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Dissertations / Theses on the topic 'Weirs'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Nalder, Guinevere Vivianne. "Submerged Thin Plate Weirs With Unequal Upstream and Downstream Beds." The University of Waikato, 2006. http://hdl.handle.net/10289/2383.

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This thesis describes a short study to examine the behaviour of submerged flow over a thin plate weir with differing upstream and downstream bed levels i.e. an unequal bed weir as opposed to an equal bed weir where the upstream and downstream beds are at the same level. As submerged weir flow is a function of downstream conditions, it was thought that a lower downstream bed would make submerged flow over the weir easier, This is turn suggested that; The shape of the upstream head (Hu) vs downstream head (Hd) graph would change, being initially more steep in the unequal bed case. The Froude

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2

Crookston, Brian Mark. "Labyrinth Weirs." DigitalCommons@USU, 2010. https://digitalcommons.usu.edu/etd/802.

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Labyrinth weirs are often a favorable design option to regulate upstream water elevations and increase flow capacity; nevertheless, it can be difficult to engineer an optimal design due to the complex flow characteristics and the many geometric design variables of labyrinth weirs. This study was conducted to improve labyrinth weir design and analyses techniques using physical-model-based data sets from this and previous studies and by compiling published design methodologies and labyrinth weir information. A method for the hydraulic design and analyses of labyrinth weirs is presented. Disch

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3

Yilmaz, Aslican Nazli. "Hydraulic Characteristics Of Tyrolean Weirs." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612780/index.pdf.

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Tyrolean type water-intake structures are widely used on mountain rivers to provide water to hydropower stations. The main concern encountered in these kinds of structures is the amount of water diverted from the main channel and sediment carried by this flow. The diverted flow should not be less than the design discharge of the hydropower station and the amount of the sediment entering the hydraulic system should be minimum. In this study a physical model of a Tyrolean weir was constructed at the Hydromechanics Laboratory and by varying the dimensions of the various components of this system<

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4

Solis, Suraye Rori. "Estimating Flow Through Rock Weirs." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/90401.

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Rock weirs are small dam-like structures composed of large loose rock commonly found in ecological engineering design. By appearing more natural than concrete structures, rock weirs are preferred for use as hydraulic control structures in river engineering, stormwater management, and constructed wetlands. Rock weirs increase hydraulic head upstream, and facilitate fish passage, channel stabilization, floodplain reconnection, and in-stream habitat creation. When used in constructed wetlands, rock weirs play a valuable role in developing appropriate wetland hydrology. Although rock weirs are co

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5

Tingey, Samuel Egnew. "Discharge Coefficients of Oblique Weirs." DigitalCommons@USU, 2011. https://digitalcommons.usu.edu/etd/1010.

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Oblique weirs are those weirs placed at an angle with respect to the channel centerline. They can be used in canal applications where more discharge is needed, but there is limited freeboard. The discharge coefficients were determined for 54 different weirs by measuring total head for various flows over each weir. These weirs included sharp, half round and quarter-round-crested weirs. There were 18 weirs for each crest shape with three weir heights for each angle tested. The oblique angles tested were 10°, 15°, 25°, 45°, 60°, and 90° with respect to the channel centerline, with the nominal wei

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6

Christensen, Nathan A. "Flow Characteristics of Arced Labyrinth Weirs." DigitalCommons@USU, 2012. https://digitalcommons.usu.edu/etd/1367.

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The need to accommodate larger reservoir discharge events has prompted the improvement or replacement of existing spillways. One possible spillway modification is the use of an in-reservoir arced labyrinth weir in place of a linear weir. Arced labyrinth weirs can increase crest length (more cycles) and have improved hydraulic efficiency in non-channelized approach flow applications, compared to traditional labyrinth weir applications. In this study, arced labyrinth weir flow characteristics were observed for eleven different laboratory-scale model geometries at the Utah Water Research Laborato

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7

Thompson, Seth D. "Reservoir Applications of Arced Labyrinth Weirs." DigitalCommons@USU, 2019. https://digitalcommons.usu.edu/etd/7700.

