Thesis (M.S.)--West Virginia University, 2000. / Title from document title page. Document formatted into pages; contains xi, 65 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 63-65).

Thesis (Ph.D.)--Hong Kong University of Science and Technology, 2009. / Includes bibliographical references (p. 278-291).

Thesis (Ph. D.)--University of Wisconsin, 1966. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (Ph. D.)--West Virginia University, 2006. / Title from document title page. Document formatted into pages; contains xx, 320 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 156).

Thesis (M.Sc.)--York University, 2005. Graduate Programme in Geography. / Typescript. Includes bibliographical references (leaves 133-138). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://gateway.proquest.com/openurl?url%5Fver=Z39.88-2004&res%5Fdat=xri:pqdiss &rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:MR11778

Orientador: George de Paula Bernardes / Banca: Paulo Valladares Soares / Banca: Heraldo Luiz Giacheti / Resumo: Este trabalho de pesquisa tem por objetivo geral avaliar o processo de infiltração da água em um solo típico da região do Vale do Paraíba, sob diferentes declividades da superfície, utilizando para isso um lisímetro de vídeo e um simulador de chuva, calibrado no próprio laboratório. O estudo se justifica pelo fato de o processo de infiltração ser um dos principais responsáveis pela manutenção do escoamento dos cursos d'água e também pela compreensão do comportamento desse tipo de solo ao longo de um evento de precipitação, frente a redução dos fatores de segurança. O solo residual de biotita gnaisse, caracterizado como um sílte de baixa plasticidade, foi seco, destorrado e então depositado no interior do lisímetro em camadas de 3cm, sendo então compactado com um soquete a altura de queda padronizada. No decorrer de ensaio, as parcelas de água foram avaliadas por meio de relações temporais e volumétricas, e o avanço da frente de umedecimento por meio de câmera filmadora. No laboratório, foram realizados ainda ensaios para a caracterização completa do material em diferentes instantes de reaproveitamento da amostra, além ainda de ensaios de permeabilidade e de sucção para determinação das curvas características, de distribuição de poros e de condutividade hidráulica. A modelagem numérica pelo método teórico de Green & Ampt (1911) apresentou respostas satisfatórias, com uma considerável aderência do modelo em relação aos dados obtidos experimentalmente, principalmente para a declividade de 5%. O modelo permitiu ainda a separação entre a frente de umedecimento e a zona de transmissão, regiões ao longo do perfil, completamente diferentes quanto ao grau de saturação e gradiente de potencial da água, onde foi possível observar a forma bastante clara a influência da declividade... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: This research paper has the objective at evaluating the process of infiltration of water in a typical soil from de region of the Paraíba Vallery, on different slopes inclination, making use of a lysimeter and a rainfall simulator, calibrated in the laboratory. The model developed in the laboratory, consists of a lysimeter glass box and a simulated rainfall with spreaders, calibrated in the laborator. The study is justified by the fact that the process of infiltration is a majo contributor to the maintenance of the flow of water courses and also for understanding the behavior of this type of soil along a rainfall event, ahead of the reduction factors of safety. The residual soil biotite gneiss, characterized as silt low plasticity, was air dried and trimmed before insertion inside the lysimeter by layers of 3 cm, and then compacted with a socket drop height standardized. During the test, the parcels of water evaluated by volumeric and temporal relations, and advancement of the witting front through the movie camera. In laboratory tests were performed yet for full characterization of the material at different instants of reusing the sample, and further testing for permeability and suction for determination of the characteristic curves of pore size distribution and hydraulic conductivity. Numerical modeling by theoretical method of Green & Ampt (1911) showed satisfatory answers, with a considerable adherence of the model against data obtained experimentally, especially for the slope of 5%. The model also allowed the separation of the wetting front and the transmission zone, regions along the profile, completely different in the degree of saturation and water potential gradient, where we could see quite clearly the influence of slope on each one of these areas. The increased slope generated a slow advance of transmission zone in relation to the wetting... (Complete abstract click electronic access below) / Mestre

