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Artykuły w czasopismach na temat „End weir”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 1 sierpnia 2025

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1

Yuce, Mehmet Ishak, Aemad A. H. Al-Babely, and Mohammad A. Al-Dabbagh. "Flow simulation over oblique cylindrical weirs." Canadian Journal of Civil Engineering 42, no. 6 (2015): 389–407. http://dx.doi.org/10.1139/cjce-2014-0157.

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This paper presents a computational fluid dynamics (CFD) simulation to investigate the effects of the obliqueness of cylindrical weirs on the flow velocity distribution, the pressure distribution and the distribution of water depth over the weir crest. Three different cylindrical weirs with diameters of 0.114 m, 0.09 m, and 0.0635 m, with three dissimilar inclination angles of 90°, 135°, and 150° were used. The SSG Reynolds stress turbulence closure model was utilized in the analyses. The results show that the flow patterns are affected by the inclination angle with respect to the flow directi

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2

Atashi, Vida, Mahmood Shafai Bejestan, and Yeo Howe Lim. "Flow Pattern and Erosion in a 90-Degrees Sharp Bend around a W−Weir." Water 15, no. 1 (2022): 11. http://dx.doi.org/10.3390/w15010011.

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Different flow-altering methods, such as W−Weirs, have been developed to reduce erosion. For this study, we performed two experiments: (1) installing a W−Weir in various positions to determine the best angle for placement, and (2) investigating the variation of flow patterns and bed shear stress distribution in a 90-degree sharp bend by measuring the 3D components of flow velocities, with and without W−Weirs, where the greatest scour depth occurs. The results from the three installation angles indicate that less scour depth and volume of sediment removal occur when the weir is located close to

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3

Baylar, Ahmet. "An Investigation on the Use of Venturi Weirs as an Aerator." Water Quality Research Journal 38, no. 4 (2003): 753–67. http://dx.doi.org/10.2166/wqrj.2003.047.

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Abstract The most classic example of a hydraulic structure where gas transfer occurs is a weir. Transfer of gases between the atmosphere and river water can occur in a free overfall jet from a weir. A free overfall jet from a weir plunging into downstream water causes entrainment of air bubbles if the free overfall jet velocity exceeds the critical value where aeration occurs. This paper investigates the free overfall jets from Venturi and rectangular notch weirs and their effect on air entrainment rate. A Venturi weir was placed at the upstream channel end in order to increase the flow veloci

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4

Azimi, Hamed, and Saeid Shabanlou. "Comparison of Subcritical and Supercritical Flow Patterns Within Triangular Channels Along the Side Weir." International Journal of Nonlinear Sciences and Numerical Simulation 17, no. 7-8 (2016): 361–68. http://dx.doi.org/10.1515/ijnsns-2015-0103.

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AbstractSide weirs with triangular channel are used as flow controlling devices in draining and irrigation networks. By installing a side weir on the main conduits side walls, the runoff overflows from the weir and are conducted toward the diversion channel. In this study, changing of the flow free surface and the turbulence of the flow field in triangular channels with side weir are numerically simulated using volume of fluid (VOF) scheme and RNG k–ε turbulence model. In the present paper, the pattern of the spatially varied flow with decreasing discharge in both subcritical and supercritical

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5

Önen, Fevzi, and Hayrullah Agaçcioglu. "Scour at a side-weir intersection located on an alluvial river." Hydrology Research 38, no. 2 (2007): 165–76. http://dx.doi.org/10.2166/nh.2007.005.

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An experimental investigation of the equilibrium depth of local scour around side-weirs located on an alluvial river is presented in this paper. A sand bar in the middle of the channel and a scour hole close to the weir side is formed because of changes in shear stress field and velocity at the downstream end of the side weir. The depth of clear-water scour increases by time and approaches the equilibrium state asymptotically depending on approach flow velocity. The equilibrium depth of scour increases by the increase of the dimensionless parameters of approach flow velocity, water head ratio,

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6

Zulfan, ST., MSc, James, Tsani Rakhmawati, Ririn Rimawan, I. Putu Samskerta, and Slamet Lestari. "MODIFIKASI KOLAM OLAK TIPE AMBANG BERGIGI DALAM RANGKA REHABILITASI KERUSAKAN BENDUNG CIKEUSIK DI JAWA BARAT." JURNAL TEKNIK HIDRAULIK 13, no. 1 (2022): 39–52. http://dx.doi.org/10.32679/jth.v13i1.690.

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The presence of hydraulic jumps downstream of the weir structure is a natural occurrence that indicates a change in supercritical to subcritical flow characteristics. Hydraulic jump is one indicator of the dissipation of energy in the stilling basin. Therefore, the absence of a hydraulic jump can be a problem for some weirs, as happened in the Cikeusik Weir, which experienced damage to the stilling pool floor so that the energy dissipation did not function optimally. This paper will discuss the potential causes of damage to the Cikeusik weir and alternative designs for its countermeasures. A p

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7

Hussein, Samaa, and Mohammed Shamkhi. "Experimental Study of Flow Regimes of Stepped Weir." Wasit Journal of Engineering Sciences 11, no. 2 (2023): 82–93. http://dx.doi.org/10.31185/ejuow.vol11.iss2.438.

