Prever a hidrodinâmica das águas e a dispersão de contaminantes nos corpos dágua, principalmente em regiões costeiras, tem sido um problema a ser enfrentado por engenheiros, devido ao aumento dos impactos ambientais que envolvem as obras e a gestão da engenharia costeira. O uso de modelagem matemática como ferramenta de avaliação tornou-se imperativo para tais estudos. O principal objetivo desta Tese é fazer uma análise crítica da utilização da ferramenta de modelagem matemática na avaliação da dispersão de efluentes leves. A área de estudo engloba a RMBS, com ênfase no Sistema Estuarino de Santos / São Vicente. Para a efetivação desta análise são utilizados três modelos hidrodinâmicos - MIKE 21, POM e Delft3D. Esta abordagem apresentou significativa contribuição para as principais conclusões desta Tese e demonstrou, na prática, as diferenças na utilização dos modelos numéricos hidrodinâmicos. Os resultados dos três modelos utilizados apresentaram-se satisfatórios, sendo que os coeficientes de correlação encontrados, entre os resultados das simulações e dados de medição de campo, para o período de Verão de 2002 foram para o MIKE 21 de 0,63 (considerado 20 dias de processamento); o Delft3D de 0,80 (20 dias) e o POM de 0,70 (30 dias), para a Componente x (Componente E-W do vetor velocidade). Os resultados da modelagem com o POM e o Delft3D, comparados com os dados de medição de campo, imprimiram confiabilidade aos dados de correntes extraídos para o Ponto de Lançamento do Emissário de Santos/São Vicente. Neste ponto a máxima velocidade encontrada, na média da profundidade, foi de 0,27 m/s e, somente na superfície esta velocidade pode chegar a 0,35 m/s. Para a avaliação da dispersão da pluma deste emissário, foi utilizado o sistema especialista CORMIX e seus resultados mostraram que para velocidades de 0,27 e 0,18 m/s as diluições iniciais são superiores a 100 e que nas velocidades 0,08 e 0,12 m/s a diluição inicial é menor que 100. Julga-se que este trabalho contribuiu para a obtenção de um grau maior de conhecimento sobre as questões práticas da modelagem hidrodinâmica. Ou seja, esta contribuição é um passo fundamental para que o assunto seja visto de uma forma mais realista, mostrando e discutindo as características e limitações teóricas e práticas existentes em cada modelo utilizado, sob a ótica da engenharia. / The prediction of the hydrodynamic water circulation and pollutants dispersion, mainly in coastal areas, has been a problem that engineers have been facing. This is due to the increase environmental impacts that involve coastal engineering work and management. The usage of mathematic modeling as assessment tool is necessary for these studies. The main purpose of this Thesis consists in using hydrodynamics models in order to evaluate the hydrodynamical behavior in the region, and to study the effluents dispersion by approaching the marines pollution issue mainly concerning domestic wastewater, and petroleum byproducts leakage. The study area is located in the Central Coast of São Paulo State, named Baixada Santista. The highlighted area analyzed is Santos / São Vicente Estuarine System. Three hydrodynamics models were used - MIKE 21, POM and Delft3D. This approach presented a significant contribution for the main conclusions of this Thesis, and it shows the differences among the hydrodynamics mathematical models. The three models presented good results, the correlation coefficients that were found for the Summer of 2002 were 0.63 for MIKE 21 (considering 20 days of processing); 0.80 for Delft3D (20 days); and 0.70 for POM (30 days), for Component x (Component E-W of velocity vector). In the Point of Santos / São Vicente Outfall Discharge, the maximum depth average velocity reaches 0.27 m/s, and in first layer (surface) the velocity can reach 0.35 m/s. In the assessment of plume dispersion for this outfall, was used the software CORMIX and the results has shown initial dilution higher than 100 for the velocities of 0.27 and 0.18 m/s; and initial dilution lower than 100 for the velocities of 0.08 and 0.12 m/s. This Thesis contributed to obtain a better knowledge about hydrodynamic mathematic modeling. The research reveals a realistic point of view of the characteristics and limitations, in theoretical and practical terms, existing in each model used, from engineering perspective.

