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Littérature scientifique sur le sujet « Weir »

Auteur : Grafiati
Publié le 4 juin 2021
Mis à jour le 6 septembre 2023

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Articles de revues sur le sujet "Weir"

1

Zhuk, Volodymyr, Ivan Matlai, Ihor Popadiuk, Lesiia Vovk et Vladyslav Rehush. « Discharge coefficient of broad-crested weirs as a function of the relative weir height for different weir lengths ». Theory and Building Practice 2020, no 2 (20 novembre 2020) : 63–68. http://dx.doi.org/10.23939/jtbp2020.02.063.

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Broad-crested weirs (BCW) are often used in hydraulic engineering and water management. The most complex factor that affects the discharge capacity of BCW is the discharge coefficient. In Ukrainian engineering practice, the flow rate of BCW is defined as a function of the relative height of the spillway wall, while in the most common European methods – as a function of the relative length of the weir. The experimental dependences of the discharge coefficient of rectangular sharp-edged BCW with vertical inlet and outlet walls with the ratio of the weir length and height d/Р = 2; 4 are obtained. A comparison of the obtained results with the values of the discharge coefficient of the same BCW using the methods of Kumin and Hager indicates that this coefficient depends on both the height of the wall and the length of the weir. The corresponding empirical power law dependences are obtained. At the same values of the relative height of the wall, the discharge coefficient for the weir with the ratio d/Р = 4 is significantly lower comparing the weir with d/Р = 2, that can be explained by the more significant effect of friction resistance for the weir with longer threshold.
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Bhukya, Raj Kumar, Manish Pandey, Manousos Valyrakis et Panagiotis Michalis. « Discharge Estimation over Piano Key Weirs : A Review of Recent Developments ». Water 14, no 19 (26 septembre 2022) : 3029. http://dx.doi.org/10.3390/w14193029.

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The piano key (PK) weir has advanced over the labyrinth weir to increase the discharge capacity. Piano key weirs exhibit nonlinear flow behavior and are easy to place on the existing spillway or newly constructed dam with less base area. Various investigators are given equations to calculate the discharge coefficient for free and submerged flow conditions. The study focuses on reviewing the impacts of the PK weir geometry on the weir flow discharge coefficient, including weir length and height, upstream and downstream key widths, and apex overhangs. In this study, all possible aspects of PK weirs were briefly reviewed. From sensitivity analysis, it is observed that the discharge coefficient of the PK weir is more sensitive for the L/W dimensionless ratio followed by the B/P ratio. L is total length of the weir crest, W is width of the weir, B is total width of PK weir and P is height of the weir. This review paper is intended to serve as an accessible resource for hydraulic structures researchers and hydraulic engineering professionals alike interested in the hydraulics of PK weirs.
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Emiroglu, M. Emin, et Ahmet Baylar. « Experimental Study of the Influence of Different Weir Types on the Rate of Air Entrainment ». Water Quality Research Journal 38, no 4 (1 novembre 2003) : 769–83. http://dx.doi.org/10.2166/wqrj.2003.048.

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Abstract Aeration is used in water treatment to alter the concentration of dissolved gases, to strip volatile organics, and to reduce tastes and odours. This can be obtained by creating turbulence in the water. One method of producing such turbulence is via the overflow jets downstream of weir structures. This paper investigates the effect of varying weir types on the air entrainment rate. Empirical correlations predicting the maximum penetration depth and air entrainment rate were developed for different weir types. It is demonstrated that the air entrainment rate of the broad-crested weirs is generally much better than for the sharp-crested weir and the labyrinth weirs. The air entrainment rate increased as the weir longitudinal slope of the broad-crested weirs and the weir sill slope of the labyrinth weirs became larger.
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4

Al Babely, Emad Abdul-Gabbar, Adnan Abdul-Wahab Al Muhammad et Mohammad A. Al Dabbagh. « Overflow Characteristic of Cylindrical Shape Crest Weirs over Horizontal Bed ». Tikrit Journal of Engineering Sciences 18, no 4 (31 décembre 2011) : 29–39. http://dx.doi.org/10.25130/tjes.18.4.04.

