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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

A atuação sobre a arborização urbana como fator de eficiencia nos serviços dedistribuição de energia eletrica / The performance besides the urban tree planting like factor of efficiency in the services of electric energy distribution

Oliveira Junior, Antomar Viegas de Carvalho e 18 June 1998 (has links)
Orientador: Sinclair Mallet-Guy Guerra / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica / Made available in DSpace on 2018-07-23T20:32:36Z (GMT). No. of bitstreams: 1 OliveiraJunior_AntomarViegasdeCarvalhoe_M.pdf: 10159272 bytes, checksum: 55aaa1b3047a2f48a89d4c3bdf4e7668 (MD5) Previous issue date: 1998 / Resumo: A atuação efetiva sobre a arborização urbana constitui importante elemento para a imagem e eficiência empresarial das companhias de distribuição de energia, não só pelos índices expressos na atualidade, mas principalmente pela sua significativa taxa de crescimento. Por sua vez, as atividades de poda, isoladamente, além de constituírem-se em gastos periódicos e que não guardam qualquer relação com investimentos para melhoria de redes, não possibilitam o completo equacionamento da questão. Além disso, acarretam desgastes com Prefeituras e comunidades e tem sido pautadas pela ausência de técnicas adequadas, potencializando o problema. O presente trabalho pretende determinar a importância dos efeitos provocados pelo contato da arborização sobre a rede elétrica e estabelecer alternativas visando melhorar a performance do sistema elétrico de distribuição e proporcionar uma arborização urbana harmoniosa de forma a reduzir-se sensivelmente à necessidade de podas e, naquelas onde esta atividade seja indispensável, executá-Ias de forma tecnicamente correta, garantindo o equilíbrio, saúde e estética das espécies vegetais / Abstract: The effective performance on the urban tree planting issue is a important element for the energy distribution company's image and efficiency, not only because of the indices presently shown, but also mainly of their significant increase rate. Besides presenting periodic expenses and not having any relation with investments to improve networks, the sole pruning activities do not provide the total solution to the matter. Moreover, such activities cause problems to the City Governments and communities and are mentioned due to the lack of proper techniques making the problem worse. This work intends, therefore, to determine the importance of effects caused by the contact of vegetation with the power system and to stablish alternative to trying provide a harmonious urban tree planting, so as to greatly reduce the needs of pruning, and where such an activity is indispensable to find ways to do it in a technically correct way, assuring the balance, health and aesthetic of the vegetation species / Mestrado / Energia, Sociedade e Meio Ambiente / Mestre em Planejamento de Sistemas Energéticos
2

Modellering av torkstress på vegetation i BlåGrönGråa-system i modelleringsverktyget MIKE SHE / Modeling of drought stress on vegetation in BlueGreenGray-systems in the modeling-tool MIKE SHE

Backlund, Arvid January 2022 (has links)
Huvudsyftet med den här studien var att undersöka vilka parametrar som har störst inverkan på trädens vattentillgång i BlåGrönGråa-system (BGG-system), utvecklat av Edge, och vilka förbättringar som kan göras för att vegetationen bättre ska klara av torka. Ett annat mål med denna studie var attundersöka hur väl det går att efterlikna och simulera BGG-system i modelleringsverktyget MIKESHE, utvecklad av Danish Hydraulic Institute (DHI). För att undersöka vilka parametrar som har störst inverkan på BGG-systems vattenhalt varierades; storleken på tillrinningsområdet, crop factor, växtsubstrat, djup på regnbäddarna, växtval, dräneringsdjup och dräneringshastigheten. Alla simuleringarna genomfördes med meteorologisk data för perioden 1991-2020 för att underöka hur årsvariationer påverkar vattenhalten i systemet. Resultaten visar att stadsträd som inte erhåller något tillskott av vatten via tillförsel av dagvatten kommer utsättas för extremt ogynnsamma förhållanden när det kommer till vattentillgång, och att den parameter som har störst inverkan på vattenhalten i BGG-system är storleken på tillrinningsområdet. För att ytterligare förbättra vattentillgången för träden i BGG-system kan växtsubstratet förbättras genom att öka mängden växttillgängligt vatten. Detta föreslås dock framförallt för större träd eller då tillrinningsområdet inte kan utökas ytterligare. Variationen av djupet på regnbäddarna har relativt liten effekt på resultatet, vilket delvis kan förklaras av andra val i satta parametrar. Växtvalet visar sig i denna studie har liten effekt på vattenhalten, vilket delvis beror på modellens utformning och valdaparametrar. Variationen av dräneringsdjupet och dräneringshastigheten visar sig inte ha någon effekt på de resultat som undersöks i denna studie. Modellen som har satts upp beskriver systemet på ett tillförlitligt sätt, och är ett bra första steg föratt ytterligare öka förståelsen för trädens förutsättningar i dagvattenhantering. Men för att kunna dramer långtgående slutsatser om hur träden klarar av torrperioder behöver ytterligare undersökningargenomföras på BGG-system. / The main purpose of this study was to investigate which parameters have the greatest impact on thetrees’ water supply in BlueGreenGray-systems (BGG-system), developed by Edge, and what improvements can be made to the system to make the vegetation able to withstand periods of droughts better. Another aim of this study was to investigate how well it is possible to imitate and simulate BGG-systems in the modeling tool MIKE SHE, developed by the Danish Hydraulic Institute (DHI). To investigate which parameters have the greatest impact on the water content in BGG-systems the following parameters was varied; the size of the catchment area, crop factor, plant substrate, depth of the rain beds, plant selection, drainage depth and drainage rate. All simulations were performed with meteorological data for the period 1991-2020 to investigate how annual variations affect the watercontent in the system. The results show that city trees that do not receive any addition of water via the supply of stormwater will be exposed to extremely unfavorable conditions when it comes to water supply, and that the parameter that has the greatest impact on the water content in BGG-systems is the size of the catchment area. To further improve the water supply for the trees in a BGG-system, the plant substrate can be improved by increasing the amount of plant available water. However, this is mainly proposed for larger sized trees or when the catchment area cannot be expanded further. The variation in the depth of the rain beds has a relatively small effect on the result, which can be partly explained by other choices in set parameters. The choice of plant in this study has little effect on the water content, which is partly due to the model’s design and selected parameters. The variation of the drainage depth and the drainage rate does not appear to have any effect on the results examined in this study. The model that has been set up describes the system in a reliable way, and is a good first step to furtherincrease the understanding of the trees conditions in stormwater management. However, in order tobe able to draw more far-reaching conclusions about how trees cope with dry periods, further studiesneed to be carried out on BGG-systems.

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