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 Depending on the discharge and the stepped weir's dimensions, flow over a stepped weir can be primarily divided into three different flow regimes: nappe, transition, and skimming. The different properties for each flow regime make the decision of the flow regime an important component in the design of a stepped weir. Five stepped weir models have been used in experiments to determine the flow regime limits for these weirs. The models were made with various numbers of steps (3, 5, 7, 10, and 14) and downstream slope angle of 30˚. The configurations of steps that tested were flat step, fu

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8

Dresel, P. E., P. Hekmeijer, J. F. Dean, W. Harvey, J. A. Webb, and P. Cook. "Use of laser-scan technology to analyse topography and flow in a weir pool." Hydrology and Earth System Sciences 16, no. 8 (2012): 2703–8. http://dx.doi.org/10.5194/hess-16-2703-2012.

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Abstract. The development of laser-scan techniques provides opportunity for detailed terrain analysis in hydrologic studies. Ground based scans were used to model the ground surface elevation in the area of a stream gauge weir over an area of 240 m2 at a resolution of 0.05 m. The terrain model was used to assess the possibility of flow bypassing the weir and to calculate stream flow during filling of the weir pool, prior to flow through the weir notch. The mapped surface shows a subtle low-lying area at the south end of the structure where flow could bypass the weir. The flow calculations quan

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9

Dresel, P. E., P. Hekmeijer, J. F. Dean, W. Harvey, J. A. Webb, and P. Cook. "Use of laser-scan technology to analyse topography and flow in a weir pool." Hydrology and Earth System Sciences Discussions 9, no. 3 (2012): 3721–38. http://dx.doi.org/10.5194/hessd-9-3721-2012.

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Abstract. The development of laser-scan techniques provides opportunity for detailed terrain analysis in hydrologic studies. Ground based scans were used to model the ground elevation in the area of a stream gauge weir over an area of 240 m2 at a resolution of 0.05 m. The terrain model was used to assess the possibility of flow bypassing the weir and to calculate stream flow during filling of the weir pool, prior to flow through the weir notch. The mapped surface shows a subtle low-lying area at the south end of the structure where flow could bypass the weir. The flow calculations quantify low

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10

Nkad, Naeem Zaer, Thamer Ahmad Mohammad, and Haider Mohammed Hammoodi. "Experimental Investigations on Scour Volume Upstream of a Slit Weir." Pertanika Journal of Science and Technology 30, no. 3 (2022): 1927–47. http://dx.doi.org/10.47836/pjst.30.3.09.

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The frequent removal of sediment accumulation from reservoirs by dredging requires interruption of power generation. Alternatively, this can be avoided by using a slit weir. In the present study, the impact of sediment nonuniformity, slit weir dimensions, weir slit position, and discharge on the effectiveness of sediment removal was experimentally investigated using a flume with a length of 12m, a width of 0.30m, and a depth of 0.30m. In the flume, a slit weir was tightly fixed at the end of a 2m working section filled with nonuniform sediments up to 110mm. Results showed that using coarser se

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11

N., J. SATHE, S. ASWAR D., A. HINGE G., and V. SURVE A. "STUDY OF END WEIR USING HEC-RAS OF GUNJWANI DAM SPILLWAY." IJIERT - International Journal of Innovations in Engineering Research and Technology 5, no. 6 (2018): 51–56. https://doi.org/10.5281/zenodo.1445889.

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<strong><strong> </strong>Hydraulic jump is the phenomenon in which the flow changes from superundal flow to subundal flow. The hydraulic jump concept is widely used in any hydraulic structures for energy dissipater at d/s side of the hydraulic structures. Hence Study of hydraulic jump is very important in such field. The HEC - RAS software is used to simulate the flow over ogee spillway. This software is used to determine the location of hydraulic jump and the nature of corresponding water surface profile. Results obtained from the H EC - RAS software are compared with theExperimental re

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12

Vatankhah, Ali R., and Somayeh Khalili. "Sharp-crested weir located at the end of a circular channel." Proceedings of the Institution of Civil Engineers - Water Management 170, no. 6 (2017): 287–97. http://dx.doi.org/10.1680/jwama.16.00032.

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13

Al-Hassani, Naeem Zayer, and Thamer Ahmad Mohammad. "Impact of the Weir Slit Location, the Flow Intensity and the Bed Sand on the Scouring Area and Depth at the Dam Upstream." Journal of Engineering 27, no. 5 (2021): 49–62. http://dx.doi.org/10.31026/j.eng.2021.05.04.

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A total of 48 experiments were conducted to investigate the impact of slit weir dimensions and locations on the maximum scour depth and scour area created upstream. The slit weir model was a 110 mm slit opening, and it was installed at the end of the working section in a laboratory flume. The flume was 10.0 m long, 30 cm wide, 30 cm deep, and almost middle. It includes a 2 m working section with a mobile bed with 110 mm in thickness. In the mobile bed, two types of nonuniform sand (with a geometric standard deviation of 1.58 and 1.6) were tested separately. The weir dimensions and location wer

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14

Hotchkiss, Rollin H., Emily A. Larson, and David M. Admiraal. "Energy Dissipation in Culverts by Forced Hydraulic Jump within a Barrel." Transportation Research Record: Journal of the Transportation Research Board 1904, no. 1 (2005): 124–32. http://dx.doi.org/10.1177/0361198105190400113.