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The most common types of weirs are the broad-crested weir, the sharp-crested weir, the circular crested weir and the ogee crested weir. Advantages of the cylindrical weir shape include the stable overflow pattern, the ease to pass floating debris, the simplicity of design compared to ogee crest design and the associated lower costs. In present study, it was investigated the overflow characteristics of circular weirs in laboratory for various cylinder radii of three sizes (11.4, 9.0, 6.3 cm), and the models fixed on the channel bed vertically to the direction of flow. The result shows that the increase in the ratio of head to weir radius ratio (Hw/R) value causes an increase in discharge coefficient (Cd) value for the same height of weir. It was observed that the cylinder size (i.e. radius of cylindrical weir (R)) has an effect on the (Cd). The flow magnification factor (qw/qs) increases with an increase in (Hw/R) value and values of (qw/qs) were always higher than one for all values of (Hw/R), this means that weirs of cylindrical shape performed better than those of sharp crest for any value of weir radius tested in this study
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Vanishree, B. Rao, et R. Manjula. « Analysis of various parameters affecting weir design and fabrication of Weirs : An Overview ». MATEC Web of Conferences 144 (2018) : 01006. http://dx.doi.org/10.1051/matecconf/201814401006.

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Several geometric parameters influence weir discharge and it is explained in our present study. The PK weir is more efficient than rectangular labyrinth weir due to reduction in entrance losses of PK weir inlet key geometry. PK weir is a type of labyrinth weir with variation in angle. Therefore, in this paper we also discuss about labyrinth weir. PKW are compatible for constructing on existing or new spillway with lesser space requirement and structural stability. PKW are installed in order to increase the discharge capacity for a given footprint area. PKW is used to increase the overflow capacity of existing dams such as, Hazelmare dam (South Africa), Dartmouth dam (Australia). Trapezoidal piano key weirs have higher discharge efficiency than rectangular weirs and it is due to interference wedge. Cd of TPKW is influenced by L/W but Wi/Wo has least effect.
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Baylar, Ahmet. « An Investigation on the Use of Venturi Weirs as an Aerator ». Water Quality Research Journal 38, no 4 (1 novembre 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 velocity of the free overfall jet and, in turn, to increase air entrainment. It was demonstrated that the air entrainment rate of the Venturi weir is significantly better than the rectangular notch weir, and this advantage becomes more pronounced as the throat width of the Venturi weir is decreased. These results demonstrated that Venturi weirs can be used as highly effective aerators in streams, rivers, constructed channels, fish hatcheries, water treatment plants, etc. Moreover, a regression equation was obtained for the Venturi weirs, relating air entrainment rate to unit discharge, weir crest width, drop height and throat width of Venturi weir. There was good agreement between the measured air entrainment rates and the values computed from the predictive equation.
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7

Bijankhan, Mohammad, et Vito Ferro. « Dimensional analysis and stage-discharge relationship for weirs : a review ». Journal of Agricultural Engineering 48, no 1 (17 février 2017) : 1–11. http://dx.doi.org/10.4081/jae.2017.575.

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Deducing the weir flow stage-discharge relationship is a classical hydraulic problem. In this regard Buckingham’s theorem of dimensional analysis can be used to find simple and accurate formulas to obtain the rating curves of different weir types. At first, in this review paper the rectangular weir that is a very common hydraulic structure is studied. It is indicated that the crest shape, approach channel width, obliquity (angle between the weir crest and the direction normal to the flow motion) and vertical inclination (pivot weir) are the key-parameters affecting the flow over the rectangular weirs. The flow over the triangular, labyrinth, parabolic, circular, elliptical, and W-weirs are also studied using dimensional analysis and incomplete self-similarity concept. For all mentioned weirs the stage-discharge relationships are presented and the application limits are discussed. The results of this paper can be used and implemented by the irrigation and drainage network designers to simplify the procedure of weir design.
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Namaee, Mohammad Reza, Mohammad Sadegh Jalaledini, Mahdi Habibi, Saeed Reza Sabbagh Yazdi et Mona Ghafouri Azar. « Discharge coefficient of a broad crested side weir in an earthen channel ». Water Supply 13, no 1 (1 février 2013) : 166–77. http://dx.doi.org/10.2166/ws.2012.081.

