Aquesta tesi permet adquirir una millor comprensió de la dinàmica dels plomalls hidrotèrmics en l'estany de Banyoles i correlacionar la meteorologia amb els processos de fluïdització que s'hi produeixen. S'han trobat els patrons atmosfèrics que generen els esdeveniments de les fluïditzacions així com la seva freqüència. Això és crucial per a determinar la qualitat de l'aigua de l'estany. S'han trobat inhomogeneïtats espacials tant en el plomall crònic que es desenvolupa en la cubeta B1, com en el plomall episòdic de la cubeta B2. S'ha caracteritzat l'estructura del plomall generat a la cubeta B2 i s'ha comparat amb el desenvolupat a la cubeta B1. Finalment, s'han realitzat simulacions numèriques mitjançant un model numèric: MIT General Circulation Model, en el qual s'ha hagut de fer canvis en les condicions de contorn per a situar la font convectiva al fons de la columna d'aigua. Les simulacions s'han comparat amb els resultats experimentals trobats mitjançant campanyes. / The aim of this thesis is to acquire a better understanding of the dynamics of the hydrothermal plumes in the lake and to gain more insight into the interrelationship between meteorology and fluidization. They have been found the atmospheric patterns that generate the fluidization events, as well as their frequency. This is crucial to determining the water quality of Lake Banyoles. They have been found spatial inhomogeneities of the chronic thermal plume found in B1 and of the episodic thermal plume in B2. The structure of thermal plume in B2 has been characterized and compared to the plume developed in B1. Finally, it has been used a numerical model: MIT General Circulation Model. It has been necessary to modify the boundary conditions moving the buoyancy source from the top of the water surface to the bottom. Results have been compared to experimental data undertaken from the field campaigns.

FundaÃÃo de Amparo à Pesquisa do Estado do Cearà / A fim de compreender e predizer evoluÃÃes geomorfologicas em mares e em estuÃrios litorais necessita-se de um modelo que descreva a dinÃmica do movimento da Ãgua, o movimento do sedimento e a evoluÃÃo de limites erodiveis (como o fundo). Os Ãltimos dois mÃdulos requerem a informaÃÃo quantitativa sobre a erosÃo, a deposiÃÃo e o transporte do sedimento. As estruturas sÃo construÃdas ao longo da costa para vÃrias finalidades e causam modificaÃÃes no ambiente natural com mudanÃa circunstanciais da linha de costa. A concepÃÃo do porto de PecÃm requereu do governo estudar e impedir as possÃveis alteraÃÃes da linha da costa prÃximo Ãs estruturas construÃdas. EntÃo, atravÃs de simulaÃÃo numÃrica, utilizando-se moderno software, MIKE21 e LITPACK, estudou-se e previu-se o comportamento da linha de costa nos dez anos seguintes ao inÃcio da construÃÃo, 1996. Este trabalho pretende verificar a realidade daquela previsÃo. Os resultados para a dinÃmica da linha de costa da regiÃo do porto de PecÃm foram obtidos atravÃs de comparaÃÃes da sua evoluÃÃo desde o momento inicial da construÃÃo do terminal portuÃrio, mostrando, assim, as transformaÃÃes causadas pelo transporte do sedimento em dois perÃodos de estudo, antes e depois da construÃÃo do embarcadouro provisÃrio, e comparar com os resultados determinados pelas simulaÃÃes numÃricas dos softwares, MIKE21 e LITPACK / In order to understand and predict geomorphologic evolutions in coastal seas and estuaries a model is needed which describes the dynamics of the water motion, sediment movement and the evolution of erodible boundaries (like the bottom). The latter two modules require quantitative information about erosion, deposition and transport of sediment. The structures are constructed to the long one of the coast for some purposes and cause modifications in the natural environment with change of the circumstantial shoreline. The conception of the port of PecÃm required of the government to study and to hinder the possible alterations of the coast line next to the constructed structures. Then, through numerical simulation, using modern software, MIKE21 and LITPACK, it was studied and one foreseen the behavior of the shoreline in the ten following years to the beginning of the construction, 1996. This work intends to verify the reality of that forecast. The results for the dynamics of the shoreline of the region of the port of PecÃm had been gotten through comparisons of its evolution since the initial moment of the construction that terminal port, showing, thus, the transformations caused by the transport of the sediment in two periods of study, before and after the construction of the provisory docking, and to compare with the results determined for the numerical simulations of software, MIKE21 and of LITPACK

Diploma thesis is focused on understanding problematic of sedimentation in reservoirs with relation on flood episodes. For creating numerical model was necessary to ensure data about morphology of the river, granular composition of the riverbed and hydrology data. In thesis is written how were obtained these documentations, description of creating numerical model in program HEC – RAS 5.0.7. and results of done simulations of real flood episodes, which took place in years 2004, 2005, 2006, 2009, 2013. Output is evaluation each flood episode, description of grain class curves and evaluation of yearly flow before change of riverbed due to transport of sediments and after change of morphology of riverbed.

The subject of this diploma thesis is engineering design of the sediment conveyer. Conveyer is instrumental to total emptying of sediment silo that is situated in a sewage treatment plant. Proposed construction has to fulfill the specified functional requirements and parameters. Parts of solution are also necessary analytical and FEM calculations.