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 36 for “"trenching"”.
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A comparative study of trenchless technologies versus traditional open trenching for the replacement of ageing potable water pipelines
Submitted in fulfilment of the requirements of the Degree of Magister Technologiae: Civil Engineering, Durban University of Technology, Durban, South Africa, 2013.
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Detection of a Landslide Glide Plane Using Seismic Reflection Methods: Investigation at Little Valley Landslide in Draper, Utah
… of a portion of the Little Valley Landslide. Trenching and drilling identified landslide material in the subsurface. The high-resolution seismic reflection data imaged the glide surface with the onset of coherent reflectivity. A decollement or glide surface underlies the landslide indicating a …
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Burnt Rock Mound (26Ck3601): Late Archaic and Ceramic period human use of a northern Mojave spring mound
Archaeological excavations and geological trenching at Burnt Rock Spring Mound, 26CK3601, in the northern Mojave Desert has revealed a complex relationship between paleohydrogeology and the prehistoric human use of the site. Multiple formation, accumulation, and deflation episodes since the Late …
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Stream piracy and glacial diversion of Little Missouri River, North Dakota
… Medicine Stone River. This was followed by deep trenching of the newly established valley.</p> <p>Stage No. 4 – This marks the beginning of continental glaciation and alluviation of the previously entrenched channel.</p> <p>Stage No. 5 – Maximum glaciation was followed by re-trenching of the …
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Archaeological evaluation, land use and development: an application of decision analysis to current practices within local government development control processes.
… and date of archaeological features. Even Trial Trenching, the most effective technique, can only produce good Performance Scores for the i, dentification of feature types on less than 32% of the Case Study sites. Statistical Analysis of Trenching methodologies shows that an increase to at least …
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Determining the potential drivers of invasive C4 grasses at De Hoop Nature Reserve, South Africa
… I removed competition for resources by trenching and inserting a plastic sheath around each grass tuft to a depth of 500 mm. My results show an increase in mortality in drier treatments at the top of the slope. Trenching and fertiliser addition had significant positive effects on grass …
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Investigation of the critical specific gravity for cables and pipelines during various backfilling and installation processes
… can be achieved using either ploughing or jet trenching with remotely operated vehicles.<br/><br/>In this thesis the issues arising while embedding pipelines and cables using jet trenching and backfill ploughing were investigated by means of scaled physical model tests. The purpose of the …
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Earthquakes in complex fault settings: Examples from the Oregon Cascades, Eastern California Shear Zone, and San Andreas fault
… new Quaternary faults and conducted paleoseismic trenching, where I found evidence for a mid-late Holocene earthquake on the Twin Lakes maar fault. I suggest that tectonics and not volcanism is responsible for the most recent deformation in the region based on fault geometries and earthquake …
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Overtrawlability and Mechanical Damage of Pipe-in-Pipe
… has the potential to eliminate the need for trenching in areas of high fishing activity and can therefore have considerable economic benefits. The objective of this research is to develop the methods to estimate the overtrawlability of pipe-in-pipes, meanwhile review the existing methods for …
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Soil thermal properties and heat loss from buried pipes
… be desirable or necessary to limit the depth of trenching and provide a means of maintaining the pipe temperature above freezing; various means are available such as insulation, electric heaters, and recirculation. Proper application and use of these heating methods requires a knowledge of the …
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Review of the mechanical properties of lunar soils
… and core samples returned to earth, as well as trenching, penetration and simple geophysical experiments performed during the five successful Apollo missions to the moon. Most of this data corresponds to material in the upper 1 to 3 m of the lunar surface. Lunar regolith is comprised of a …
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Imperfect upheaval subsea pipeline buckling
… practice, including the particular employment of trenching and/or burial for purposes of protection. Novel, small scale, full thermo-mechanical system testing is presented, the design and construction of the actual experimental set-up being a key feature of the research programme. Subsidiary …
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The performance of pipeline ploughs
… design procedures modified which may allow trenching contractors to make better predictions of plough performance in sands.
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Sedimentological Characteristics and 3-D Internal Architecture of Washover Deposits from Hurricanes Frances, Ivan, and Jeanne
… washover deposits were studied through coring, trenching, sediment analysis, ground penetrating radar (GPR) surveys, and pre- and post-storm aerial photography and LiDAR topographic survey data. The cross-shore extent of washover deposition is controlled by sediment supply, accommodation space, …
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Characterization of fluvial facies distributions and cyclicity using terrestrial lidar: Paleocene Nacimiento Formation, Kutz Canyon, New Mexico
… lobe switching on a distributive fluvial system. Trenching through the weathering crust present on outcrop along two measured stratigraphic sections indicated that while gross lithology can be determined from the lidar intensity data, small-scale textural details cannot. As a result, a …
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Ravine alluvial fans as records of landscape change in the Le Sueur River Basin, southern Minnesota
… fan surfaces also marks post-settlement changes. Trenching and tile drainage on the uplands allowed for greater transport of water down ravines and onto fans. These results confirm land use change triggered an increase in upstream erosion and fan deposition followed by incision on short time …
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Paleoseismology and Archaeoseismology along the Southern Dead Sea Transform in Wadi 'Arabah Near the municipality of Aqaba, Jordan
… previously understood. In Taba, paleoseismic trenching data suggests that between two to four earthquakes ruptured the sabkha from the 8th to the 16th centuries, although a three-event model is preferred. When correlated with major earthquake catalogs, these ruptures likely represent the A.D. …
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The geomorphological behaviour of a snow-fed, semi-arid gully system in western Colorado
… the sort of lodged sediments normally prone to trenching will not survive the snowmelt flushing on the main channel, there are possibilities for network Integration through fans on 'summer-sensitive' parts of the watershed. These possibilities and the large negative sediment yield budget …
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Surface Offset and Slip Rates for the Winter Rim Fault System in the Summer Lake Basin, Oregon
… obtaining slip rates through means other than trenching.
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