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Side weirs are widely used to divert flows from rivers and channels. However, the hydraulic behavior of this type of weir is complex and difficult to predict accurately. Previous studies on side weirs have generally focused on side weirs in rectangular channels with a smooth bed. However, one of the applications of side weirs is in irrigation systems which have trapezoidal cross sections and significant bed roughness. The present study investigates the hydraulic behavior of a broad crested side weir in an earthen channel with a rough bed under subcritical flow. These investigations showed that the side weir discharge coefficient is influenced by four main parameters which are upstream Froude number, ratio of the main channel width to the upstream flow depth, ratio of the length of the side weir to the main channel width and ratio of side weir height to the upstream flow depth. The results showed that the discharge coefficient of the side weir gives a lower coefficient value compared to other researchers’ equations. Nearly 90 experimental tests were carried out and finally new equations are proposed for prediction of discharge coefficient of a broad crested side weir in an earthen channel under subcritical conditions which can be mainly used in common irrigation systems.
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9

Baylar, Ahmet, et M. Emin Emiroglu. « The effect of sharp-crested weir shape on air entrainment ». Canadian Journal of Civil Engineering 29, no 3 (1 juin 2002) : 375–83. http://dx.doi.org/10.1139/l02-017.

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Aeration in the waters of rivers and streams is very important to the quality and existence of aquatic life. If the overfall jets downstream of weir structures plunges into a plunge pool, entrained air bubbles will contribute to aeration. This paper investigates sharp-crested weirs having different cross-sectional geometry and their effect on the air entrainment rate. It is demonstrated that the air entrainment rate of a 30° triangular sharp-crested weir is better than that of the other sharp-crested weirs tested. Moreover, variation in the number of V-notches over the width of the weir plate was studied for 30° triangular sharp-crested weirs. The 30° triangular sharp-crested weir with two V-notches was found to have higher values of air entrainment rate.Key words: aeration, air entrainment rate, plunging overfall jet, sharp-crested weir.
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10

Rezazadeh, Shiva, Mohammad Manafpour et Hamze Ebrahimnejadian. « Three-Dimensional Simulation of Flow Over Sharp-Crested Weirs Using Volume of Fluid Method ». Journal of Applied Engineering Sciences 10, no 1 (1 mai 2020) : 75–82. http://dx.doi.org/10.2478/jaes-2020-0012.

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AbstractIn sharp crested weirs, significant changes occur in the hydraulic characteristics of the flow past the weirs with different geometry. A detailed investigation and better understanding of hydraulic behavior will help practically to choose an appropriate geometry for weir. The purpose of this research is simulate the flow over sharp crested weir and investigate the effect of geometric shapes of sharp crested weirs on hydraulic characteristics of the flow such as pressure, velocity, water level profiles and discharge coefficients. Thus the limitation and usage range of sharp crested weirs are clarified. In this research OpenFOAM open source 3D software with RNG K-ε turbulence model and Volume of Fluid method (VOF) was used to analyze the hydraulic flow passing through sharp crested weir. The correlation coefficient for flow Surface profiles and discharge coefficients among numerical and experimental data is obtained 0.96 for different discharge rates. In the present research, discharge coefficients for rectangular weirs with compression coefficient 0%, trapezoidal and triangular weirs are determined 1.20, 0.68 and 0.51 respectively using discharge rate of 0.05183m3/s. The maximum discharge coefficient is obtained for rectangular sharp crested weir while the triangular sharp crested weir has minimum discharge coefficient.
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Thèses sur le sujet "Weir"

1

Reddy, K. Ranga. « Study And Design Of Two-Thirds Power Weir ». Thesis, Indian Institute of Science, 2000. https://etd.iisc.ac.in/handle/2005/221.

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This thesis is devoted to the study and designs of two important proportional weirs having the discharge-head characteristics of Q α H 2/3 In the first design a geometrically simple weir in the form of a rectangular weir over a inverted V-notch (Chimney weir) is presented. This weir gives for all flows above a threshold depth a discharge proportional to H 2/3 within a maximum percentage error of ±1.5, (measured above a reference plane) within certain limits of head. Second design is concerned with the self-basing weir in which a portion of the weir above the crest acts as a base. This design is achieved by using the complementary weir profile of a Quadratic weir above the parabolic base which has the significant property of fast convergence. This weir gives discharge for all flows above the threshold depth, proportional to (head)2/3 measured above a reference plane, with increasing accuracy as head increases. Experiments with these two weirs confirm the theory by giving a constant average Coefficient of Discharge (Cd) of 0.62. The importance of these weirs as a sensitive discharge measuring device in field and laboratory is highlighted.
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Reddy, K. Ranga. « Study And Design Of Two-Thirds Power Weir ». Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/221.

