Open Access. Powered by Scholars. Published by Universities.®

Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

Articles 1 - 7 of 7

Full-Text Articles in Engineering

Systems Approaches To Transdisciplinary Sustainable Development Issues, David Lawrence Zelinka Jan 2019

Systems Approaches To Transdisciplinary Sustainable Development Issues, David Lawrence Zelinka

Civil Engineering Graduate Theses & Dissertations

The goals of this dissertation are twofold. The first is to advance the discipline of sustainability science through the application of systems-based tools (primarily system dynamics) and civil engineering principles. Sustainability science is fundamental to implementing effective strategies for progressing sustainable development and improving human well-being around the planet, but it is still not fully developed as a science and needs new methods and approaches due to the field’s inherent interdisciplinarity and complexity. Civil engineering as a foundation provides mathematical knowledge, computer modeling skills, and a wide breadth of technical understanding, but it lacks the societal, political, and economic ...


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 ...


A Data-Driven Toolchain For The Operational Performance Analysis And Optimization Of Buildings, Anthony Reed Florita Jan 2019

A Data-Driven Toolchain For The Operational Performance Analysis And Optimization Of Buildings, Anthony Reed Florita

Civil Engineering Graduate Theses & Dissertations

Automation has proven indispensable to advancing human endeavors. Within the built environment its evolution and sophistication are on the cusp of moving beyond automatic control into automated prediction and diagnosis. A data-driven toolchain is developed so human efforts can be focused on high-value concerns. The research examines smart buildings as a cyberphysical construct and places the Bayesian perspective as paramount. Prior knowledge is leveraged through common building energy modeling and simulation tools, which are utilized and extended. An iterative, three-step process is developed to 1) classify building energy performance scenarios, 2) forecast dynamics over a planning horizon of interest, and ...


Strong Form Meshfree Collocation Method For Higher Order And Nonlinear Pdes In Engineering Applications, Andrew Christian Beel Jan 2019

Strong Form Meshfree Collocation Method For Higher Order And Nonlinear Pdes In Engineering Applications, Andrew Christian Beel

Civil Engineering Graduate Theses & Dissertations

The strong form meshfree collocation method based on Taylor approximation and moving least squares is an alternative to finite element methods for solving partial differential equations in engineering applications. This study examines how the proposed alternative method solves (i) higher-order and (ii) nonlinear partial differential equations. First, the proposed method is formulated in Chapter 2 for the general discretization and solution of strong forms of partial differential equations. Chapter 3 presents the convergence and error behavior of the proposed method for the fourth-order Stommel-Munk equation for wind-driven ocean circulation, as well as the numerical solution of this equation on a ...


Diagnosing Drivers Of Reservoir Sedimentation In The Western Us: A Case Study Of Prineville Reservoir, Oregon, Leah Clare Bensching Jan 2019

Diagnosing Drivers Of Reservoir Sedimentation In The Western Us: A Case Study Of Prineville Reservoir, Oregon, Leah Clare Bensching

Civil Engineering Graduate Theses & Dissertations

There is great need to quantify reservoir storage loss due to sediment. Less than 1% of reservoirs in the US have more than one volume survey. Due to the lack of frequent data collection, a constant rate sediment yield from year to year is often assumed. This study aims to explore the following questions: 1) Can hydrologically-forced sediment algorithms help us advance reservoir sedimentation estimates to improve future planning? 2) To which processes and inputs are reservoir sedimentation estimates most sensitive? 3) What can we learn from models that the linear sediment accumulation assumption fails to assess? It will address ...


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 ...