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In recent years, magnitudes of flood estimates used in hydraulic design have increased for many reservoirs. Consequently, many existing spillways are now deficient as they do not meet current discharge capacity requirements. To rehabilitate existing, fixed-width spillways, labyrinth weirs are often viable solutions. For reservoir applications, arcing labyrinth weirs into the reservoir increases hydraulic efficiency. This results from better cycle orientation to the approaching flow field. This study supplements available arced labyrinth weir hydraulic data by observing flow characteristics of

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8

Baumgartner, Lee Jason, and n/a. "Effects of weirs on fish movements in the Murray-Darling Basin." University of Canberra. Resource, Environmental & Heritage Sciences, 2005. http://erl.canberra.edu.au./public/adt-AUC20051129.142046.

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Dams and weirs are widely implicated in large-scale declines in both the range and abundance of aquatic fauna. Although many factors are involved, such declines are commonly attributed to the prevention or reduction of migration, reductions in available habitat, alteration of natural flow regimes and changes to physicochemical characteristics. In Australia, studies into the ecological effects of these impacts are limited, and have concentrated mainly on species of recreational and commercial importance. Subsequently, the adverse effects of dams and weirs, and suitable methods of mitigation, re

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9

Sisman, H. Cigdem. "Experimental Investigation On Sharp Crested Rectangular Weirs." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610919/index.pdf.

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Sharp crested rectangular weirs used for discharge measurement purposes in open channel hydraulics are investigated experimentally. A series of experiments were conducted by measuring discharge and head over the weir for different weir heights for full width weir. It is seen that after a certain weir height, head and discharge relation does not change. Hence a constant weir height is determined. For that height<br>discharge and head over the weir are measured for variable weir width, starting from the full width weir to slit weir. Description of the discharge coefficient valid for the f

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10

Gharahjeh, Siamak. "Experimental Investigation On Sharp Crested Rectangular Weirs." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614379/index.pdf.

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This study is an experimental research to formulate the discharge over sharp-crested rectangular weirs. Firstly, a series of measurements on different weir heights were conducted to find the minimum weir height for which channel bed friction has no effect on discharge capacity. After determining the appropriate weir height, weir width was reduced to collect data on discharge-water head over weir relationship for a variety of different weir openings. Then, the data was analyzed through regression analysis along with utilization of global optimization technique to reach the desired formulation f

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11

Tsang, Chau. "Hydraulic and aeration performance of labyrinth weirs." Thesis, Queen Mary, University of London, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301727.

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12

Johnson, Michael Clyde. "Discharge Coefficient Scale Effects Analysis for Weirs." DigitalCommons@USU, 1996. https://digitalcommons.usu.edu/etd/7604.

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Much work has been published regarding discharge coefficients for various weir structures. What has not been published to the same extent are the effects of model scale associated with the weirs being studied. If laboratory weirs are too small, scale effects can affect the magnitude of the discharge coefficient. These errors may be significant if the weir serves as a control structure for an emergency spillway. It is imperative that discharge be accurately predicted to enable safe design and operation. Numerical and physical means were employed to analyze the effects of scale associated with F

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13

O'Keefe, Laura. "Assessing the influence of low head weirs and low head 'on weir' hydropower on the phytobenthic biofilm." Thesis, Lancaster University, 2017. http://eprints.lancs.ac.uk/88919/.

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In recent years there has increased interest in low head ‘on weir’ hydro across the UK. This directly corresponds to carbon reduction targets, renewable energy targets and financial incentives directed at renewable energy generating schemes. Despite increased interests, current understandings of the aquatic implications of low head ‘on weir’ hydro are unclear and not one in field investigation has been carried out at an existing scheme. Yet with important environmental legislation preventing the deterioration of ecological river quality, mainly the Water Framework Directive (WFD), there is an

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14

Aminipouri, Bahram. "Developments in the hydraulic design of labyrinth weirs." Thesis, University of Newcastle Upon Tyne, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308435.