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This thesis is devoted to the study and designs of two important proportional weirs having the discharge-head characteristics of Q α H 2/3 In the first design a geometrically simple weir in the form of a rectangular weir over a inverted V-notch (Chimney weir) is presented. This weir gives for all flows above a threshold depth a discharge proportional to H 2/3 within a maximum percentage error of ±1.5, (measured above a reference plane) within certain limits of head. Second design is concerned with the self-basing weir in which a portion of the weir above the crest acts as a base. This design is achieved by using the complementary weir profile of a Quadratic weir above the parabolic base which has the significant property of fast convergence. This weir gives discharge for all flows above the threshold depth, proportional to (head)2/3 measured above a reference plane, with increasing accuracy as head increases. Experiments with these two weirs confirm the theory by giving a constant average Coefficient of Discharge (Cd) of 0.62. The importance of these weirs as a sensitive discharge measuring device in field and laboratory is highlighted.
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3

Dabling, Mitchell R. « Nonlinear weir hydraulics ». Thesis, Utah State University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1584298.

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A hydraulically undersized control structure could result in water overtopping a dam or channel banks. To increase hydraulic capacity and reduce flooding risk, nonlinear spillways are frequently replacing linear weirs. This study investigates four subjects to further knowledge for two types of nonlinear weir, the piano key and labyrinth. Weir submergence is a condition when the downstream water level of a weir exceeds the weir crest elevation, and can influence the head-discharge relationship of the structure. The effects of submergence on laboratory-scale piano key weir head-discharge relationships were evaluated experimentally and compared to published submergence data for linear and labyrinth weirs. For relatively low levels of submergence, the piano key weir requires less upstream head relative to the labyrinth weir (<6%). This increase in efficiency was reversed at higher levels. Staged labyrinth weirs feature multiple weir segments with different crest elevations, which confine base flows and/or satisfy downstream discharge requirements. Head-discharge relationships for various laboratory-scale staged labyrinth weir configurations were established. The accuracy of a head-discharge predictive technique based upon superposition and traditional labyrinth weir empirical data was evaluated, and found to be generally within ?5%. The influence of linear, labyrinth, and staged labyrinth weir head-discharge characteristics on the outflow hydrograph behavior was evaluated by numerically routing various flood discharges through a fictitious reservoir; peak outflow, maximum water surface elevation, and required detention volume data are presented for each weir alternative. A staged labyrinth weir can be an effective alternative for decreasing the peak outflow hydrograph for frequent events, while increasing discharge for higher return period storm events. Approach flow perpendicular to the labyrinth weir centerline axis may not be possible in all situations. The head-discharge characteristics of a laboratory-scale labyrinth weir were evaluated with three different approach flow angles (0?, 15?, and 45?). For approach flow angles up to 15?, no measurable loss in discharge efficiency occurred. The discharge efficiency reduced as much as 11% for the 45? approach angle case. While all data presented are specific to the weir configurations and geometries tested, these data can be beneficial to the general understanding of nonlinear weirs.

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Tagwi, Dayton. « Inflatable weir hydraulics ». Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96686.

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Thesis (MEng)--Stellenbosch University, 2015.
ENGLISH ABSTRACT: General objective of the study This thesis aims to evaluate the hydraulics of an inflatable weir in its fully inflated position to the almost fully deflated position using different diameter circular weirs with varying discharges, by considering the change in the weir radius and the dynamic pressures on the weir. In the evaluation, three cylindrical weirs were installed in a 2m wide flume and tested over various discharges. Methodology The three weirs, one with a 300mm diameter, another with a 250mm diameter, and the last one with a 100mm diameter, were used to determine the effects of over flow water on the weir as seen in the different stages of the normal operation of an inflatable weir. Simulation involved measurement of the upstream and downstream water levels with the weir height involved at stable over flow conditions. Measurement of pressure variations was done on the weir faces with different water inflow rates to the test flume with three pressure sensors installed on each weir at 0°, 11.25° and 22.5° from the crest to the downstream. Additionally a single 0.15m radius weir was tested for pressures 67.5°, 78.75° and 90° from weir crest. Water level variation on the downstream of the weir was created by means of a variable tail gate to observe its effects. Results of the investigation The effects of upstream arches, stage, radius of curvature, discharge, pressure, energy losses over the weir and the downstream hydraulic jump were investigated in the inflation and deflation of the inflatable weir. The findings were as follows: ►Based on literature by Chanson and Montes (1998), Shabanlou et al. (2013), Schmockeret al. (2011) and Bahzad et al. (2010), upstream arches have insignificant influence onthe performance of the inflatable weir. There is rather reduced afflux due to the shape ofthe upstream of the weir from the Bernoulli’s equation. This shape of the upstream of theweir also contributes to the transport of sediments Gebhardt et al. (2012). ►Investigation of the discharge coefficient and factors influencing showed that: oAs the weir radius is reduced during the deflation, the unit discharge over each weirincreased with increase in head above the crest. oDischarge coefficient of the inflatable weir increases with the increase in head aboveweir crest, and the discharge coefficient is inversely proportional to the radius ofcurvature of the weir. ►Investigation of pressures on the downstream face of the weir models showed that: oThe negative (suction) pressure acting on the downstream face of the weir becomesincreasingly negative with increase in H/R values. oPoint of separation of nappe was seen with pulsations of pressure of the recordpressure. Generally, energy dissipation over the weir decreases with the decrease in the weir radius and the jump is more stable with the smallest circular weir and can be more accurately determined in the case of a small weir. Conclusions and Recommendations The inflatable weir has a high discharge at its fully inflated position. Its hydraulic performance is largely influenced by inflow head and is inversely proportional to the radius of curvature. Nappe pulsation as seen in the nappe vibrations can cause the vibration of weir. Future research on inflatable weirs should aim to monitor the negative pressure on measuring pressures further down the face of the weir because larger negative pressures are expected to develop after 90˚ as with this study.
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5