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Riprap and concrete stilling basins are often built at culvert outlets to keep high-energy flows from scouring the streambed. Two simple alternatives to large basins are examined: a horizontal apron with an end weir and a drop structure with an end weir. The two designs are intended to reduce the flow energy at the outlet by inducing a hydraulic jump within the culvert barrel without the aid of tailwater. This research examines the jump geometry and the effectiveness of each jump type and proposes a design procedure for practicing engineers. The design procedure is applicable to culverts with

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15

Paramadita, Tifarah Dayansabila, Nadia Azarine, Aburizal Azhar, and Didit Puji Riyanto. "Local Scouring Visualization of Bed Channel Surface in Hydraulic Structure Using Surfer." Jurnal Teknik Sipil dan Perencanaan 24, no. 2 (2022): 140–49. http://dx.doi.org/10.15294/jtsp.v24i2.36499.

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Abstract. Water flowing in the river causes a scouring event that occurs at the bed channel. The existence of scouring will increase along with changes in the geometry of the river and obstacles such as the weir which are followed by local scouring around the weir. Local scouring often occurs downstream end of weir sill which weakens its construction. Scouring measurement was conducted to monitor the pattern of scouring that occurs. By using Surfer software, the scouring visualization through the Data Grid and 3D Surface can be seen. In this research, scour monitoring in the laboratory using o

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16

Baihaqi, Reza, Henny Herawati, and S. B. Soeryamassoeka. "DETERMINATION OF DISCHARGE COEFFICIENT THROUGH LABORATORY TESTING USING BROAD-CRESTED WEIR." Jurnal Teknik Sipil 24, no. 2 (2024): 1052. http://dx.doi.org/10.26418/jts.v24i2.68560.

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This study examined the impact of different threshold widths and channel narrowing configurations on water flow characteristics. The research involved testing three threshold widths (AL1, AL2, AL3) and six narrowing models (PM10, PM15, PM20, PT10, PT15, PT20) with varying water heights (1.0 cm, 1.5 cm, and 2.0 cm) above the threshold. Results indicated that narrowing at the upstream end increased water levels upstream and downstream, with a corresponding rise in flow velocity at the downstream end. Discharge values and coefficients varied significantly across different configurations, with non

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17

Kim, Jihoon, and Mintae Kim. "Stability Assessment of Weirs Reinforced with Sheet Piles." Journal of the Korean Society of Hazard Mitigation 24, no. 5 (2024): 251–58. http://dx.doi.org/10.9798/kosham.2024.24.5.251.

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Extreme weather events induced by climate change are increasing across the world. In particular, floods resulting from unpredictable heavy rains cause significant damage to property and human life. In Korea, river and underwater structure management is performed continuously in accordance with strict regulations. However, to prepare for unprecedented downpours, the structures of river reservoirs must be reinforced and their stability must be evaluated. This study focuses on the stability evaluation of piping, which represents the main cause of weir collapse. To this end, sheet piles are applie

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18

Zahn, Andreas, Lothar Ebner, Kurt Winkler, Jan Kratochvíl, and Jindřich Zahradník. "The effect of two-phase flow regime on hydrodynamics and mass transfer in a horizontal-tube gas-liquid reactor." Collection of Czechoslovak Chemical Communications 50, no. 3 (1985): 745–57. http://dx.doi.org/10.1135/cccc19850745.

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The effect of two-phase flow regime on decisive hydrodynamic and mass transfer characteristics of horizontal-tube gas-liquid reactors (pressure drop, liquid holdup, kLaL) was determined in a cocurrent-flow experimental unit of the length 4.15 m and diameter 0.05 m with air-water system. An adjustable-height weir was installed in the separation chamber at the reactor outlet to simulate the effect of internal baffles on reactor hydrodynamics. Flow regime maps were developed in the whole range of experimental gas and liquid flow rates both for the weirless arrangement and for the weir height 0.05

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19

Zulfan, J., M. S. Wardhana, C. I. Saputro, and B. M. Ginting. "Protective Measures for Scouring Effects in Serayu Micro Hydro Integrated Barrage." IOP Conference Series: Earth and Environmental Science 1311, no. 1 (2024): 012062. http://dx.doi.org/10.1088/1755-1315/1311/1/012062.

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Abstract Adding a new micro hydropower component to an established barrage, such as the Serayu Barrage in Central Java Province, poses significant structure risks and potentially compromises the stability of the structures. To mitigate these negative impacts, physical modeling was conducted at our hydraulic laboratory to accurately replicate 600 meters of the Serayu River, including the 110-meter-wide Serayu Barrage structure at a scale of 1:40. Multiple scenarios were examined to simulate hydrodynamic conditions and sediment transport along the barrage structure. Notably, downstream scouring

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20

Mameri, Daniel, Rui Rivaes, Maria Teresa Ferreira, Stefan Schmutz, and José Maria Santos. "Climate Change Effects on Fish Passability across a Rock Weir in a Mediterranean River." Water 13, no. 19 (2021): 2758. http://dx.doi.org/10.3390/w13192758.