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15

Amaral, Susana Cristina Amador Dias. "Permeability of small weirs for upstream fish passage." Doctoral thesis, ISA, 2020. http://hdl.handle.net/10400.5/21202.

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16

Kamula, R. (Riitta). "Flow over weirs with application to fish passage facilities." Doctoral thesis, University of Oulu, 2001. http://urn.fi/urn:isbn:9514259777.

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Abstract Fishways are hydraulic structures designed to dissipate the energy of flowing water in order to decrease water velocities and increase water depths. The history of fishways is long, the first written remarks date back to the 17th century. Fishway hydraulics, however, have been intensively studied only starting since the 1980's. Fishways have been classified into three main categories according to their hydraulic characteristics: pool-and-weir, vertical slot, and Denil fishways. Fishways are hydraulically complex structures, and thus designing tools for different fishway types ha

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17

Eftekharzadeh, Shahriar. "Canal side weirs for water delivery to irrigation furrows." Thesis, The University of Arizona, 1985. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_1985_139_sip1_w.pdf&type=application/pdf.

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18

SINGH, KANCHAN. "STUDY OF AERATION EFFICIENCY OVER THE PIANO KEY WEIRS." Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2021. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18799.

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Aeration is the process of increasing the dissolved oxygen content of water, which is an important water quality parameter for the survival of flora and fauna on this planet. The dissolved oxygen level can be increased using hydraulic structures or by installing mechanical aerators. Hydraulic structures proved to be an economical and efficient way of enhancing the aeration process, thereby increasing the dissolved oxygen in the water stream. It develops large amounts of air bubbles; as a result, contact surface area increases, and hence the water-air -mass transfer accelerates. Weirs are

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19

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 desig

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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

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21

Yeke, Yazdandoost Farhad. "Spatially varied hydraulic flow through open channels." Thesis, University of Bradford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364917.

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22

Willis, Mark Colton. "The electronic automation of the weirs on the River Thames." Thesis, University of Reading, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314791.

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23

Turan, Kamil Hakan. "Development Of A Computer Program For Optimum Design Of Diversion Weirs." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/12605490/index.pdf.

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A diversion weir is a headwork facility built across a river to raise the water level and to divert water for various purposes, such as irrigation, hydropower generation, etc. Diversion weirs with sidewise intakes are widely used in plain rivers. They are composed of many structural components which are designed for different purposes. In this thesis, a Windows-based, visual, user friendly program named WINDWEIR was developed in Visual Basic.NET programming language for the optimum design of a diversion weir with sidewise intake. It determines the overall dimensions of each of the components o

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24

Littlejohn, Alex. "Nutrient mitigation capacity of low-grade weirs in agricultural drainage ditches." Mississippi State University, 2013.

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25

Dias, Alessandro. "Análise do desempenho hidráulico de uma soleira lateral através de CFD." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3147/tde-01092011-154345/.

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A soleira lateral desempenha um papel importante nos reservatórios de detenção/ retenção (off-line), atuando na captação das vazões afluentes e evitando possíveis enchentes, problema em destaque nos períodos chuvosos das principais capitais brasileiras. Um melhor entendimento do seu comportamento hidráulico possibilitará o desenvolvimento de estruturas laterais mais eficientes. O presente trabalho tem como objetivo criar um modelo da soleira lateral através da tecnologia CFD (Dinâmica dos Fluidos Computacional) e validá-lo através de experimentos em modelo reduzido do Laboratório de Hidráulica

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Sahiner, Halit. "Hydraulic Characteristics Of Tyrolean Weirs Having Steel Racks And Circular-perforated Entry." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614247/index.pdf.

