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- Artificial Stream (1)
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- Embankment Dam (1)
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Articles 1 - 6 of 6
Full-Text Articles in Engineering
Inspection Of Earthen Embankment Dams Using Time Lapse Electrical Resistivity Tomography, Jared Stewart Case
Inspection Of Earthen Embankment Dams Using Time Lapse Electrical Resistivity Tomography, Jared Stewart Case
Electronic Theses and Dissertations
According to the National Inventory of Dams (NID), the number of dams across the United States is approximately 85,000. Many of these dams are more than 50 years old and need vast attention to ensure their safety. It is difficult to obtain a full assessment of the dam just by visual inspections alone. This is because many problems associated with dam failure occur internally, which makes it difficult to be observed by the dam inspectors. Examples of these flaws are piping and seepage (flow of water through or around dam walls). It is in this area where geophysical methods can …
Finite Element Modeling Of Seismic Wave Propagation In Earthen Embankments, Binyam Tadese
Finite Element Modeling Of Seismic Wave Propagation In Earthen Embankments, Binyam Tadese
Electronic Theses and Dissertations
The detection of internal seepage zones in embankments (dams and levees) by geophysical seismic techniques such as seismic refraction is limited by a number of factors. Some factors are associated with inversion and smoothing problems during processing, while others are associated with the natural characteristics of embankments and seepage anomalies. In this research, changes in the seismic response associated with: embankment soil compositions and moisture, characteristics of the seepage zone, presence of water in the reservoir, and shape of embankment was studied via 2D and 3D finite element (FE) embankment models. Artificial reflections from external boundaries and numerical dispersion were …
Synthesis And Evaluation Of Naturally Occuring Halogenated Bipyrroles In A Relevant Marine Species, Fundulus Heteroclitus, Kimberly Sheree Foster
Synthesis And Evaluation Of Naturally Occuring Halogenated Bipyrroles In A Relevant Marine Species, Fundulus Heteroclitus, Kimberly Sheree Foster
Electronic Theses and Dissertations
Halogenated dimethyl-2-2'-bipyrroles (HDBPs) have recently been discovered in seabird eggs and have been shown to bioaccumulate in trophic organisms. HDBPs are suspected to be biogenic in nature, derived from evidence of marine natural products that are persistent in the environment and widespread in the Pacific and Atlantic Ocean. The HDBPs exhibit chlorinated and brominated substitution patterns that closely resemble anthropogenic pollutants like the polychlorinated biphenyls (PCBs), polybrominated biphenyls (PBBs), and polybrominated diphenyl ethers (PBDEs). Environmental health concerns exists regarding these naturally occurring HDBPs because several of these analogs were shown to induce the cytochrome P4501A (CYP1A) gene through activation of …
Numerical Evaluation Of Different Retrofitting Techniques Of New Orleans Floodwalls And Implementation Of Advanced Constitutive Model In Flac3d, Sudarshan Adhikari
Numerical Evaluation Of Different Retrofitting Techniques Of New Orleans Floodwalls And Implementation Of Advanced Constitutive Model In Flac3d, Sudarshan Adhikari
Electronic Theses and Dissertations
The objective of this study was to re-examine some but the crucial established failure mechanism, and also to establish other failure mechanisms of the floodwalls due to hurricanes in New Orleans so that the necessary retrofitting techniques could be sought out. Depending on the failure mechanisms, two of the proposed retrofitting techniques such as "structural cap" to maintain integrity by tying adjacent panels of I-type floodwalls, and "bentonite apron" to self seal gaps that occur between the floodwall and foundation soil were chosen, for which their performances had to be evaluated. This dissertation documents all the numerical analysis conducted to …
Geospatial Assessment Of Sustainable Built Infrastructure Assets And Flood Disaster Protection, Alper Durmus
Geospatial Assessment Of Sustainable Built Infrastructure Assets And Flood Disaster Protection, Alper Durmus
Electronic Theses and Dissertations
This research was initiated with a review and synthesis of infrastructure related to city and urban growth, built infrastructure to meet transportation needs and travel demand, and role of mass transit in reducing adverse impacts on the environment and greenhouse gas emissions. Floods are the most frequently occurring natural disaster in the world, which so far claimed millions of lives and resulted in billion-dollar economic costs. Built infrastructure assets in urban and rural areas are not spared from floods' aftermath. A major motivation for this thesis was the 2011 megaflood disaster of Thailand which devastated the green campus of Asian …
Bacterial And Sediment Transport In An Artificial Sand Bed Stream During Unsteady Flow, Mary Alexandra Mccaskill
Bacterial And Sediment Transport In An Artificial Sand Bed Stream During Unsteady Flow, Mary Alexandra Mccaskill
Electronic Theses and Dissertations
Storms cause a substantial increase in the fecal indicator bacteria (FIB) concentrations in stream water. Causes for this concentration increase include FIB-laden stormwater runoff and the release of bacteria from stream-bottom sediments. Studies were carried out to quantify this second cause of water quality impairment. Coliform bacteria are a group of FIB, indicate the presence of pathogenic microorganisms, and have been shown to be transported in streams far from their source areas, especially during storms. FIB transport is dependent on several factors including water velocity, size and transport rates of bed sediments, and the FIB concentration in bed sediment. The …