Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 53 for “"Dredge"”.
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Dredge
<p>The essays compiled in this thesis seek to explore the complexity of faith and family, while attempting to reconcile the two. They take a raw look at mental illness and the aftermath, while investigating what it means to recover, and the messiness and ugliness that often accompanies recovery. …
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Dredge spoil dispersion from an inner shelf dump-mound
A study was undertaken on the dispersion of dredge spoil from a dump-mound on the inner shelf in 11-17 m water depth, 3 km offshore from Tauranga Harbour, New Zealand. Graphic and volumetric analysis of bathymetric changes over the dump-mound and its near vicinity, between 1978 and 1988, showed …
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Progressive speed trials of the sea-going dredge Comstock
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Naval Architecture and Marine Engineering, 1916.
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Calcite Cementation of Sixty-Five-Year-Old Aragonite Sand Dredge Pile
… (23°31'45"N, 75°49'41"W) in 1942 produced four dredge piles of cross-bedded aragonite skeletal sand. The spoils piles are on the leeward (western) shore of the island, where they are subject to minimal wave energy. Collectively they are 350 x 50 m in plan view and 2 m high. The surface is very …
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An Analysis of Dredge Efficiency for Surfclam and Ocean Quahog Commercial Dredges
… populations using commercial hydraulic dredges. The Patch Model was formulated to estimate gear efficiency and organism density from the data. The range of efficiencies estimated is substantial, leading to uncertainty in the application of these estimates in stock assessment. Analysis of …
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Suction Dredge Mining Impacts on Pacific Lamprey Populations and Habitat in Washington State: A Case Study of the Entiat River
<p>Suction dredge mining is a largely unregulated recreational activity in Washington State with potentially significant impacts to aquatic habitat. Although dredging has the potential to cause widespread ecological effects, only impacts to select species have been thoroughly assessed. Due to their …
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The effects of oxygen deficiency, hydrogen sulphide and turbidity on the rock lobster, Jasus lalandii : implications for diamond dredge-mining in Namibia
… as part of a pre-feasibility study for a new dredger (a Trailing Suction Hopper Dredger) to be employed for offshore diamond mining along the Namibian south coast. The aims of this study were to assess (a) the potential mining-induced impacts on oxygen and turbidity, and (b) the behavioural …
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Two-dimensional cut plan optimization for cutter suction dredgers
Optimal cut plans for cutter suction dredgers aim to maximize operational efficiency. Maximizing operational efficiency involves minimization of stoppage time resulting from non-productive dredger movements. To automate a systematic search for optimal twodimensional cut plans for cutter suction …
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Finite element modeling of contaminant transport through confined disposal facilities
… channels which produces about 300 million yd³ of dredged sediments annually. Many of these sediments have to be contained within confined disposal facilities (CDFs) due to the presence of heavy metals, PCB’s and other harmful constituents within the pore water of the dredge soils. However, these …
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The potential alternative uses of dredged material in the Humber Estuary
… (as well as other port operators) routinely dredges parts of the estuary for the safe navigation of vessels. Occasionally developer’s capitals dredge new areas to create new or deeper channels or berth pockets in order to remain economically competitive.This study has investigated the …
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Zooplankton, Macroinvertebrate, Herpetile, and Ichthyofaunal Biodiversity of Riverine Habitat on the Upper Missouri River
… sampling included a petite ponar dredge for the benthos as well as dipnet smapling. Additionally, the molluskan fauna was sampled through visual observations with the use of a shell bar, and with the petit ponar dredge. Herpetiles were collected through visual observatiosn and with …
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Mixing and Nucleosynthesis in Low- and Intermediate-Mass AGB Stars
… {\rm bol}$ = $-4$ can be understood in terms of dredge up in thermally pulsing asymptotic giant branch (AGB) stars. Models in this study include the effect that carbon recombination has upon opacity, and it is shown that a low-metallicity (Z = 0.001), low-envelope mass (0.1 M$\sb\odot$), low-core …
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Choreographing Sediment
… material. This thesis explores the prospect of dredge material being more than engineered fill. It suggests that dredge processing can become the basis for a new form of productive recreational landscape, one that can engage the public in a conversation of the spatial and material operations …
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The geochemistry of selected mid-ocean ridge basalts from the Southern mid-Atlantic ridge (40°- 55°S)
In 1993, dredge-sampling from 40.6°S to 525.5°S, during cruise 9309 of the R/V Maurice Ewing, greatly increased the number of basalts recovered from this section of the southern Mid-Atlantic Ridge (SMAR), and significantly expanded the global suite of samples from slow-spreading ridges.
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Adapting to Rising Sea Levels in San Francisco Bay: The Potential for Thin Layer Sediment Application to Enhance Tidal Marsh Resiliency through This Century
… tidal marsh habitat with a thin layer of dredge sediment via high-pressure spray disposal within San Francisco Bay. This adaptation strategy is then analyzed for potential integration into the Bay’s long term management plan for dredge material disposal. The Marsh Equilibrium Model …
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Composição, distribuição espaço - temporal e associações de espécies de Gastropoda do infralitoral de fundos inconsolidados da região do Cabo Frio, RJ, Brasil
… were done using an otter-trawl, a rectangular dredge and a van Veen grab at 30, 45 and 60 meters deep, during 1986 to 1988. Some abiotic parameters of the sediment and water near the bottom were analysed. More than 50% of the samples presented water temperatura below 18°C, showing a strong …
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The use of geophysical methods for dam seepage investigations and dredged oyster deposit characterization
… tools in earthfill dam investigations and dredged oyster bed characterization.</p><p>In the first paper, an earthfill dam in Warren County, Missouri was effectively investigated for seepage through the dam and its outlet works using an integration of the electrical resistivity tomography, …
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Distribuição espacial dos moluscos bivalves na região da plataforma continental do Cabo Frio, Praia de Maçambaba, Estado do Rio de Janeiro, Brasil
… 1987, using a Van-Veen grab, a rectangular dredge and a otter trawl. Forty five species were identified belonging to 29 families. The spatial distribution at 30, 45 and 60 metres of depth was determined by classification and ordination analysis. The distribution paterns were compared with …
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Keanekaragaman muluska di perairan Pantai Lekok Kabupaten Pasuruan
… masing-masing perairan dengan menggunakan Ekman Dredge dan pengambilan secara langsung. Sampel diidentifikasi di Laboratorium Ekologi Jurusan Biologi, Fakultas Sains dan Teknologi, Universitas Islam Negeri Maulana Malik Ibrahim Malang. Hasil penelitian moluska di perairan Pantai Lekok Kabupaten …
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Mitigation Strategies for Developed Areas of Galveston Bay
… human impacts affecting wetlands, dredging and dredge-related activities are perhaps the most significant (Salveson, 1990). This study analyzes and evaluates mitigation strategies for managing wetlands influenced by dredging activities associated with development. Additionally, the study yields …
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