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Tyrolean type water-intake structures are commonly used on mountain rivers to supply water to hydropower stations. The amount of water to be diverted from the main channel is the major concern in these kind of structures and should not be less than the design discharge. In this study a physical model of a Tyrolean type water-intake structure was built at the laboratory and the diverted flow from the main channel through the intake structure having steel racks and perforated plates of different types were measured. The experiments were conducted in two stages. In the first stage the tests were

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27

Wessels, P. (Pieter). "The calibration of compound crump and sharp-crested gauging weirs in South Africa." Thesis, Stellenbosch : Stellenbosch University, 1996. http://hdl.handle.net/10019.1/55260.

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Dissertation (PhD)--Stellenbosch University, 1996.<br>One copy microfiche.<br>Some digitised pages may appear illegible due to the condition of the original microfiche.<br>ENGLISH ABSTRACT: The present network of now gauging stations in South Africa has grown from isolated observations on an ad extensive is to an extensive network of stations across the country. Standardised gauging stations to suit local conditions have been developed which include purposely desigll4:d compound weirs. Nearly all. compound gauging weirs In South Africa have. for practical reasons. been constructed withou

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Mendes, João Batista. "Soleira elíptica-circular." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/3/3147/tde-19082008-171341/.

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Este trabalho propõe uma soleira assimétrica elíptica-circular com apenas dois pontos de descontinuidade, com parâmetros geométrico associados à vazão específica de projeto, com possibilidade de padronização e cujas características hidráulicas (linha d´água, pressões, coeficiente de vazão) podem ser determinadas teoricamente. Um sistema de equações diferenciais parciais permite o desenvolvimento de um modelo computacional para determinação dos valores teóricos dessas características. A validação dos valores teóricos das características hidráulicas da soleira por um modelo computacional foi rea

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Canto, R. R. "The rating of compound sharp-crested weirs under modular and non-modular flow conditions." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/52005.

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Thesis (MEng)--University of Stellenbosch, 2000.<br>ENGLISH ABSTRACT: The compound sharp-crested weir, which consists of two or more notches at different elevations, is the most common type of flow gauging structure found in South Africa. The Department of Water Affairs and Forestry (DWAF) is responsible for the operation of these weirs. They are currently experiencing the following problems regarding flow measurement with compound sharp-crested weirs: 1. During free-flow conditions, also known as modular flows, there is uncertainty about the accuracy of the discharge formulas. Although

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Bruce, H. G. S. "The rating of sluicing flumes in combination with sharp-crested and crump weirs under modular and non-modular flow conditions." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/52006.

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Thesis (MEng)--University of Stellenbosch, 2000.<br>ENGLISH ABSTRACT: As part of a previous WRC project, three types of sluicing flumes were developed for use in compound weirs in combination with sharp-crested and crump weirs, (Rossouw et al., 1998). These sluicing flumes have several advantages which make them ideal structures for flow measurement in South African rivers. These are a high modular limit, stable modular flow characteristics, an ability to measure a wide range of flows accurately, as well as good sediment handling characteristics. These three flumes have been calibrated

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Heiner, Bryan J. "Parshall Flume Staff Gauge Location and Entrance Wingwall Discharge Calibration Corrections." DigitalCommons@USU, 2009. https://digitalcommons.usu.edu/etd/480.

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The Utah Water Research Laboratory, in conjunction with the State of Utah, initiated a study to determine the accuracy of a wide variety of flow measurement devices in Utah. The project selected 70 sites with flow measurement devices throughout the state. During the assessment each device had its physical condition and flow measurement accuracy documented. Although a wide variety of flow measurement devices were tested, the majority were Parshall flumes. Many of the assessed Parshall flumes were not measuring flow to the specified ±5 percent design accuracy. Problems in flow measurement were d

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Seamons, Tyler Robert. "Labyrinth weirs| A look into geometric variation and its effect on efficiency and design method predictions." Thesis, Utah State University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1584339.

