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Previous issue date: 2013-01-30 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Apesar do n?mero significativo de barragens constru?das nos ?ltimos anos no Brasil e mesmo em outros pa?ses, s?o poucos os estudos t?cnicos que d?o suporte a este crescimento. Com o objetivo de propor uma nova abordagem metodol?gica para o processo de loca??o e monitoramento de barragens subterr?neas, em condi??es de clima semi?rido, foram realizados estudos em duas sub-bacias hidrogr?ficas (do rio das Cobras e Pau Lavrado) ambas situadas no semi?rido do Estado do Rio Grande. Nesta nova abordagem foram realizados estudos de caracteriza??o f?sica (morfometria e perfil longitudinal) e de caracteriza??o hidroqu?mica (?guas superficiais e subterr?neas). Adicionalmente, foi empregado o Radar de Penetra??o no Solo (GPR) para realizar o imageamento do corpo aluvionar e, posteriormente, gerar o modelo virtual 3D das ?reas imageadas. Uma vez que um dos principais problemas identificados nesta regi?o foi a saliniza??o, a avalia??o mensal da salinidade e da varia??o do n?vel da ?gua foram tamb?m monitorados em tr?s barragens subterr?neas constru?das em 2010. As informa??es sobre a din?mica erosional e deposicional ao longo da bacia permitiram indicar os locais de instala??o e o tipo mais adequado de barragem subterr?nea a ser constru?da (submers?vel ou submersa). O estudo hidroqu?mico indicou que a precipita??o pluviom?trica, a posi??o espacial e a din?mica de renova??o da ?gua nos reservat?rios foram os fatores que mais influenciaram na sua salinidade. Por outro lado, o uso do GPR possibilitou a visualiza??o do contato do corpo aluvionar e de seu embasamento, levando a indica??o dos melhores locais para coloca??o do septo imperme?vel, aliando a menor profundidade de escava??o a maior capacidade de acumula??o h?drica, permitindo, assim, o c?lculo do volume do aluvi?o. Pode-se concluir que o monitoramento das barragens subterr?neas permitiu avaliar a influ?ncia da integra??o das ?guas superficiais e subterr?neas, principalmente relacionado ? presen?a de a?udes ? montante das barragens subterr?neas, na capacidade de recarga e na qualidade das ?guas armazenadas nas barragens subterr?neas. / Despite the significant number of underground dams built in the recent years in Brazil and other countries, few studies provide technical support to this growth. In order to suggest a new methodological approach to the process of location and monitoring of underground dams in semi-arid weather conditions, this study aimed to evaluate two watershed sub-basins, located at the river of Cobras and the river of Pau Lavrado), both situated in the semi-arid state of Rio Grande do Norte. To reach this goal physical (morphologic and longitudinal profiles) and hydro-chemical characterization (superficial or underground water) were performed. Additionally, the imaging process of the alluvial body by using a Ground Penetration Radar (GPR) was assessed to generate a 3D virtual model of the area. Because one of the main problems verified in this region is the water salinization, a monthly assessment of the salinity and the variation of the water level at three underground dams were also performed. The obtained data about the erosional and depositional dynamics presented on the entire basin allowed to determine not only the best place to build an underground dam, but also to determine which kind underground dam should be built (submersible or submerged). The results revealed that the hydro-chemical rainfall, the spatial position and the dynamic exchanges of the underground dams were the main factors that influence their degree of salinization. On the other hand, the GPR imaging enabled the visualization of both the contact and the alluvial foundation from the underground dam leading to the indication of the best place for placement of the waterproof septum. Such technique allows one to combine the lowest depth of excavation to build an underground dam that generates the highest capacity of water accumulation and, therefore, calculates its volume of alluvium. As a conclusion, the monitoring of the underground dams revealed to be of utmost importance to evaluate the influence of the superficial and underground water not only on the recharging of the underground dams, but also on their water quality.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/21612 |
| Date | 30 January 2013 |
| Creators | Lima, Alexandre de Oliveira |
| Contributors | 13893700382, http://lattes.cnpq.br/9888320802954176, Diniz Filho, Jos? Braz, 22219943453, http://lattes.cnpq.br/7412136542629826, Silva, Maria S?nia Lopes da, 34779744415, Ferreira Neto, Miguel, 85048496434, Montenegro, Suzana Maria Gico Lima, 29490790400, http://lattes.cnpq.br/7831378362627809, S?badia, Jos? Ant?nio Beltr?o, Lima Filho, Francisco Pinheiro |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM GEODIN?MICA E GEOF?SICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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