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Full-Text Articles in Engineering

How Much Does Stream-Groundwater Exchange Influence Whole-Stream Metabolism In A Small Mountain Stream?, Erin Elizabeth Jenkins Jan 2019

How Much Does Stream-Groundwater Exchange Influence Whole-Stream Metabolism In A Small Mountain Stream?, Erin Elizabeth Jenkins

Civil Engineering Graduate Theses & Dissertations

The open-channel oxygen method quantifies rates of gross primary productivity (GPP) and ecosystem respiration (ER) by employing the diel dissolved oxygen (DO) curve. This attributes stream metabolism to four processes: photosynthesis, oxidative respiration, reaeration, and groundwater flux. Groundwater flux, however, is often assumed to be negligible, which may introduce bias in estimates of metabolism. To investigate this, whole-stream metabolism and groundwater flux were measured in Como Creek, Colorado during the summer of 2018. Results from the BASE (Bayesian Single-station Estimation) metabolism model indicate that periods of anoxic groundwater input result in an overestimation of ER in baseline simulations. These data ...


Informing Many-Objective Decision-Making For Water Rights Allocations And Trading Dynamics Conditioned On A Streamflow Prediction Regime In The Elqui River Basin, Melissa A. Estep Jan 2019

Informing Many-Objective Decision-Making For Water Rights Allocations And Trading Dynamics Conditioned On A Streamflow Prediction Regime In The Elqui River Basin, Melissa A. Estep

Civil Engineering Graduate Theses & Dissertations

The Elqui Valley in northern Chile faces increasing water stress due to a growing agricultural sector. This study evaluates how improvements in season-ahead forecasting skill and changes in water rights trading dynamics impact the ability for seasonal reservoir management to meet the water needs of various actors in the basin. By establishing a baseline forecast of perfect foresight of observed streamflow data, the analysis evaluates how the use of an updated forecasting technique compares to climatology in its ability to meet management needs. Using the RiverWare river system modeling tool, multiple scenarios representing different suites of trade and reservoir operating ...


Centrifuge Modeling Of Dense Granular Columns In Layered Liquefiable Soils With Varying Stratigraphy And Overlying Structures, Mahir A. Badanagki Jan 2019

Centrifuge Modeling Of Dense Granular Columns In Layered Liquefiable Soils With Varying Stratigraphy And Overlying Structures, Mahir A. Badanagki

Civil Engineering Graduate Theses & Dissertations

Soil liquefaction and ground failure have been a major source of damage to slopes, embankments, and structures during previous earthquakes. The risk of liquefaction and associated ground deformations can be reduced by various forms of improvement, including the granular column technique. Granular columns are known to be cost effective and environmentally friendly, and they have been in use since the 1970’s to mitigate the liquefaction hazard. Granular columns mitigate the consequences of soil liquefaction through a combination of: 1) installation-induced ground densification, 2) increase in lateral effective stresses in the surrounding soil, 3) increase in shear stiffness, and 4 ...