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Climate change represents a major challenge for the management of native fish communities in Mediterranean rivers, as reductions in discharge may lead to a decrease in passability through small barriers such as weirs, both in temporary and perennial rivers. Through hydraulic modelling, we investigated how discharges from a large hydropower plant in the Tagus River are expected to affect the passability of native freshwater fish species through a rock weir (Pego, Portugal), equipped with a nature-like fish ramp. We considered not only mean daily discharge values retrieved from nearby gauging st

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21

Vatankhah, Ali R., and S. Khalili. "Stage-Discharge Relationship for Weir–Orifice Structure Located at the End of Circular Open Channels." Journal of Irrigation and Drainage Engineering 146, no. 8 (2020): 06020006. http://dx.doi.org/10.1061/(asce)ir.1943-4774.0001494.

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22

Sadeghi Googheri, Yaser, Mojtaba Saneie, and Sirous Ershadi. "Three-Dimension Numerical Simulation of Scour Temporal Changes due to Flow in the Downstream of Combined Weirs and Gate Model." Civil Engineering Journal 3, no. 11 (2017): 1111. http://dx.doi.org/10.28991/cej-030941.

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Most of weirs create a region with relatively static water in upstream, which can be the place of sediments and wastes deposition in water. Sediments accumulation in upstream changes flow conditions. In this case, combined weir and gate can be propounded as a useful solution. In the present paper, Flow3D was used to numerically simulate temporal changes of scour in combined free flow over weirs and below gates. Numerical modeling was run after fully preparing and the obtained data was analyzed under three-dimensional conditions. Comparing experimental and numerical results with data fitness re

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23

Qasim, Rafi M., Ihsan A. Abdulhussein, and Muna A. Hameed. "Analysis of the hydraulic interference between the baffles and the composite hydraulic structure." EUREKA: Physics and Engineering, no. 6 (November 30, 2023): 104–17. http://dx.doi.org/10.21303/2461-4262.2023.002894.

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The purpose of the present study is to examine the influence of baffles presence at downstream system on weir gate hydraulic response. Two baffles configuration (triangle and angle shapes) are installed in bed flume. Two different spacing are used between the baffles and two different directions for baffles are also adopted. The study tries to investigate the variation in upstream Froude number, downstream Froude number, Reynolds number, actual discharge, discharge coefficient, downstream average water depth and the hydraulic system efficiency which is expressed as function of downstream water

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24

Zhang, Penggao, Boqin Gu, Jianfeng Zhou, and Long Wei. "On hydrodynamic lubrication characteristics of ferrofluid film in a spiral groove mechanical seal." Industrial Lubrication and Tribology 70, no. 9 (2018): 1783–97. http://dx.doi.org/10.1108/ilt-07-2017-0186.

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Purpose The purpose of this study is to investigate the hydrodynamic lubrication characteristics of ferrofluid film for spiral groove mechanical seal in external electromagnetic field and to analyze the effects of the volume fraction of ferrofluid, parameters of the electromagnetic field, operating parameters and geometrical parameters of mechanical seal on the characteristics of ferrofluid film. Design/methodology/approach The relationship between the ferrofluid viscosity and the intensity of external electromagnetic field was established. Based on the Muijderman narrow groove theory, the pre

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25

Hadi, Suprapto, Wateno Oetomo, and Esti Wulandari. "Construction Management of Jati Weir Rehabilitation (Channel Madiun Irrigation Area) Magetan Regency with Value Engineering & Scheduling Implementation Management Planning." Devotion Journal of Community Service 3, no. 14 (2022): 2497–518. http://dx.doi.org/10.36418/dev.v3i14.301.

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One of the infrastructure developments in the region that will soon be implemented is the construction of the Jati Weir rehabilitation construction project which is the main dam in the Madiun Irrigation Area (DI SIM) Main Channel in Magetan Regency. In order to maximize the results of cost and time, it is necessary to have a flexible technique or management in the work of this project. The method used to determine alternative types of construction that are efficient and effective in terms of cost and time is the application of Value Engineering in the Jati Weir rehabilitation planning work. Th

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26

Santoso, Budi, Lily Montarcih Limantara, Widandi Soetopo, and Sri Wahyuni. "Optimization Model of Batutegi Reservoir Operation Pattern by Using the Simulation Method of Cropping Pattern for Obtaining the Economic Expected Value." Journal of Southwest Jiaotong University 56, no. 3 (2021): 284–94. http://dx.doi.org/10.35741/issn.0258-2724.56.3.24.