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<p>The rehabilitation of dams often requires spillway capacity upgrades. Replacing a less hydraulically efficient linear weir with a labyrinth weir can be an effective way to increase discharge efficiency (discharge at a given upstream head) for a fixed-width channel. Labyrinth weirs are linear weirs folded in plan view to increase total spillway crest length (which in turn increases discharge efficiency within a channel). Labyrinth weirs potentially have limitless geometric configurations. This study was performed to analyze the effects of varying certain geometric parameters on discharge eff

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Maritz, Ashley Amy. "Investigating the limitations of the discharge-head relationship of compound crump weirs exceeding their hydraulic capacities." Diss., University of Pretoria, 2020. http://hdl.handle.net/2263/79278.

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The variability of the South African (SA) climate results in abrupt changes in river discharge rates. Compound weirs have been implemented as an attempt to ensure accurate discharge calculations over an extended, but limited, range of flows. It would be financially and practically impossible to design compound weirs that can measure the entire range of flow rates that are experienced in SA rivers to the same degree of accuracy. Extensive research on the accuracy of weirs, within their intended hydraulic capacity, has been done over the years. However, when weirs operate above this capacity, th

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Seamons, Tyler Robert. "Labyrinth Weirs: A Look Into Geometric Variation and Its Effect on Efficiency and Design Method Predictions." DigitalCommons@USU, 2014. https://digitalcommons.usu.edu/etd/2155.

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The rehabilitation of dams often requires spillway capacity upgrades. Replacing a less hydraulically efficient linear weir with a labyrinth weir can be an effective way to increase discharge efficiency (discharge at a given upstream head) for a fixed-width channel. Labyrinth weirs are linear weirs folded in plan view to increase total spillway crest length (which in turn increases discharge efficiency within a channel). Labyrinth weirs potentially have limitless geometric configurations. This study was performed to analyze the effects of varying certain geometric parameters on discharge effici

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35

Carlson, Leah. "A tool for monitoring the effectiveness of V-weirs for over-wintering salmonids in the Crowsnest River." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0016/MQ48252.pdf.

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Nemura, Adrienne Denise. "Effectiveness of weirs on the New River in retarding rapid releases from Claytor Lake Dam at Big Falls." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/101138.

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Reservoir releases for power generation often cause rapidly fluctuating water levels and increased velocities in certain downstream sections of rivers. These conditions and the natural geometry of the river can render certain sections of the river dangerous for recreation. Although public utilities take precautionary safety measures immediately downstream of the dam, their measures further downstream have been limited, if not non-existent. The placement of weirs between the dam and dangerous sections would retard the flow—slowing the rise in water levels and decreasing velocities at predetermi

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Kocman, Tomáš. "Návrh vakového jezu v Oslavanech." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226157.

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This thesis describes the current state of the river Oslava in Oslavany design and reconstruction of the existing fixed weir in the affected location. As a best alternative reconstruction of the existing fixed weir reconstruction was chosen the hard threshold floating weir inflatable weirs. The next part of the thesis describes the proposed solution, and the last part of the thesis deals with the assessment of the proposed solutions.

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Curtis, Kedric W. "Size Scale Effects on Linear Weir Hydraulics." DigitalCommons@USU, 2016. https://digitalcommons.usu.edu/etd/5046.

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Linear weirs are a common hydraulic structure that have been used for centuries with many different applications. One characteristic of weirs that is particularly useful is the head-discharge relationship where the discharge over the weir is directly related to the upstream water depth above the crest. In general, the head-discharge relationship for a weir is determined experimentally in laboratories using geometrically similar models. Due to space, time, money, and discharge capacity limitations at water laboratories, creating full scale models is not always a feasible option when determining

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Hoffmann, Patrícia [UNESP]. "Análise temporal da composição, abundância, diversidade dos Cladocera e crescimento alométrico da Daphnia spp. O. F. Müeller, 1785 na Lagoa do Camargo, lateral ao Rio Paranapanena em sua zona de desembocadura na Represa do Jurumirim." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/106469.