Dabling, Mitchell R. « Nonlinear Weir Hydraulics ». DigitalCommons@USU, 2014. https://digitalcommons.usu.edu/etd/2189.

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A hydraulically undersized control structure could result in water overtopping a dam or channel banks. To increase hydraulic capacity and reduce flooding risk, nonlinear spillways are frequently replacing linear weirs. This study investigates four subjects to further knowledge for two types of nonlinear weir, the piano key and labyrinth. Weir submergence is a condition when the downstream water level of a weir exceeds the weir crest elevation, and can influence the head-discharge relationship of the structure. The effects of submergence on laboratory-scale piano key weir head-discharge relationships were evaluated experimentally and compared to published submergence data for linear and labyrinth weirs. For relatively low levels of submergence, the piano key weir requires less upstream head relative to the labyrinth weir (<6%). This increase in efficiency was reversed at higher levels. Staged labyrinth weirs feature multiple weir segments with different crest elevations, which confine base flows and/or satisfy downstream discharge requirements. Head-discharge relationships for various laboratory-scale staged labyrinth weir configurations were established. The accuracy of a head-discharge predictive technique based upon superposition and traditional labyrinth weir empirical data was evaluated, and found to be generally within ±5%. The influence of linear, labyrinth, and staged labyrinth weir head-discharge characteristics on the outflow hydrograph behavior was evaluated by numerically routing various flood discharges through a fictitious reservoir; peak outflow, maximum water surface elevation, and required detention volume data are presented for each weir alternative. A staged labyrinth weir can be an effective alternative for decreasing the peak outflow hydrograph for frequent events, while increasing discharge for higher return period storm events. Approach flow perpendicular to the labyrinth weir centerline axis may not be possible in all situations. The head-discharge characteristics of a laboratory-scale labyrinth weir were evaluated with three different approach flow angles (0°, 15°, and 45°). For approach flow angles up to 15°, no measurable loss in discharge efficiency occurred. The discharge efficiency reduced as much as 11% for the 45° approach angle case. While all data presented are specific to the weir configurations and geometries tested, these data can be beneficial to the general understanding of nonlinear weirs.
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Anderson, Ricky M. « Piano Key Weir Head Discharge Relationships ». DigitalCommons@USU, 2011. https://digitalcommons.usu.edu/etd/880.

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A piano key (PK) weir is a type of nonlinear (labyrinth-type) weir developed specifically for free-surface flow control structures with relatively small spillway footprints. Currently, no generally accepted standard PK weir design procedure is available. This is due, in part, to the large number of geometric parameters and a limited understanding of their effects on discharge efficiency (discharge efficiency is quantified by the discharge coefficient of the standard weir equation). However, Hydrocoop, a non-profit French dam spillways association, has recommended a PK weir design and a head-discharge relationship specific to that geometry. To develop a better understanding of the effects of PK weir geometry on discharge efficiency, 13 laboratory-scale, 4-cycle PK and rectangular labyrinth weir configurations were tested. As a result, the influence of the following PK weir geometries and/or modifications on discharge efficiency were partially isolated: the inlet-to-outlet key width ratio, upstream, and downstream apex overhangs; sloped floors; raising the crest elevation via a parapet wall; fillets underneath the upstream overhangs; and the crest type. The physical model test matrix also included a PK weir configuration consistent with the Hydrocoop-recommended design. From the experimental results, the appropriateness of the Hydrocoop-recommended head-discharge relationship was evaluated, along with the discharge coefficient behavior associated with the standard weir equation. Finally, trapezoidal labyrinth weirs were compared to PK weirs to make a relative comparison of nonlinear weir discharge efficiency; comparisons were made considering crest length and structure footprint.
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Shaw, Edward Alan. « Weir management : challenges, analysis and decision support ». Thesis, University of Sheffield, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.578054.