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This research intends to manipulate the cropping pattern by moving the first cropping pattern schedule in the Batutegi reservoir due to the irrigation area of Way Sekampung being 55,373 ha. The methodology consists of manipulating the cropping patterns as the optimization result of the simulation model. The simulation is performed by analyzing the water balance, which is based on the water supply and demand. The existing condition results are as follows: the crop beginning in the middle of December 2018, the minimum reservoir volume is 107.55 million m3, the reservoir volume at the end of Dece

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27

Bohté, R., M. L. Mul, T. A. Bogaard, H. H. G. Savenije, S. Uhlenbrook, and T. C. Kessler. "Hydrograph separation and scale dependency of natural tracers in a semi-arid catchment." Hydrology and Earth System Sciences Discussions 7, no. 1 (2010): 1343–72. http://dx.doi.org/10.5194/hessd-7-1343-2010.

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Abstract. A solid understanding of the hydrological processes in a catchment is important in order to guarantee appropriate management of the available surface and groundwater resources, both in terms of quality and quantity. In order to achieve this, insights in the behaviour of the water fluxes and the interaction between groundwater and surface water is of utmost importance. This paper discusses the applicability and constraints of using hydrochemical and isotope tracers in identifying the runoff contributing sources at different scales in a semi-arid catchment in Tanzania. The hydrograph s

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28

Manubulu, Christiani Chandra, Yulius Patrisius Kau Suni, and Don Gaspar Da Costa. "Determination of River Border Width at the Manikin River in Kupang Regency, Nusa Tenggara Timur Province." IOP Conference Series: Earth and Environmental Science 1233, no. 1 (2023): 012041. http://dx.doi.org/10.1088/1755-1315/1233/1/012041.

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Abstract River Border Lines was made and determined so that there some efforts were made for the protection, use and control of existing resources in the river. One of the river segments that are prioritized for determining river border lines is a river section adjacent to or within a developing area, one of which is the Manikin River in Kupang Regency, which is currently under construction of the Tefmo Dam which is targeted to be completed by the end of 2022. Therefore, in the future, of course, area around the weir will experience great pressure on land use which can have an impact on the fu

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Sheikh Rezazadeh Nikou, Neda, Aonghus Mc Nabola, and Alinaghi Ziaei. "Enhancing Ecological Design Principles in Vortex Settling Basins for Sustainable Water Management." Water 17, no. 4 (2025): 496. https://doi.org/10.3390/w17040496.

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Continuous flushing systems such as vortex settling basins (VSBs) are commonly utilized to remove sediment particles in power plants and irrigation and drainage networks. This study evaluates the performance of a typical VSB, focusing on sediment removal efficiency (ηe), flow efficiency (ηflow), and inlet canal efficiency (ηin). In the continuous operation of VSBs, sediment removal efficiency remains the appropriate metric, as opposed to trapping efficiency. The impact of hydraulic and geometric parameters was analyzed using the Taguchi design, experimental modeling, and statistical analysis t

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Jaya Negara, I. Dewa Gede, Salehudin Salehudin, Lilik Hanifah, I. Wayan Yasa, and Ni Putu Ira Sintia Kurnianti. "Variasi Penempatan Bronjong Di Hilir Kolam Olak Terhadap Pola Gerusan Dasar." JURNAL SAINS TEKNOLOGI & LINGKUNGAN 8, no. 1 (2022): 48–57. http://dx.doi.org/10.29303/jstl.v8i1.300.

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The existence of a weir is often disrupted by the occurrence of scouring downstream, which results in an insecure weir position. This study aims to determine the effect of installation of gabion variations downstream of stilling ponds on the depth and length of scour at the bottom of the channel. The test was carried out at the Hydrology and Coastal Laboratory of FT Unram in a straight channel with dimensions of 7.5 m x 0.55 m x 0.5 m, with an Ogee type spillway and a USBR Type III stilling pond. The dimensions of the test gabions are 0.55 m x 0.18 m x 0.09 m with a gravel diameter of 1 (P1 )

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Angiulli, Giovanni, and Mario Versaci. "Extraction of the Electromagnetic Parameters of a Metamaterial Using the Nicolson–Ross–Weir Method: An Analysis Based on Global Analytic Functions and Riemann Surfaces." Applied Sciences 12, no. 21 (2022): 11121. http://dx.doi.org/10.3390/app122111121.

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The characterization of electromagnetic metamaterials (MMs) plays a fundamental role in their engineering processes. To this end, the Nicolson–Ross–Weir (NRW) method is intensively used to recover the effective parameters of MMs, even though this is affected by the branch ambiguity problem. In this paper, we face this issue in the context of global analytic functions and Riemann surfaces. This point of view allows us to rigorously demonstrate the mathematical foundations of an algorithmic approach for avoiding the branch ambiguity problem, in which the phase unwrapping method is merged with K-

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Tengku Fadhlin Tengku Mohmed Noor Izam, Nuryazmeen Farhan Haron, Siti Nurhayati Mohd Ali, Noor Suraya Romali, and Saerahany Legori Ibrahim. "Idealised Estuary Salinity-Morphology Effect Characterisation Investigation." Journal of Advanced Research in Applied Sciences and Engineering Technology 42, no. 1 (2024): 93–103. http://dx.doi.org/10.37934/araset.42.1.93103.

