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

Civil and Environmental Engineering Commons

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

24960 Full-Text Articles 29693 Authors 7487189 Downloads 143 Institutions

All Articles in Civil and Environmental Engineering

Faceted Search

24960 full-text articles. Page 5 of 587.

Application Of Ahp Method For Mapping Slope Geomorphic Phenomena, Adrian GROZAVU, Cristian V. PATRICHE, Florin C. MIHAI 2017 Alexandru Ioan Cuza University

Application Of Ahp Method For Mapping Slope Geomorphic Phenomena, Adrian Grozavu, Cristian V. Patriche, Florin C. Mihai

Florin C MIHAI

Landslides are common and frequent geomorphic phenomena for the plateau regions in Romania having important consequences, especially economic ones, that needs designing scientific and technical plans for landslide risk mitigation. For this, an important preliminary step is assessing and mapping the landslide susceptibility. This paper examines a plateau zone in eastern Romania providing such a map, based on the
landslides inventory, the digital elevation model (DEM) and the thematic layers of several factors thought to be potential predictors of landslides occurrence: topographic features, land use, and lithology. The methodological framework is based on the analytical hierarchy process (AHP) principles and ...


Performance Metrics For Depth-Based Signal Separation Using Deep Vertical Line Arrays, Gabriel Paul Kniffin, John Kenneth Boyle, Lisa Zurk, Martin Siderius 2017 Portland State University

Performance Metrics For Depth-Based Signal Separation Using Deep Vertical Line Arrays, Gabriel Paul Kniffin, John Kenneth Boyle, Lisa Zurk, Martin Siderius

Lisa M. Zurk

A recent publication by McCargar and Zurk [(2013). J. Acoust. Soc. Am. 133(4), EL320–EL325] introduced a modified Fourier transform-based method for passive source depth estimation using vertical line arrays deployed below the critical depth in the deep ocean. This method utilizes the depth-dependent modulation caused by the interference between the direct and surface-reflected acoustic arrivals, the observation of which is enhanced by propagation through the reliable acoustic path. However, neither the performance of this method nor its limits of applicability have yet been thoroughly investigated. This paper addresses both of these issues; the first by identifying and analyzing ...


Free Vibrations Of Precast Modular Steel-Concrete Composite Railway Track Slabs, Stephen Kimindiri Kimani, Sakdirat Kaewunruen 2017 University of Birminham

Free Vibrations Of Precast Modular Steel-Concrete Composite Railway Track Slabs, Stephen Kimindiri Kimani, Sakdirat Kaewunruen

Sakdirat Kaewunruen


This paper highlights a study undertaken on the free vibration of a precast steel-concrete composite slab panel for track support. The steel-concrete composite slab track is an evolvement from the slab track, a form of ballastless track which is becoming increasingly attractive to asset owners as they seek to reduce lifecycle costs and deal with increasing rail traffic speeds. The slender nature of the slab panel due to its reduced depth of construction makes it susceptible to vibration problems. The aim of the study is driven by the need to address the limited research available to date on the dynamic ...


Bim Innovation Capability Programme Of Ireland, Barry McAuley, Alan Hore, Roger West 2017 Dublin Institute of Technology

Bim Innovation Capability Programme Of Ireland, Barry Mcauley, Alan Hore, Roger West

Conference papers

The Irish Government has requested that Enterprise Ireland, an organisation responsible for the development and growth of Irish enterprises in world markets to actively promote the use of BIM in Ireland. This promotion has taken the form of an opportunity for Enterprise Ireland clients to apply for a grant under their BIM Enable and BIM Implementation schemes and also through their funding of the BIM Innovation Capability Programme (BICP) of Ireland. The BICP is a two-year project (2016-2018) which seeks to capture the capability of the Irish Construction Industry and the Higher Education Institutes to respond to the increased requirement ...


Case Study: The Influence Of Oil-Based Friction Modifier Quantity On Tram Braking Distance And Noise, Rondos Galas, Milan Omasta, Martin Klapka, Sakdirat Kaewunruen, Ivan Krupka, Martin Hartl 2017 Brno University of Technology

Case Study: The Influence Of Oil-Based Friction Modifier Quantity On Tram Braking Distance And Noise, Rondos Galas, Milan Omasta, Martin Klapka, Sakdirat Kaewunruen, Ivan Krupka, Martin Hartl

Sakdirat Kaewunruen

In the present study, the twin disc machine and the light rail system was employed in order to investigate the ability of oil-based friction modifier (FM) to optimize adhesion and to reduce noise. The risks associated with poor adhesion conditions after the application of FM were evaluated. Both laboratory and field experiments showed that if the contact is overdosed by FM, the poor adhesion, which results in the extension of braking distance, can occur. In contrast, the smaller quantities do not cause critical adhesion but the effect of FM on the noise reduction is negligible. This study indicates that it ...