Os projetos de irrigação são convencionalmente dimensionados para operar com potência constante, garantindo-se, assim, um desempenho aceitável a campo. Contudo, existem sistemas de bombeamento que não atendem a esse requisito diretamente, como nos casos da energia fotovoltaica e da eólica. Nesses casos, inclui-se algum componente no sistema para regulação da pressão, como reservatórios, emissores regulados e/ou válvulas reguladoras. Apesar de solucionar o problema, pode haver encarecimento do projeto. Em alternativa aos emissores regulados, podem ser utilizados emissores do tipo microtubo. Estes, além de mais baratos, permitem variar seu comprimento a fim de se compensar a diferença de pressão ao longo da linha lateral. Assim, teoricamente, tem-se 100% de uniformidade na vazão dos emissores. Ainda, pode-se variar a pressão na entrada da linha lateral, dentro de certo limite, sem comprometer a uniformidade mínima de aplicação de água dos emissores. Isso permitiria o acoplamento direto do sistema de irrigação com o sistema de bombeamento, em sistemas com potência variável, sem a necessidade de algum mecanismo de interface entre os dois. Portanto, o objetivo deste trabalho foi desenvolver uma metodologia e um aplicativo para o dimensionamento de linhas laterais de sistemas de microirrigação com emissores do tipo microtubo, em que fosse obtido o intervalo de pressão recomendado para operação da mesma. O aplicativo foi desenvolvido em linguagem de programação PHP, para disponibilização aos interessados. O dimensionamento da linha lateral ocorreu em duas etapas: a primeira para se obter os comprimentos dos emissores; e a segunda para se obter os limites de pressão para temperaturas de 10 a 35 °C, respeitando uma variação de vazão de 7%. Após o desenvolvimento do aplicativo, foi instalada uma linha lateral com 250 emissores, com vazão de 1 L h-1 por emissor, e espaçamento de 10 cm. A avaliação do conjunto foi realizada coletando-se a vazão de 51 emissores para três pressões: a máxima (84,43 kPa), a mínima (16,32 kPa) e a ótima (39,00 kPa), sendo esta a que fornecia a menor variação de vazão. As uniformidades de distribuição do menor quartil obtidas para a pressão mínima, ótima e máxima, respectivamente, foram de 95,25, 97,80 e 97,83%; e os coeficientes de uniformidade estatísticos 96,79, 98,37 e 98,37%. Ambos os índices, portanto, podem ser classificados como excelentes. Dessa forma, pode-se concluir que aplicativo desenvolvido foi capaz de fornecer tanto os comprimentos dos microtubos, quanto os intervalos de pressão para operação da linha lateral, para a variação de vazão admitida. / Irrigation projects are conventionally designed to operate at constant power, and thus guarantee an acceptable field performance. However, there are pumping systems that do not directly satisfy such requirement, as photovoltaic, and wind energy. For these cases, some components are add to the system to regulate pressure, such as tanks with constant level, regulated emitters, or regulating valves. Despite of the solution of the problem, the project can be enhanced. As an alternative to regulated emitters, microtubes may be used, which are less expensive and allow varying its length in order to compensate the pressure difference along the lateral line. Hence, theoretically, it provides 100% of emitting uniform flow. Furthermore, the inlet pressure of the line can be varied, within certain limits, without compromising the minimal application uniformity. This would permit direct coupling of the irrigation system to the pumping system, for those with variable power, without needing some mechanisms to interface the two systems. Therefore, the purpose of this study was to develop a methodology and a software for the design laterals with microtube emitters of microirrigation systems, from where the intervals of pressure to operate the system can be obtained. The software was developed in the PHP programming language in order to share it with the users. Laterals were designed in two steps: first to obtain the lengths of the emitters, and second to obtain the pressure limits at temperatures from 10 to 35 ° C, regarding to flow variation of 7%. After developing the software, a lateral line with 250 emitters with flow rate of 1 L h-1, and 10-cm spaced. Evaluations of the arrangement were carried out collecting flow of 51 emitters at three pressures: the maximum (84.43 kPa), minimum (16.32 kPa), and the optimal (39.00 kPa), which provided the lower flow variation. The uniformity of distribution of the lower quartile obtained for the lowest, optimal, and greatest pressure were, respectively, 95.25, 97.80 and 97.83%; and the statistical uniformity coefficients were 96.79, 98.37 and 98.37%. Both indices of uniformity may be then rated as excellent. Therefore, it can be concluded that the software was capable of providing both length of microtubes, and intervals of pressure to operate the lateral line, within the admitted flow variation.