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Estuaries are bodies of water along the coasts that are formed when fresh water from rivers flows into and mixes with salt water from the ocean. The density of seawater is greater than fresh water and it varies with salinity and temperature. Fresh water tends to float on top of seawater because of its lower density. Human-induced activities like the dredging of shipping lanes along the bottom estuarine, the dumping of industrial wastes into the water system, and shoreline development influence estuarine dynamics which include the mixing process. These activities lead to salinity changes and fu

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Frota, Felipe Facó, Bárbara Pereira Paiva, and Carlos Augusto França Schettini. "Intra-tidal variation of stratification in a semi-arid estuary under the impact of flow regulation." Brazilian Journal of Oceanography 61, no. 1 (2013): 23–33. http://dx.doi.org/10.1590/s1679-87592013000100003.

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The Jaguaribe River is the largest semi-arid Brazilian river and represents an important water source for the state of Ceará. The Castanhão Weir, built to regulate the flow of the Jaguaribe, began operating successfully in the 1990s. As a result, the hydrodynamic regime of the estuary has undergone alteration and is no longer subject to the former annual climatological variability of the dry and rainy seasons. This paper introduces an assessment of the changes in the hydrological conditions resulting from the construction of the weir and investigates the structure of the density stratification

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Ren, Jinjing, Mingjie Sheng, and Zhongyuan Zhou. "An Effective Method for Electromagnetic Parameter Measurement of Flexible Materials Based on Air Coaxial Line." International Journal of Antennas and Propagation 2022 (December 17, 2022): 1–7. http://dx.doi.org/10.1155/2022/1667251.

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When measuring the electromagnetic parameters of flexible material with an air coaxial line, the specimen is prone to bend and deform in the fixture, which results in erroneous results. In order to solve this problem, this paper proposes a new measurement method. Firstly, a rigid material is selected and loaded into the air coaxial line for two-port S parameters measurement. Then, the flexible material is attached to one end of the rigid material and loaded into the air coaxial line together for repeated two-port S parameter measurement. According to the S parameters measured and the two-port

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Mahamood, Nur Aqilah Nabihah, Nuryazmeen Farhan Haron, Siti Nurhayati Mohd Ali, Mohammad Naser Sediqi, and Mazlin Jumain. "Investigating Salinity Variation in Estuarine System: Effects of Upstream Water Levels – A Laboratory Study." Jurnal Kejuruteraan 36, no. 5 (2024): 2147–53. http://dx.doi.org/10.17576/jkukm-2024-36(5)-32.

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Estuaries, where freshwater rivers converge with saline ocean water, play vital roles in supporting marine life and human civilization. This study examines salinity dynamics in estuarine systems, focusing on the impact of upstream water level changes on saltwater intrusion. Through experimental manipulation in an idealised channel, varying water depths upstream were simulated. With a 15cm and 30cm differential in the water level upstream, freshwater flows from one end of the flume overflowing a moveable weir at the other end. The saline water combined with a red-coloured tracer to differentiat

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Lombard, R. T. J. "Stigting van die Vaalhartsbesproeiingskema as heenkome vir hawelose armblankes." New Contree 24 (June 28, 2024): 8. http://dx.doi.org/10.4102/nc.v24i0.696.

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Owing to the economic crisis and drought of the early 1930s, the government decided to begin with the construction of a scheme which would provide a means of livelihood for thousands of poor whites. In addition to a large storage dam (Vaal Dam) which was to ensure a sufficient supply of water to the scheme, a diversion weir (Vaalharts Dam) was also constructed on the Vaal River. By means of its network of concrete canals running across the entire Hans Valley up to Taung, this system could irrigate 1 250 plots of approximately 25 hectares each. In April 1938 the first 27 farmers were settled on

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Ali, Taghinezhad, Javad Riasati Mohammad, and Rassaei Ehsan. "BRAIN. Broad Research in Artificial Intelligence and Neuroscience-The Impact of Teaching Critical Thinking on Iranian Students' Writing Performance and Their Critical Thinking Dispositions." BRAIN. Broad Research in Artificial Intelligence and Neuroscience 9, Special Issue (2018): 64–80. https://doi.org/10.5281/zenodo.1245546.

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This study was intended to investigate the effectiveness of teaching critical thinking on students’ writing performance and their critical thinking dispositions. To this end, 140 students were selected. 73 students were assigned to the experimental group and 67 were assigned to the control group. The experimental group received instruction in critical thinking strategies whereas the control group did not. The instruments used in this study were the researcher-developed essay test, the Ennis-Weir critical thinking essay test, and the California Critical Thinking Dispositions Inventory (CC

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Riskia, Annissa Cindra, Ridwan Ridwan, Muhammad Amin, and Sandi Asmara. "Analisis Ketersediaan Air pada DAS Way Tembulih Untuk Kebutuhan Air Irigasi Berbasis Sistem Informasi Geografis di Kecamatan Ngaras Kabupaten Pesisir Barat." Jurnal Agricultural Biosystem Engineering 3, no. 1 (2024): 99. http://dx.doi.org/10.23960/jabe.v3i1.8920.