Book Review - Dixie Highway: Road Building And The Making Of The Modern South, 1900-1930, Rebecca Rose 2017 University of North Georgia

Book Review - Dixie Highway: Road Building And The Making Of The Modern South, 1900-1930, Rebecca Rose

Georgia Library Quarterly

No abstract provided.


Benchmarking The Energy Intensity Of Small Nebraska Wastewater Treatment Plants, Steven M. Hanna 2017 University of Nebraska-Lincoln

Benchmarking The Energy Intensity Of Small Nebraska Wastewater Treatment Plants, Steven M. Hanna

Environmental Engineering Theses and Graduate Student Research

To help small communities improve the energy efficiency of their wastewater treatment plants, this study created energy benchmarking models for small wastewater plants serving populations of 10,000 or less and having average flows less than 1.5 million gallons per day (MGD). The purpose of these models is to allow comparisons among plants of similar type and size, identify what factors most significantly impact energy usage, and predict potential savings from changes in key plant characteristics.

Energy usage and plant data from 83 small, mechanical wastewater plants in Nebraska were collected and used to create energy benchmarking models. Data ...


Broadening Understanding Of Roundabout Operation Analysis: Planning-Level Tools And Signal Application, Ahmed Buasali 2017 University of Nebraska-Lincoln

Broadening Understanding Of Roundabout Operation Analysis: Planning-Level Tools And Signal Application, Ahmed Buasali

Civil Engineering Theses, Dissertations, and Student Research

In United States, roundabouts have recently emerged as an effective and efficient alternative to conventional signalized intersections for the control of traffic at junctions. This thesis includes two investigations related to the operations of roundabouts.

The first investigation examines the ability of a planning-level tool (the critical sum method) to serve as an indicator variable for the results of the Highway Capacity Manual’s average delay per vehicle measure for a roundabout facility; to what extent do the results of one predict the results of the other? The critical sum method was found to accurately predict the HCM average delay ...


An Improved Method Of Arsenic (Iii) Removal By Reverse Osmosis Membrane, Yizhi Hou 2017 Marquette University

An Improved Method Of Arsenic (Iii) Removal By Reverse Osmosis Membrane, Yizhi Hou

Master's Theses (2009 -)

Arsenic is a Group 1 carcinogen as there is abundant research to support that ingestion of arsenic in drinking water and food can lead to liver, lung, kidney, or bladder cancer in humans. The recommend World Health Organization (WHO) arsenic standard in drinking water is 10 µg/L, while the Environmental Protection Agency's (EPA) Maximum Contaminant Level (MCL) of arsenic in drinking water is 10 µg/L. Globally, at least 40 million people face more than 10 µg/L arsenic contamination in their drinking water. As(III) (trivalent state, such as arsenite), and As(V) (pentavalent state, such as ...


Evaluation Of The Fertilization Properties Of Algal Biomass And Assessment Of Koh-Induced Flocculation Of Pw95 Algal Cells, Olakunle Ogunsakin 2017 Montana Tech

Evaluation Of The Fertilization Properties Of Algal Biomass And Assessment Of Koh-Induced Flocculation Of Pw95 Algal Cells, Olakunle Ogunsakin

Graduate Theses & Non-Theses

Microalgae from the Coal Bed Methane (CBM) ponds of the Powder River Basin (PRB) in Southeastern Montana have the potential to be utilized as fertilizer for use on the economically important plants of Montana. Three very important economic field crops of Montana (winter wheat - Triticum aestivum, potato - Solanum tuberosum, and flax - Linum usitatissimum) were used for the fertilization experiments. Isolates of unicellular green algae - PW95 (sequenced as Neospongiococcum sp.) from the CBM ponds, and blue-green microalgae – Cyanobacteria (Anabaena Cylindrica) were cultured in the laboratory and the cells were concentrated using gravity sedimentation. Nutrient analysis of the PW95 cultures showed nitrogen ...