Abstract Examples of numerical modelling of surface water hydrodynamics and water quality are presented. Their meaning for the development of the EIA 3D model system is analyzed from the almost 70 tracer studies (mainly 1971–1974) until the 3-dimensional (3D) solutions which became dominant since 1982. Up to summer 2008, the number of 3D applications has increased to almost 230 while the number of all applications exceeds 300. The specific applications considered are from: Porttipahta reservoir in Northern Finland (I), Porttipahta and Lokka reservoirs (II), combination of reservoirs, lake, river sections, Kemi estuary and the sea (III), Kemi estuary and other coastal applications in the Gulf of Bothnia (IV), Lake Haukivesi in Eastern Finland (V), Lake Näsiselkä in South-West Central Finland (VI), and Kymi River and Kotka estuary in Southern Finland (VII). A detailed description of the 3D model system is given in the application of Näsiselkä (VI). It is completed with drastically changing water levels, drying and wetting of immersed areas, characteristics of pulsing system, and internal loading in the application of Porttipahta (I). The application of the Kymi River and Kotka estuary (VII) shows the sensitivity of tracers as transport indicators and the validity of the transport model. In Lokka and Porttipahta (II) the methods of validity tests are extended to include field tests, laboratory experiments, and comparisons with expert evaluations and analytical solutions. A strong indication of model validity is obtained in Näsiselkä (VI). When the loading after the model work was changed according to a plan included in the computation, the observed changes of water quality corresponded closely with those predicted by the model. Another severe indication of the model validity is from Porttipahta and Lokka (I, II). With the parameter values based on data from 1967–1986, a recent application indicated a close agreement with the observed data from 2000–2006. In Haukivesi (V) and Näsiselkä (VI) the agreement between the model and observed results is extended to the biological indicators of the algal biomass. The integrated application to the network of a planned and two existing reservoirs, a strongly regulated lake, river sections, Kemi estuary and the sea (III) shows the usability of the model system to all types of water bodies. As a practical result it highlights the decay of the effects of a new impoundment with time and distance, including fast dilution in the estuary and the sea.

Malgré leurs mauvaises performances, les modèles de calcul de flux polluants (MCFP) dans les rejets urbains de temps de pluie (RUTP) continuent à susciter de l’intérêt du fait du fort potentiel qu’ils présentent pour prédire et contrôler ces RUTP. La contribution des sédiments à la pollution des RUTP est aujourd’hui largement reconnue comme prépondérante ; en conséquence, une modélisation idoine des processus en réseau apparait comme un élément clé pour améliorer la qualité de ces modèles. Dans ce contexte, plusieurs éléments ont été révélés par des études récentes menées sur les dépôts de réseaux d’assainissement unitaires, notamment sur « Le Marais » : (1) la présence d’une quantité importante de dépôts grossiers quasi-stationnaires qui modifient les caractéristiques du réseau ainsi que les conditions d'écoulement ; (2) l'identification d’un dépôt organique cohésif sur le Marais, la couche organique, capable d’expliquer la contribution du réseau à la pollution de RUTP et qui se constitue dans les parties amonts des collecteurs principaux. L’objectif de cette thèse est d’examiner l’effet de l’intégration de ces observations dans un MCFP de type semi-distribué, en prenant comme cas d’étude le site expérimental du Marais.Dans la première partie, on a travaillé à la prise en compte des dépôts grossiers dans le modèle hydrodynamique, puis on a évalué l’impact de cet ajout sur les processus de transport solide dans les réseaux. Pour y parvenir, un outil de modélisation capable de gérer l’écoulement sur une bathymétrie complexe était nécessaire. Ainsi, un schéma numérique conservatif de type Godounov a été développé et validé par rapport à certains cas de référence, avant de l’appliquer à l'échelle du réseau du Marais. Les résultats ont démontré un effet significatif de ces dépôts grossiers sur l’hydraulique du réseau, qui ensuite influence la production des particules et, dans une moindre mesure, le processus de transfert.Dans la deuxième partie, des données acquises récemment sur plusieurs sites avec des contributions de dépôts aux RUTP comparables et d’états d’encrassement différents (notamment pour la couche organique) ont été analysées dans le but d’identifier le vrai rôle de cette couche organique vis-à-vis de la production en réseau par temps de pluie. Les résultats ont montré que la couche organique ne représente qu’une source mineure vis-à-vis de la production en réseau. Afin d’identifier la source majeure, le modèle hydraulique développé dans la première partie a été couplé avec le modèle d’érosion de Skipworth et le