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The purpose of this research were to determine the amount of potential water resource for food crops (rice and secondary crops), determine the optimal planting area of food crops (rice and secondary crops) according to the potential of available water resource and determine the cropping pattern of food crops (rice and secondary crops) in accordance with potential available water resource. The research was carried out with the stages of land water balance analysis technique using the SWAT (Soil and Water Assessment and Tools) model, analysis of irrigation water needs, analysis of reliable disch

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Chao, Yi-Chiung, Chi-Wen Chen, Hsin-Chi Li, and Yung-Ming Chen. "Riverbed Migrations in Western Taiwan under Climate Change." Water 10, no. 11 (2018): 1631. http://dx.doi.org/10.3390/w10111631.

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In recent years, extreme weather phenomena have occurred worldwide, resulting in many catastrophic disasters. Under the impact of climate change, the frequency of extreme rainfall events in Taiwan will increase, according to a report on climate change in Taiwan. This study analyzed riverbed migrations, such as degradation and aggradation, caused by extreme rainfall events under climate change for the Choshui River, Taiwan. We used the CCHE1D model to simulate changes in flow discharge and riverbed caused by typhoon events for the base period (1979–2003) and the end of the 21st century (2075–20

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Arbi, Yaumal, Novirman Jamarun, and Bagas Sumbara. "Analysis of Irrigation Water Requirement in Batang Sanipan 2 Irrigation Area Limapuluh Kota Regency." CIVED 10, no. 3 (2023): 1187–95. http://dx.doi.org/10.24036/cived.v10i3.4.

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Limapuluh Kota Regency is one of the rice producing districts in West Sumatra Province, so an irrigation network is needed to meet water requirement for agricultural productivity. The problem that occurs in the Batang Sanipan 2 irrigation area is the inability of water to flow through the service area to the end point of the irrigation area. Based on observations from e-PAKSI data from the Limapuluh Kota Regency Public Works Office, water can only flow up to a distance of 3.175 km from the intake gate and experience water loss along 1.445 km to the end of the canal. Therefore, it is necessary

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Lufira, R. D., S. Marsudi, S. Agustien, and A. Khosin. "Determining the Depth of Local Scouring in a Downstream Energy Dissipation in the Physical Model Test." IOP Conference Series: Earth and Environmental Science 930, no. 1 (2021): 012022. http://dx.doi.org/10.1088/1755-1315/930/1/012022.

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Abstract Karangnongko Weir is planned to be located in the Bengawan Solo River (Lower Solo River Basin) about 15 km downstream of the confluence of Bengawan Solo River with the Madiun River in Ngelo Village, Margomulyo Sub-District, Bojonegoro Regency, and Ngrawoh Village in Kradenan Sub-District, Blora Regency. This study aims to determine the Depth and pattern of scouring in downstream energy dissipation through physical model tests based on initial planning. Downstream protection of energy dissipation in the original design model combines 50 m of riprap rocks and 50 m of riprap concrete for

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Blackett, Roger F. "Development and Performance of an Alaska Steeppass Fishway for Sockeye Salmon (Oncorhynchus nerka)." Canadian Journal of Fisheries and Aquatic Sciences 44, no. 1 (1987): 66–76. http://dx.doi.org/10.1139/f87-008.

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A major introduced run of sockeye salmon (Oncorhynchus nerka) at Frazer Lake, Kodiak Island, Alaska, is perpetuated by an Alaska steeppass fishway at a 10-m-high falls on the outlet river. Experimental modifications of the fishway, which was inadequate by 1970 as the salmon run increased, improved salmon entry and passage. Sockeye passage over 4 yr was nearly equivalent in a steeppass of 60 m continuous length (22% slope) and an adjoining steeppass with three resting pools, but significant year-to-year differences in passage occurred between steeppasses. Resting tanks were beneficial for holdi

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White, G. C., I. C. Smalls, and P. A. Bek. "Carcoar Wetland – A Wetland System for River Nutrient Removal." Water Science and Technology 29, no. 4 (1994): 169–76. http://dx.doi.org/10.2166/wst.1994.0183.

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During December, 1991 the NSW Department of Water Resources commenced construction of an artificial wetland at the upstream end of Carcoar Dam near Blayney in central western NSW. The principal function of the wetland is to reduce nutrient inputs, especially phosphorus, from the Belubula River into Carcoar storage and consequently lower the incidence of blue-green algal blooms which occur most summers. The wetland is a multi-faceted project involving substantial research and community involvement. Construction of the wetland weir and levees was completed during April, 1992. Stage one of the we

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Neagle, Connor, Alexander Chouljenko, Greg Bolton, et al. "Effect of Pilot-Scale Decanter Centrifuge Processing Parameters on the Quality of Fish Meal Produced from Smoked Salmon Processing By-Products." Processes 13, no. 2 (2025): 511. https://doi.org/10.3390/pr13020511.

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Fish waste (FW) serves as an underutilized resource in agriculture, especially among small-scale processors. The trimmings and skins generated during the manufacturing of smoked salmon often end up in landfills due to insufficient quantities and logistical challenges to promote upcycling. An additional consideration is the high fat and mineral content in the smoked Atlantic salmon (Salmo salar) used for this study. We tested the feasibility of technology that small-scale processors can adapt to upcycle smoked salmon by-products into fish meal (FM) and fish oil (FO). A two-phase decanter centri

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Doody, Tanya M., Simon N. Benger, Jodie L. Pritchard, and Ian C. Overton. "Ecological response of Eucalyptus camaldulensis (river red gum) to extended drought and flooding along the River Murray, South Australia (1997–2011) and implications for environmental flow management." Marine and Freshwater Research 65, no. 12 (2014): 1082. http://dx.doi.org/10.1071/mf13247.