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If humanity is to make the best of this planet then it is crucial that we develop the capacity to implement the most effective environmental management practices. Essential is a holistic approach to management, as is advocated by integrated catchment management (ICM), which proposes that catchment management issues will be best dealt with when interventions are planned together at the catchment scale and all stakeholder interests are given consideration during decision making. The issue of weir modification is a good example of a problem that would benefit from these principles. Many stakeholder interests are affected by weir modification, and if effective and fair weir modification decisions are to be made, all must be used to evaluate alternative weir modification options. So that decision makers can make the most of the synergies and avoid the conflicts that can occur between interventions, they need to know how multiple weir modifications interact. To do this decision makers must be able to manage and utilise a large amount of information and use it to help them make effective decisions. The objective of the research presented in this thesis is to develop an approach to the management of weirs in the Don Catchment that is holistic both a spatial sense and in terms of the assessment of alternative management options. An evaluatory framework for weir modifications is formulated by adapting published typologies of river ecosystem services (ESs). The prediction of how catchment interventions affect sociocultural ESs is recognized as a particularly challenging to the application of this framework because their qualitative and subjective nature makes them hard to predict. Bayesian Networks (BNs) are identified as a potential solution as they use probabilities to describe the relationships between variables. A BN was built to predict how weir modification affected weir danger and weir fun for canoeists by utilising the knowledge of canoeing groups. It is concluded that despite a number of caveats, BNs offer a potentially important method for allowing sociocultural ESs to be predicted in decision making processes. The consideration ofthe complex interdependencies multiple weir modifications can have is recognised as another of the challenges facing weir management decision making. A spatially explicit modelling approach is developed that can account for the interactive effect multiple weir modifications have on river connectivity for several river species in the Don Catchment. Expert judgement and hydrological modelling are used to discriminate between different levels of habitat quality for European eel (Anguilla anguilla) and Atlantic salmon (Safrna safar). Several strategies to increase connectivity in the Don Catchment were explored. It was found that each had its own set of winners and losers, indicating trade-offs between species need to be considered when planning connectivity enhancements. The modelling approach shows the interdependent effects of weir modifications are vet: important in determining habitat accessibility, particularly the cumulative effect of multiple fish passes.
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8

Harwood, Jessica Lynn. « Taunton Weir renovation project : independent project proposal / ». View online version, 2007. http://digitalcommons.rwu.edu/archthese/7/.

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9

Papoutsi-Psychoudakis, S. « Flow over a sharp-crested horizontal weir ». Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355890.

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10

Rayner, Jonathan Richard. « Generic dreaming : the films of Peter Weir ». Thesis, University of Sheffield, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388812.

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Livres sur le sujet "Weir"

1

Peter Weir. Milano : Il castoro, 2011.

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2

Dramatists Play Service (New York, N.Y.), dir. The weir. New York : Dramatists Play Service, Inc., 1998.

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3

Theatre, Royal Court, et Jerwood Foundation, dir. The weir. [London : Nick Hern Books, 1998.

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4

McPherson, Conor. The weir. [London : Nick Hern Books, 1998.

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5

Theatre, Royal Court, dir. The weir. London : Nick Hern Books in association with the Royal Court Theatre, 1998.

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6

Louis, Stevenson Robert. Weir of Hermiston. Edinburgh : Edinburgh University Press, 1995.

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1931-, Miller Karl, dir. Weir of Hermiston. London : Penguin Books, 1996.

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Estensen, Jeffrey L. Kanektok River weir 2003. Anchorage, Alaska : Alaska Dept. of Fish and Game, Commercial Fisheries Division, Arctic-Yukon-Kuskokwim Region, 2004.

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Tom Weir : An anthology. Dingwall, Ross-shire, Scotland : Sandstone Press, 2013.

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Hodson, Janice. Weir House historic furnishings report addendum & implementation plan : Weir Farm National Historic Site. Charlestown, Mass.] : Northeast Museum Services Center, National Park Service, 2009.

