Article
Engineering, Mechanical
Amin Seyedzadeh, Mehdi Yasi, Javad Farhoudi
Summary: Vertical sluice gates are commonly used in irrigation and drainage networks. By conducting experiments with laboratory models, it was found that installing the gate at a specific distance from the upstream end of the weir crest and having a specific height for the weir can optimize the flow characteristics. The developed relationships for contraction, head-loss, and discharge coefficients provided accurate estimations for the performance of the gated weir.
FLOW MEASUREMENT AND INSTRUMENTATION
(2023)
Article
Engineering, Civil
Farzin Salmasi, John Abraham
Summary: This study investigates the effect of different sill shapes on the discharge coefficient C-d under a vertical sluice gate. Results show that circular sills can increase C-d, with the highest values observed in a 3 cm diameter circular sill. Sill height and shape significantly impact C-d, while the most influential parameters are H-1/p and Z/G.
JOURNAL OF HYDROLOGY
(2021)
Article
Environmental Sciences
Behzad Shakouri, Imren Ismail, Mir Jafar Sadegh Safari
Summary: In this study, a new method for determining the flow discharge of vertical sluice gates is proposed using energy-momentum equations to characterize the physical expression of the phenomena. The coefficient of discharge, contraction coefficient, and energy loss coefficient are calculated using an optimization approach. Regression equations for quantifying the energy loss coefficient are produced using symbolic regression method. The derived formulas are used to compute the discharge coefficient and flow discharge of the vertical sluice gate.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Water Resources
Luca Cozzolino, Giada Varra, Luigi Cimorelli, Renata Della Morte
Summary: In this paper, the mathematical and numerical modeling of rapid transients at partially lifted sluice gates in the context of one-dimensional shallow water equations is studied. Improved exact solutions and a finite volume numerical model are presented. The results show that the relaxed version of gate equations provides satisfactory simulations in agreement with both the novel exact solutions and the laboratory dam-break results.
ADVANCES IN WATER RESOURCES
(2023)
Article
Engineering, Civil
Ruidi Bai, Maolin Zhou, Zhou Yan, Jianmin Zhang, Hang Wang
Summary: This technical note quantitatively assesses the effects of crest vegetation roughness on flow estimation by conducting experiments on finite-crest-length weirs covered with artificial vegetation. The study evaluates the effects of the vegetation canopy's equivalent roughness height on the weir discharge capacity and the variations in flow rate and weir crest length. Empirical equations are proposed to predict the discharge coefficient and correct flow estimates, taking into account the resistance effects of vegetation. The results contribute to improving the accuracy of hydrological modeling and flood forecasting, although vegetation degradation during floods is not considered.
JOURNAL OF HYDROLOGY
(2023)
Article
Environmental Sciences
Jianwei Zhang, Bingpeng Wang, Qi Jiang, Ge Hou, Zhirui Li, Hongze Liu
Summary: This paper investigates the fluid-solid interaction problem involving structural movement and deformation. It proposes an SPH interaction method to establish a numerical fluid-solid model. The method demonstrates good accuracy by comparing with experimental results.
Article
Physics, Fluids & Plasmas
Rasoul Daneshfaraz, Reza Norouzi, Hamidreza Abbaszadeh, Alban Kuriqi, Silvia Di Francesco
Summary: This study investigates the effects of sills with different geometric specifications at various positions on the hydraulic characteristics of flow through sluice gates experimentally and numerically. The simulation results showed that the RNG turbulence model is more accurate compared to other turbulence models. The discharge coefficient is influenced by factors such as gate opening, sill state, and sill thickness.
Article
Green & Sustainable Science & Technology
Meysam Nouri, Parveen Sihag, Ozgur Kisi, Mohammad Hemmati, Shamsuddin Shahid, Rana Muhammad Adnan
Summary: This study evaluated the discharge coefficient of a combined compound rectangular broad-crested-weir (BCW) gate using the computational fluid dynamics (CFD) modeling approach and soft computing models. Six data-driven procedures were used to estimate the coefficient of discharge (C-dt) of the weir gates, and the SVM model showed the highest accuracy in prediction. The multimode ANN model was found to be the most suitable for predicting the C-dt of a BCW gate, with minimum root mean square error (RMSE) and maximum correlation.
