery, S. Erpicum, N. Claude, B. Dewals, P. Archambeau, M. Pirotton
International Symposium on Hydraulic Structures
A partly unlined pressurized gallery supplies water to a hydropower plant. Since rocks and gravel may detach from the gallery walls, two gravel traps have been built on the gallery invert, downstream of the unlined sections. During gallery and powerplant inspections, it appears that the gravel traps are empty while gravel is found in the tail channel downstream of the turbines. Clear evidence of turbine damaging by solids impact is also observed. To understand why the gravel traps are ineffective and to define solutions to be implemented on site to increase their trapping efficiency, a 1:7.7 scale physical model of …
Investigation On Near Bed Flow Features Over A Water-Worked Gravel Bed, Ellora Padhi, Nishank Agrawal
Investigation On Near Bed Flow Features Over A Water-Worked Gravel Bed, Ellora Padhi, Nishank Agrawal
International Symposium on Hydraulic Structures
One of the key problems in the research on fluvial hydraulics is to correctly reproduce the flow dynamics over a riverbed in laboratory experiments. Generally, while performing experiments, attention is paid to specific hydraulic conditions related to the flow regime, sediment transport, and bed erosion. In this context, the sediment size of the riverbed to be analysed plays an important role. It is a common practice to create the bed manually using a screeded mixture of sediments with random orientation that could be very different from that observed in natural riverbeds. To overcome this issue, a manually created gravel bed …
Porous Concrete Slabs Underlain By Polypropylene Fabric For Restoration Of Beaches, N. N. Pillai, M. L. Kansal, R. Ramkrishnan
Porous Concrete Slabs Underlain By Polypropylene Fabric For Restoration Of Beaches, N. N. Pillai, M. L. Kansal, R. Ramkrishnan
International Symposium on Hydraulic Structures
Beaches in India and elsewhere are getting destroyed at an alarming rate as many small ports are being built and sea walls are coming up on the banks. There is an urgent need to stop it. In 1966, Posey used cylinders of net filled with rock (called rock sausages) underlain by a reverse gravel filter for safety against scour in hydraulic structures. Pillai used a bed of stones enclosed in nets underlain by a reverse filter to allow overflow over a sand embankment. Later it was understood that a Polypropylene Fabric (P.F.) could be effective as a filter, and a …
Reynolds Stress Modelling Of Supercritical Flow In A Narrow Channel, S. Kadia, N. Rüther, E. Pummer
Reynolds Stress Modelling Of Supercritical Flow In A Narrow Channel, S. Kadia, N. Rüther, E. Pummer
International Symposium on Hydraulic Structures
One of the most effective techniques to combat reservoir sedimentation, especially for small to medium-sized reservoirs, is the installation of Sediment Bypass Tunnels (SBTs). SBTs are designed for supercritical narrow open channel flow conditions. In such narrow channels, the walls and the free surface boundaries can influence the flow characteristics and form secondary currents. These vortex structures can alter the longitudinal velocity distribution and form velocity dip. Besides, they can also alter the bed shear stress distribution and influence the sediment transport. Such complex phenomenon can be modelled using Reynolds Stress Models (RSMs). In this study, the full Launder Reece …
Designing Smooth Mixed-Geometry Canal Transition, D. C. Froehlich
Designing Smooth Mixed-Geometry Canal Transition, D. C. Froehlich
International Symposium on Hydraulic Structures
When a canal’s size or shape changes, usually over a short distance, a section of the channel, known as a transition structure, is needed to connect the waterway’s two stretches. Fifth-degree parametric equations are developed to calculate the cross-section dimensions and bed centerline elevations (thus, the geometric surface coordinates) between the two ends of a warped transition structure in a water-supply canal. The parametric modeling approach provides a smooth representation of the mixed geometry that results from terminal sections having vastly different shapes. A generalized cross-section defined by four parameters enables a straightforward model of various forms ranging from trapezoids …
Importance Of Risk And Hazard Assessment Of River Projects In India, Jitesh N. Vyas, Supriya Nath, R. B. Deogade
Importance Of Risk And Hazard Assessment Of River Projects In India, Jitesh N. Vyas, Supriya Nath, R. B. Deogade
International Symposium on Hydraulic Structures
Rivers are the lifeline for every country as they provide water for proliferation, sustenance and propagation of life since time immemorial. With increasing population pressure, water demand increased for drinking, irrigation, and industrial consumption. This water deficit required utilization of available water resources in the best possible manner through various hydrological projects like construction of dams, weirs, barrage, etc. There is a disparity in water availability between north and south India as most of the perennial rivers are situated in the north while seasonal rivers in south India. To resolve this disproportionate distribution and to maintain the balance of water …
