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Full-Text Articles in Engineering
High-Resolution Timeseries Analysis Of Dynamic Geochemistry: A 27-Well Survey Of Contaminated Groundwater Downstream Of The Former S-3 Ponds, Oak Ridge, Tennessee, Emma Dixon
Masters Theses
Spatiotemporal variability of geochemistry of contaminated groundwater has large implications on overall water quality and ability to respond to remedial applications. Gaining knowledge of how geochemistry changes over time in an area can help establish response trends to changing external conditions like weather and level of contamination. In this study, a spatiotemporal survey was performed on 27 wells at the Y-12 Complex in Oak Ridge, Tennessee. This was completed to measure diurnal fluxes in geochemistry from seasonal changes and extreme weather conditions in three areas of historically different contamination levels from a single point contamination source. Measurements were gathered over …
Lagrangian Bedload Movement Prediction Using The Virtual Velocity Approach, Theodoros Kyriakopoulos
Lagrangian Bedload Movement Prediction Using The Virtual Velocity Approach, Theodoros Kyriakopoulos
Masters Theses
The advances in particle tracking codes in the recent years has made possible to track the intermittent movement of a large number of sediment particles with precision and in an automated way. The present study used this technique to study the velocity of the particle while it is in motion, the length it travels once it gets mobilized until it deposits, and the time it rests once deposited until it gets mobilized again. New modeling equations were developed to predict these quantities for a wide range of flow conditions and sediment sizes. These equations were combined to predict the virtual …
Improving Stream Bank Erosion Estimates By Adjusting The Applied Shear Stress For Different Bank Characteristics, Justin Condon
Improving Stream Bank Erosion Estimates By Adjusting The Applied Shear Stress For Different Bank Characteristics, Justin Condon
Masters Theses
Stream bank erosion rates are commonly modeled using the excess shear stress equation εr = kd(τ-τc)a, where the exponent a is assumed to be unity. The coefficient of erodibility kd, and the critical shear stress τc [Tau c] are properties of the bank soil and the applied shear stress τ [Tau] is a function of the channel geometry and discharge. This equation appears to overstimate bank erosion likely due to effects of channel morphology and bank vegetation, among other factors. The objective of this study was to determine whether …