Civil and Environmental Engineering Commons^™

Classification Of Marl Soils, Chulmin Jung, Sochan Jung, Antonio Bobet, Nayyar Zia Siddiki

JTRP Technical Reports

Field and laboratory tests were conducted to investigate the degree of uniformity and quality that is obtained with chemical treatment of the subgrade with LKD using current construction techniques. An INDOT road project under construction was selected for the research. A 140-m long subgrade section was chemically treated with LKD with a target thickness of 16 inches, which is the current standard practice, while another 140-m long section was treated with a target thickness of 14 inches. DCP tests were done at each section to obtain the stiffness (or strength) of the chemically-treated and natural (untreated) subgrade soil layers. LWD …

Field Investigation Of Subgrade Lime Modification, Chulmin Jung, Sochan Jung, Antonio Bobet, Nayyar Zia Siddiki

JTRP Technical Reports

No abstract provided.

Particle Resuspension In The Columbia River Plume Near Field, Emily Y. Spahn, Alexander R. Horner-Devine, Jonathan Nash, David A. Jay, Levi Kilcher

Civil and Environmental Engineering Faculty Publications and Presentations

Measurements of suspended sediment concentration, velocity, salinity, and turbulent microscale shear in the near-field region of the Columbia River plume are used to investigate the mechanisms of sediment resuspension and entrainment into the plume. An east-west transect was occupied during spring and neap tide periods in August 2005 and May 2006, corresponding to low and high river discharge conditions, respectively. During the high-discharge period the plume is decoupled from the bottom, and fine sediment resuspended from the bottom does not leave the benthic boundary layer. The primary modes of sediment transport associated with the plume are advection of sediment from …

Seismic Vulnerability Of Oregon State Highway Bridges: Mitigation Strategies To Reduce Major Mobility Risks, Albert Nako, Craig Shike, Jan Six, Bruce Johnson, Peter Dusicka, Selamawit Tesfayesus Mehary

Civil and Environmental Engineering Faculty Publications and Presentations

The Oregon Department of Transportation and Portland State University evaluated the seismic vulnerability of state highway bridges in western Oregon. The study used a computer program called REDARS2 that simulated the damage to bridges within a transportation network. It predicted ground motions for a specific location and magnitude of earthquake, resulting bridge damage and the cost of the damage, as well as the cost to the public for traffic delays due to detours around damaged bridges. Estimated damage and delay costs were presented for major highways in the region.

Steel Sheet Sheathing Options For Cold-Formed Steel Framed Shear Wall Assemblies Providing Shear Resistance - Phase 2, Cheng Yu, Yujie Chen

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

The North American Standard for Cold-Formed Steel Framing - Lateral Design, AISI S213-07, provides design provisions for cold-formed steel framed shear walls with steel sheet sheathing. However, options are limited to 18-mil and 27-mil steel sheet sheathing. Phase 1 of this project was successfully completed and a final report, Steel Sheet Sheathing Options for Cold-Formed Steel Framed Shear Wall Assemblies Providing Shear Resistance, dated October 31, 2007 has been issued. The primary objective of Phase 1 was to add values to AISI S213 for 30-mil and 33-mil sheet steel shear walls with 2:1 and 4:1 aspect ratios and 6”, 4”, …

Modeling Soil Depth From Topographic And Land Cover Attributes, Teklu K. Tesfa, David G. Tarboton, David G. Chandler, James P. Mcnamara

Civil and Environmental Engineering Faculty Publications

Soil depth is an important input parameter in hydrological and ecological modeling. Presently, the soil depth data available in national soil databases (STATSGO and SSURGO) from the Natural Resources Conservation Service are provided as averages within generalized land units (map units). Spatial uncertainty within these units limits their applicability for distributed modeling in complex terrain. This work reports statistical models for prediction of soil depth in a semiarid mountainous watershed that are based upon the relationship between soil depth and topographic and land cover attributes. Soil depth was surveyed by driving a rod into the ground until refusal at locations …

Use Of In-Planta Solid Phase Sampling Devices To Delineate Voc Plumes, Joel Gerard Burken, Kendra Waltermire, Emily Sheehan

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Plants Directly Interact with Surrounding Water, Air, and Soil, Collecting and Storing Chemicals and Elements from the Surrounding Environment. Two New and Innovative Sampling Methods in Which This Valuable Data Can Be Accessed to Replace as Well as Supplement Contaminated-Site Investigations Have Been Developed. When Determining the Extent of the Plume on a Contaminated Site, Groundwater Sampling May Be Limited Due to Time, Site Access, and Expense. by using New Techniques that Place Sampling Devices Inside the Trees on Site, We Can Sample Trees Naturally Occurring on a Contaminated Site or Those Planted in Phytoremediation or Redevelopment Efforts, Evaluate the …