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Chapitres de livres sur le sujet "Weir"

1

Gooch, Jan W. « Weir ». Dans Encyclopedic Dictionary of Polymers, 808. New York, NY : Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12774.

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« Weir ». Dans Encyclopedic Dictionary of Polymers, 1063. New York, NY : Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-30160-0_12526.

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« weir ». Dans Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 1522. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_231175.

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Zhang, Yaoxin, Yafei Jia, Keh-Chia Yeh et Chung-Ta Liao. « Erosion Control at Downstream of Reservoir Using In-stream Weirs ». Dans Hydraulic Structures - Impact on River Flow and Sediment Transport-Dimensioning [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.108169.

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As low-head hydraulic structures, instream weirs are built across rivers to control the upstream water surface elevation and the downstream flow conditions. This chapter presents a study of erosion control using instream weirs at downstream of a reservoir; JiJi Weir was built across the longest river in Taiwan, Chuoshui Creek, a mountainous river with steep slopes. Due to the easy-to-be-eroded fine lithology layers of mud, shiver, and sandstones on channel bed, the downstream of JiJi Weir had suffered from severe channel incision and head-cut development problems, which greatly threatens the integrity of the dam. To protect the JiJi Weir and its downstream channel from serious channel erosions, the Water Resources Agency (WRA) of Taiwan proposed erosion control plans that multiple instream weir structures were to be installed along the downstream channel of JiJi Weir. A three-dimensional (3D) numerical model, CCHE3D model with capabilities of simulating bedrock erosions, was used to evaluate those erosion control plans and thus explore for the optimal design.
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« fascine weir ». Dans Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 510. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_60322.

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« fayoum weir ». Dans Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 512. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_60427.

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« log weir ». Dans Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 816. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_122155.

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« blind weir ». Dans Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 138. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_22116.

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« waste weir ». Dans Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 1503. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_230284.

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« temporary weir ». Dans Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 1379. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_200483.

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Actes de conférences sur le sujet "Weir"

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Burtsev, Anton, Nikhil Mishrikoti, Eric Eide et Robert Ricci. « Weir ». Dans the Seventh Workshop. New York, New York, USA : ACM Press, 2013. http://dx.doi.org/10.1145/2525528.2525537.

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Wang, L., B. Melville et H. Friedrich. « The influence of upstream weir slope on live-bed scour at submerged weir ». Dans The 8th International Conference on Scour and Erosion. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742 : CRC Press, 2016. http://dx.doi.org/10.1201/9781315375045-116.

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Jamil, Ary, et Diyar Qader. « Experimental Study for Measuring Flow Rate Using Broad-Crested Weirs ». Dans 4th International Conference on Architectural & Civil Engineering Sciences. Cihan University-Erbil, 2023. http://dx.doi.org/10.24086/icace2022/paper.881.

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The broad-crested weir consider as a hydraulic components frequently used in irrigation as well as in drainage networks and water treatment plants. A rectangular broad-crested weir has various merits where it is essential to determine the measurement of a variety of discharges on natural streams. The laboratory measures used in this study were taken on a rectangular broad-crested weir shape at various flow rates to test the flow pattern above a rectangular broad-crested weir. Furthermore, a formula to calculate the discharge coefficient of rectangular broad-crested weirs is also offered to compare the flow rate obtained by using the weirs with actual flow meter readings. As a result, the outcomes of the study indicated the coefficient of discharge (C_d) value increases with increasing the ratio (H/P_w) for each flow state.
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Onitsuka, Kouki, Juichiro Akiyama, Yohei Iiguni, Daisuke Kiuchi et Noriaki Kawara. « Flow Stability in Pool-and-Weir Fishways, Plunging and Streaming Flows ». Dans ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37331.

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In Japanese rivers, there are many river constructions, i.e., dams, weirs, drops, for the purpose of flood control. Fishways are river constructions which facilitate migration of fish past dams and weirs. There are a lot of fishway types such as pool-and-weir type, stream type, operation type and so on (see Nakamura, 1995). The pool-and-weir fishway is typical type in Japanese rivers. There are three types of flow regimes in pool-and-weir fishways such as a plunging flow, streaming flow and intermixed flow of plunging and streaming flows. Rajaratnam et al. (1988) proposed a prediction formula of these flow regimes. However, this formula has no physical meaning. Further the accuracy of formula is not high. In this study, the criterion formula, which can predict the flow regime in the pool-and-weir fishway, is suggested semi-theoretically. The experiments were conducted with changing the aspect ratio and discharge in the pool-and-weir fishway. The water surface profiles were measured with a point gauge and also two components velocities were measured with a 2-D electromagnetic current meter. A new criterion formula, which is able to predict the flow formation, is proposed.
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Keller, Robert. « Fish Movement and Weir Drown-Out ». Dans World Environmental and Water Resources Congress 2010. Reston, VA : American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41114(371)156.