modèle d’advection simple pour tester différents scenarii de localisation de dépôts. Les résultats de ce banc d’essai sont cohérents avec ce qui précède concernant la contribution de la couche organique ; il en ressort par ailleurs que les localisations les plus vraisemblables de la source prépondérante sont, dans l’ordre, le réseau amont et les collecteurs principaux / Despite their disappointing performance, urban stormwater quality models are still considered to be a potentially efficient decision making tool to control combined sewer overflows (CSOs) and thus are receiving ongoing investments to improve their quality. In this respect, in-sewer sediments are now widely recognized for their preponderant contribution to the pollution of CSOs assigning therefore a particular importance to mastering sewer processes module when refining these models. Recent studies conducted on in-sewer sediments in one of the extensively investigated urban catchments in Paris, Le Marais, highlighted new elements that could be helpful when addressing this module: (1) the existence of quasi-steady sewer grits deforming sewer characteristics and thus suspected to modify sewer flow conditions; (2) the identification of the potentially eroded sediment type during wet weather that is formed at the upstream parts of the Marais main trunks, the organic layer, that showed a cohesive like characteristic during in-situ flushing experiments. A site specific model for the Marais catchment is developed in this thesis adopting a semi-distributed configuration to examine the effect of integrating these field observations in its structure on the simulation of outfall discharges’ quality.In the first part, an evaluation of the impact of considering the sewer grits in the hydrodynamic module on the solid production and transfer processes in sewer system was carried out. To do so, a special modelling tool was necessary in order to handle sewer flow over a complex bathymetry. So, a well-balanced Godunov numerical scheme was developed and verified against some reference test cases before being extended to the Marais sewer scale. Results showed a significant impact of these coarse deposits on the hydraulic parameters. Solid production was demonstrated to be more sensible to this impact than the transfer processes.In the second place, previous findings obtained on combined sewer systems having no organic layer and high sewer contribution along with those obtained on the Marais were deeply investigated to identify the real role of this organic layer in sewer wet weather production. Results showed that this latter is only a minor source for wet weather erosion. To identify the major source, a quality module based on Skipworth erosion formulation and simple advection equation was used to test several scenarios of sewer sediment localization. The benchmark confirmed that the organic layer is not the major source of sewer production and that another source is preponderant and that can be located at the upstream branches as well as along the principal collectors with more probability of the former case

Examensarbetet presenterar produktutveckling av gripdon åt uppdragsgivaren Meritor HVS AB. För att få en bra förståelse av hur ett gripdon fungerar så har författarna beskrivit hur robotar hanterar gripdon. Uppdragstagaren har fått som uppdrag att utveckla ett gripdon då det befintliga gripdonet har vissa brister. Man ställs dagligen inför nya förbättringar, tekniken utvecklas fort och man strävar därför både som företagare och konstruktör mot ständiga förbättringar. En grov nulägesanalys genomfördes i inledningsfasen av arbetet för att få en helhetsförståelse av processen som gripdonen utför för att utifrån det sedan kunna jobba vidare för att utveckla ett gripdon som klarar av alla varianter av råämne som företaget arbetar med.  Då en intern benchmarking gjordes i företaget lades stor vikt på att utveckla ett nytt gripdon som kunde hantera alla varianter av kronhjulsämne som företaget ska hantera. Fördelarna blir då att man minskar ställtider på stationen samt att om nya råämne tillkommer så kommer gripdonet att kunna hantera även detta med utan att problem uppstår.  För att få fram hållbara koncept så genererade författarna först idéer med hjälp av en tankekarta för att få en bred vetskap om problemet och kunna inrikta sig på att få fram det bästa möjliga konceptet att arbeta med. För att bevisa att de framtagna koncepten kan hantera alla varianter av råämne så har författarna genomfört beräkningar som visar teoretiskt att konceptförslagen är hållbara. koncepterna som presenterats i projektet har gjorts av CAD- programmet Creo Parametric.  