Model Studies For Desilting Basin For Teesta-Vi H.E. Project, Sikkim – A Case Study, M. Z. Qamar, M. K. Verma, A. P. Meshram, Neena Isaac
Model Studies For Desilting Basin For Teesta-Vi H.E. Project, Sikkim – A Case Study, M. Z. Qamar, M. K. Verma, A. P. Meshram, Neena Isaac
International Symposium on Hydraulic Structures
Desilting basins play an important role in run-of-river hydro power projects on Himalayan Rivers. These rivers carry huge amount of sediment with them, due to steep slopes and fragile geology of the region. The suspended sediment enters through the power intake and ultimately the power house. This causes heavy damage to the turbines and other under water parts. Therefore, desilting basins are provided to eliminate suspended sediment from the water conductor system. The design of desilting basin is verified on a physical model for 90% removal of suspended sediment coarser than 0.2 or 0.3 mm and efficacy of flushing tunnel …
Stilling Basins Using Wedge-Shaped Baffle Blocks, N. N. Pillai, M. L. Kansal
Stilling Basins Using Wedge-Shaped Baffle Blocks, N. N. Pillai, M. L. Kansal
International Symposium on Hydraulic Structures
The United States Bureau of Reclamation (USBR) extensively studied hydraulic jump-type stilling basins for various inflow and tailwater conditions. They recommend Basin III using chute blocks, rectangular baffle blocks, and sloping end sill for medium to high dams. However, a significant contribution to the knowledge regarding the production of turbulence in discontinuity layers, the dissipation of energy, the convection, and the decay of turbulence in hydraulic jump was made by subsequent researchers. However, while developing the stilling basin, the wake formed by the jets separating at the front corners of the rectangular baffle blocks in Basin III and reattaching the …
Feasibility Assessment Of The Application Of Delft3d Model To Simulate Flow Over A Spillway In A Dam: Study Case Of Hampaturi Dam In Bolivia, F. D. Oliveira, M. W. Heredia
Feasibility Assessment Of The Application Of Delft3d Model To Simulate Flow Over A Spillway In A Dam: Study Case Of Hampaturi Dam In Bolivia, F. D. Oliveira, M. W. Heredia
International Symposium on Hydraulic Structures
Numerical modelling is an attractive alternative over physical modelling. However, sometimes both kind of techniques are coupled. This is the case of Hampaturi Dam in La Paz, Bolivia. A physical model was built for the optimization of the spillway. Hence, a numerical model was implemented with Delft3D computational model. Delft3D is a model based on two-dimensional flow equations (hydrostatic equations), and full three-dimensional equations (hydrostatic equations). Both modes were tested for the flow over the spillway, which includes a steep discharge channel that poses an additional difficulty. The goal of this research is to test the model (in both modes) …
Prediction Of Discharge Coefficient Of Circular Side Orifice Through Machine Learning Technique, Syed Ahmed Noman, Ajmal Hussain, Mohd. Danish, Rashid Ali
Prediction Of Discharge Coefficient Of Circular Side Orifice Through Machine Learning Technique, Syed Ahmed Noman, Ajmal Hussain, Mohd. Danish, Rashid Ali
International Symposium on Hydraulic Structures
A sharp-crested circular side orifice is a crucial element when it comes to diverting flow from primary source to its subordinate source. Such a flow measurement instrument technique is of immense value in conservation and evaluation of drainage and irrigation networks. Usually, it is placed towards the side of a channel in order to regulate the flow of the fluid. Traditionally, coefficient of discharge was predicted through regression methods which are time-consuming and lack accuracy. Artificial Intelligence (AI) and its applications in this domain have bridged this gap by providing novel alternative methods which prove much more efficient. Repeated studies …
Anti Vortex Device To Operate Pump Intakes Below The Minimum Submergence, M. A. Angulo, A. Rivetti, C. V. Lucino, S. O. Liscia
Anti Vortex Device To Operate Pump Intakes Below The Minimum Submergence, M. A. Angulo, A. Rivetti, C. V. Lucino, S. O. Liscia
International Symposium on Hydraulic Structures
Thermal power plants require water cooling pump stations to inject fresh water into the condenser. Generally, these pump stations have vertical mixed-flow pumps with large flows and low-to-medium heads that take water from rivers or reservoirs. Under certain natural conditions, water sources can reach extraordinarily low levels, thus affecting pump operation as the minimum recommended submergence might not be met, causing the power plant to be powered off. This causes both a very high loss of profit for the company and a decrease in the available power for the electrical supply system. Therefore, expanding the range of submergence under which …
Hydrodynamic Behavior Of Stilling Basins With Deflectors To Reduce Supersaturation Of Total Dissolved Gases: Analysis Of Yacyretá And Jorge Cepernic Dams, C. A. Fattor, J. D. Bacchiega, F. Romero, C. Fernández