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Raheem, Adil, et Tara Aurahman. « Hydraulic performance of Piano Key Weir ». Dans Proceedings of the 1st International Multi-Disciplinary Conference Theme : Sustainable Development and Smart Planning, IMDC-SDSP 2020, Cyperspace, 28-30 June 2020. EAI, 2020. http://dx.doi.org/10.4108/eai.28-6-2020.2297967.

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Varyu, David, Kendra Russell et Elaina Holburn. « Quantitative Evaluation of Rock Weir Field Performance ». Dans World Environmental and Water Resources Congress 2009. Reston, VA : American Society of Civil Engineers, 2009. http://dx.doi.org/10.1061/41036(342)329.

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Hoffman, Kurtis Zachary, John Hamilton Tellers et Robert Howard Krcek. « Recent Stimulation Results in the Weir Sandstone ». Dans SPE Eastern Regional Meeting. Society of Petroleum Engineers, 2011. http://dx.doi.org/10.2118/148968-ms.

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Ansar, Matahel, et Juan A. Gonzalez-Castro. « Submerged Weir Flow at Prototype Gated Spillways ». Dans World Water and Environmental Resources Congress 2003. Reston, VA : American Society of Civil Engineers, 2003. http://dx.doi.org/10.1061/40685(2003)198.

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Shah, Mahesh Chandra, et Keerat Kumar Gupta. « Review on flow characteristics of gabion weir ». Dans INTERNATIONAL SCIENTIFIC AND PRACTICAL CONFERENCE “TECHNOLOGY IN AGRICULTURE, ENERGY AND ECOLOGY” (TAEE2022). AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0105385.

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Rapports d'organisations sur le sujet "Weir"

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Vanden-Broeck, Jean-Marc, et Joseph B. Keller. Weir Flows. Fort Belvoir, VA : Defense Technical Information Center, mars 1986. http://dx.doi.org/10.21236/ada167495.

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Stockstill, Richard, Christopher Kees et Charlie Berger. Modeling Free-Surface Flow Over a Weir. Fort Belvoir, VA : Defense Technical Information Center, août 2006. http://dx.doi.org/10.21236/ada455417.

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Campbell, J. E., I. McMartin et M. Millard. Surficial geology, Sturgeon-Weir River area, Saskatchewan. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1997. http://dx.doi.org/10.4095/209265.

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WATERWAY SIMULATION TECHNOLOGY CLINTON MS. Physical Model Test for Bendway Weir Design Criteria. Fort Belvoir, VA : Defense Technical Information Center, octobre 2002. http://dx.doi.org/10.21236/ada408861.

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Crum, Kevin, Jack Sands, Richard Amacher, Steven Sipe, Paul Muller, Lynn Reese et Duane West. Little Goose Lock and Dam Removable Spillway Weir. Fort Belvoir, VA : Defense Technical Information Center, août 2007. http://dx.doi.org/10.21236/ada472061.

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Smith, Maureen. Habitat Evaluation Procedures (HEP) Report ; Weig [Weir] Property Pend Oreille National Wildlife Refuge, Technical Report 1997-1998. Office of Scientific and Technical Information (OSTI), février 1998. http://dx.doi.org/10.2172/947096.

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Fuller, Billy D. Upper Guadalupe River Flood Control Weir, San Jose, California. Fort Belvoir, VA : Defense Technical Information Center, novembre 2003. http://dx.doi.org/10.21236/ada419476.

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Crum, Kevin. McNary Lock and Dam Temporary Spillway Weir (TSW) II. Fort Belvoir, VA : Defense Technical Information Center, août 2007. http://dx.doi.org/10.21236/ada472011.

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Weir, Gary E. Oceanography : The Making of a Science - Oral History Component [Weir]. Fort Belvoir, VA : Defense Technical Information Center, septembre 2000. http://dx.doi.org/10.21236/ada609774.

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W.J.Stone et D.L.Newell. Installation of the Monitoring Site at the Los Alamos Canyon Low-Head Weir. Office of Scientific and Technical Information (OSTI), août 2002. http://dx.doi.org/10.2172/810968.

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