Simulations Of Aquaculture Dissolved Waste Transport And Mixing In Near-Coastal Waters, S. K. Venayagamoorthy, O. B. Fringer, J. R. Koseff, R. L. Naylor

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The present study focuses on understanding the transport and fate of dissolved waste from aquaculture pens in near-coastal environments using the hydrodynamic code SUNTANS, which employs unstructured grids to compute flows at very high resolution. We perform simulations of the dissolved waste field and study the effects of different flow conditions (tides and currents) on the evolution of the waste plume. The fish pen causes partial blockage of the flow, leading to the deceleration of the approaching flow and the formation of a downstream wake. Results of the concentration field for an oscillatory flow condition superimposed on a mean current …

Agenda: World Energy Justice Conference And Appropriate Technology Arcade, University Of Colorado Boulder. Center For Energy & Environmental Security, University Of Colorado Boulder. School Of Law

World Energy Justice Conference (October 23-24)

The 2009 CEES Energy Justice Conference took place at the University of Colorado Law School on October 23rd and 24th, 2009. It featured 11 sessions, more than 40 speakers, and attracted over 200 attendees. The Conference brought together leading international and U.S. decision-makers in politics, engineering, public health, law, business, economics, and innovators in the sciences to explore how best to address the critical needs of the energy-oppressed poor (EOP) through long-term interdisciplinary action, information sharing, and deployment of appropriate sustainable energy technologies (ASETs).

The Colorado Journal of International Environmental Law & Policy (CJIELP) at the University of Colorado Law …

An Overview Of The Odot Safety Investigations Manual, Christopher M. Monsere, Karen Dixon

Civil and Environmental Engineering Faculty Publications and Presentations

This presentation provides an overview of the ODOT Safety Investigations Manual. The objective of this manual is to function as a resource that will assist ODOT traffic investigators with highway safety project screening and evaluations.

East Bay Energy Consortium Budget Committee Meeting Minutes, October 19, 2009, East Bay Energy Consortium

East Bay Energy Consortium Meeting Minutes

No abstract provided.

East Bay Energy Consortium Legal Committee Meeting Minutes, October 19, 2009, East Bay Energy Consortium Legal Committee

East Bay Energy Consortium Meeting Minutes

No abstract provided.

Sensitivity Analysis And Calibration Of The Alligator Cracking Model In The Mechanistic-Empirical Pavement Design Guide Using Regional Data, Vivek Jha

Theses and Dissertations

The models used in the mechanistic-empirical pavement design guide (M-EPDG) were calibrated using the data from all across the United States. The alligator cracking model uses traffic, material and structural data along with local and global calibration factors to calculate the number of axles to failure and the damage index. Both of which are further used to calculate the fatigue cracking in the pavement with the help of regression coefficients and calibration constants. However, as these coefficients and constants were developed using the national database, the model might not predict the fatigue behavior of the pavement accurately for a particular …

Agenda: Best Practices For Community And Environmental Protection, University Of Colorado Boulder. Natural Resources Law Center. Intermountain Oil And Gas Bmp Project, Colorado. Oil And Gas Conservation Commission

Best Practices for Community and Environmental Protection (October 14)

The first Intermountain BMP Project workshop, sponsored by the Natural Resources Law Center and the Colorado Oil and Gas Conservation Commission, was held in Rifle, Colorado on October 14, 2009 at the Garfield County Fairground for over 170 participants.

Speakers from Federal, state and local governments, the community, industry and environmental consultants, and conservation groups focused presentations and discussion on a greater understanding of what Best Management Practices (BMPs) are appropriate to the western slope of Colorado and how they are integrated into developments.

Slides: Best Management Practices: Planning, Leasing, Permitting, Jamie Connell

Best Practices for Community and Environmental Protection (October 14)

Presenter: Jamie Connell, Northwest Colorado District Manager, U.S. Bureau of Land Management (BLM) Colorado

23 slides

Slides: Disappearing Roads--An Efd Project: An Exploration Into Low Impact And Efficient Gas Field Drilling, Charles Dolan

Best Practices for Community and Environmental Protection (October 14)

Presenter: Rich Haut, Houston Advanced Research Center (HARC), for Dr. Charles Dolan, University of Wyoming, Environmentally Friendly Drilling Program

25 slides

Slides: Environmentally Friendly Drilling Systems Program (Efd), Rich Haut

Best Practices for Community and Environmental Protection (October 14)

Presenter: Rich Haut, Houston Advanced Research Center

23 slides

Slides: Innovative Best Practices For The Western Slope: Stormwater Management Solutions And Philosophy For The Oil And Gas Industry, Kyle N. Schildt

Best Practices for Community and Environmental Protection (October 14)

Presenter: Kyle N. Schildt, P.E., LT Environmental, Inc.