The Prevalence Of Six Sigma Trends In The Construction Industry In Pakistan, Muhammad M. Hassan 2017 Western Kentucky University

The Prevalence Of Six Sigma Trends In The Construction Industry In Pakistan, Muhammad M. Hassan

Masters Theses & Specialist Projects

Economic development in any country or area depends heavily on the performance of the construction industry. This is because the subsequent development of infrastructure increases economic activity, living standards, direct foreign investments, and business opportunities. The construction industry in Pakistan also plays a significant role in its economic activity, and the government’s focus towards increasing infrastructure development provides the construction industry with growth prospects. It is observed that quality management practices in the Pakistan construction industry are highly inadequate to enhance quality. The construction industry there is highly challenged with inadequate delays in projects and project quality. The need ...


Proposal For Monitoring Concrete Painting As A Preventive Maintenance Tool (Abutments And Pier Caps), Danny Wells, Sudhir Palle, Theodore Hopwood II 2017 University of Kentucky

Proposal For Monitoring Concrete Painting As A Preventive Maintenance Tool (Abutments And Pier Caps), Danny Wells, Sudhir Palle, Theodore Hopwood Ii

Kentucky Transportation Center Technical Assistance Report

One of the growing number of preventive bridge maintenance activities conducted by the Kentucky Transportation Cabinet (KYTC) is washing and applying thin film protective coatings to bridge abutments and piers. Previous work conducted by Kentucky Transportation Center (KTC) under KYSPR 10-406 documented increased chloride contamination of these bridge components and the need for protective coatings. KYTC Contract ID 162952 includes, among other tasks, cleaning and coating specific concrete elements of eighteen bridges in Anderson and Woodford counties (District 7). These elements are interior faces of the barrier walls, pier caps, and abutment seats. The contract was let on July 29 ...


Proposed Testing Of Concrete Sealers, Danny Wells, Sudhir Palle, Theodore Hopwood II 2017 University of Kentucky

Proposed Testing Of Concrete Sealers, Danny Wells, Sudhir Palle, Theodore Hopwood Ii

Kentucky Transportation Center Technical Assistance Report

Chlorides, in sufficient concentrations, will cause corrosion of steel reinforcement in bridge decks. Previous studies have shown that de-icing chemicals and practices used by the Kentucky Transportation Cabinet (KYTC) can result in problematic levels of chloride at steel reinforcing depths in a relatively short amount of time. With the advent of liquid applied pre-treatment deicing chemicals, testing performed in Kentucky indicate chloride levels in bridge decks at a depth of two inches have increased significantly.

Chlorides, in sufficient concentrations, will cause corrosion of steel reinforcement in bridge decks. Previous studies have shown that de-icing chemicals and practices used by the ...


Time Varying Parameter Models For Catchments With Land Use Change: The Importance Of Model Structure, Sahani Pathiraja, Daniela Anghileri, Paolo Burlando, Ashish Sharma, Lucy Marshall, Hamid Moradkhani 2017 University of New South Wales

Time Varying Parameter Models For Catchments With Land Use Change: The Importance Of Model Structure, Sahani Pathiraja, Daniela Anghileri, Paolo Burlando, Ashish Sharma, Lucy Marshall, Hamid Moradkhani

Civil and Environmental Engineering Faculty Publications and Presentations

Rapid population and economic growth in South-East-Asia has been accompanied by extensive land use change with consequent impacts on catchment hydrology. Modelling methodologies capable of handling changing land use conditions are therefore becoming ever more important, and are receiving increasing attention from hydrologists. A recently developed Data Assimilation based framework that allows model parameters to vary through time in response to signals of change in observations is considered for a medium sized catchment (2880 km²) in Northern Vietnam experiencing substantial but gradual land cover change. We investigate the efficacy of the method as well as the importance of the chosen ...


Development And Application Of Hydraulic And Hydrogeologic Models To Better Inform Management Decisions, Trinity L. Stout 2017 Utah State University

Development And Application Of Hydraulic And Hydrogeologic Models To Better Inform Management Decisions, Trinity L. Stout

All Graduate Theses and Dissertations

Water is one of the most important and limited resources in regions with little rainfall. As populations continue to grow, so does the need for water. Individuals in water management positions need to be well informed in order to avoid potential negative effects concerning the overall quality and amount of water available for both people and the environment. In order to provide better information for these individuals, computer models and mathematical relationships are commonly developed to estimate the outcome of different situations regarding surface water and groundwater. Along these lines, this study focused on two modeling studies that provide information ...