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Made available in DSpace on 2014-06-11T19:35:41Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-06-04Bitstream added on 2014-06-13T19:05:52Z : No. of bitstreams: 1 hoffmann_p_dr_botib.pdf: 1460856 bytes, checksum: f067ccec9160ccbd165f626114c30a8f (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>O objetivo deste capítulo foi determinar a distribuição temporal de Cladocera na Lagoa do Camargo, lateral ao Rio Paranapanema em sua zona de desembocadura no Reservatório de Jurumirim, analisando a flutuação da composição, abundância e diversidade da comunidade e

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Hoffmann, Patrícia. "Análise temporal da composição, abundância, diversidade dos Cladocera e crescimento alométrico da Daphnia spp. O. F. Müeller, 1785 na Lagoa do Camargo, lateral ao Rio Paranapanena em sua zona de desembocadura na Represa do Jurumirim /." Botucatu, 2012. http://hdl.handle.net/11449/106469.

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Orientador: Raoul Henry<br>Coorientador: Maria Stela Maioli Castilho Noll<br>Banca: Lourdes Maria Abdu El-Moor Loureiro<br>Banca: Eliana Aparecida Panarelli<br>Banca: Maria José dos Santos Wisniewski<br>Banca: Paulina Maria Maia Barbosa<br>Resumo: O objetivo deste capítulo foi determinar a distribuição temporal de Cladocera na Lagoa do Camargo, lateral ao Rio Paranapanema em sua zona de desembocadura no Reservatório de Jurumirim, analisando a flutuação da composição, abundância e diversidade da comunidade e sua relação com fatores ambientais. Quinzenalmente, entre junho de 2008 e maio de 2009,

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Amanian, Nosratollah. "Performance and Design of Labyrinth Spillway." DigitalCommons@USU, 1987. https://digitalcommons.usu.edu/etd/7658.

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In recent years, the general interest in the safety of dams and reservoirs has grown appreciably. This research describes the application and design of labyrinth weirs to improve the performance of existing reservoirs and also to be used for the construction of new dams. The parameters that can affect the performance of labyrinth weirs are discussed. Tests were conducted on normal linear weirs with four different crest shapes to determine the rate of change of discharge coefficient when each type of weir is used. It is found that weirs with rounded-crest shape can pass more flow than other typ

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Gunther, U. K. (Uwe Karsten). "The application of Doppler velocity meters in the measurement of open channel discharges." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52485.

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Thesis (MEng)--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: This report deals with the use of Doppler meters to measure flow velocities and hence discharges in streams. The Doppler meter measures the shift in frequency of an acoustic wave, which it emits and then becomes reflected by a moving particle. The reading is converted into a velocity by dividing the shifted frequency by a calibration constant. The particles that reflect the signal need to follow the flow sufficiently closely so that their velocity may be assumed equal to the flow velocity. A previous study on the use

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Byram, Robert Scott. "Brush fences and basket traps : the archaeology and ethnohistory of tidewater weir fishing on the Oregon Coast /." online access from Digital Dissertation Consortium access full-text, 2002. http://libweb.cityu.edu.hk/cgi-bin/er/db/ddcdiss.pl?3055675.

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Nunes, Carolina Cadete Leite de Sampaio. "Avaliação do funcionamento da passagem para enguias do Açude-Ponte de Coimbra." Master's thesis, Universidade de Évora, 2017. http://hdl.handle.net/10174/21229.