Article
Optics
Vladislav V. Serov, Joshua Cesca, Anatoli S. Kheifets
Summary: In this study, we systematically theoretically investigate strong field tunneling ionization of noble-gas atoms from He to Kr using elliptically polarized laser pulses in the attoclock setup. Our results suggest that the attoclock offset angle is entirely attributed to the Coulomb field of the ion remainder.
Article
Green & Sustainable Science & Technology
J. W. Kim, S. -B. Woo
Summary: This study presents a three-dimensional simulation method for tidal power generation, which accurately models the water exchange rate and flow conditions. The reliability and applicability of the model are demonstrated through experimental validation and comparison with observation data. Furthermore, the importance of high-resolution 3D modeling technology in understanding the complex flow structure around tidal power plants is emphasized.
Article
Construction & Building Technology
D. Frank, Narsing K. Jha, F. G. H. Koene, R. E. J. Kemp, A. Twerda, P. F. Linden
Summary: The primary objective of this study is to validate the use of waterbath experiments as a tool to assess the performance of an air curtain. The results showed that the effectiveness curves obtained from waterbath experiments, real-scale measurements, and numerical simulations exhibit similar trends, with minor differences. The study also confirmed the accuracy of the previously developed theoretical models for specific scenarios.
ENERGY AND BUILDINGS
(2022)
Article
Engineering, Marine
Ada Yilmaz, Selahattin Kocaman, Mustafa Demirci
Summary: This paper introduces a newly-designed experimental setup to study the interaction between an elastic sluice gate and a dam-break flow, the phenomenon was analyzed through experimental measurements and numerical modeling.
Article
Engineering, Multidisciplinary
Alsayed Diwedar, Lamia Mamdouh, M. M. Ibrahim
Summary: The current research experimentally investigates the flow passing through a combined hydraulic structure consisting of a V-notch sharp crested weir and inverted V-shaped sharp gate. The study explores the influence of the structure geometry, upstream head, and tailwater depth on the conveyed flow, discharge coefficient, and downstream flow pattern. The results show that the combined structure can convey a higher discharge with less downstream water disturbance compared to traditional structures. The gate angle has a greater influence on the conveyed flow, while the weir angle affects the downstream flow characteristics more significantly.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Arash Yoosefdoost, William David Lubitz
Summary: Sluice gates are hydraulic structures commonly used in regulating flow in open channels. This study compares different models in distinguishing flow regimes, estimating discharge coefficient, and analyzing flow rate. The study proposes new equations and methods to improve the accuracy of the models. The findings have important implications for the design and calibration of sluice gates and controlling flow in open channels.
Article
Environmental Sciences
Forough Alizadeh Sanami, Amir Ghaderi, Fardin Alizadeh Sanami, Parisa Mirkhorli, Silvia Di Francesco
Summary: This study investigated the flow regime, stage-discharge relationship, and discharge coefficient of A-type triangular piano key weirs (TPKW) in straight channels. The results showed that TPKW can pass a higher discharge compared to linear key weirs due to their longer length. Increasing the weir height from 0.07 m to 0.15 m decreased the discharge coefficient by approximately 20%. The h/Le dimensionless ratio was found to be the most influential parameter for the tested TPKW models.
Article
Engineering, Civil
Agostino Lauria, Giancarlo Alfonsi
JOURNAL OF HYDRAULIC ENGINEERING
(2020)
Article
Environmental Sciences
Carmine Fallico, Agostino Lauria, Francesco Aristodemo
Review
Environmental Sciences
Antonino D'Ippolito, Francesco Calomino, Giancarlo Alfonsi, Agostino Lauria
Summary: This paper explores the impact of vegetation on water energy losses in riverbanks and flood areas, with computational models incorporating resistance coefficients and roughness evaluations. It reviews classical approaches and recent advancements in analytical methods for both rigid and flexible vegetation, highlighting drag coefficients and resistance laws. The study also briefly discusses the use of 3D numerical methods for assessing turbulence characteristics and the transport of sediments and pollutants, as well as the application of remote sensing for mapping riparian vegetation.
Article
Mechanics
D. Ferraro, A. Lauria, N. Penna, R. Gaudio
Summary: This study investigated the combined effects of ship propeller jet and uniform flow on a mobile bed, finding that the still water condition can impact the scour induced by the propeller jet. Experimental and numerical results showed that under different water discharges and propeller submergence depths, the bed topography exhibited varying alterations.