Resolving Spatial And Temporal Variability In Dissolved Organic Matter Characteristics Within Combined Agricultural And Stormwater Conveyances, Bryce A. Mihalevich 2017 Utah State University

Resolving Spatial And Temporal Variability In Dissolved Organic Matter Characteristics Within Combined Agricultural And Stormwater Conveyances, Bryce A. Mihalevich

All Graduate Theses and Dissertations

In many urban areas, stormwater runoff can threaten the ecological health of streams and downstream water bodies. Due to the increased impervious nature of urban landscapes, runoff is more “flashy” and as a result, high concentrations of pollutants can be transported in shorter periods of time than in more natural environments. One pollutant of concern is dissolved organic matter (DOM). DOM is important within aquatic ecosystems, but excess amounts can cause depletion in dissolved oxygen concentrations and can negatively affect aquatic organisms. This study investigated changes in DOM quantity and sources within the Northwest Field Canal (NWFC), an urban water ...


Blending And Mixed Variational Principles To Overcome Locking Phenomena In Isogeometric Beams, Kyle Dennis Richardson 2017 Brigham Young University

Blending And Mixed Variational Principles To Overcome Locking Phenomena In Isogeometric Beams, Kyle Dennis Richardson

All Theses and Dissertations

Two methods for overcoming locking phenomena in isogeometric beams are presented. The first method blends the rotation of a Timoshenko beam with the rotation of a Bernoulli beam to produce realistic displacements in straight beams. The second method uses mixed variational principles, specifically the Hu-Washizu Principle, to produce realistic displacements as well as realistic strains without post-processing.


Trace Metals In Stormwater: Alternative Best Management Practices, Jennifer Ibeth Mora 2017 Portland State University

Trace Metals In Stormwater: Alternative Best Management Practices, Jennifer Ibeth Mora

Civil and Environmental Engineering Master's Project Reports

Heavy metals, such as copper (Cu) and zinc (Zn), are considered hazardous in natural waters due to their toxicity and non-biodegradability. The focus of this study is to use batch experiments to investigate the heavy metal (Cu and Zn) removal efficiency of perlite and EarthliteTM to improve in-situ filtration systems for stormwater catchment basins. Stormwater samples from two field sites in Portland, OR, chosen to represent a high-use commercial site and high-traffic urban road, were characterized to inform experimental design and compare to values found in literature. The Linear, Freundlich, and Langmuir isotherm models were used to describe equilibrium ...


Laser Doppler Velocimetry Using A Modified Computer Mouse, Edward D. Zaron 2017 Portland State University

Laser Doppler Velocimetry Using A Modified Computer Mouse, Edward D. Zaron

Edward D. Zaron

A computer mouse has been modified for use as a low-cost laser Doppler interferometer and used to measure the two-component fluid velocity of a flowing soap film. The mouse sensor contains two vertical cavity surface emitting lasers, photodiodes, and signal processing hardware integrated into a single package, approximately 1 cm2 in size, and interfaces to a host computer via a standard USB port. Using the principle of self-mixing interferometry, whereby laser light re-enters the laser cavity after being scattered from a moving target, the Doppler shift and velocity of scatterers dispersed in the flow are measured. Observations of the boundary ...


M2 Internal Tides And Their Observed Wavenumber Spectra From Satellite Altimetry, Richard D. Ray, Edward D. Zaron 2017 NASA Goddard Space Flight Center

M2 Internal Tides And Their Observed Wavenumber Spectra From Satellite Altimetry, Richard D. Ray, Edward D. Zaron

Edward D. Zaron

A near-global chart of surface elevations associated with the stationary M2 internal tide is empirically constructed from multimission satellite altimeter data. An advantage of a strictly empirical mapping approach is that results are independent of assumptions about ocean wave dynamics and, in fact, can be used to test such assumptions. A disadvantage is that present-day altimeter coverage is only marginally adequate to support mapping such short-wavelength features. Moreover, predominantly north–south ground-track orientations and contamination from nontidal oceanographic variability can lead to deficiencies in mapped tides. Independent data from Cryosphere Satellite-2 (CryoSat-2) and other altimeters are used to test ...


Digital Commons powered by bepress