Resultatet av examensarbetet visar att konceptet med två parallella hydraulikcylindrar uppfyller kraven som författarna har ställts inför, och det har även visat en utvecklad produktframtagning som går att implementera i företaget. / The thesis presents the product of grippers for the client Meritor HVS AB. To get a good understanding of how a gripper works, the authors described how robots handling grippers. The contractor has been given the mandate to develop a gripper when the existing gripper has some shortcomings. It is daily facing new improvements, technology develops fast and the aim is therefore both business and designer for continuous improvement. A situation analysis conducted in the initial phase of our work was made to get an overall understanding of the process to be able to continue working to develop a gripper that can handle all varieties of raw material as the company works with. When an internal benchmarking was done in the company placed a strong emphasis on developing a new gripper that could handle all variants of the crown wheel substance that the company must manage. The benefits will then reducing setup time at the station and that of new raw material will then gripper to handle too with without problems. In order to produce a sustainable concept that generated the authors first ideas using a mind map to get a broad knowledge of the problem and to focus on getting the best possible concept to work with. To prove that the developed concepts can handle all varieties of raw material, the authors performed calculations showing that the theoretical concept proposals is sustainable. The concepts presented in the project has been done by the CAD program Creo Parametric. The results of the thesis show that the concept of two parallel hydraulic cylinders meets the requirements we had, and it has also shown a developed product realization that can be implemented in the company.

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 have been developed. In this report, a new designing procedure has been established, and equations for each main fishway type have been suggested. In addition, flow conditions below different fishway types have been examined, and velocity distributions at weirs with V-shaped crests in both pool-and-weir fishways and at a single weir have been compared in different discharges and drops. Fishway flows have been compared with flows over single weirs.

Material handling and logistics are fundamental parts of today’s global societyand forklifts are a crucial part of the material handling process. Making these asefficient and reliable as possible are therefore of great interest. In this master thesis, an effort has been made to improve the control of the hydraulic lowering function of a specific forklift. Today the lowering function iscontrolled through an open-loop control scheme making the control performancesensitive to disturbances and system changes. One disturbance of special interestis the temperature of the hydraulic fluid. The goal of this thesis was therefore todesign a controller with improved robustness as well as improved performance. To solve this a model-based control design approach was used and a nonlineargrey-box model was derived, implemented and validated. The model parameterswere estimated using a nonlinear least-squares optimisation problem. The resulting model captures most of the system dynamics and the model fit is higher than 70% which was deemed good enough to use for control design. A PID controller was designed based on the estimated model and the controllerparameters were optimised. Furthermore, the controller was evaluated in simulations and implemented in a real forklift. The proposed controller was compared to the original controller for various scenarios. The results reveal improvedsteady state behaviour with enhanced temperature robustness compared to theoriginal controller. / Materialhantering och logistik är viktigt för att dagens globala samhälle ska fungera. En grundläggande del i materialhanteringsprocessen är gaffeltruckar, därför är det av intresse att göra gaffeltruckar så effektiva och pålitliga som möjligt. I det här examensarbetet har ett försök gjorts till att förbättra styrningen av den hydrauliska sänkningsfunktionen hos en specifik gaffeltruck. Dagens lösning använder sig av öppen styrning vilket gör reglerprestandan känslig för störningar och systemförändringar. En störning av extra intresse är temperaturen av hydraulvätskan. Målet med detta arbete var därför att designa en regulator med ökad robusthet och prestanda. För att lösa detta har en modellbaserad metod för regulatordesign använts där en olinjär gray-box modell härleddes, implementerades och validerades. Modellparametrarna skattades genom att ställa upp och lösa ett ickelinjärt minsta-kvadrat optimeringsproblem. Den resulterande modellen fångar det mesta av systemdynamiken och modellpassningen till uppmätt data var högre än 70\% vilket ansågs bra nog för att kunna använda modellen som en bas för regulatordesign. En PID regulator designades och regulatorparametrarna optimerades med hjälp av modellen. Regulatorn utvärderades i simuleringar och för att sedan implementeras den på en riktig gaffeltruck. Den föreslagna regulatorn jämfördes med den ursprungliga regulatorn i flera olika testfall. Resultaten visade ett bättre steady-state beteende och ökad robusthet mot temperaturförändringar för den designade regulatorn jämfört med den ursprungliga regulatorn.

