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 92 for “"base level"”.
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Hillslope evolution in response to lateral base level migration
Hillslopes evolve in response to base level change, sediment production, and sediment transport. Many previous studies have focused on hillslopes undergoing vertical base level migration due to tectonic forcing and bedrock incision. Many geomorphic features, however, are characterized by lateral …
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An Analysis of Base-Level Conduit Sedimentation in South Central Kentucky
In karst basins, significant amounts of surface-derived sediment can enter into cave systems. The transport and deposition of these sediments in underground streams is a function of flow velocity, sediment supply and passage morphology. Changes in the surface environment can affect the water and …
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Complex retreat behavior in experimental barrier island response to base level rise
… and are susceptible to drowning from sea level rise. However, previous work suggests that barrier islands can retreat upslope to keep up with sea level rise and maintain their subaerial extent. To explore this idea, we performed physical experiments where barrier islands were subjected to …
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The transient response of bedrock river networks to sudden base level fall
… this thesis, theoretical, numerical, and field-based research techniques are utilized to study the initiation and distribution of knickpoints within fluvial networks. Field observations are derived from the Waipaoa River on the North Island of New Zealand. In the Waipaoa, 236 knickpoints …
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Measuring channel mobility through the analysis of area-based change in analog experiments, with insights into alluvial environments
… at the Saint Anthony Falls Laboratory, for area-based change in river-channel plan form with time. These experiments isolate the effects of (1) sediment input and deposition, (2) base-level, and (3) bank cohesion on channel mobility. (1) In experimental deltaic environments with aggradation and …
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Evolution of transient topography on passive margins: A study of landscape disequilibrium in the southern Appalachian Mountains
… of drainage rearrangement in producing local base level drop and subsequent basin-scale transient incision in the southern Appalachians. This process is fundamentally driven by the high potential energy of streams flowing across the elevated, slowly eroding Blue Ridge Plateau relative to the …
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Relationship of the Turtle, Forest, and Park rivers to the history of glacial Lake Agassiz
… Lake Agassiz was probably affected by changes in base level associated with fluctuations of that lake. The Turtle, Forest, and Park rivers, which presently flow eastward across the bed of Lake Agassiz, show little irrefutable evidence of base level fluctuations.</p> <p>Numerous terrace-like …
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Fluvial influence on high-frequency sedimentary cycle geometry: The transition from strandplain to deltaic deposition in the Cretaceous Point Lookout Sandstone, San Juan Basin, Colorado
… The onset of deltaic deposition is preceded by a base level fall and development of a Type 2 sequence boundary as evidenced by a basinward shift in shoreline facies expressed as distributary channel sandstones overlying shoreface deposits. Deposition in the study area, therefore, represents late …
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An investigation into the responses of the construction industry to preferential procurement in South Africa
The aim of this research is to establish a base level understanding of the influence of preferential procurement policies on construction firms with a view to contributing to theory development. The fundamental premise of this thesis is that preferential procurement polices are not neutral, but …
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Facies patterns and controls on sedimentation in the Triassic Chinle formation of Northeast New Mexico
… members are focussed upon. The concept of base level is helpful in realizing the time dependency of controls on sedimentation because allocyclic controls determine the position of base level and base level determines which autocyclic controls operate.
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Characterization of Lower Permian Carbonate Subaqueous Gravity Flows in Crockett County, Texas
… gravity flow deposits is used to interpret how base level fluctuations affect the type of deposits found on the slope and their effect on the deep basinal environment. This study utilizes core samples from the Wolfcamp Formation adjacent to the Central Basin Platform in five wells in Northwest …
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Project Management and Systems Engineering Framework for Educational Cubesat Missions
… cumbersome and often assume the student has a base-level understanding of project management and systems engineering fundamentals. A new universal project management and systems engineering framework was created and tailored specifically to the needs of an educational CubeSat mission. The …
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Determination of the location of the groundwater divide and nature of groundwater flow paths within a region of active stream capture; the New River watershed
… River (Prince et al., 2011). Difference in base level elevations between the lower Roanoke to the higher New River could be the source of potential energy driving rapid incision (Prince et al., 2011). Significant incongruities in base level elevations at the boundaries of an aquifer can …
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A Study of Beaver Pond Morphology and Site Characteristics After Disturbance in Eastern Glacier National Park, Montana
… when compared to different years. Varying lake levels because of irrigation draw-down at Lake Sherburne and Lower Two Medicine created a dynamic base level, whereas the local base level for the Saint Mary ponds remains relatively constant year round. The fluctuating base levels of Lower Two …
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Behavior-Genetic Analysis of the Black Blow Fly, Phormia Regina, Using the Central Excitatory State (Ces)
… the existence of water-induced CES (w-CES) and base-level water responsiveness. Furthermore, using replicated hybrid crosses between pure breeding lines, a single major-gene correlate of s-CES has been detected.
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Interactive agent generated architecture
… form generation through two behavior based artificial intelligence approaches: the communication of agents in an unpredictable simulation system, and the codification of information within an evolutionary process. Both concepts stem from the evaluation of potentially definable mental …
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Landscape forcing mechanisms on Quaternary timescales: The Tabernas Basin, SE Spain
… landform stratigraphy (i.e. basin wide terrace levels) for the Tabernas Basin. Chronological constraints for the Quaternary stratigraphy were obtained from Optically Stimulated Luminescence dating. Age estimations develop a pattern of climatically driven terrace aggradations during glacial …
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Estimativa do período de retorno de enchentes em postos fluviométricos, com curto período de observação
… the subject of this study. The approach used is based on the recent results on this problem, where the bivariate exponential probability distribution was used for the distribution of exceedences and the bivariate binomial probability distribution for the number of exceedences. The case when the …
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The Impact of the Defense Message System (DMS) on the United States Surface Navy
… primary link to the DMS will be provided by the Base Information Transfer System BITS which is the Navys plan for base-level communication system modernization. The BITS will network all units attached to the base and include a pierside interface for ships. An overview of the BITS system will be …
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Late Quaternary marine deposits, offshore central Texas: Processes controlling geometry, distribution, and preservation potential
… supply, accommodation space, and the rate of sea-level rise and fall, determine the thickness and overall extent of offshore deposits along the central Texas shelf. Analysis of near-shore sediment cores suggests that transgressive and highstand shorelines prograded during the Holocene. The …
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