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Nesta dissertação, procedeu-se à avaliação do funcionamento de uma passagem para enguias (PPEnguias), instalada no Açude-Ponte de Coimbra, no rio Mondego, visando facilitar a passagem de juvenis desta espécie para montante. As amostragens realizadas permitiram verificar que a época de migração das enguias com um comprimento inferior a 200mm atinge o pico na primavera e no verão; o troço a jusante do Açude-Ponte é caracterizado por maior número de indivíduos e de menor tamanho, e os troços a montante por menos animais e de maior comprimento. Esta diferença reforça o impacto do obstáculo na migr

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Morais, JoÃo Silvio Dantas de. "Use for analysis hydrossedimentological and environmental impacts after CastanhÃo dam construction - downstream of the mouth of the Rio Jaguaribe-CE." Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15436.

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nÃo hÃ<br>O barramento do fluxo natural do rio Jaguaribe, com a construÃÃo da barragem do CastanhÃo, no limite entre o mÃdio e baixo curso, inserido na polÃtica de gestÃo das Ãguas do Estado do CearÃ, alterou consideravelmente a vazÃo, que no inÃcio do sÃculo XX era de 200 m/s, para menos de 40 m/s nos dias atuais. No entanto, as modificaÃÃes nÃo sÃo apenas da Ãgua barrada, mas na interrupÃÃo do fluxo de sedimentos, acarretando alteraÃÃes no ciclo hidrosedimentolÃgico e nas feiÃÃes geomorfolÃgicas. Associados ao processo de aÃudagem estÃo os impactos das alteraÃÃes e mudanÃas no quadro ambient

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Luz, Glauco de Oliveira da. "COMPARAÇÃO ENTRE DOIS SISTEMAS HIDRÁULICOS DE MEDIÇÃO DE AGUA DE IRRIGAÇÃO DE ARROZ." Universidade Federal de Santa Maria, 2011. http://repositorio.ufsm.br/handle/1/7760.

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The irrigated farm crops are the main users of water. With this, in places where there is a water shortage to attend all sorts of use, this kind of activity is characterized like as a potentially conflicting, once that to produce one hectare of rice, are necessary thousands cubic meters of water. To work out this conflict, many actions are been developed, as giving rights and tax to use water. Although, to the effectiveness of that actions, is necessary an effective inspection over all of the producers and users, monitoring each volume used. Being a inspection this kind unsustainable to the ma

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Roghair, Craig N. "Recovery From and Effects of a Catastrophic Flood and Debris Flow on the Brook Trout (Salvelinus fontinalis) Population and Instream Habitat of the Staunton River, Shenandoah National Park, VA." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/34286.

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The Staunton River is a high gradient, second order stream approximately 6 km in length located on the eastern slope of the Blue Ridge Mountains in Shenandoah National Park, VA. In June 1995, a catastrophic flood and debris flow altered the instream habitat and <i>Salvelinus fontinalis</i> population of the Staunton River. The debris flow scoured the streambed, deposited new substrate materials, removed trees from the riparian zone, and eliminated fish from a 1.9km section of the stream. By June 1998, both young-of-year (YOY) and age 1+ <i>S. fontinalis</i> had recolonized the debris flow af

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Machin, James Fabian. "'Determined to be weird' : British weird fiction before 'Weird Tales'." Thesis, Birkbeck (University of London), 2016. http://bbktheses.da.ulcc.ac.uk/206/.

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Weird fiction is a mode in the Gothic lineage, cognate with horror, particularly associated with the early twentieth-century pulp writing of H.P. Lovecraft and others for Weird Tales magazine. However, the roots of the weird lie earlier and late-Victorian British and Edwardian writers such as Arthur Machen, Count Stenbock, M.P. Shiel, and John Buchan created varyingly influential iterations of the mode. This thesis is predicated on an argument that Lovecraft’s recent rehabilitation into the western canon, together with his ongoing and arguably ever-increasing impact on popular culture, demands

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Humphrey, Joy Marie. "Weird People." VCU Scholars Compass, 1992. http://scholarscompass.vcu.edu/etd/5075.

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Tolley, Rebecca. "Cora Weiss." Digital Commons @ East Tennessee State University, 2011. https://www.amzn.com/1851099603.

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