M.Ing. / Stochastic analysis of water distribution systems allow the performance of systems to be evaluated under more realistic conditions that involve both deterministic and probabilistic factors. A software package called Mocasim II has been developed to perform stochastic analysis on water supply systems. This allows the relationship between the reliability of the supply system and the capacity of its service reservoir(s) to be quantified using Monte Carlo analysis. In a Monte Carlo analysis the factors which influence the reliability of the system such as water demand, fires, and pipe failures are simulated stochastically over a long period of time. A reliability-capacity relationship is quantified by analysing the failure behaviour of different service reservoir sizes. A previous version of Mocasim used a simple mass balance model for calculating the flows in simple, linear distribution networks. Mocasim II extends the functionality of its predecessor by enabling the probabilistic modelling of more complex water distribution models. This was achieved by integrating the stochastic modelling technique into the Epanet hydraulic analysis software package. Mocasim II was designed using an object-oriented model which has various advantages such as ease of programme testing, upgrading and maintaining as well as minimum repetitive code and a logical structure. Additional capabilities of Mocasim II include the determination of probability distributions for network properties such as flow rate, pressure and water quality at any node in the network. This will assist in estimating the levels of service of a water supply system. This project focussed on developing sections of Mocasim II to be integrated with existing software such as Mocasim I, the Epanet hydraulic engine, OOTEN, and a random number generator. The software was tested thoroughly. This involved testing each class separately as well as applying it to a test case which is a simple network consisting of a source, reservoir and demand node. The theoretical background of the stochastic model has been investigated and various aspects discussed. Various case studies in Windhoek-Namibia, Mabeskraal-South Africa and an Epanet design example demonstrate the capabilities of the software and benefits of a stochastic analysis. A workbook to be used in addition to the software's help facility has been developed.

An investigation into the thermo-mechanical closure effect when a fluid leaks through a crack is presented here. The extended finite element method is the modelling scheme adopted for this, and the application of heat flux and pressure jump conditions along the crack is one of the novel contributions of this work. By modelling the fluid as one dimensional steady state and obtaining a heat transfer coefficient, it has been shown here that coupling the fluid with the structure is possible all within a single element. Convergence studies done with analytical models as a benchmark demonstrate the accuracy of the new method. Simulations are performed with the new element for conditions seen in both gas cooled and water cooled reactors. Significant crack closure is observed when the bulk fluid temperature is 20oC hotter than the structure. It was also found that the amount of closure due to crack wall heating varies depending on the external boundary conditions, this is quantified in the thesis.