12 slides

Slides: Rifle, Silt, New Castle Community Development Plan: A Collaborative Planning Approach To Natural Gas Development, Peggy Utesch

Best Practices for Community and Environmental Protection (October 14)

Presenter: Peggy Utesch, Movin' Forward Consulting

25 slides

Slides: Bmp Project, Kent Kuster

Best Practices for Community and Environmental Protection (October 14)

Presenter: Kent Kuster, Consultation Coordinator, Colorado Department of Public Health and Environment (CDPHE)

17 slides

Slides: Comprehensive Drilling Plans, Dave Neslin

Best Practices for Community and Environmental Protection (October 14)

Presenter: Dave Neslin, Director, Colorado OIl and Gas Conservation Commission (COGCC)

8 slides

Nutrient Removal & Greenhouse Gas Abatement With Co2 Supplemented Algal High Rate Ponds, Ian Woertz, Laura Fulton, Tryg Lundquist

Civil and Environmental Engineering

High rate algae ponds fed clarified domestic wastewater and CO₂-rich flue gas are expected to remove nutrients to concentrations similar to those achieved in mechanical treatment technologies, such as activated sludge. However, the energy intensity of wastewater treatment with CO₂-supplemented high rate ponds (HRPs) would be less than that of mechanical treatments. In conjunction with anaerobic digestion of algal biomass and co-substrates, the algae-based system would produce a substantial excess of electricity. Greenhouse gas abatement from such CO₂-HRP/digestion systems would stem mainly from energy conservation and the offset of fossil fuel electricity with biogas-derived …

Biogas Production From Algae Biomass Harvested At Wastewater Treatment Ponds, Michael Salerno, Yakup Nurdogan, Tryg J. Lundquist

Civil and Environmental Engineering

Waste-grown microalgae are a potentially important biomass for biofuel production. However, most of the 7,000 wastewater treatment ponds systems in the US do not use algae harvesting. Those that do, typically return the biomass to the ponds, where it decomposes on the pond floor, releasing methane to the atmosphere and degrading water quality. Instead, the algae biomass could be processed in anaerobic digesters. Algae typically yield less methane than wastewater sludge (~0.3 vs. 0.40 L CH4/g volatile solids introduced). Ammonia toxicity and recalcitrant cell walls are commonly cited causes of the lower yields. Ammonia toxicity might be counteracted by co-digesting …

East Bay Energy Consortium Meeting Minutes, October 5, 2009, East Bay Energy Consortium

East Bay Energy Consortium Meeting Minutes

No abstract provided.

Ole Miss Engineer 2009

Ole Miss Engineer

No abstract provided.

Structural Assessment Of Highway "N" Power Substation Under Earthquake Loads, Genda Chen, Dongming Yan, Zuocai Wang, Seth Justin, J. David Rogers, Kazi Rezaul Karim

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

In this study, the Highway N Substation was analyzed with a finite element model (FEM) for its vulnerability. The 'rigid' bus and electric switch components were characterized with full scale shake table tests. Each component of the substation was carefully modeled with due considerations of mass density, stiffness and geometries. Based on the FEM, modal analysis was conducted to identify the natural frequencies of the structure along with their corresponding mass participation factors. In response spectrum and time history analyses, the dynamic responses of main components, such as 'rigid' buses and switches, were evaluated. The magnitude and location of the …

Performance Limits For 6-In. High Curbs Placed In Advance Of The Mgs Using Mash Vehicles Part:Ii Full-Scale Crash Testing, Karla A. Lechtenberg, Ronald K. Faller, Dean L. Sicking, Robert W. Bielenberg M.S.C.E., E.I.T., Jeffery C. Thiele, John D. Reid

Nebraska Department of Transportation: Research Reports

No abstract provided.

Behavior And Design Of Buried Concrete Pipes Phase Ii, Ece Erdogmus, Maher K. Tadros

Nebraska Department of Transportation: Research Reports

No abstract provided.

Termination And Anchorage Of Temporary Concrete Barriers, Scott Rosenbaugh, Robert W. Bielenberg, Ronald K. Faller, John R. Rohde, Dean L. Sicking, Karla A. Lechtenberg, James C. Holloway M.S.C.E., E.I.T., John D. Reid

Nebraska Department of Transportation: Research Reports

No abstract provided.

Bs News

Building Services Engineering

No abstract provided.