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Riparian forest and woodlands of the lower River Murray floodplain are exhibiting deteriorating health as a result of anthropogenic alterations to flow regimes and south-eastern Australia’s long-term ‘Millennium Drought’ from 1997 to 2009. Extensive flooding in 2010/2011 brought the drought to an end, providing an opportunity to monitor ecological floodplain recovery. The relationship between flooding and lateral recharge and condition of the dominant riparian tree species, Eucalyptus camaldulensis, was determined between 2007 and 2011 using the Landsat (LTM5) Normalised Difference Vegetation

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Hartanto, Azis, S. Imam Wahyudi, and Soedarsono Soedarsono. "Asset Management and Performance of Information System-Based Irrigation System (EPAKSI) Case Study of Cabak Irrigation Area, Temanggung Regency." Jurnal Indonesia Sosial Sains 5, no. 03 (2024): 379–90. http://dx.doi.org/10.59141/jiss.v5i03.1020.

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The purpose of this study is to determine the process of data inputted and analyzed through the ePAKSI application, In this thesis used primary and secondary data collection methods. Secondary data as a support for primary data were obtained from the Office of the Public Works and Spatial Planning Office of Temanggung Regency and from the Office of the Food Security, Agriculture and Fisheries Office of Temanggung Regency. The results showed that the data inputted and analyzed with the ePAKSI application included data on asset types, asset names, nomenclature, dimensions and conditions ranging

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Kunimatsu, T., T. Otomori, K. Osaka, E. Hamabata, and Y. Komai. "Evaluation of nutrient loads from a mountain forest including storm runoff loads." Water Science and Technology 53, no. 2 (2006): 79–91. http://dx.doi.org/10.2166/wst.2006.041.

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Water quality and flow rates at a weir installed on the end of Aburahi-S Experimental Watershed (3.34 ha) were measured once a week from 2001 to 2003 and in appropriate intervals from 30 min to 6 h during five storm runoff events caused by each rainfall from 8 mm to 417 mm. The average annual loads of total nitrogen (TN) and total phosphorus (TP) were calculated to be 19.0 and 0.339 kg ha−1 y−1 from the periodical data by using the integration interval-loads method (ILM), which did not properly account for storm runoff loads. Three types of L(Q) equations (L=aQb) were derived from correlations

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Qasim, Jihan M. "The Overshot Gate as a Flow-Measuring Device." ARO-THE SCIENTIFIC JOURNAL OF KOYA UNIVERSITY 11, no. 1 (2023): 143–48. http://dx.doi.org/10.14500/aro.11170.

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The overshot gate is a commonly used adjustable overflow weir for regulating the upstream water level in open channels. The amount of gate movement is proportional to the water level change. However, to effectively manage the water flow, it is also important for operators to accurately measure the flow rate in the channel. This study examines an overshot gate installed at the end of a laboratory flume to estimate the flow rate under various free flow conditions. This study investigates different gate angles ranging from 9.6° to 90° to evaluate their impact on the flow properties and the discha

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R., Suraj, and Jithish K.S. "Wear analysis on EN8, EN9 and EN24." World Journal of Engineering 14, no. 3 (2017): 188–92. http://dx.doi.org/10.1108/wje-05-2016-0002.

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Purpose This paper aims to present a comparative study of the wear properties of ferrous welded materials like EN8, EN9 and mild steel (MS). Design/methodology/approach The material is cut into specific dimension after hardfacing and is studied for the wear properties of the material. The wear testing is done on a pin-on-disc apparatus. The microhardness of the material is studied using the Vickers microhardness measuring apparatus. Findings The wear properties of ferrous welded materials like EN8, EN9 and MS are studied. It is found the MS has the least wear when compared to EN8 and EN9. The

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Anjos, Bruna Ferreira dos, Tatiane Kelly Barbosa de Azevêdo, Bruna Rafaella Ferreira da Silva, Renata Martins Braga, Alexandre Santos Pimenta, and Francisca Adriana Ferreira De Andrade. "Tannins from cashew tree (Anacardium occidentale) bark as a flocculant for water clarification." Ambiente e Agua - An Interdisciplinary Journal of Applied Science 17, no. 3 (2022): 1–12. http://dx.doi.org/10.4136/ambi-agua.2815.

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Concern about the overexploitation of natural resources has increased in recent decades, especially involving water and its treatment. Paradoxically, one of the sources of water pollution is the treatment itself, due to the use of chemical flocculants, which end up generating sludge that may be highly aggressive to the environment. One of the ways to solve this problem is to use natural flocculants for this purpose, since they are biodegradable and do not harm nature. This study evaluated the efficiency of a natural flocculant produced from tannins extracted from the bark of the cashew tree (A

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