Made available in DSpace on 2014-06-11T19:26:15Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-02-25Bitstream added on 2014-06-13T18:54:25Z : No. of bitstreams: 1 paesjunior_ns_me_bauru.pdf: 4613570 bytes, checksum: f7b2581cd54d242e3a23837852c5e7a8 (MD5) / Este trabalho de pesquisa tem por objetivo geral avaliar o processo de infiltração da água em um solo típico da região do Vale do Paraíba, sob diferentes declividades da superfície, utilizando para isso um lisímetro de vídeo e um simulador de chuva, calibrado no próprio laboratório. O estudo se justifica pelo fato de o processo de infiltração ser um dos principais responsáveis pela manutenção do escoamento dos cursos d'água e também pela compreensão do comportamento desse tipo de solo ao longo de um evento de precipitação, frente a redução dos fatores de segurança. O solo residual de biotita gnaisse, caracterizado como um sílte de baixa plasticidade, foi seco, destorrado e então depositado no interior do lisímetro em camadas de 3cm, sendo então compactado com um soquete a altura de queda padronizada. No decorrer de ensaio, as parcelas de água foram avaliadas por meio de relações temporais e volumétricas, e o avanço da frente de umedecimento por meio de câmera filmadora. No laboratório, foram realizados ainda ensaios para a caracterização completa do material em diferentes instantes de reaproveitamento da amostra, além ainda de ensaios de permeabilidade e de sucção para determinação das curvas características, de distribuição de poros e de condutividade hidráulica. A modelagem numérica pelo método teórico de Green & Ampt (1911) apresentou respostas satisfatórias, com uma considerável aderência do modelo em relação aos dados obtidos experimentalmente, principalmente para a declividade de 5%. O modelo permitiu ainda a separação entre a frente de umedecimento e a zona de transmissão, regiões ao longo do perfil, completamente diferentes quanto ao grau de saturação e gradiente de potencial da água, onde foi possível observar a forma bastante clara a influência da declividade... / This research paper has the objective at evaluating the process of infiltration of water in a typical soil from de region of the Paraíba Vallery, on different slopes inclination, making use of a lysimeter and a rainfall simulator, calibrated in the laboratory. The model developed in the laboratory, consists of a lysimeter glass box and a simulated rainfall with spreaders, calibrated in the laborator. The study is justified by the fact that the process of infiltration is a majo contributor to the maintenance of the flow of water courses and also for understanding the behavior of this type of soil along a rainfall event, ahead of the reduction factors of safety. The residual soil biotite gneiss, characterized as silt low plasticity, was air dried and trimmed before insertion inside the lysimeter by layers of 3 cm, and then compacted with a socket drop height standardized. During the test, the parcels of water evaluated by volumeric and temporal relations, and advancement of the witting front through the movie camera. In laboratory tests were performed yet for full characterization of the material at different instants of reusing the sample, and further testing for permeability and suction for determination of the characteristic curves of pore size distribution and hydraulic conductivity. Numerical modeling by theoretical method of Green & Ampt (1911) showed satisfatory answers, with a considerable adherence of the model against data obtained experimentally, especially for the slope of 5%. The model also allowed the separation of the wetting front and the transmission zone, regions along the profile, completely different in the degree of saturation and water potential gradient, where we could see quite clearly the influence of slope on each one of these areas. The increased slope generated a slow advance of transmission zone in relation to the wetting... (Complete abstract click electronic access below)

Seepage barriers have been used extensively to mitigate seepage problems in dams and levees. Although the design of many of these dams and levees has been based on intact barriers, seepage barriers have been shown to be susceptible to deformation and cracking when high differential hydraulic pressures act across the barrier. Under certain conditions, these cracks can lead to serious seepage problems, which could potentially lead to the development of a low-resistance seepage pathway. Three scenarios have been identified where there is the potential for erosion to occur adjacent to a crack in a barrier: 1) erosion at the interface between a fine-grained soil and a course-grained soil, 2) erosion of overlying soil due to flow along a joint in bedrock, and 3) erosion of the barrier material. The objective of this study is to investigate the first mode of erosion and identify the conditions at which more serious seepage problems can develop. The research has been performed using a laboratory model to simulate conditions near a seepage barrier crack under the scenarios described above. The results from the laboratory testing were compared to finite element seepage models for each scenario to estimate the flow velocities near the crack. The flow velocities were compared to estimated critical velocities of the soil to asses where erosion is likely to occur. A comparison was made between the observed behavior in the model and the behavior predicted with the computer model. The results of the research will be used to develop a method to assess the potential for erosion to occur and develop into a failure mode based on conditions near seepage barrier cracks.

Sand boil formation due to underseepage is a potential failure mechanism for levees in the Lower Mississippi River Valley. Sand boils were identified in the Buck Chute study area in the 1990s during high water events and during the 2009 Flood. The site is unique due to the presence of point bar and abandoned channel deposits. To understand the role of these alluvial deposits on sand boil formation at the site, a geologic investigation of the subsurface was conducted. Using shallow geophysics, cone penetrometer tests (CPT), borings, and a geographic information system (GIS), it was concluded that the thin blanket associated with point bar deposits, abandoned channel deposits causing a blocked seepage path, and head differential changes caused by the Muddy Bayou Control Structure were the controls of sand boil formation at Buck Chute.

No description available.