Os conceitos de competência do escoamento e de capacidade de transporte foram desenvolvidos para escoamentos fluviais e acabam sendo transferidos para a modelagem de correntes de turbidez. No entanto, não é claro até que ponto o estabelecimento de analogias entre o ambiente fluvial e as correntes de turbidez pode ser realizado. Nesse contexto, o principal objetivo deste trabalho foi avaliar os conceitos de competência e de capacidade nas correntes de turbidez. O estudo foi desenvolvido experimentalmente, em um canal de inclinação variável de 4 m de comprimento, 40 cm de altura e 12 cm de largura. Um leito móvel foi construído em um trecho intermediário do canal utilizando sedimento - carvão mineral (ρ = 1405 kgm³) - com tamanho areia média. No total, 30 simulações de correntes de turbidez contínuas foram realizadas, utilizando o mesmo sedimento, porém com tamanho areia muito fina. Foram simuladas três declividades diferentes (6%, 0,3% e 0,015%), vazões de injeção entre 15 e 25 lmin, concentrações iniciais variando entre 0,03% e 5,5% e a duração dos ensaios ficou compreendida entre 3 e 30 min. O levantamento do perfil longitudinal do leito móvel, antes e após o ensaio, foi realizado e todo o sedimento foi coletado. Três quantidades distintas de sedimento foram quantificadas: a quantidade depositada antes do leito móvel, a quantidade depositada no leito móvel e a quantidade depositada depois do leito móvel. O cálculo da eficiência de transporte das correntes de turbidez no trecho do leito móvel, bem como das suas descargas sólidas, foi realizado. Também foram realizadas análises granulométricas do sedimento depositado antes e após do leito móvel. Por fim, parâmetros do fluxo foram obtidos (altura e velocidade) através de análises visuais e números adimensionais clássicos do transporte sólido em canais abertos foram avaliados. A partir da interpretação dos dados, conclui-se que os conceitos de competência do escoamento e de capacidade de transporte não foram capazes de refletir o diâmetro característico do sedimento transportado pelas correntes simuladas e a capacidade máxima de transporte desses fluxos, como normalmente ocorre em escoamentos fluviais. A relação entre a eficiência de transporte desses fluxos e a descarga sólida dos mesmos indicou que a partir de uma região a eficiência tornou-se invariante. Essa relação possui curvas com tendência logarítmica e as suas assíntotas ocorreram em valores de eficiência da ordem de 50% (inclinação de 6%) e de 40% (inclinações de 0,3% e 0,015%). A relação entre o diâmetro característico do sedimento depositado depois do leito e antes do leito indicou uma diminuição de cerca de 18% no tamanho dos grãos depositados a jusante. / The modeling of turbidity currents uses the concepts of competence and flow capacity that have been developed based on river hydraulics. However, the analogies between the fluvial environment and turbidity currents are not very clear. The main purpose of this study was to evaluate the competence and flow capacity of turbidity currents. The study was performed using an experimental channel 4 m long, 40 cm high, and 12 cm wide with variable slope. A mobile bed of medium sand-size - mineral coal (ρ=1405 kgm³) - was constructed in an intermediate area of the channel. In total, 30 simulations of continuous turbidity currents were performed and the sediment used in the turbidity currents was very fine sand-size mineral coal. The simulations were accomplished considering three different channel slopes (6%, 0.3% e 0.015%); injection discharge varied between 15 and 25 l/min, and initial volumetric concentrations varied between 0.03% and 5.5%. The simulations lasted between 3 and 30 minutes. The longitudinal profile of the mobile bed was analyzed before and after each simulation, and all the sediment was collected at the end. Three different amounts of sediment were quantified: the amount of sediment deposited before, on, and after the mobile bed. Based on this data, both the transport efficiency and solid discharge of the turbidity current on the mobile bed were determined. Particle-size distribution of the deposited sediment before and after the mobile bed was also carried out. Finally, flow parameters were obtained (high and velocity) considering visual evaluation and the classical dimensional numbers in sediment transport in open channel flows were analyzed. The data interpretation revealed that the competence and flow capacity parameters were not able to reflect the grain diameter transported by the simulated currents and a maximum flow capacity of these flows, as usually is observed in fluvial flows. The relation between the transport efficiency and solid discharge of these flows demonstrated that after a certain point, the efficiency became constant. This relation resulted in log trend curves with asymptotes located at efficiency values of approximately 50% (6% slope) and 40% (0.3% and 0.015% slopes). The characteristic diameter of the sediment deposited after the mobile bed presented a reduction of 18% when compared to the sediment deposited before the mobile bed.