Hydrodynamic Behavior Of Stilling Basins With Deflectors To Reduce Supersaturation Of Total Dissolved Gases: Analysis Of Yacyretá And Jorge Cepernic Dams, C. A. Fattor, J. D. Bacchiega, F. Romero, C. Fernández
International Symposium on Hydraulic Structures
High air entrainment to the hydraulic jump is one of the inherent aspects of this macroturbulent flow, extending its presence from the free surface to the bottom. Depending on the variety of fishes in this natural habitat, important values of supersaturation of total dissolved gases (TDG) could be reached immediately downstream of the energy dissipation structure, putting under risk the life of fishes. This article deals with the influence of deflectors designed to reduce TDG on the hydrodynamic behavior of energy dissipators of two important dams. The first one is Yacyretá dam (Paraná River, Argentina – Paraguay) where horizontal deflectors …
Numerical And Experimental Study On Energy Dissipation In Hydraulic Jump: A Comparison Between Horizontal And Sloping Rough Channel Bed, Koroungamba Laishram, Thiyam Tamphasana Devi, Ngangbam Romeji Singh, Potsangbam Albino Kumar
Numerical And Experimental Study On Energy Dissipation In Hydraulic Jump: A Comparison Between Horizontal And Sloping Rough Channel Bed, Koroungamba Laishram, Thiyam Tamphasana Devi, Ngangbam Romeji Singh, Potsangbam Albino Kumar
International Symposium on Hydraulic Structures
Hydraulic jumps are used as an energy dissipater, allowing excess energy from downstream flow to be dissipated through hydraulic structures, preventing scouring. Channel roughness is also necessary for good flow control, as it allows more excess energy to be dissipated downstream. To better understand the impact of channel roughness on dissipating energy in an open channel, this study investigates and compares the energy dissipation of hydraulic jumps based on roughened (gravel size 20mm) horizontal and sloping channel bed condition. The experiment was carried out in the Hydraulics Laboratory, Department of Civil Engineering, NIT Manipur (India) in a rectangular channel flume …
Investigation Of Energy Attenuation, Flow Resistance And Impending Motion Of Downstream Bed Material In Rock Ramps, Vishal Singh Rawat, Thendiyath Roshni, Michele Palermo, Simone Pagliara, Deep Roy
Investigation Of Energy Attenuation, Flow Resistance And Impending Motion Of Downstream Bed Material In Rock Ramps, Vishal Singh Rawat, Thendiyath Roshni, Michele Palermo, Simone Pagliara, Deep Roy
International Symposium on Hydraulic Structures
Block ramps are ecofriendly drop structures, which ensure stable downstream river bed, peculiar to flows over macro roughness elements. It uniquely serves an essential paradigm in riverine management, to encounter deliveries in an ecologically sound manner. It permits safe fish passage, stabilizes stream banks and bed profiles and creates habitat diversity. Study of flows over block ramps are quite extensive and are associated with many intricacies. In this paper, flume experiments were conducted in the hydraulic laboratory of National Institute of Technology Patna. The particle densimetric Froude number (F*) was calculated for the mobile bed and chosen to predict the …
Energy Dissipation And Flow Regime Downstream Of Trapezoidal Piano Key Weirs, X. Shen, M. Oertel
Energy Dissipation And Flow Regime Downstream Of Trapezoidal Piano Key Weirs, X. Shen, M. Oertel
International Symposium on Hydraulic Structures
In the past two decades, increasing numbers of piano key weirs (PKW) have been constructed due to their sufficient hydraulic performance and optimized space requirements. Extensive experiments and numerical studies have been carried out to identify the optimal geometry and maximize the discharge capacity. However, less attention has been paid to address energy dissipation processes and the flow structure downstream, especially for in-channel applications. Within the present study, symmetrical trapezoidal piano key weir models were fabricated in two model sizes with different cycle numbers via a 3D printing technique. Both models were tested under equivalent hydraulic conditions to investigate the …
Effect Of Deficient Tailwater On The Performance Of Slotted Roller Bucket Of Indira Sagar Dam, Madhya Pradesh, Vankayalapati S. Ramarao, Amit Kulhare
Effect Of Deficient Tailwater On The Performance Of Slotted Roller Bucket Of Indira Sagar Dam, Madhya Pradesh, Vankayalapati S. Ramarao, Amit Kulhare
International Symposium on Hydraulic Structures
Slotted roller bucket type energy dissipators are provided for spillways when the tailwater depth is 1.2 times the sequent depth required for the formation of a hydraulic jump. In slotted roller buckets, the dissipation of energy occurs by the lateral spreading of jet passing through bucket slots in addition to the formation of two complementary rollers as in the solid bucket. These are provided for spillways where the downstream river bed is of sound rock. However, when the tailwater levels are not realised during the release of floods over the spillway and surface and ground rollers are not formed, it …