Article
Water Resources
Antonino D'Ippolito, Francesco Calomino, Giancarlo Alfonsi, Agostino Lauria
Summary: Along riverbanks, trees and bushes are often planted in a single line. The drag coefficient of the tree trunks can be estimated using various methods, and equations proposed in scientific literature are used to simplify the estimation. This study validates the accuracy of these equations by comparing them with experimental data obtained from in-line cylinders.
INTERNATIONAL JOURNAL OF RIVER BASIN MANAGEMENT
(2023)
Article
Environmental Sciences
Nadia Penna, Francesco Coscarella, Antonino D'Ippolito, Roberto Gaudio
Summary: Flume experiments were conducted to investigate the impact of streambed instability in channels with randomly-distributed vegetation under varying vegetation density and flow conditions. The presence of vegetation was found to enhance the stability of the streambed and promote the formation of multiple bars. The bed morphology changed with both vegetation density and flow conditions, and exhibited both monofractality and multifractality.
ENVIRONMENTAL FLUID MECHANICS
(2022)
Article
Chemistry, Multidisciplinary
Antonino D'Ippolito, Francesco Calomino, Nadia Penna, Subhasish Dey, Roberto Gaudio
Summary: Even though fluid mechanics and numerical studies have made progress, experimental knowledge remains important for studying flow resistance in complex environments. This paper presents the results of experiments and simulations on the drag coefficients in open channels with emergent rigid vegetation. A regression equation was proposed to estimate the drag coefficients based on non-dimensional parameters, and it showed good results for different flow profiles.
APPLIED SCIENCES-BASEL
(2022)
Article
Mechanics
D. Ferraro, A. Lauria, N. Penna, R. Gaudio
Summary: This paper investigates the effects of flow intensity on ship propeller jet scouring in ship maneuvering areas, waterways path, and mooring in navigation channels. An experimental campaign was conducted to explore the flow intensity effects on the propeller jet and related scour. The experimental results are presented in terms of scoured bed profiles and proposed empirical equations for computing the main scour hole dimensions. Additionally, numerical simulations were performed to analyze the influence of flow intensity on the evolution of the scour hole and the boundary effect on the flow field.
Review
Environmental Sciences
Antonino D'Ippolito, Valeria Lupiano, Valeria Rago, Oreste G. Terranova, Giulio Iovine
Summary: Landslides are a major concern due to the fatalities, damages, and economic losses they cause, often triggered by rainfall. This paper reviews the two main approaches, physical and hydrological, for modeling the relationships between rainfall characteristics and landslide events. Real application cases from Southern Italy are presented, highlighting the strengths and weaknesses of each method and discussing potential research perspectives and their use in early warning systems.
Review
Environmental Sciences
Antonino D'Ippolito, Francesco Calomino, Subhasish Dey, Roberto Gaudio, Nadia Penna
Summary: Vegetation in water streams, banks, and floodplain areas has a significant impact on river hydraulics, affecting hydrodynamics, sediment transport, bedforms, and pollutant transport. Previous studies mainly focused on quantifying flow resistance due to vegetation, but recent research has also examined the effects on sediment transport. This paper reviews recent works on the effect of vegetation on incipient sediment motion and bedload transport, discussing various methods for estimation and providing indications for further research and development.
ENVIRONMENTAL FLUID MECHANICS
(2023)
Article
Mechanics
Domenico Davide Meringolo, Agostino Lauria, Francesco Aristodemo, Pasquale Fabio Filianoti
Summary: In this paper, the d-LES-SPH model, which is a large eddy simulation (LES) model introduced in smoothed particle hydrodynamics (SPH), is extended to handle multiphase flows. The validation is performed by comparing with established SPH solvers, a finite volume method solver based on turbulence closure, and experimental data. Different test cases, including a modified Taylor-Green vortex, wave breaking and splashing dynamics, and sloshing problem, are analyzed. Turbulence resolution is evaluated based on modeled and resolved turbulent kinetic energies, viscous dissipation, and turbulent viscosity dissipation.
Article
Mechanics
D. Ferraro, A. Lauria, N. Penna, R. Gaudio
Summary: This paper investigates the combined effects of a propeller jet and a uniform flow on a mobile bed, considering different propeller submergence depths and water discharges. Numerical simulations highlight the different behaviors observed in experimental runs with and without a uniform flow.
